Abstract:The hardware-in-the-loop simulation (HILS) system for continuously variable transmission (CVT) was developed for the study and development of electronic control unit (TCU) for CVT, and the construction and principle of the HILS system as well as control algorithm of TCU was described detailedly. The simulation system was used to carry out HILS experiment for TCU，and real vehicle test was carried out for simulation tested and optimized TCU. The results all indicate that the developed HILS system can provide real-time verification and optimal control to automotive integrated model and control algorithm of TCU, and a good simulation and test platform was provided for the development of TCU of CVT. 

Abstract:开发。Forward simulation approach can simulate vehicle with accuracy according to actual situations. With this method, simulation on CVT vehicle is conducted to get performance evaluation. By analysis of simulation results, and by adjustment of performance parameters, the credibility and accuracy of simulation are increased, the design of control strategy is realized, and the design period and cost are reduced. Comparing with the road test report, the simulation gives good predictions for the CVT vehicle. 

Abstract:In order to overcome the prediction error of classic torque converter model which caused by inaccurate shock loss prediction, a torque converter dynamic model with variable shock loss coefficient was developed. Using bond graph method, the model analyzes working wheel’s performance and energy losses to construct model formulas by geometry parameters, and variable shock loss coefficient method was used to improve model’s accuracy. Test result shows classic constant coefficient method’s percent error can reach to 15%～60% in speed ratio range between 0 and 1, but the result of variable shock loss coefficient is less than 10% in all conditions, which is better than that with classic constant coefficient method.

Abstract:The design method of 3-element centripetal-turbine hydrodynamic torque converters was investigated. A new design method based on torus streamline was proposed. The particle movement inside the hydrodynamic torque converter was considered as the curvilinear movement on a torus surface, and could be decomposed into meridional component movement and circumferential component movement. The meridional streamline equations and torus streamline equations were derived. The blade influence on streamline was analyzed and a streamlined thickness function was put forward. The equations of blade camber line combined with the thickness function, the blade surface equation was obtained. The research result shows that either a meridional streamline or a torus streamline is an approximate parabola. 

Abstract:In order to choose the reasonable powertrain mounting locations, the finite element models of a certain type of engine block, transmission and powertrain were established, and their dynamic characteristics were analyzed separately. The results show that the middle mounting point located on flywheel is better than which on clutch shell. Engine vibration severity has decreased from 3.92mm/s to 3.20mm/s, and powertrain vibration severity has decreased from 4.13mm/s to 3.43mm/s by changing the mounting locations. The experimental validation shows that reasonable choice of powertrain mounting locations is useful to reduce engine vibration transmission and increase ride comfort.

Abstract:In order to accurately test the fuel consumption with carbon balance method, a series of characteristic studies were carried out on V-cone flowmeters for exhaust flow measurement. The Fluent was used to simulate the flow of V-cone flowmeter, and the influence of key factors on the permanent pressure loss and discharge coefficient such as different values of equivalent diameter ratio, fore-and-aft V-cone and Reynolds number etc. were studied. Then, two V-cone flowmeters were designed and comparison experiment with Venturi tubes was carried out . Finally, two fitting formulas which were deduced from the Venturi tubes’test were used as calculation models. The result of the experiment indicates that the simulation and the experiment have strong consistency and the flowmeters are of great accuracy and stability, and they can be used to measure the vehicle exhaust gas flow. 

Abstract:A mathematic model of electro-hydraulic servo driving force control system for a hydro-pneumatic suspension was established. This paper analyzed the control method usually used in wave form reappeared. The fixed step phase and amplitude control method use ADALINE neural network based on Widrow-Hoff learning algorithm was emphatically introduced aiming at sine wave reappearing. This paper put forward phase and amplitude control improved method use relative quantity based on the analyses of the algorithm the convergence speed influencing factors. This learning algorithm and absolute amount control method were used to control a kind of hydro-pneumatic suspension force loading system model. The convergence rate, the relationship between convergence time and input signal’s frequency and amplitude, the relationship between algorithm convergence value and input signal’s frequency and amplitude was presented. Outcome shows that using the relative value as the input of the phase and amplitude control could improve the convergence speed and the reappeared precision of sine wave effectively. The phase and amplitude control can get better practical effect. 

