Abstract:In order to provide the research of virtual prototype a complex 3-D virtual road environment, a 3-D FFT stochastic road model was established based on the single-point FFT model, and then the simulation result was gained by Matlab. What's more, based on the theory of triangle network, a general 3-D virtual road model with the arithmetic of nodes and elements was created. Then a specified 3-D virtual road file was imported into Adams to form the 3-D virtual road. Finally, a C-level virtual road was generated for the riding performance simulation of virtual vehicle. By comparing the simulation result with the GB/T 13441—92, the virtual vehicle's reasonable time under the ride performance requirement was obtained.

Abstract:Combined with the requirement of vehicles damper, two type of dampers were designed and manufactured by analyzing the two working pattern of MRF. The comparison between simulation and the experiment result shows that the difference of damp force is small in low speed and large in high speed. It is obvious that the performance of the mixed model is more excellent than the flow model. It has higher control rate and can reduce the jam of the damp hole in practice. It is certified that the magnetorheological fluid damper (MRD) model and the design idea and methods are correct and accord with the requirement of engineering.

Abstract:Accurate analysis of cooperating input and output performance of engine and torque converter is the essential of matching hydrodynamic transmission vehicle power system. Accurate calculation of cooperating point is the difficulty and key of cooperating input and output performance analysis of engine and torque converter. Least square higher order polynomial fit was adopted for engine net torque performance curve to get a precise result. At the same time, N equal division method, Newton's method and direct extraction of root were applied respectively to calculate the cooperating point of engine and torque converter. Matlab program language was used and three methods were testified by practical calculation and analysis. The calculating results show that three methods are all effective for the calculation of cooperating point of engine and torque converter.

Abstract:Based on the configuration feature and function demand of vehicle-borne line-of-sight (LOS) stabilization platform, a strap-down stabilization platform system was schemed. Combined with communication protocol between upper computer and lower computer of the stabilization platform control system, adopted the multithread and multimedia timer technology, an upper computer soft was compiled with visual C++, which was used to acquire and send gimbals position information real-time. To validate the real-time communication function of platform control system, the dynamic performance test was carried out. The results indicate that the real-time communication capability of stable platform control system satisfies employ requirements. 

Abstract:4个LIN网络。A dynamic scheduling algorithm for LIN message scheduling was proposed. Positive direction bus load and reverse direction bus load were presented for analysis the bus schedulability. The positive message has been treated as sporadic ones while reversed the periodic ones. System matrix was used to schedule the messages based on time slice. The good real time characteristics of the algorithm were achieved and the master node of the algorithm became more flexible. Experiment has been carried out and four real networks were designed by using the algorithm.

Abstract:Considering the characteristic of auto-body interior layout, the object-oriented case presentation models of auto-body interior layout were presented by employing the extended object model, in which the index and solution objects were appended. Constraints of auto-body interior layout were divided into three forms: domain, rule and formulation, and their definitions were described with object models. The nearest neighborhood method was adopted for case retrieval. The strategies for case adaptation, combining parameter substitution with constrain satisfaction, were presented to modify case solution. A test system was developed with UG and VC++, and the application shows the validity and feasibility of the presented method.

Abstract:36.95%。The driving modes of a parallel-series hybrid electric vehicle (HEV) were analyzed. The system efficiency models for the HEV at the charging and discharging mode were proposed based upon the engine efficiency map, motor/generator efficiency map and battery efficiency map. The optimization of energy management strategy for the hybrid system was studied, whose optimization target is the maximum of discharging efficiency at the discharging mode, and the maximum of charging efficiency, the maximum of charging efficiency and charging power at the charging mode with the different state of charge of battery, and the optimal control torque and speed for engine, motor and generator were obtained under the different driving conditions. The simulation of fuel economy shows that the decreasing ratio of fuel consumption of the hybrid system reaches 36.95%.

Abstract:Hydraulic confined piston engine (HCPE) integrates traditional internal combustion engine and hydraulic pump into one assembly, which can transform the thermal energy from fuel combustion into hydraulic energy, is a new type of flexible power device. The dynamic model of HCPE was constructed firstly, and then the energy input, dissipation, distribution and output under nominal working condition were simulated. During energy transformation, the loss related to combustion is 57.65%, friction related loss is 6.24%, hydraulic system related loss is 7.78%, effective power output is 26.87%, and the other loss is 1.46%. The curve of effective power ratio shows convexity shape along with increase of rotational speed or throttling.

