Abstract:Vehicle sideslip angle is employed by the vehicle stability control system (VSC) as the basis for predicting the vehicle maneuverability and stability. The scheme of sideslip angle test system based on the ‘1+2’ GPS technology, i.e. one base station and two roving stations, was proposed, and the corresponding system was developed. The paper firstly introduced the primary sensor matching and the devices installation, then described the computation method for the sideslip angle based on the GPS data. Finally, the systematical road way tests were conducted, and the effectiveness of GPS scheme was verified by the same group test data of sideslip angle obtained from the double-direction optical speed sensor. The sideslip angle test system was characterized of high frequency and accuracy for positioning, velocity and sideslip angle measurement for vehicle body and road wheels, and of convenient installation on the spot. It can provide the credible test ways for the verification of the sideslip angle estimation algorithm and the control logic of VSC. 

Abstract:In order to obtain vehicle longitudinal dynamic parameters for intelligent cruise control (ICC) fast and at a low cost, a parameter identification method based on vehicle longitudinal dynamic model was proposed. Five kinds of road experiments, including standing still, coasting in neutral gear, coasting with engaged gear, driving with constant speed and braking, were designed for data collection. A Kalman filter was designed for data preprocessing. Such vehicle longitudinal dynamic parameters as rolling friction coefficient, aerodynamic coefficient, switching line between throttle and brake control, brake efficiency factor and engine speed characteristics were identified by using least square method. A vehicle longitudinal dynamic model was calibrated by the acquired parameters; the validity of the proposed identification method was demonstrated by the perfect coincidence of experiment data and model output. 

Abstract:A method of lightweight about car body was developed based on the analysis of sensitivity and crashworthiness. First, the thickness of components on car body was used as design variables. The modal and stiffness of car body were the constraint. The weight of car body was the objective of optimization. The sensitivity of the thickness about modal and stiffness was obtained. Based on this sensitivity, the components whose thickness was not sensitive to modal and stiffness of car body were selected as the design variables. Using these design variables, the optimization design was carried out with the minimize weight of car body as objective. The result of optimization made 14.8kg weight reduction of car body, and guaranteed the performance of stiffness and modal. The simulations of side crash including whole car and occupant restraint system were carried out to the car after lightweight. The performance of crashworthiness and occupant restraint system was validated through comparing the results of before and after lightweight. In order to make the lightweight car body satisfied the requirement of crashworthiness, the thickness of components was modified again according to the results of side crash. The results showed the feasibility of the lightweight method based on sensitivity and side crash simulation.

Abstract:Hydrodynamic torque converters for passenger cars were designed with an increasingly narrower profile for the purpose of achieving smaller axial size that would cause the change of inner flow field and performances. Understanding the change rules under different flatness ratio could guide the design of flat torque converter. To investigate the change rules, four different flatness ratio torque converters were designed by means of bran-new flat torus design method and blade design method based on quadratic function distribution of momentum. Flatness ratio was also redefined, and then the change of flatness ratio can completely reflect the change of whole torus. The internal flow field of the flat torque converters was calculated by CFD software. The character of the flow field in pump, turbine and stator was analyzed in detail. Through the analysis, several valuable conclusions were educed. Based on the numerical solution, the performances of the flat torque converter were predicted. By comparing with the performances of different flatness ratio torque converters designed by same method, the influence of the flatness ratio of torque converter on hydrodynamic performance was found out.

Abstract:The black soil layers in the northeast of China undergo serious erosion. In order to seek an effective way to control soil and water loss in the area, the practical experiences in conservation tillage in the United States were introduced for analysis including the general situation of development, effects and challenges encountered. Popular modes there such as no tillage, strip tillage, zone tillage, vertical tillage, mulch tillage, and ridge tillage as well as the related implements were outlined. That is helpful for understanding conservation tillage itself, handling residue management, deep chiseling and pest or weed control. That may also serve as references while making reform and innovation of tillage modes and selecting tillage soil protection measures in the northeast of China.

Abstract:The subsoiler drawn by walking tractor was designed, and the orchard contrast experiment was carried out. The result showed that the soil bulk density was decreased; the soil porosity condition was improved; the water content in soil was enhanced within 1m layer; the soil organic matter and soil total nitrogen also enhanced after subsoiled. The subsoiler special for walking tractor as a new type of orchard soil management measures in Weibei area will has good prospects for promotion.

