Papers by Keyword: Engineering Vehicle

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Authors: Bin Yang, Jing Wen Wang
Abstract: Wavelet transform was utilized in vibrant signal processing of air suspension system. A dynamic model of 1/4 engineering vehicle with air suspension system was established. Road surface signal of B grade was input to the dynamic model. Vibrant acceleration curve of under spring mass and dynamic load curve of air suspension was gained. Noise signal of under spring mass acceleration and dynamic load of air suspension system were filtrated by wavelet decomposition. Vibrant acceleration signal of under spring mass and dynamic load signal of air suspension were extracted by wavelet reconstruction. It can provide a theoretical foundation for identifying dynamic load of air suspension system.
Authors: Jun Qian, Yi Shan Zeng, Shu Wang Wang
Abstract: In order to verify a quick launching system for rockets with small and medium sizes, an engineering vehicle localization and navigation sub-system is presented in this article. The structure of the launcher includes the front board and two cylindrical landmarks on both sides. When the vehicle gets close to the launcher, two 2D laser scanners on the vehicle detect the launcher reliably. And an extend Kalman filter is used to estimate the vehicle’s pose relative to the launcher. The localization and navigation results show that the lateral positioning error is smaller than 1cm so that the vehicle could align with the launcher accurately.
Authors: Ying Shuang Zhang, Guo Qiang Wang, Ji Xin Wang, Li Juan Yang
Abstract: The load time history signal of engineering vehicle is usually polluted by various nonstationary and stationary noises in the field test. An approach based on wavelet transform (WT) and fractal dimension (FD) is proposed in order to improve the adaptability and efficiency of denoising. This method initially decomposes the original signal into detail and approximation space in the WT domain by WT-based multiresolution decomposition. The short-time fractal dimension of detail coefficient is calculated at each scale. After the application of the binary processing to the short-time fractal dimensions, the locations where the thresholding of the detail coefficients has to be executed are ensured. The desired load signal is provided by applying WT-based multiresolution reconstruction to the processed detail coefficients and the unprocessed approximation coefficients. The proposed method is applied to an actual load time history signal of engineering vehicle. And the performance of this method is compared with that of the WT-based hard thresholding denoising method. The results show that this method is an alternative way to process the load time history signal of engineering vehicle.
Authors: Yong Ming Bian, Jia Jiang, Xin Ming Xu, Li Jing Zhu, Fang Wei Zhao, Ben Jin
Abstract: The structure and control system of full electric driven loader after electrified modification are introduced firstly. The main technical parameters of the modified loader are described. The feasibility of the application and major programme of the FlexRay communication protocol in full electric driven loader are discussed. Finally, the corresponding designing and controlling schemes are given to the main controller and minor controller, the design plan for the control system of engineering vehicle is proposed, and the performance of the engineering vehicle using FlexRay is analyzed, which provide solid theory and experiment support for the FlexRay application in engineering vehicle.
Authors: Xiang Jun Yu, Ming Yao Yao
Abstract: A new Rollover Protective Structure (ROPS) of the large-scale wheel loader was designed based on a buffer-induced structure. Dynamic Finite Element analysis model of the entire vehicle was created and boundary conditions of typical rollover cases were given. Optimization design of this new ROPS was obtained through a comprehensive analysis of 16 dynamic simulation samples, which were designed by Orthogonal Experimental Method. Comparison analysis of dynamic response results between original ROPS and optimal new ROPS indicates that this new ROPS effectively prolonged the duration time of the first collision and reduced the acting time of peak force. Deformation extent of main structure of this new ROPS is significantly smaller than that of the original ROPS. Buffer-induced structures can increase the kinetic energy absorption capability of ROPS. Therefore, it can reduce the possibility of brittle fracture of ROPS and improve the probability of operator survival.
Authors: Ji Xin Wang, Xun Yang, Xiang Jun Yu
Abstract: According to the structural characteristic and the test requirement of tow-post ROPS, a nonlinear finite element model of ROPS based on large-strain shell element was established, and the influence of elastic-plastic deformation of ROPS was taken into consideration. Then the computer simulation of ROPS was performed in lateral loading case, which obtained the deformation mode and the distribution law of equivalent plastic stress of ROPS followed by the discussion of deformation mechanism of ROPS. The simulation results accorded with test results. This paper can provide theoretical basis for the structural design of two-post ROPS.
Authors: Jin Xin Chen, Jun Xun Zhang, Zai Xiang Zheng, Xue Dong Qi
Abstract: The engineering vehicle cab FOPS (falling-object protective structures) mainly contain two parts: top guard and front guard. According to the characteristics of the engineering vehicle cab security architectures, the simulation that top guard is impacted by the falling hammer is made by non-linear analysis software – LS-DYNA. The breakage phenomenon is also researched. The stiffness of the top guard is so weak that the hammer’s displacement is too large, which leads to the impact resistance of top guard is unqualified. Based on this, the cause of the stiffness insufficient is researched. By orthogonal experimental design for the dominant factors, it makes the simulation performance of the top guard meet the requirements of the national standard. On this basis, the simulation mechanical bearing capacity of the front guard is done by LS-DYNA, while the experimental research is also accomplished. By contrasting the result of simulation and experiment, it turns that simulative result coincides with the experimental well.
Authors: Zhong Yun Qiao, Fu Zhou Zhao
Abstract: Traditional energy saving methods for engineering vehicle cannot raise the effect on a large scale if there are no major technology breakthrough. Hybrid system has the potential of improving fuel economy by operating the engine in an optimum efficiency range and it has been successfully applied in engineering vehicles. So equipping engineering vehicle with the hybrid system provides a new way to achieve energy savings. Simulation results of vehicles based on backward modelling shows that the energy control strategy can achieve a variety of reasonable operating mode switching and meet the vehicle at power.
Authors: Yong Jing Huang, Jin Yao, Jia Hua Han, Di Wu
Abstract: By combining the powerful self-learning ability of the neural network and the characteristic that the fuzzy control is designed based on the strategical rules of knowledge and language, this paper put forward the strategy of engineering vehicles' automatic transmission shift. According to a large number of experimental data, as well as the drivers' experience and the experts' profession, this paper put forward the strategy of engineering vehicles’ automatic transmission shift. The neural network model is set up based on Takagi-Sugeno and the factual cases are used to train and exam by MATLB, the simulation result showed that this method is feasible and meet the shift requirement, as it can accelerate effectively the establishment of the rules and reduce the set up time. The shift schedule can reflect precisely the actual out put target gear and meet the shift requirement.
Authors: Ji Xin Wang, Xiao Bo Tang
Abstract: Signal processing is an important work of load spectrum generation, while wavelet denoise method is regarded as one of the best method in engineering signal processing. So on the purpose of obtaining a good load spectrum of engineering vehicles, db3 wavelet is selected as the mother wavelet. Then the denoise layer number was determined by some comparisons, as well as a proper threshold and threshold function algorithm. Finally a whole process in denoise of the load spectrum of a wheel loader, which is from the selection of the mother wavelet to the determination of the denoise layer number to the selection of the threshold algorithm and the threshold function algorithm, is depicted in this paper. A new coefficient is introduced and a satisfactory result is got. It is safe to conclude that wavelet denoise method is the relative best selection for load spectrum analysis of engineering vehicles.
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