Abstract:Multi-dimensional transient numerical simulation was done for induction, compression, combustion process of YD490ZL diesel engine by AVL_Fire. The gas flow, heat transfer in cylinder wall, fuel spray, particle formation and so on in different time of entire working process were analyzed for providing certain reference for optimization design of diesel engine cylinder. Combustion will be more sufficient and fuel economy will be higher if the relative distance between the center of combustion chamber and cylinder at X direction is adjusted. The heat transfer coefficient changes with the space position as well as time. The distribution of heat transfer coefficient and temperature at different time and position was provided by multi-dimensional transient calculation which provided the best boundary condition for finite element calculation. Intake swirl was formed obviously during the intake process; ring movement of gas flow in combustion chamber was still existed near the top dead center while it was influenced by squish flow.

Abstract:In order to meet the stage-Ⅳ emission standard in China, a electric control system based on EPR (electronic pressure regulator) for the lean-burn turbocharging heavy-duty automotive CNG engine was developed. The configuration and control principle of the CNG supply system, the intake management system and the ignition system were analyzed. By comparing with the multi-points injection system and single-point injection system, the principle and advantage of the EPR were analyzed. The Experiment indicates that the maximal power and the maximal torque of the CNG engine are close to those of the original diesel engine, and the emissions meet the stage-Ⅳ emission standard in China.

Abstract:Performance simulations of one diesel engine were conducted before and after power enhancement respectively, so the boundary conditions of temperature field simulation were obtained, then 3-D steady state thermal analysis of the cylinder head was conducted with FEA software. The effect on heat transfer between boiling water and cylinder head were taken into account. And the experiment of measuring cylinder head's steady state temperature was made on a one-cylinder diesel engine, the results of simulation and experiment were compared. The rule of setting fire-deck's boundary condition, the relation between steady state temperature and the duty, the difference of temperature field between one-cylinder engine and multi-cylinder engine were obtained respectively.

Abstract:98%。A Matlab program based on the discrete element method was developed to simulate the seeds motion in a 3-D vibrated seeder bed. The mechanical interactions force between seeds and also between seeds and the bed were modeled by linear springs, dash-pots and friction sliders. The cubic expansion coefficient, H, was calculated to describe the discrete distribution level of seeds. The simulation results show that, the seeds are separated effectively while the bed vibrated with high frequency and small amplitude, H increases with the increasing vibration strength, kv, and decreases with the seeds initial thickness, hs. The influences of friction coefficient and recovery coefficient on H were analyzed. The ideal active state was obtained at hs≈3.8 and kv=5.65. The experimental results also show that the seeds pickup ratio is more than 98%.

Abstract:In order to solve the problem of small seed's precision seeding, such as vegetable and flower seeds, a new type of magnetic cylinder-seeder was developed according to the magnetic seed-metering principle. By analyzing and comparing magnetic field route and intensity of one row suction head in the case of two kinds of polarity arrangements, the designed project was ascertained that four rows of magnetic suction head were assembled in the cylinder inner and its pole was arranged according to gap way. To improve the metering performance of this device, the orthogonal experiment was conducted with test object of rapeseed coated with magnetic powder, test factors of cylinder rotation rate and suction head's electric current. Variance analysis of the experiment results indicates that the suction head's electric current is the main factor and the optimization of two factors are the suction head's electric current of 230mA and the cylinder rotation rate of 15r/min. Under such working conditions, the single seed index is 93.6%, multi-seed index is 2.2%, and the seed-metering efficiency could achieve 3600 rows per hour, so it proves that this machine has higher sowing precision and better adaptability to small seeds.

Abstract:To improve the uniformity of the forage seed metering, a 3-D model was built to simulate air-stream distributive metering device using computational fluid dynamics (CFD) method, in which the distribution of airflow field and path curve of the particle phase were simulated using standard k-εmodel and discrete phase model (DPM), respectively. The results of simulation were in good agreement with experimental data. However, in the simulation, a few seeds were left in the distributor due to the air vortex, which impairs the uniformity of seed sowing. Therefore, CFD simulation was conducted to improve the structure of distributor, and vortex-caused seed detention was finally avoided after the improvement.