Abstract:A direct insert corn planting device with whole plastic-film mulching was designed on double ridges in dry land. The horizontal absolute velocity of hole-former was made zero at seeding time by using cam and crank combination mechanism to control it. The direct insert planting device was simulated to measure the hole-former’s displacement, velocity and acceleration, with the cam designed based on relative path curves in the ADAMS/View. The simulation results showed that the seeding device met the requirement of design. 

Abstract:2BFS-8 rice planting fertilizer machine was developed and it could level the paddy fields, open the furrow, form the ridge, sow, fertilize, press down the seeds and fertilizer simultaneously according to the requirement of rice planting. Seeds were drilled in the ridge and fertilizer was manured in the fertilizer ditch. Improved seed metering device could effectively prevent the clogging of rice seeds. The ditch system enabled the effective management of water and fertilizer to the paddy fields. Laboratory and field tests showed that this machine has fully reached the relevant national standards requirement.

Abstract:With the aim to solve the problem of seedlings damaged and inefficiency of plug seedlings transplanter, the end-effector was redesigned. According to the actual operational requirements, SolidWorks was used to design the virtual prototype of end-effector. COSMOSMotion was used to analysis trajectory of mechanical finger and COSMOSWorks was used to analysis finite element model of matrix. It showed in motion simulation experiment that the horizontal displacement of the mechanical fingers was mainly affected by the slider displacement (Δh)，while the vertical displacement was mainly affected by the initial angle (α) the mechanical fingers insert in. The forces generated by mechanical fingers distribute in the matrix block edge and won’t damage the seedling stems. The experimental results showed that the success rate of transplanter was 95.76%, the rate of seedlings damaging was 3.06%, and it could meet the operational requirements of transplanting.

Abstract:The fluorescent is usually used as tracers for spraying deposit analysis in pesticide application study. The recovery rate of the tracers is significant for a reasonable explanation of the spraying performance. Experimental scheme was designed in this work and fluorescent was used as tracers. The scheme comprised of a few spraying factors and different environmental conditions. Rhodamine WT and fluorescein sodium were used for the recovery rate tests and weather condition, shading rate, sampling times and sampler feathers were considered as constraints. The experiments shown, on the condition of the same shading rate, sampling times and samplers, recovery rate of Rohdamine WT was higher than fluorescein sodium. If sampling time was fixed with the same deposition carrier, the increase of shading rate would increase the recovery rate of fluorescent tracer. If shading rate and deposition carriers were kept same, the increase of sampling time would decrease the recovery rate of fluorescent tracers. On the condition of the same shading rate and sampling time, filter papers were more suitable deposition carrier comparing to silver papers.

Abstract:Reasonable configuration and optimization design of unit sprinkler system could take the advantages as maximizing efficiency of the unit and reducing the energy consumption. An optimization model was established and genetic algorithm was used to optimize light-small movable unit sprinkler system. The objective function was minimal energy consumption, the constraint conditions were pump and pipeline operating conditions, minimum working pressure of sprinkler, percentage of sprinkler working pressure range; and the decision variables were number of sprinkler, pipe diameter, sprinkler pressure in the pipeline end, respectively. The model and algorithms could optimize the number of sprinklers, pipe diameter and calculate out the flow rate, pressure, efficiency and per energy consumption of the unit. As well as the pump and pipeline could be ensured to operate in the optimized condition and the design parameters were met. An example showed that the energy consumption was reduced by 14.2% after optimum design. The algorithms can get the optimum results automatically when known conditions were input, having the advantages of excellent efficiency, accuracy, reliability, versatility and practicability.

Abstract:In order to analysis inner mechanical damage mechanism of soybean seed and the impact to its germination, three mechanical threshed soybean varieties mainly cultivated in Liaoning Province were selected. By means of stereomicroscope system and germination test, the inner mechanical damage impact to germination were tested, and the results showed that soybean seed germination ratio with inner mechanical damage was lower than 10%, main inner damage forms were devided into cotyledon break, cotyledon crack, radicle crack and hypocotyl break, which has remarkable latent harmfulness to soybean production. 