Abstract:Pairs of magnets were installed in the path at certain interval and were detected by a magnetic ruler to correct accumulation error of position and orientation of inertial guided AGV. It was difficult to get the absolute position of magnets because of obstacles in job shop and this often caused trouble in debugging AGV. A teach-in method was used to record the position of magnets, and iterative learning control was introduced to update the aim point of AGV. After several times’ learning, AGV can run through magnets accurately. This method is easy to use in AGV path tracking. Accumulation of error can be eliminated when correction is done. The results of experiments in a tricycle AGV tugger were given to demonstrate the efficiency. 

Abstract:Based on the L-type stubble breaking blade and the wide rototilling blade, nine kinds of universal blades were designed. The optimum structure parameters of the universal blade were determined through the power consumption (torque) test of a single blade in a soil bin. The main structure parameters of the universal blade were as follows: the bend angle was 67°, bending radius was 20mm, sliding cutting angle of the frontal cutting edge was 12°, and the working width of a single blade was 60mm. The rototilling contrast tests between the universal blade and national standard rototilling blade and stubble cutting contrast tests between the universal blade and the mass produced stubble breaking blade were conducted. The test results show that: the power consumption per unit working width of the universal blade was less than that of national standard rototilling blade, but more than that of the typical stubble breaking blade. When they had the same width, the universal blade power consumed was less than the national standard rototilling blade and the typical stubble breaking blade, which proved that it was reasonable and feasible to select the structure parameters of the universal blade. 

Abstract:6.89%。This paper briefly describes the main structure, work principle and design of critical components of 2BYS—6 type paddy weeding-cultivating machine, and also analyzes the kinematical characteristics of the rotative weeding and the swing weeding. The experimental result of the machine in the field in which rice was transplanted by rice transplanter shows that the between rows average cleaning rate (relative cleaning rate) was 78.1%, the average cultivating depth was 4.39cm, the injury seedling rate was under 6.89%, and the other various performances came to the design requirements. 

Abstract:Focusing on the problem of lacking suitable bed former for permanent raised beds (PRB) in one crop a year oasis agricultural region of northwest China, 1QL—70 bed former for PRB was designed, and the parameters of key components were analyzed and confirmed for bed-forming plough, combined forming-pressing device etc. Through adopting cultivated-type plough, the new bed-former could plough and smash the soil effectively. Combining with cylinder roller, the combined forming-pressing device could not only form the bed shape, but also press the beds effectively. Experiment results showed that the bed former was effective in forming and renovating the beds. Bed dimension and surface evenness after forming and renovating could meet the requirements of the agronomy in Hexi Corridor.

Abstract:To control the problems of weeds which are frequently and massively occurring under permanent raised bed (PRB) system in Hexi Corridor, a sprayer-and-cultivator-combined multifunctional weeder was designed with the compound configurations of chemical sprayer and mechanical cultivator which were set up on a three-section foldable frame and could be applied alternatively or mutually as to the specific requirement. Three pieces of foldable shields were installed to reduce the drift of the chemicals. As most of the weeds are perennial in the area and can hardly be eliminated by chemical spraying, and also some annual weeds can not be simply cut off by mechanical cultivator, this sprayer-cultivator-combined weeder could function as a manner of integrated weed control along the whole growing period of wheat and maize. Field experiments show that the chemical and mechanical combined treatment managed a significantly better weed-control performance (97.3%) which was higher than either spraying treatment (94.6%) or cultivating treatment (89.2%). That means under permanent raised bed system chemical sprayer and mechanical cultivator combined mode is the optimum pattern to get effective weeds control. 

Abstract:49.95％。The flow field and droplets trajectory of the existing double-foil shield was analyzed by computational fluid dynamics software Fluent and improved scheme was put forward. Contrast experiment on flow field, droplets trajectory and droplet rate with shield before improvement and conventional spraying was carried out in simulative experiment and wind tunnel. The simulation experiment results indicate that improved double-foil shield was good for droplets to deposit and provided a deposit of 76.88% with the wind speed 3m/s, more than that before improvement which was 63.26% and conventional spraying was 50.16%. The wind tunnel experiment results indicate that improved double-foil shield provided a deposit of 73.35% with the wind speed 3m/s, more than that before improvement which was 66.90% and conventional spraying was 49.95%. 