Abstract:Structure and seeding theories of the rice precision needle-like vacuum seeder was introduced. The experimental results for hybrid rice indicate that the seeder is capable to meet the requirement of precision seeding and low rate of damaged seed. The analyses of the experimental results indicate that the vacuum value is the most important factor, the angle of the needle top and rotate speed of the roller follow. The optimum operation condition with the level of factors as follows: vacuum value 4.8kPa, the angle of the needle top surface 30°and rotate speed of the roller 5r/min.

Abstract:To solve the problems of blocking and lacking outfitting machinery in wheat no-till planting in corn residue under controlled traffic conservation tillage farming system in annual two-crop region of northern China, the 2BMDF-2/7 row-followed no-till wheat and maize planter for controlled traffic system was designed. Combing of row-followed operation to sheer off corn stubble by using wheel tracks and power driven chopping anti-blocking mechanism, it can be used to solve the problem of no-till wheat planting in corn residue. Field test shows that the planter has a good performance of trafficability with the ratio of sheering off corn stubble 85% and anti-blocking capacity, thus to finish wheat and maize no-till planting. The variation coefficient of seed depth was 19.4% and 23.4% for wheat and maize, respectively. This machine can implement both wheat and maize no-till planting. Therefore, this planter can be a good solution to current problems in no-till planting in annual two-crop region of northern China.

Abstract:433h。By using the DH5937 stress measurement system and sensor technology, the data of the bending moment and torque of the cutter shaft were simulated and measured, and a combined load spectrum of the bending torsion coupling of the cutter shaft was complied. Meanwhile, an estimated formula of the fatigue life of the cutter shaft bearing combined stresses was deduced by using Miner liner cumulative damage theory, and the fatigue life of the cutter shaft was estimated to be 443h longer than the designed life by using the load spectrum of bending torsion coupling.

Abstract:e=3mm, R=19mm,α0=-40°,φ0=36°, S=155mm, H=180mm。A new type of rotary transplanting mechanism with planetary gears, which is used to transplant seedlings for high-performance rice transplanter, was introduced Work principle and structural feature of the mechanism were analyzed, and its kinematic models were established. Parameters optimization software based on Visual Basic 6.0 was programmed. Kinematic property was analyzed and simulated, based on the optimization method of human-computer conversation, then structural parameters of the transplanting mechanism were obtained, which could meet the demands of transplanting seedlings, such as, e=3mm,R=19mm,α0=-40°,φ0=36°, S=155mm, H=180mm.

Abstract:The key technology of no-row corn harvester is how to make corn stems being fed effectively. Through analyzing the structure of existing no-row corn harvesters, a new improved project was advanced on the basis of feed-in mechanism with finger rotor, stem-rotor and ear-rotor were installed independently, and the ear-rotor was closed with sweep auger. The stem-rods were straight and the ear-rods were bended, their eccentricity orientations were opposite when they were installed, but they turned in the same direction. As the ear-rotor was moved backwards, the effectiveness of ears delivery was improved, and interference between the stem-rods and the ear-rods was avoided. Change of the stem-rods eccentricity mounting orientation strengthened their ability to transport stems, and increased effectively the range of feeding stem, thereby the adaptability of the harvester to different corn row was improved. By designing the stem motion simulation algorithm, virtual test of the stems motion was completed with the Matlab software, and the movement law of the stems was discussed. Equation of the ear-rod was established, these provided a theoretical basis for the development of prototype.

Abstract:The oscillating hot air that generated by a pulse combustor can be used to atomize and dry liquid materials. It has many advantages, such as low operation cost, high drying quality, and simple structure of the dryer. A small Helmholtz pulse combustor was used in this research. An optical analyzer was employed for measuring the mean diameters of atomized droplets and droplets size distribution. The feed rate and viscosity of liquid material, frequency of oscillating hot air are the main factors affecting the atomizing properties. The experimental results indicated that the uniform droplet size distribution could be obtained under the conditions of a low feed rate, high-frequency pulsating flow and moderate viscosity.