Abstract:Principle of coaxial differential threshing and it’s design schemer was proposed. Axial distribution curve and mathematical model of threshing mixture were established in the case of single speed threshing and differential speed threshing by means of Matlab on the basis of experiments. Results showed that grain total percentage of damage was 0.67%，the quantity of impurity with grain was 8.63% of total mixture quantity， the grain loss rate of unthreshed head and lined grain was 0.76%，which reduced by 40.9%, 29.5% and 32.15% of the single speed rotor. Differential threshing quality was better than single one. Coaxial differential threshing units integrated with the beneficial effects of high-speed threshing and slow-speed threshing, which could reduce grain loss rate, damage rate, impurity rate of three performance indicators synchronously and achieve better level.

Abstract:A pendulum impact cutting test-rig and a cutting force measurement system composed of a cantilever weigh sensor and a high speed analog acquisition card were developed. Then cutting mechanical property experiments of super rice stalk were carried out. According to the measuring cutting force, the cutting power consumption of different super rice stalk were calculated, and the influence of cutting speed, cutting position and parting cutter on the cutting force and consumption were analyzed. The results indicated slight decreasing tendency of cutting force with the increasing of cutting position. The peak cutting force and the cutting power consumption nearly linear increased with the increasing of cutting sectional area, but both decreased gradually with the increasing of cutting speed. The peak cutting force of different single super rice stalks could reach 24~32N. 

Abstract:2%。In order to solve the problem of lacking rape windrower in our country, 4SY-2 rape windrower was designed. The parameters of key components, such as the reel spoke, the cutting device, the conveyer and making swath device etc. were analyzed and confirmed. Experimental results showed that this machine had lower loss rate. The quality of swath could meet the requirements of the agronomy.

Abstract:Because of variety of cotton row spacing, there were some problems on cotton stalk pulling machine such as smaller using scope, lower efficiency and function singleness etc. In order to solve the problems，a new cotton stalk pulling head with regardless of row which could rearrange cotton and separate soil was designed. The whole structure and operating principles of the pulling head were introduced, and the critical components were designed by theoretical analysis and calculations. The main performance indexes of a prototype were measured by field tests. The results indicated that production coefficient was0.8hm2/h and pulling rate was 97.7%, when rotational speed of the pulling roller was 502r/min and advance speed was 0.93m/s, and all main parameter indexes reached their design requirements.

Abstract:Based on the Drucker-Prager yield criterion and finite element method, the contact mathematical model was established on wheat and a type of cone-shaped steel-sheet silo. These requirements on the contact surface were solved of the displacement conditions, the pressure transfer and the relations between the pressure and the displacement. Through establishing solving equations and calculation procedures, the reliable results were offered, using Lagrange’s method of multiplier and penalty function method. The results showed that the contact friction stress was small and associated with the contact state. The total contact stress was mainly contact pressure which was increased gradually from the top to the bottom of the silo and showed itself a non-linear relationship.

Abstract:The evaluation of man-machine interface for the cab of a combine harvester often involves some factors that are qualitative, lacks of available information and can only be assessed by human judgments, which inevitably involve various kinds of uncertainties and incompleteness. In view of this, an evaluation method combined the evidential reasoning approach with fuzzy membership degree was proposed to build the evaluation model for the man-machine interface of a combine harvester cab, which overcame the defects of handling information with uncertainty and incompleteness. Man-machine interface element can be assessed to a grade interval if it cannot be precisely assessed to only one grade. The introduction of utility function simplified the process of alternative ranking and decision. Applied example showed that this method could handle uncertain information effectively and the representation of results was much more coincident with people’s habit to deal with uncertain information than other methods.

Abstract:Ten types of biomass pellet fuels from China and Sweden were analyzed according to European solid biofuel standards (CEN/TC 335), and the differences in characteristics were analyzed between straw pellet fuel in China and wood pellet fuel from Sweden. The results showed that the biomass pellet fuels from China and Sweden satisfied the standard requirement and the wood pellets from Sweden had highest quality. The calorific value of pellet made from corn straw in China was 209% lower and the Si content was 20% higher in the ash and slag after combustion than that of Swedish wood pellets. This indicated that the biomass pellet fuels from China have more ash and more easily form slag during combustion. “Chinese” crop pellets with higher ash content and increased risk for slagging will require high quality combustion equipment to ensure high availability.

Abstract:The biodiesel was synthesized via transesterification from xanthoceras sorblfolia bunge seed oil and cottonseed oil produced in Xinjiang. Fatty acid methyl ester from biodiesel was analyzed by GC/MS technique. Their fuel properties were also tested and compared with the standards of diesel fuel and biodiesel produced in Europe and America. The influence of the structure and content of esters on fuel properties were analyzed. The results showed that xanthoceras sorblfolia bunge seed oil was better than cottonseed oil as resources.

