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| 1 | Experimental Model and Analytic Solution for Real-time Observation of Vehicle's Additional Steer Angle显示文摘The current research of real-time observation for vehicle roll steer angle and compliance steer angle(both of them comprehensively referred as the additional steer angle in this paper) mainly employs the linear vehicle dynamic model, in which only the lateral acceleration of vehicle body is considered. The observation accuracy resorting to this method cannot meet the requirements of vehicle real-time stability control, especially under extreme driving conditions. The paper explores the solution resorting to experimental method. Firstly, a multi-body dynamic model of a passenger car is built based on the ADAMS/Car software, whose dynamic accuracy is verified by the same vehicle's roadway test data of steady static circular test. Based on this simulation platform, several influencing factors of additional steer angle under different driving conditions are quantitatively analyzed. Then ε-SVR algorithm is employed to build the additional steer angle prediction model, whose input vectors mainly include the sensor information of standard electronic stability control system(ESC). The method of typical slalom tests and FMVSS 126 tests are adopted to make simulation, train model and test model's generalization performance. The test result shows that the influence of lateral acceleration on additional steer angle is maximal(the magnitude up to 1°), followed by the longitudinal acceleration-deceleration and the road wave amplitude(the magnitude up to 0.3°). Moreover, both the prediction accuracy and the calculation real-time of the model can meet the control requirements of ESC. This research expands the accurate observation methods of the additional steer angle under extreme driving conditions. | ZHANG Xiaolong LI Liang PAN Deng CAO Chengmao SONG Jian | 2014 | Chinese Journal of Mechanical Engineering2014，27，2： | 3 |
| 2 | Experimental study on mechanical characteristics of nut rupturing under impact loading显示文摘The parameters of energy and power for nut rupturing play a key role in the design of shell-breaking equipment.However,currently,there is no scientifically accurate measuring method for these parameters.A mechanical nut testbed was developed to accurately measure the force,energy,and power and observe the generating process of nutshell cracking and breaking to reveal the shell-breaking mechanism.The system was tested with pecans and the results show that the testbed can effectively realize the determination of nuts performance and data acquisition and analysis.The methods and data can provide a theoretical guidance for the design and optimization of shell-breaking equipment and decrease kernel-breaking rate. | Cao Chengmao Sun Si Ding Ran Li Bing Wang Shuo | 2017 | International Journal of Agricultural and Biological Engineering2017，10，1： | 3 |
| 3 | Design and test of post-seat weeding machine for paddy显示文摘Aiming to solve problems in organic rice weeding a type of post-seat weeding machine was designed for rice paddies.The differences in the strengths and lengths of the root systems between the rice seedlings and the weeds were studied,and the motion track of the weeding wheel was analyzed to obtain the structural parameters of the weeding wheel.Then,the structural model of the weeding wheel was designed.The interaction process between the weeding wheel and soil in the paddy fields was simulated and analyzed based on the discrete element method,so as to investigate the working resistance change tendency of the weeding wheel and the orderliness of the soil disturbances.An orthogonal test was designed in this study,with three factors:the hoeing depth,the rotation rate of the weeding wheel,and the forward speed of the device.The influences of different operation parameters of the weeding machine on the weeding torque and soil disturbance speed were obtained based on a variance analysis of the test results.A multi-index comprehensive weighted scoring method was used to evaluate the simulation results.A soil bin test was conducted to verify the simulation results.Field experiments were carried out to test the working performance of the weeding machine.The comprehensive scoring results indicated that a better working performance of the weeding operation could be obtained when the hoeing depth was 50 mm,the rotation rate of the weeding wheel was 240 r/min,and the forward speed was 0.6 m/s.The results of the soil bin test were consistent with the simulation results.The results of the field experiment revealed that the weeding machine met the requirements for organic rice weeding.These results can provide a reference for the design of weeding machines for paddy fields. | Liang Tian Chengmao Cao Kuan Qin Liangfei Fang Jun Ge | 2021 | International Journal of Agricultural and Biological Engineering2021，14，3： | 1 |
| 4 | Design and experiment of vibration plate type camellia fruit picking machine显示文摘In order to solve the problem of high missed rate of camellia fruits and high damage rate of flower buds during vibratory picking,through the study on the biological characteristics of camellia tree,the crown of camellia tree was divided into upper and lower canopy at the maximum canopy diameter.A kind of vibration plate type camellia fruit picking machine was designed.The structure and working principle of the whole machine were described.Through the analysis of the factors of camellia fruit abscission,it is concluded that frequency,amplitude and working time are the main factors affecting the magnitude of inertia force.Through preliminary research and coupling simulation,the horizontal range of each factor is determined:operation time is 5 s,10 s,15 s,frequency is 3 Hz,5 Hz,7 Hz and amplitude is 50 mm,60 mm,70 mm.Orthogonal tests were carried out on the upper and lower canopies successively,and the comprehensive scoring method was used to analyze the orthogonal test results.The results showed that the optimal combination of working parameters for picking camellia in the upper canopy was A3B3C2,that is,the operation time was 15 s,the amplitude was 70 mm and the frequency was 5 Hz.Under this condition,the missed picking rate of camellia fruits was 8.21%and the rate of flower buds damage was 9.12%.The optimal combination of working parameters for picking camellia fruits in the lower canopy was A3B1C3,that is,the operation time was 15 s,the amplitude was 50 mm and the frequency was 7 Hz.Under this condition,the rate of missing picking of camellia fruits was 6.84%and the rate of flower buds damage was 6.92%. | Delin Wu Da Ding Bowen Cui Shan Jiang Enlong Zhao Yangyang Liu Chengmao Cao | 2022 | International Journal of Agricultural and Biological Engineering2022，15，4： | 1 |
| 5 | Entropy-like distance driven fuzzy clustering with local information constraints for image segmentation显示文摘To improve the anti-noise ability of fuzzy local information C-means clustering, a robust entropy-like distance driven fuzzy clustering with local information is proposed. This paper firstly uses Jensen-Shannon divergence to induce a symmetric entropy-like divergence. Then the root of entropy-like divergence is proved to be a distance measure, and it is applied to existing fuzzy C-means(FCM) clustering to obtain a new entropy-like divergence driven fuzzy clustering, meanwhile its convergence is strictly proved by Zangwill theorem. In the end, a robust fuzzy clustering by combing local information with entropy-like distance is constructed to segment image with noise. Experimental results show that the proposed algorithm has better segmentation accuracy and robustness against noise than existing state-of-the-art fuzzy clustering-related segmentation algorithm in the presence of noise. | Wu Chengmao Cao Zhuo | 2021 | The Journal of China Universities of Posts and Telecommunications2021，28，1： | 0 |
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