Abstract:A performance measuring system of agricultural products processing machine for testing the mechanical performance of rice mill and hammer mill was designed. The measuring system was designed based on mechanical devices, took an industrial control computer as host computer, PLC as main control unit and Kingview 6.5 as software development platform for IPC. It can measure in real time and display data of transducers of the measuring system. The system can analyze, process, display, output and store sampling data to get related main technical performance parameters of the tested machinery accurately and quickly. By performing experimental test and metrology verification, it is demonstrated that the system runs steadily and every specified control function has been implemented reliably. It should be highlighted that the measuring accuracies of mass, power and temperature are higher than the design demand by 0.5%,1.5% and ±1℃, respectively.

Abstract:The hydraulic calculation of drip irrigation submain units plays a key role in the system design. The finite element method with virtual emitters can compute the head loss of each submain and capillary. The ways to reduce computational errors were suggested by selecting a certain amounts of elements in order to meet drip irrigation design need. Moreover, finite element method with virtual emitters can reduce computational work and memory demands dramatically. The research method put forward in this study provides a new way for hydraulic design of large drip irrigation system.

Abstract:As an extension in precision agriculture, it utilizes various high techniques to manage soil and water resources in pasture environment. However, the pastureland, which is different from arable field, does not allow the on-the-go survey with multi-sensor system because of the physical destruction in the field. This study used an innovated dual-sensor penetrometer together with a GPS receiver to collect the information of soil water content and hardness in a pastureland (1.27hm2). To present the distribution of both parameters in field-scale, firstly, partial least squares (PLS) was employed to mend the set of raw data due to over-hard, and then Kriging interpolating method was used for digital mapping. Moreover, the spatial variability of each parameter associated with the correlation between water content and hardness was preliminary investigated.

Abstract:A scaling definition based on two times scale was provided for soil fragmentation analysis. An experiment was conducted to uncover the relationships among soil fragments fractal dimension and the falling weight, falling height, soil moisture content, and specific fragmentation energy. The result shows that no relation exists among fractal dimension, falling weight and falling height, but obvious correlation appears among soil fractal dimension, moisture content and specific fragmentation energies. A further comparison of fractal dimensions shows that soil under impacting action has a much lower value than that under natural actions.

Abstract:42.6%、86.2%、92.1%。Exergy analysis is a kind of scientific and comprehensive energy analysis method. By making positive and negative thermal balance analysis on new type Ⅱ biomass briquette hot-water boiler, we got the conclusion that the largest exergy loss lies on irreversible burning which reaches 69.93%, and irreversible heat transfer exergy losses follows, reaches 14.5%, then the calculation results were analyzed using the concept of avoidable exergy loss, the results show that the position of combustion, the position of heat transfer, the position of smoke and the practical efficiency of the exergy are respectively 42.6%,86.2%,and 92.1% after adopting the concept of avoidable exergy loss.

Abstract:The basic parameters of plant straw packaging container, such as Poisson ratio, elastic modulus and so on, were gained by means of static compression test. The mechanical model was established from the force-deformation curve, and the packaging container was also analyzed through finite element method (FEM) based upon parameters and the model above. Some parameters such as the stress distribution law, stiffness and breaking strength under compression load were obtained and the easy-crackled position was also determined. It is proved that the calculation results are in accord with the experimental results. The research is the foundation for study on crack damage of tableware and provides evidence for the structure design and mould development.

Abstract:2.608MPa。Particles of rice straw processed by sodium hydroxide can be used as binder in biomass fuel. The quadratic orthogonal rotation design with three factors was used to study the effects of the mass fraction of NaOH, temperature, and reaction time of alkali treatment on shear bond strength. Functional models of shear bond strength with three factors were established and analyzed by regress method in SPSS13.0 and response method in Matlab 7.1. The results show that the regression equation was effective, and the mathematical model for the simulation was presented. The effect order of three factors was as follows: the processing temperature, the amount of consistency, reaction time. The optimum conditions were 1.5% of consistency, 95℃ of temperature and 17h of reaction time.

Abstract:According to the characteristics of longan, a forced-air pre-cooling device of longan for test was designed. Based on 7/8 time of pre-cooling, the relationship between air velocity and pressure drop or voltage frequency was obtained in test, and furthermore, the relationship between air velocity and energy was studied. The results show that the pre-cooling fan works more slowly, but costs a long time with a lower level of energy cost. In reality, a less time consuming method was needed. The method is controlling the increase of the air velocity with the decreased temperature of longan, the relationship between them was described, and the test proves the conclusion is reasonable.