Abstract:To develop a draft tube spouted bed (DTSB) for gasification of straw with coal, flow characteristics of the mixture in DTSB before co-gasificating should be studied to get the spouting conditions. The relationship of pressure drop of the bed with superficial air velocity was analyzed, as well as the effects of various parameters such as proportion of mixture, jet diameter and draft tube jet distance (DTJD) on it and the relationship of the circulating rate of the mixture with superficial air velocity. Three regression equations were got by U12(123) uniform design experiments and multiple variable linear regression using SPSS. The dependent in these equations’s was circulating rate of the mixture, pressure drop of unit material height, circulating rate of the mixture of per effective power respectively and the independents were all of proportion of mixture, spout diameter and DTJD. Three equations can be used to forecast hydrodynamic parameters of the mixture in the DTSB.

Abstract:With the problem that low fiber utilization in the alcohol process from maize straw，the influence of extrusion system parameters on fiber content of maize straw (cellulose, hemicellulose and lignin) through square combination experiment of five factors and five levels with orthogonal rotation by the single extruder，these parameters include the nozzle’s gap(B), distance(δ) between screw end and internal surface of die, the temperature(Τ) of sleeve, the screw speed(N) and straw moisture(W). The optimum values of parameters of extrusion system were put out. They were as follows: B=4 mm，δ=5 mm，T=120℃，N=90r/min，W=20%, and on the optimus parameters, fiber content of maize straw were follows: cellulose content is 3511%, hemicellulose content is 31.83%, lignin content is 6.77%. If the parameters of extrusion system were selected reasonably, the test results could provided certain reference for extruding pretreatment process of producing alcohol by straw fiber. 

Abstract:The relationships between thermal conductivities and soluble solid contents, water contents, temperature, density and hardness of 30 types fruits and vegetables were studied by the tepid probe test system. A BP artificial neural network model was presented and optimized for the prediction of thermal conductivities of fruits and vegetables according to the error analysis. The result showed that the optimal model was able to predict thermal conductivity with a mean relative error of 1.11%, a mean absolute error of 0.0057W/(m?K). The model can be incorporated in heat transfer calculations during fruits and vegetables processing. 

Abstract:1.08d。Computed tomography（CT） images and histograms scanned of Fushi apples in different storage time were compared and analyzed. It’s found that the images were getting brighter with the storage time increased and the right peaks of the histogram were moving right. The average gray value of the CT images was calculate to design a simple and fast image processing algorithm. The linear relationship was established between the average gray value and the storage time. The prediction error of the model was low and the average prediction error was 1.08d. 

Abstract:1～3℃。Freeze-drying microscopy (FDM) was used to investigate the critical temperature (Tcr) of sublimation interface during freeze-drying of binary aqueous solutions, and differential scanning calorimetry (DSC) was used to investigate the eutectic melting temperature (Tem) and the glass transition temperature of the maximally freeze concentrated solution (T′g). The experimental results showed that if a solute crystallized from solution during freezing step, the critical temperature was the eutectic melting temperature, or else a meltback would occur. If the solute remained amorphous during the freezing process, the critical temperature was the collapse temperature, or else the amorphous phase would undergo viscous flow. For 5% Sucrose, 10% glucose, 10% maltose, 10% PVP binary aqueous solutions, the microcollapse temperature (Tmc) and the collapse temperature (Tc) differed by less than 2℃, and Tmc was 1～3℃ above T′g.

Abstract:In determination of soluble solids content (SSC) in pear by FT-NIR spectroscopy technique, in order to improve precision and robustness, interval partial least square coupled with genetic algorithm (iPLS-GA) was used to select the efficient spectral regions and variables in calibrating model. Selections of spectral regions and variables were implemented by the cross-validation. The performance of the final model was evaluated according to the root mean square error of prediction (RMSEP) and correlation coefficient (Rp) in prediction sets. The results of final model were achieved as follow: the optimal iPLS-GA model was obtained with 10 PLS factors, when 5 spectral regions and 50 variables were selected, respectively. Rp and RMSEP of optimal model was 0.9398 and 0.3250 respectively by a prediction set. This work demonstrated that NIR spectroscopy with iPLS-GA could be applied successfully to determine the SSC in pear as a precise and nondestructive method. 