Abstract:Uniform design was used to test the soybean seeding performance of an air-blowing vertical-rotor type precision seed-metering device in laboratory. Based on test results, regression models of seeding performance were constructed by uniform design software UST 1-0. The effects of designing and operating parameters of air-blowing vertical rotor seeder on its performance were investigated. The results suggest that seeding performance is sensitive to air pressure and operating speed in air-blowing condition. The qualified seeding rate is over 85% in 1.4～1.8kPa air pressure and can satisfy the needs to seed soybean at over 8km/h operating speed. Seeding performance of the air-blowing vertical-rotor type precision seed-metering device is insensitive to seed-filling angle and seed-cleaning angle. The optimized results for seed-filling angle and seed-cleaning angle are consistent with the results at atmospheric pressure, which are 46.35° and 55° for seed-filling angle and seed-cleaning angle respectively. There is no remarkable influence of the airblowing direction on seeding performance.

Abstract:94.2%。Metering device capability directly influences the performance of rapeseed planter. In order to define the mechanical structure parameters and the movement of air current in the pneumatic precision metering device, simulation research was respectively made on air current under positive and negative pressure with orthogonal method and ANSYS/CFX tools, and the research result was also validated by the experiment. The research shows that the quantity of holes in metering device disc is the pivotal factor of influencing the air current and seeding quality. When the quantity of hole is 25 and the pressure of hole in negative pressing area is -754Pa, the seeding eligible index is 94.2%. 

Abstract:A design method of fuzzy control system of combine cylinder based on VHDL and FPGA was proposed. With the fuzzy logic toolbox of Matlab, the fuzzy inference rules and the algorithm architecture of cylinder were constructed. According to top-down mode, the VHDL modular design of the controller was carried out. Time simulation and function simulation of the fuzzy controller were proceeding on MAX+PLUSII, and the design was realized. The results indicate that FPGA implementation of fuzzy control about combine cylinder has many advantages, such as timing test is convenient, inference speed is high, design modification is agile, and system integration is great. It is an efficient method to implement intelligent control strategy. 

Abstract:In order to solve major problems of the high power consumption of threshing and separating of rice combine harvesters, more short trash in product, uneven distribution, and so on, a new threshing drum with short-rasp-bar tooth was developed, and then the experiments were conducted. The experimental results show that this new device has lower power consumption while threshing rice, less impurity contents and comparative uniform distribution, thus reducing the cleaning load effectively. Furthermore, by means of regression analysis, applying DPS software, the mathematical models of threshing and separating systemshort-rasp-bar-plate tooth drum were established with grid concave, including threshing and separating grain losses rate, power consumption and distribution of outlier along cylinder’s axial direction. Lastly, a multi-objective optimization was applied on the system based on Matlab optimum toolbox, so as to get the comprehensively optimistic operating parameters.

Abstract:2-D mathematic model of unsaturated soil moisture movement of gutter on the condition of water conservation in arbor-shrub-hedge-gutter was established based on the theory of soil water dynamics and the characteristics of soil moisture movement. The finite element method was used to solve it. A series of indoor experiments were conducted to verify the model. The computational results derived from the model of water front and soil moisture content were in accordance with the experimental results. It indicated that the mathematic model of soil water movement is correct and solving of the model with finite element method is feasible.

Abstract:Based on the principle of variable-gap and fixed-pressure, the design idea and technology scheme of rotary-cutting ramie-stripping machine were presented. The working principle and technical characteristics of rotary-cutting mechanism for the arc variable-gap and fixed-pressure in double floating fulcrums were analyzed. According to the stress conditions of rotary-cutting mechanism, the relevant process parameters which affect the quality of ramie-stripping were tested and measured, on the basis of which, the main structures and parameters of rotary-cutting were designed and calculated, and the research on power and motion parameters of the mechanical model was made deeply in theory. The 6BX—40 prototype’s trial and test showed that its stripping efficiency was raised 2～3 times than traditional methods, the glue content in fiber 25.8%, impurity rate 4.6%, loss rate of fiber 4.3% and the stripping quality met the national standards for quality requirements. 