Abstract:Taking the main factors of apple processing by microwave vacuum drying into account, such as microwave power, vacuum level and initial moisture content, the predicted second-order regression model of the sensory quality of microwave vacuum dried apple slices was obtained according to the experimental data by using orthogonal rotatable central composite design, and effects of these variables and their interaction on the product quality were analyzed by response surface method. To acquire higher quality of product, the ideal processing range of microwave power, vacuum level and initial moisture content were determined as 10.6～12.7W/g, 0.083～0.094MPa and 0.6～0.9 respectively. The optimal drying condition was found at microwave power 11.7W/g, vacuum level 0.089MPa and initial moisture content 0.75，with the maximum predicted sensory quality mark as 9.51, and the experimental validated mark as 9.42. The results prove that the regression model agrees well with the microwave vacuum drying process.

Abstract:8.09%和71.21%。The optimum processing conditions of the lentinan enzymatic extraction and the decoloration method of mushroom polysaccharides were discussed. By using papain and cellulose enzyme complex processing method, the ratio of the volume, temperature, the optimum pH value and role of time for orthogonal experiment were determined respectively. The optimum technology of enzymatic extraction of lentinan was as follows: the quality proportion of papain and cellulose enzyme was 2, the enzyme reaction temperature was 55℃, pH value was 6.5, the reaction time was 3h. The extraction rate reached 16.1 percent under this condition. The optimum condition of decoloration technology by orthogonal experiment was as follows：quantity of activated carbon was 2.0%, temperature of decoloration was 30℃，pH value was 4.0, the adsorption time was 90min.

Abstract:65%。Effects of different additive on physical properties and natamycin on antibacterial property of natural fruit wax were studied, and the preparation technology of preservative fruit wax was proposed which was composed of shellac 120g/L、morpholine 20mL/L、propanediol 10mL/L、ammonia 12mL/L,the emulsion time was 30min, and 0.6g/L natamycin was added when the temperature was down to 60℃. The glorious orange and grapefruit were with good quality and appearance after being coated by this preservative wax under 5～10℃ and 60%～65%RH for 45d, furthermore, the weight loss rate was about 70% lower than uncoated fruits and the good quality rate was enhanced to 65%.

Abstract:24%。Animal's welfare can be feed back from their vocalism. Some experiments were conducted to get 35-day-old chicken's vocalization in different environments, including normal environment, light off environment and human disturbance environment. Based on Mel frequency cepstral coefficient (MFCC), a new algorithm for feature extraction——subband Mel spectrum centroid (SMSC) was adopted. Support vector machine（SVM）classification model was used to evaluate the performance of test using different sound parameters. The results show the accuracy of recognition of SMSC was 24% more than MFCC parameter.

Abstract:Two advanced algorithms of generating path guidance line are proposed: the Hough transform-based is to pre-limit the angular value of possible collinear points before peak detection. This enables swift key-info abstraction in orderly-planted fields while offsetting imperfections brought by previous image segmentation, the solution to generate guidance line in forestry environments and locate points of trunk-and-earth intersection, then a dot array in the middle of the two point series is obtained. Then two methods are applied to process the dot array: either to detect a line for guidance using Hough transform or to least-square fit the two point series, so a line through the center is acquired to be the guidance path. Simulations and comparisons through Matlab show that the two algorithms are able to robustly recognize paths in their respective fit scenes and effectively process images in batches.

Abstract:Based on the features of plant disease image, vector median filter was firstly applied to remove noise of the acquired color images of grape leaf with disease. Then texture features and color features of color image of leaf with disease were extracted as feature vector. And by using Mercer kernel functions, the data in the original space was maped to a high-dimensional feature space in which the data has been clustered efficiently. The precision of four kinds of experimental maize diseases recognition is 82.5%, and kernel K-means clustering algorithm suited the plant leaf disease classification recognition.

Abstract:2倍多。In computer-vision-based systems for detecting foreign fibers, an efficient segmentation method is vital for improving the speed and precision of detection. An image enhancement model was presented based on histogram analysis, an improved Otsu's method was proposed for segmenting gray images of foreign fibers, and the segmentation results were analyzed in detail. The results indicate that all histograms of gray images of foreign fibers are of single peak, and the contrast between object and background can be remarkably enhanced by the enhancement model presented. The Otsu's method is effective for images of sheet foreign fibers, but does not work well for images of wirelike or villiform fibers, as some background pixels with gray values closed to the threshold are easily segmented as object pixels by mistake. But after the images were enhanced, the satisfactory segmentation results were achieved. The improved Otsu's method reduced the searching range for calculating optimal threshold from 0～255 to 150～230. The calculating speed in this stage was improved more than twice.