Abstract:Near-infrared (NIR) spectroscopy was used to measure trace chemicals, which could be useful for detection of pesticide residue in vegetable. Filter paper was used as the substrate. Pesticide solution was prepared by dissolving the commercial pesticide into distilled water at different concentrations. Samples were prepared by pipetting the solution onto the filter paper and then evaporated by vacuum drying oven. Then the spectra of samples were acquired in the region of 4000cm-1 to 10000cm-1 by NIR spectrometer. Partial least squares regression (PLSR) method and optimal band difference regression (OBDR) were used to establish prediction models respectively. Prediction results indicated that the PLSR models were able to predict the concentration of chlorpyrifos with 0.954 as the correlation coefficient of validation set, the OBDR models gave the best performance with 0.904 as the correlation coefficient of validation set. It could be concluded that NIR determination of pesticide was a low cost, environment friendly and potential method compare to the traditional methods. 

Abstract:Pure milks, such as Yili，Xinxiwang，Meilijian，Mengniu and Guangming, were selected and detected by an electronic tongue. The results of one-way analysis of variance showed that brands had a very obvious effect on sensors signals of pure milks. Sensors array was optimized by removing sensors variable of small F and R2. Principal component analysis(PCA) was applied to original data and optimized data(without BA sensor; without BA,BB sensors; without BA,BB,HA sensors; without BA,BB,HA,GA sensors). Results indicated that the optimized data without BA,BB,HA,GA sensors was more effective than the other data in distinguishing the brands of pure milks. Stepwise discriminant analysis was used to recognize，the identification rates of all data in the calibration sets were 100%. In the prediction sets，the identification rates of optimized data without BA,BB,HA,GA sensors and without BA sensor were both 90%，but the optimized data without BA,BB,HA,GA sensors only included three sensors variables and showed the best identification effects on the brands of pure milks. One-way analysis of variance could optimize the sensors array of electronic tongue by removing unremarkable sensor signals and improve the recognition performance of electronic tongue. 

Abstract:The effect of pectinase processing parameters, including enzyme dosage, hydrolysis temperature and hydrolysis time, for apple juice on its sensory quality and aroma component was conducted using response surface methodology. The results show that enzyme hydrolysis time and dosage had a significant effect on the sensory quality of apple juice (P＜0.01). The influencing sequence from high to low are as follows: enzyme hydrolysis time, enzyme dosage, enzyme hydrolysis temperature. In conclusion, we recommended that the optimum pectinase processing parameter for apple juice is 0.04g/L pectinase at 47.5℃ for 2.77h. Moreover, we constructed a regression model between the main aroma components of apple juice, esters, alcohols, acids, aldehydes and ketones, and processing parameters by headspace solid-phase micro-extraction method and multiple regression analysis.

Abstract:The open-ended coaxial technology was used to measure microwave dielectric properties and quality indices of heated mixed edible oil at 120～240℃ for 3～15h over the frequency range from 200 to 4500MHz. Results showed that, without high-temperature heating, the relative dielectric constant and loss factor of the oil would change with frequency, but kept constant generally when the oil was heated. The dielectric constant of heated oil was lower and the loss factor was higher than that of unheated oil. The high-temperature and heating time had small effect on permittivities. When the temperature was higher than 180℃, the acid value increased with heating time, but the time had obvious effect to peroxide value when the temperature was 120℃.

Abstract:The starch degradation process extruded at low temperature rice beer adjunct with enzyme preparation added in extruder and the influence regularity of main parameters in rice beer adjunct with added high temperature resistant α-amylase extruded at low temperature on main observed indexes for extruded rice adjunct with above amylase added were analyzed. The research results at the beer brewery indicated that the recoverable ratio of wort extract for extruded rice adjunct with enzyme preparation added was 2.10%~3.57% more than that of traditional rice adjunct without extruded and the rice beer adjunct with added enzyme preparation extruded at low temperature was not agglomerated in the water when mashed. Meanwhile the working procedure of traditional beer adjunct boiled at 100℃ was omitted. 