Abstract:19%以上。In order to investigate the heat exchange principle between the ceramic balls heat carrier and biomass powder, heat exchange experiments were conducted with ceramic balls of 90℃ at 1.0, 1.2 and 1.4kg/min and biomass powder of ambient temperature in a vertical down tube heat transfer reactor. The percentages of heat conduction and heat convection of the total endothermic flux of the biomass powder were determined at different ceramic balls mass flow by heat balance analytic method. The results indicate that the heat conduction was the dominant heat transfer mechanism which reached 61%～87% during the heat exchange between the solid heat carrier and biomass powder. The heat conduction ratio decreased distinctly and the heat convection increased over 19% when the ceramic balls mass flow increased from 1.0kg/min to 1.4kg/min. 

Abstract:The down-flow tube reactor was used for biomass pyrolysis liquefaction and proved effective. In order to study the characteristics of heat transfer between ceramic balls and biomass chars, an improved experimental platform of down-flow tube was designed based on the former research. In addition, the former experimental material biomass particles were replaced by chars, and the result of experiment would be indicative to the industry application. Based on the heat exchange experiment among the ceramic balls at different temperature (50,60,70℃) and the air at room temperature, by the analysis of thermal equilibrium, the convective heat exchange coefficent between ceramic balls and the air was worked out and the value was about 600W/(m2?K). The result of heat transfer experiment between ceramic balls and chars shows that temperature in the vertical tube obeys linear rule as the edge effect is not considered. The leading way of heat transfer in the down-flow tube is the convective heat exchange. 

Abstract:High oxygen (21%～100%) is effective in inhibiting anaerobic fermentation, enzymatic discoloration and flavor loss, so it has been a new way of storage. The effects of high oxygen on postharvest physiology, biochemistry, chemical components and quality of fresh fruits and vegetables were reviewed, including respiration, ethylene production, tissue browning, reactive oxygen species metabolism, volatile compounds, nutrients, color, texture and decay. The limitations of research were discussed. It provides a reference for further research on high oxygen.

Abstract:The gas replacement device is the key part of the modified atmosphere packaging machine. The structures of two typical kinds of gas replacement devices with trays were analyzed. The mathematical model of 3-D turbulent gas flow field within the tray was proposed, and then the numerical simulation of the gas-flow field was conducted by means of the Fluent software. The distributions of the flow field within trays for two kinds of gas replacement devices were obtained. The evaluation indexes of the flow field for ensuring the quality of gas replacement within tray were established. Effect of the arrangement mode of gas inlet and outlet on properties of gas replacement was analyzed. The results show that, compared to the typical traditional structure, the new gas replacement devices has better performance in replacement ratio of gas, static pressure distribution, average velocity of flow, and gas consumption. 

Abstract:MBM。Representative ruminant concentrate supplement and MBM samples were collected, and 235 calibration samples and 152 external validation samples were prepared. The spectra were scanned from 400～2498nm. The effect of spectrum pretreatment methods and spectrum region on the calibration results was considered. The calibration equations were established by SIMCA (soft independent modeling of class analogies) and DPLS (discriminant partial least squares) respectively. For external validation set, the accurate discriminant rate of SIMCA method was 96.1%, and the accurate discriminant rate of DPLS method was 100%. Comparing with NIRS quantitative analysis model of MBM in ruminant concentrate supplement, NIRS discriminant analysis model can detect if ruminant concentrate supplement was adulterated with MBM or not. 

Abstract:In the wavelength range of 350～1?800?nm, different preprocessing methods were developed to improve the predictive ability and robustness of model, but the effect was not better than interval partial least square (iPLS). The characteristic wavelength bands of 642～787nm, 861～1006nm, 1080～1152nm and 1226～1371nm were determined by iPLS characteristic wavelength bands selection method. The performance of the model calibrated with sensitive wavelength bands was predicted by 30 unknown Nanfeng mandarin fruits, the correlation coefficient and root mean square error for prediction (RMSEP) were 0.95 and 0.55°Brix respectively. It was suggested that near infrared spectroscopy (NIRS) combination with iPLS characteristic wavelength bands selection method was a powerful tool to improve the predictive ability and robustness of nondestructive measurement model. 