Abstract:On the basis of GSM with strong coverage power, a scheme, which can implement remote collection, transmission, and monitoring of farm field meteorological information, was presented to solve some problems, such as routing difficulty, high cost, distance limitation and restricted network access permission. Its structure and working principle were described in detail, and the software and hardware design was given. Furthermore, a type of application layer protocol, which will be useful for reducing congestion, was defined for more efficient transmission control and data recognition. The experimental results show that the proposed scheme is effective and efficient, and the given software and hardware design is feasible. The established remote monitoring system is flexible to be extended or reduced, and its communication success rate is 93.3%, which can fulfill the actual demand for remote monitoring of farm field meteorological information.

Abstract:Aiming at solving the problem of low accuracy existing in the nondestructive testing system for eggshell, a new hybrid scheme of rough sets and support vector machine for classifier designing was proposed. First, redundant characteristic parameters were reduced based on the rough sets theory. During reducing process, the characteristic parameters were quantified by fuzzy C means clustering algorithm, and the condition attributes were reduced via heuristic search according to their own importance. And then, the classifier was trained by support vector machine based on the reduction result. During training process, the classifier model parameters were optimized by cross validation. The experiments show that the accordance rate of the proposed method can reach 94.6%, which has great engineering application perspective.

Abstract:Refinement curve length of shrimp is an important factor in its weight prediction. Morphological filter was required to reduce branches of the refinement curve in order to get this value. The existence of branches was correctly judged by 3×3 neighborhood analysis of every pixel on the refinement curve. Then the length of refinement curves which contain branches could be calculated by erasing the endpoints to remove branches and average compensation method. The conclusion showed that the correlation was obvious, with the correlation coefficient of 0.894 between its refinement curve length and weight, 0.939 between the size and weight, and prediction correlation coefficient of 0.954 between comprehensive details both of the length and size of shrimp and the weight after modeling. The results indicate that it's promising to increase the predicting accuracy with refinement curve length.

Abstract:80%。A method of identifying corn and weed using fractal dimension was developed. The obtained original images in the field had to be transformed to the HSI space at first. Image transformation was done using the non-variety of H channel in the HSI space in order to reduce effects from illumination changes,which was in favor of image segmentation. In order to identify corn and weed, three computational formulas of fractal dimension were proposed and compared. Mean fractal dimensions of corn and weed were obtained by fractal software which was programmed using Matlab software. The result shows that the Bouligand-Minkowski method was more effective than other methods, and mean fractal dimension of corn and weed was equal to 1.204 and 1.079 respectively. The identify accuracies of method based on SVM reach 80%.

Abstract:92.3%。Corn varieties Zhengdan958, Liaodan565 and Jingke25 were selected as the research objects. Six general characteristics about color, shape and size were picked up from the digital image of corn seed. Support vector machine (SVM) was used to recognize, and the results were compared with neural network (NN) algorithm. The results indicate that the identification rate of SVM strategy is 92.3%.

Abstract:Aiming at the classification problem of the complex product voice of customers with a large number of catalogs and data volumes, a heuristic strategy was proposed to resolve the coding designing problem by using output of a probability minimax machine and sample interval attribute. An algorithm with less iterative steps of optimization was taken as a “weak” algorithm while preserving its other characteristics like large margin and geometric properties. The nonlinear mapping was applied for “weak” algorithms' output (vector) to work in high dimensional spaces and improve the performances. At last, the experiments with the proposed algorithm were described to show that the approach was more effective than others by using forklift VOC.

Abstract:In order to check the realizability of CNC system runtime logic and performance, technology of system dynamic modeling and analyzing based on net theory was introduced. A strategy of conditional equal-transformation of TTPN with inhibitor arc was proposed, which will descend the model dimension and decrease analyzing complexity. An analyzing model of the system motion control-associated processes was built, which was then transformed equivalently according to the foregoing strategy. With that model, a simulation was carried out and the quantitative basis for the system structure adjusting was given. Further simulation illustrates that the adjusted system is able to achieve expected performance.