Abstract:23.7%。In order to enhance the alcohol yield of Saccharomyces cerevisiae DJ02, the preliminary fermentation conditions were optimized by single factor test. The results indicated that the fermentation conditions were: agar volume 80mL, inoculum concentration 11%, initial pH value 5.5, temperature 20℃, fermentation time 8d. The influence of twenty kinds of Chinese herbs, such as Pericarpium citri reticulatae, as promoting factors on the alcohol yield of Saccharomyces cerevisiae DJ02 was investigated. The influence of six kinds of Chinese herbs including Amomum villosum Lour on the alcohol yield of Saccharomyces cerevisiae DJ02 were significant. The optimum fermentation conditions were determined by plackettBurman design and response surface analysis. The optimum level of these fermentation conditions were: temperature 22℃, culture volume 75.0mL, pH value 5.71, fermentation time 8d, Amomum villosum Lour concentration 1.0%. The alcohol yield of Saccharomyces cerevisiae DJ02 was 16.92%, which was enhanced 23.7%. 

Abstract:Aluminum oxide (AlxOy) films were deposited on the polyethylene terephthalate (PET) foils as barrier coatings using conventional DC magnetron sputtering, in which argon, oxygen and pure aluminum were used as a sputtering gas, reaction gas and target, respectively. The influences of oxygen and argon flux ratios on the surface morphology, stoichiometry and structure of AlxOy films were investigated. The mechanic and barrier properties of AlxOy/PET were discussed, too. Fourier transform infrared spectrum (FTIR) and X-ray photoelectron spectroscopy (XPS) investigations indicated that a strong relation between oxygen addition and compositions of AlxOy films, the aluminum oxide IR spectrum’s peak value, the intensity and the band width. Also, the Al—O expansion vibration peak’s wave number was proportional to the oxygen atom content in AlxOy. The studies about films barrier and mechanical characteristics demonstrated when the ratio of y and x in AlxOy film was closer to 1.5, the barrier property was better and horizontal, vertical elastic modulus and yield strength were greater. In addition, the mechanical characteristics of AlxOy/PET films significantly changed as the films were stretched, there were two significant turning points in stress-strained curve. 

Abstract:。A vacuum suction device was developed to separate aimed tomato fruit from cluster in robotic harvesting，which took a mini air pump and a vacuum ejector as vacuum generation. Control strategy to this device was designed based on relationship between air supply pressure and vacuum pressure, pull-off force of the suction cup, and suction responding time. Experiments indicated that average time of one task and air consumption of this device were 1.5s and 0.6L, respectively. Success rate pulling fruit to reach horizontal 35mm far distance was 92%. Power of the mini air pump could satisfy the need of fulfilling 360 fruits harvesting per hour.

Abstract:In view of the shortages of traditional agro-meteorological observations and current automatic collecting techniques based on the sensors, an automatic collecting system of agro-meteorology information was built based on remote monitoring technique. Its total devices were composed of collecting front of the field microclimate, collecting front of the video, data collecting device, data transmission device and power equipment. The system highly integrated collection and transmission of the field microclimate data and video information, and automatically collected precipitation, air temperature, air humidity, wind speed, wind direction, photosynthetic active radiation, soil temperature, soil moisture and crop video information. The remote client software could achieve a real-time dynamic display and remote monitoring for all information. The test in Zhengzhou, Hebi, Wenjiang and Jingzhou stations showed that the system had a good performance in automatic collection, integrated transmission, real-time dynamic display and remote monitoring. It provided the basis for automatic identification, disasters information extracting and even crop yields estimation.

Abstract:Spatial correlation of wheat yield and yield pattern changes under two weather scenarios had been analyzed using Moran’s I and LISA. The results indicated there were most significant spatial autocorrelations among different yield patterns. Statistically, wheat yields were highly spatially correlated in cold years. With global and local spatial statistics, LISA map of yield differences in two weather patterns, stable and unstable yield areas were identified. Most significant spatial autocorrelations had been found in the northeast, west and south region. The northeast and west region of the field tended to be unstable, while the south region tended to be stable between different weather patterns. 

Abstract:The egg crack detection is one of the most important parts in the non-destructive detection of egg. The non-destructive testing parameters related the egg’s external conventional cracks, the external minimal cracks and internal cracks were extracted through image analysis, impact excitation frequency analysis and electronic nose pattern recognition respectively. A non-destructive testing criterion was designed according to the eggs cracks based on experimental research. The criterion was used to build the ‘one-to-many support vector discriminated model in eggs crack combined with experiment data. Performance parameters of the model (the model fitting degree was 0.9735, the convergence error was less than 0.0001) and the confirmatory test (the discriminated accuracy in the five cracks status was more than 90%) indicates that the model has credible structure and good discriminated ability.