Abstract:The semiconductor laser beam and computer vision technology were used to monitor the surface damage and inner decay of apples (c.v.gala). In the experiments, the damage was produced by falling of a spherical steel ball (diameter: 16mm, weight: 96g) on the apples from a height of 20cm, to simulate the damage caused during the picking and transportation. In order to simulate the inner decay, 15μL suspensions at 105/mL conidia of Penicillium expansum was injected into the inner of the apples by a micro-injection. The laser scattering image analysis indicates that the number of the pixels of the images (S3) reached the maximum (3964) after 36hours after damaged, and had significant differences with the control group during 84 hours after damaged (P≤0.05).After injecting the suspensions, the number of the pixels of S3 reached the maximum (3682) on the 4th day, and showed significant differences with the control group on the 7th day (P≤0.05). This trial laid a theoretical basis for applying low power laser beam to monitor the surface damage and inner decay of apples.

Abstract:The experiments for stress-strain and lateral pressure of sunflower seeds by uniaxial pressing were carried out. The results show that sunflower seeds conform to the model of three power curve. By using of Kuhn's yield criterion, plasticity constitutive equations were developed. Sunflower seed strain of theoretical and experimental value of the actual value of the maximum relative error is 19.7%, with an average error of 5.3%. The constitutive model can show a better description of sunflower seeds in the press process of plastic deformation. Kuhn's yield criterion can be used as theoretical basis for plasticity model of sunflower seeds. 

Abstract:Cascade control PID was used to adjust the density of the starch production-line. After analyzing and comparing the principle of traditional PID and Smith prediction PID, a mathematical model about cascade control loop of starch production-line was proposed. Then, these two controllers and their outer loop controller were designed and simulated by using tradition PID and Smith prediction PID respectively. The simulation results show that the cascade control system with Smith prediction PID on its outer loop is better than traditional PID. In the end, the implementation of a rapid prototyping control system was presented, which involves the design of DSP algorithms by using Matlab/Simulink blocksets to setup the Simulink module of the starch production-line, automated code generation in the CCS integrated development environment, and downloading of executable code to the Texas Instruments’ TMS320C2812 and TMS320C6713.

Abstract:Eighty milk powder samples which represented over 10 formulae of ingredients from 11 commercial brands were collected and a PDA type near-infrared spectrometer was used to obtain their diffusion reflectance spectra (1nm resolution) within the wavelengths of 1089～2219nm. The obtained spectra were pre-treated with standard normal variate correction (SNV), wavelet denoise and 1-order differentiation method. Through comparing the weighted distribution of the milk powder’s five principal ingredients at various wavelengths, different ranges of wavelength were selected to establish calibration models and to analyze their prediction accuracy. The results showed that spectrum information of milk powder’s protein and fat composition was mainly distributed within the wavelengths of 1100～1400nm and 1800～2200nm. It was shown that wavelet denoise was an excellent method for pre-processing spectra, which could significantly enhance the stability of calibration models and prediction accuracy. The present study reveals that it is feasible to determine the concentrations of protein and fat in milk powder of various origins with a PDA type near-infrared spectrometer. 

Abstract:Fermentation conditions of xylanase production by Streptomyces F0107 were optimized. More than 80 actinomycetes obtained by isolating from dozens of decaying wood, debris and soil samples of different parts of China with corncob xylan as the sole carbon source, all degraded xylan and produced evident xylan hydrolyzed circles. Xylanase production by a newly isolated Streptomyces strain F0107 was studied by using submerged fermentation under shaking. Production of xylanase by F0107 on corncobs xylan was enhanced by optimizing the carbon source, nitrogen source, initial pH value of the culture medium, rotation rate and temperature. The results of single-factor experiment showed that insoluble corncob xylan was the best carbon source, a combination of yeast extract and peptone was the best nitrogen source, and the optimal initial pH value was 5.0. The optimal cultivation temperature and rotation rate were 32℃ and 140r/min, respectively. The maximum increase in xylanase production (41%) was observed in the presence of Tween 80 at a concentration of 0.4%. After optimization of various production parameters, the maximum xylanase yield (332.17U/mL) was obtained with no carboxymethy cellulase activity in 8 days of cultivation. In addition, SDS-PAGE and zymography analysis of culture supernatant under denaturing conditions revealed the presence of two xylanases with the molecular mass of approximately 38.9ku and 24.4ku, respectively.

