Zhongming Xu

Chongqing University

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i-10 index

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Zhifei Zhang

Chongqing University

Yansong He

Chongqing University

Ming Zan

Chongqing University

Linsen Huang

Chongqing Technology and Business University

Shu Li

China Medical University

Zhang Zhifei

China University of Mining and Technology

Zhigang Chu

Chongqing University

Ping Huang

South China University of Technology

Zhonghua Tang

Northeast Forestry University

Weichun Fan

Chongqing University

Cooperative Institutions

Chinese Academy of Sciences

Chongqing University

University of Chinese Academy of Sciences

Shanghai Jiao Tong University

Huazhong University of Science and Technology

University of Science and Technology of China

Chinese Academy of Medical Sciences & Peking Union Medical College

Peking University

Sun Yat-sen University

Shandong University

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Simulation of Ride Comfort for Motorcycle Based On MATLAB

Jisuanji fangzhen (2006)

Zhongming Xu

The ride comfort of motorcycle not only affects the comfort and fatigue of driver,but also affects the safety of running motorcycle.On the basis of establishing the dynamic model of five DOF of motorcycle,this paper derives the differential equation of vibration,designs a set of algorithms,and draws up simulation calculating programs by using MATLAB.The simulation of ride comfort of motorcycle was carried out on a certain nation-made motorcycle under the circumstance of considering both the road random profile inputs and engine impulses.Furthermore,the running test of motorcycle on road is done,the vibration comfort of driver seat is measured.Through the comparative analysis of experiment results,it has proved that the established model is able to reflect the vibration of the motorcycle better.

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Dynamic functional connectivity correlates of mental workload

Cognitive Neurodynamics (2024)

Zhongming Xu Jing Huang Chuancai Liu Qiankun Zhang Heng Gu

Closeness

10.1007/s11571-024-10101-4

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Path analysis for the factors of influence on yield of assembly

Journal of Suzhou University (2004)

Zhongming Xu

We proposed the path analysis method to analysis the data of assembly in industry. The results show that the main source of assembly's yield is the coat, part I/O, lead pitch, component height and we can improve the yield on the basis of the results.

Basis (linear algebra)

Component (thermodynamics)

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Functional delay and sum beamforming for three-dimensional acoustic source identification with solid spherical arrays

Journal of Sound and Vibration (2016)

Yang Yang Zhigang Chu Linbang Shen Zhongming Xu

Identification

Planar array

10.1016/j.jsv.2016.03.024

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Citations (31)

Modeling and Simulation of Vehicle’s Dynamic Stability Control on Combined Steering and Braking Maneuvers

Jisuanji fangzhen (2009)

Zhongming Xu

Eight degrees of freedom vehicle model was established in Matlab/Simlink.In order to control vehicle stability under turning braking,four control methods,ABS control algorithm based on the slip rate,the direct yaw torque control algorithms based on control objective of sideslip angle and yaw rate respectively,the direct yaw torque control algorithm base on control objective of weighted sideslip angle and yaw rate,were proposed with fuzzy control strategy.The vehicle turning braking stability was simulated by computer.The turning braking stability was judged by the stability judging formula.The results show that ABS can not meet the demand of the turning braking stability,but the direct yaw torque control algorithm based on control objective of weighted sideslip angle and yaw rate can satisfy the vehicle turning braking stability.

Yaw

Electronic stability control

Threshold braking

Automobile handling

Slip angle

Dynamic braking

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Spacing Policies for Adaptive Cruise Control: A Survey

IEEE Access (2020)

Cunxue Wu Zhongming Xu Yang Liu Chunyun Fu Kuining Li

Adaptive cruise control (ACC) systems are designed to provide longitudinal assistance for drivers to enhance safety and reduce workload. As the core of all ACC control algorithms, the spacing policy plays a crucial role in various aspects. This paper presents a comprehensive survey on spacing policies for existing ACC solutions in the literature. The objectives of this paper are to clarify the operating mechanisms and characteristics of the common spacing policies, and to reveal their advantages and shortcomings by means of a comparative study. In this survey, the general evaluation criteria for spacing policies are first introduced. Then, the existing spacing policies are categorized into different types according to their operating mechanisms, and their characteristics are carefully reviewed and explained. A comparative study is followed to analyze the performances of five typical spacing policies in the literature, including the constant spacing policy, constant time headway, traffic flow stability, constant safety factor and human driving behavior spacing policies. The contents provided in this paper serve as a tool for understanding current ACC spacing policies, and pave the way for future ACC enhancement.