Abstract:94.118%、91.522%。To achieve machine intelligence cutting of effective sugarcane kinds of fragments with sugarcane bud，machine vision was introduced to identify sugarcane nodes. Through acquiring the S component of HSV color space by threshold, mathematical morphology filtering as template and the anti-phase image of the H-component by threshold was added to get synthesized image. Synthetic image was divided into 64 regions and obtained seven characteristic indicators, such as centroid ratio, roughness ratio and white point ratio, and so on. Then support vector machine was introduced to identify sugarcane nodes and sugarcane internodes. The average recognition rate of sugarcane nodes between internodes was 93.359%. Clustering analysis was introduced to identify sugarcane nodes blocks which were got by support vector machine (SVM) classification. The average recognition rates of the sugarcane numbers and the sugarcane nodes position were 94.118% and 91.522% respectively.

Abstract:The tree image mosaicing was analyzed by template extraction and featured matching point searching. The template was obtained through tree image segmentation, image grey processing and image gradient processing. Then the matching featured point was searched and determined by similarity measure evaluation. With the relationship between template radius and the success rate of mosaicing, the relationship between template radius and the mosaicing of time, the success rate of 94.9% and 174ms each time were achieved. A tree image real time mosaicing was provided for expanding the field-of-view in precision pesticide target-oriented-spraying technique.

Abstract:Based on the dynamic model of single-mass nonlinear vibration machine which driven by dual motors, the phase-difference state space equations of dual exciting motors were deduced. Under systemic sharp resonance conditions (frequency ratio was 0.95~1.05), the nonlinear variable structure synchronization controller was designed, and the parameters of the synchronization controller were deduced by theoretical method. The results of numerical simulation showed that, using the variable structure synchronization control strategy to make the dual exciting motors realized the control synchronization motion have more dominance than the traditional PID synchronization control strategy which widely used in industry control field. The variable structure control synchronization strategy could effectively improve the performance of synchronization for dual exciting motors by reduce the synchronization error which caused by the performance difference of motors, exterior disturbance and so on. It could also improve the vibrating characteristics of nonlinear system. 

Abstract:Two individual components in a signal with frequencies within an octave usually can’t be decomposed by normal empirical mode decomposition (EMD) method. In order to improve the frequency resolution, an improved method based on frequency heterodyne EMD was presented. The proposed method enlarged the frequency difference of components to reach the identifying level of EMD. Moreover, the frequencies of components can’t be turnover with the frequency heterodyne EMD method. The applications in backlash nonlinearity system analysis and rotor complex fault diagnosis showed that the proposed method could improve the resolution of EMD with high accuracy and proved to be feasible.

Abstract:To reveal the effect of working oil temperature rise on hydro-viscous drive speed regulating start, by using finite element method, the modified transient Reynolds equation, energy equation and temperature-viscosity equation were solved simultaneously to simulate the startup process. The results showed that the oil film temperature rise caused by the friction pair approximately was 20℃ when inlet temperature of the working oil was 30℃, the decrease of oil film load capacity was about 9%. If inlet temperature of the working oil rised from 30℃ to 50℃, the oil film load capacity decreased by 32% even if the temperature rise caused by the friction pair was neglected. It could make oil film load capacity lower than the dead zone pressure of the proportional pressure valve used in the control system, thus the friction discs were engaged directly and could not get a perfect speed regulating start. The results were verified by experiments.

Abstract:Based on the motion relation between grinding wheel and gear in the process of helical-gear form grinding, the mathematical model of the helical-gear form grinding was established. The theoretical profile of the grinding wheel had been obtained by deducing the contact condition equations between the grinding wheel and the tooth face to be ground. The equidistant curve of the profile of grinding wheel was deduced to meet the need for dressing the grinding wheel by means of diamond wheel. The grinding wheel dressing software and numerical simulation software were developed, which could be used to dress the form grinding wheels with arbitrary helical-gear parameters and test the wheel dressing accuracy. Helical-gear grinding experiments showed that the dressing theory was correct and the dressing software was feasible.

Abstract:A mechanics model of multi-point die that contained complicate multi-contact surfaces was built by elastic-plastic finite element method, different materials with different thickness and deformations of spherical surface parts were simulated during the forming process, the variation histories of maximal contact forces of punches and their correlative factor were analyzed. The results indicated that the contact forces of punches became larger and larger along with the increase forming forces, when the elastic modulus and yield strength of material were bigger, the thickness and deformations of parts were also bigger. 