Abstract:1IU/mL基本一致。This work reviewed fermentation medium culture of nisin by single factor experiment. The results indicate that nisin activity was mainly influenced of molasses, corn steep liquor, K2HPO4 and MgSO4. Box-Behnken design and response surface analysis methods were applied to confirm optimum concentration of mainly effect factor. The results show that the optimum medium culture was corn steep liquor 233g/L, molasses 27g/L, K2HPO4 5g/L, MgSO4 0.1g/L. Under those conditions, nisin activity is 2491.8IU/mL, which is in consistent with predicted value 2511.1IU/mL. 

Abstract:A rapid detection method of crop-row based on improved Hough transformation was suggested to detect the position of crop-rows after analyzing the characteristics of field crop planting. The true color images containing crop-row and soil background were captured as the research objects. Since the histogram projection is easily disturbed by external factors and the Hough transformation has a low speed, a combination of these two algorithms was developed. First, a true color image of field crops was processed with 2G—R—B gray and OTSU to separate plants from soil. Second, the noise was eliminated by fast median filtering algorithm, and then the image was divided into ten horizontal strips to get the anchor points according to the geometric distribution of the crop-rows. Finally, the centerline of crop rows was obtained by Hough transformation using those points. Test results show that the processing speed of the improved Hough transformation method is four times faster than that of original Hough transformation with the similar positioning accuracy, and the centerline detected can highly match the crop-row. 

Abstract:23ms。The influence of the various illumination, weed, and shadow environment to the path recognition was investigated. A new research method for vision navigation system of agricultural vehicle in the application environment was proposed. The various navigation environments were classified automatically by neural network. According to classification results, different path recognition methods were applied in navigation system. Experimental results of the recognition and the classification prove that the method is effective and can improve the practicability and reliability of vision navigation system. The classification correct rate is 95%, and the average cost time is 23ms. 

Abstract:5cm。In the farmland non-structurization natural environment, navigation route’s extraction algorithm was studied based on machine vision. The distance and angle between camera and navigation route was gained by the perspective projection. The algorithm was successfully transplanted to TMS320DM642 hardware platform, and optimized on a C programming language level. In the examination, it shows that the biggest error of deviation angle between camera and navigation route is 2° and the biggest deviation distance between camera and navigation route is 5cm.

Abstract:An algorithm of producing navigation line for robot in forestry environment based on machine vision was developed. By scanning an image, boundaries between the tree bottom and earth are recorded, and the central points between both tree bottom sides are gained and a straight line generated by least-square fitting to perform as the navigating line. A central line was obtained as the navigation guidance line. Matlab simulation results show the arithmetic efficiency in various forestry environments, in accordance with human vision recognition. The reliability and stability are demonstrated during batch processing. 

Abstract:Based on the MapGuide module of WebGIS and .net technology, the expert system for prediction and forecast of agricultural pests on the Web was designed and developed. The pest categories were bio-regionalized in the system. The experts’ knowledge, abstracted from their experiences and including the description of the knowledge, the critical values for the description, terms for distinguishes, and the grade of pests harm, formed a Web model and was stored in tables supported by SQL Server 2000. Expert-knowledge-based forward reasoning and case-based reasoning (CBR) were employed in the inference engine. Users can provide the necessary field-monitoring data to the system with the wizard and the guide of hint in the interface, and can get the potential grade of pests harm in GIS thematic map, chart and text. The demonstrations show that the system is easy to use and the prediction is accurate and intuitive.

Abstract:Main structure of product family can be depicted as a directed complex network. Parameters such as node betweenness, edge betweenness and Q function values were calculated through simplepath detecting algorithm for obtaining distributing curve of Q and clustering dendrogram. Division results can be gained from clustering dendrogram. The results were adjusted and optimized according to parts usage times and entities with sign. As an example, a product family of the industry steam turbine was analyzed with this algorithm and some practical results were obtained.