Headway

Constant (computer programming)

10.1109/access.2020.2978244

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Citations (61)

Inverse Patch Transfer Function With Fast Iterative Shrinkage-Thresholding Algorithm as a Tool for Sparse Source Identification

IEEE Access (2020)

Lingyu Lou Zhongming Xu Linsen Huang Zhifei Zhang Yansong He

Inverse patch transfer functions (iPTF) method is an efficient technique for sound field reconstruction and separation of arbitrarily shaped sound sources in noisy acoustic environments. By applying Neumann boundary condition to a closed virtual cavity surrounding the source, the Helmholtz integral equation is simplified and can be solved with a Green's function satisfying the Neumann boundary condition. However, in the identification of sparsely distributed sources, ghost sources appear in the result solved by using the iPTF method with classic Tikhonov regularization methods and influence the accuracy of identification. In the present work, an evanescent Green's function with fast convergence of calculation is utilized, and a technique that combines the iPTF method and Fast Iterative Shrinkage-Thresholding Algorithm aimed at improving the performance for the identification of sparsely distributed source is proposed. Then double layer measurements, instead of using expensive p-u probes, are employed to acquire the normal velocity of the hologram surface. In numerical simulations, the normal velocities of two anti-phased piston sources are well reconstructed with high sparsity while a disturbing source is radiating in the sound field within the frequency band of 50 to 1000 Hz. Finally, an experiment on two baffled loudspeakers has been carried out. The results of simulations and experiments indicate that the proposed technique has obviously improved the accuracy of the iPTF method in the identification of sparsely distributed sources for the frequency band from 50 to 1000 Hz.

Shrinkage

Identification

10.1109/access.2020.2966304

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Resolution enhancement of two-dimensional grid-free compressive beamforming

The Journal of the Acoustical Society of America (2018)

Yang Yang Zhigang Chu Guoli Ping Zhongming Xu

Reconstructing the acoustic source distribution via imposing a sparsity constraint on a continuum, the atomic norm minimization (ANM) based grid-free compressive beamforming can eliminate the basis mismatch of conventional grid-based compressive beamforming. However, it works well only for sufficiently separated sources, which prohibits high resolution. The drawback arises because it uses an atomic norm to measure the source sparsity, while the atomic norm is not a direct sparse metric and its minimization is equivalent to the sparsity constraint only when the sources are sufficiently separated. This paper devotes itself to overcoming the drawback for the two-dimensional ANM based grid-free compressive beamforming. First, a sparse metric that can promote sparsity to a greater extent than the atomic norm is proposed. Then, using this metric a minimization problem is formulated and the majorization−minimization (MM) solving algorithm is introduced. MM iteratively conducts atomic norm minimization with a sound reweighting strategy, and therefore the developed method can be termed as iterative reweighted atomic norm minimization (IRANM). Both simulations and experiments demonstrate that whether a standard uniform rectangular array or a non-uniform array constituted by a small number of microphones is utilized, IRANM can overcome the drawback and thus enhance the resolution.

Minification

10.1121/1.5042239

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Functional Generalized Inverse Beamforming Based on the Double-Layer Microphone Array Applied to Separate the Sound Sources

Journal of vibration and acoustics (2015)

Shu Li Zhongming Xu Yansong He Zhifei Zhang Shaoyu Song

Beamforming based on microphone array measurements is a popular method for identifying sound sources. However, beamforming has many limitations that limit their precision. These limitations are addressed in research. To separate the contributions which come from two sides of the microphone array more accurately, an innovative beamforming method based on a double-layer microphone array, called functional generalized inverse beamforming (FGIB), is proposed to improve beamforming performance. This method, which involves the use of a priori beamforming regularization matrix and a matrix function to redefine the inverse problem, is combined with the advantages of both generalized inverse beamforming (GIB) and functional beamforming. Compared with GIB, with reduced iterations, the computational efficiency of FGIB is greatly improved. The dynamic range of the proposed method can be modestly improved as order v increases. Furthermore, the sidelobes gradually disappear and the mainlobes become narrower. Both simulations and experiments have shown that the sources are correctly located and separated. The proposed FGIB demonstrates the good performance when compared to other beamforming methods in terms of resolution and sidelobes level.

10.1115/1.4032305

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Finite element analysis and improvement of forging mould for crankshaft

Duanya jishu (2008)

Zhongming Xu

The finite element method was used to analysis the stress in the forging mould of crankshaft blank to solve the long existed problem of the forging mould short working life.A combined structure forging mould was designed and the parameters were determined according to the results of the analysis.The working life of the combined structure mould was several times longer than the original mould.It indicates that the improvement of the mould structure is significant and it is important to use the finite element method in mould design.

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