Abstract:Focusing on the deficiencies in production line balancing of present methods, a new method named production line's dynamic balancing method, which combined heuristic method and visualization simulation together, was proposed. In this method, a double-objective model of line balancing was built up, which ensures the number of workstations and the smoothness index are both minimum. Then an improved particle swarm optimization algorithm was used to solve the problem. The production line system is suitable to build its visualization simulation model by the simulation software of Witness. At last, an instance of this method was discussed.

Abstract:Because of inertia and changing load, the angular velocity fluctuation of constant speed motor (CSM) was generated in hybrid mechanism, and the precision of output trajectory was reduced. The control strategy which applies servo motor tracking velocity of CSM was put forward, for CSM was uncontrollable. The control platform of hybrid machine was presented. The fuzzy controller was designed by means of the control scheme, and the velocity fluctuation was compensated for accurate implementation given trajectory. The result of experiment indicates that the fuzzy controller was feasible and effective.

Abstract:The dynamical behavior of MEMS devices is strongly affected by viscous fluid damping effects from the surrounding. These damping effects have to be carefully considered for the design and optimization. For predicting the hydrodynamic loading of an electrostatical device in viscous fluids, it is necessary to build an electrostatic-mechanical-fluidic coupled model, where the flows characteristics were described by Navier-Stokes equations. Comprehensive analyses of the static/dynamic closing behaviors of the microswitch in viscous fluids were performed. Compared with published work of other researchers available in the literature, the numerical model was validated. After that, the static/dynamic closing voltages of the microswitch in the air and deionized water were calculated. The transient behaviors of microswitch under different action voltages were also simulated, including the squeeze-film damping pressure distribution as well. The results show that the difference between the static and the dynamic pull-in voltage in the deionized water is smaller than that in air.

Abstract:Deformation of shape memory alloy (SMA) fiber shell was studied and the intelligent pneumatic muscle (IPM) with SMA shell was proposed to improve actuating characteristics. Output force equation of IPM was established through axial and radial static force equilibrium analysis between fiber stress and external force. The equation between temperature and contraction ratio of SMA wire was deduced by analyzing the volume ratio of martensite to austenite during crystalline structure shift between two different phases. This ratio was adopted to analyze the contraction ratio, contraction force and variable stiffness of intelligent pneumatic muscle. SMA deformation and characteristics test simulations were conducted in Matlab and different pneumatic muscles' characteristics were compared. The results show there is hysteresis in SMA deformation and IPM can get greater bias angle and more flexible stiffness variation by adjusting SMA contraction ratio. The greater the SMA contraction ratio is, the bigger the contraction force of IPM is.

Abstract:This paper explored dynamic characteristics of high-speed solenoids considering both attraction and release processes, while the present research was generally limited to the attraction process. An electric-magnet-mechanic coupling dynamic mathematic model of high-speed solenoids was established, and an incremental equation for the dynamic force was derived and analyzed which proved that the dynamic characteristics could be obtained indirectly from the static characteristics. Experiments and simulations of conical pole and planar pole high-speed solenoids were carried out with varied structural parameters respectively. And the comparison of dynamic characteristics of two solenoids indicates their suitable application ranges. The research results provide an effective reference for engineering design of high-speed solenoid.

Abstract:An algorithm of NC tool path generation for triangular meshing subdivision surface was proposed, which included three steps: first, the tool touching points were obtained through computing the intersection between the meshing model and the section based on the spatial index structure of triangular mesh subdivision surface; second, the cutter location points were generated according to the geometric properties on differential calculus of surface position corresponding to tool touching points; third, the cutter location points were ordered by using the minimum spanning tree algorithm, and which is proved that the algorithm can improve the efficiency of NC tool path generation and process precision effectively.

Abstract:This paper focuses on the analysis of running conditions and machining processes of conical cam with oscillating follower. Common errors were pointed out in the biased distance cutting. By analyzing the motion of oscillating tapered roller follower of conical cam, a new “3-D curve expansion” model of conical cam was presented trough-outline. Based on this model, a machining method for trochoidal milling was proposed with non-equalization diameter cutter. This new method is a creative and effective way for non-equalization diameter machining for conical cam with oscillating tapered roller follower.