Abstract:To meet the requirement of networked manufacturing, an architecture of networked integration communication based on different numerical control systems in the workshop level was established, which integrating the information of the equipment level and the workshop applications level so as to realize integration and information interactions between shop-floor equipment and top-level application systems networked communication mechanism of communication system was constructed, information integration of applied equipment, and its information integration within enterprise based on common object request broker architecture (CORBA), information integration between enterprises based on Web services were discussed. This communication system is helpful to integrate manufacturing information within and between enterprises in the networked manufacturing system. 

Abstract:Problems such as complex variant process and the easiness of generating conflict of constraints existed in traditional variant design methodology. Aiming at the problem of the complexity of dependent relations among parts as well as configuration and variation in design process must be alternated and intervened by designer, a rapid variant design approach under design template frame was proposed. Taking advantage of flexibility and information carrier function of templates, concept of variable element was put forward. Rapid variation of artifacts was realized within definition domain of template through creation of interrelation among variable elements to relate parameters with each other. An example of gearbox of small agricultural machinery was used to verify that serialization through structural variation and diversification of product through changing the geometric parameters in same series.

Abstract:With the increase of structural parameters of a rotary machine, the sealing induced airflow excitation on the rotor increases significantly. By taking Muszynska’s model for sealing force, the nonlinear dynamic equation of a rotor with cracked foundation was derived. According to adaptive control theory, a multi-parametric adaptive algorithm was presented. Numerical simulations on the rotor system were performed with this method. The results show that the parametric adaptive control method possesses strong capability of stability in control. The methodology is appropriate to the complexity of multiple parameters of non-self-governing chaotic system, when the system goes into chaos by outside disturb, and the working state can be adjusted to normal timely. The research results also provide the theoretical foundation for theory design of rotary machine and fault dynamic monitoring, and have high practical value. 

Abstract:Performance of nozzle-flapper servo-valve driven by piezoelectric bimorph is decided in a great extend by the parameters of control system. Proposed a new control method of the integral separate PID for a piezoelectric hydroelectric servo-valve based on working mode of the servo-valve and the need to debug, a digital controller is designed based on the optimal control parameters of control system of the servo valve. The control effect is investigated through experiments, and how control parameters effecting on performance of servo-valve is analyszed. Response time of servo-valve is less than 6ms when the proportion coefficient is 5.3, integral coefficient is 0.35 and differential coefficient is 3.0. Consequently, it is shown that the digital controller can meet the needs of designing and improving the servo-valve. 

Abstract:Aiming at solving two key problems namely main shaft movement error (MSME) separation and the signals’ denoising existing in improving the measurement accuracy of the roundness on-machine measurement, a new roundness on-machine measurement method was proposed. In this method, the improved reverse method (IRM) was introduced to minimize the influence of the MSME on the roundness error. Wavelet transform based denoising technique was applied to separate the noise and the high frequency components from the roundness signals. The experimental results show that the measurement accuracy of the proposed method nearly reaches that of the coordinate measuring machine, the relative error is 4% on average, and the repeatability is nearly the same. 

Abstract:The surface of the bearing inner raceway was finished by pulse electrochemical finishing (PECF). A mathematical model was developed and the effects of finishing parameters, such as the interelectrode gap, current density and the finishing time, on the anodic smoothing was analyzed. The results show that predictive results based on the developed mathematical model are in good agreement with the experimental results. The developed model can not only explain the mechanism of anodic smoothing, but also be used as a guideline for accurately choosing finishing parameters. 

Abstract:0.008mm。By introducing the concept of surface generation points, an instantaneous force based tool deformation calculation method and the solid modeling method of deformed tool swept volume were proposed, and the solid model of machining simulation including geometry and physical errors were generated. The machining process was shown by computer graphics dynamically and the measurement method for solid model of machining simulation was also presented. The whole system was implemented by using OpenGL and PARASOLID modeling kernel. The result of machining simulations case study and the actual machining experiments indicate that the maximum and minimum simulation errors were 0.012mm and 0.004mm respectively, and the average error was 0.008mm. 