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IEEE Sensors

作者： Jiangkun Sun Yulie Wu Xiang Xi Yongmeng Zhang Xuezhong Wu Luozhen Qu College of Mechatronics Engineering and Automation National University of Defense Technology Changsha China

ISBN: (纸本)9781509010134

Damping asymmetry is one of the major sources which result in the gyroscope's drift. In this paper, the method of evaluating damping asymmetry by the Q factor circumferential distribution is proposed. The dynamic model of cylindrical resonator is established to analyze the Q factor circumferential distribution based on the amplitude-frequency response (AFR) analysis. Theoretical results shows that Q factors of the damping axes can be obtained from Q factor circumferential distribution under certain conditions when the frequency difference is relatively large. The Q factor circumferential distribution will be more close to the real Q factor distribution of resonators when the frequency difference is small enough. Besides, the Q factors of the damping axes are able to be acquired more easily. Experiments of amplitude-frequency response analysis are also set up to validate the theoretical results.

关键词： damping asymmetry amplitude-frequency response Q factor circumferential distribution frequency difference

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Analysis of Vibration Characteristics of the Cylindrical Shell Filled With the New Type of Lattice

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IOP Conference Series: Materials Science and engineering 2018年第3期394卷

作者： Changcheng Chen Guoxi Li Meng Zhang Weipeng Luo College of Mechatronics Engineering and Automation National University of Defense Technology Changsha 410073 China

Using the method of finite element simulation, we study the cylindrical shell filled with new lattice with vibration in the working environment. The effect of the radius of the rod and the thickness of the ring on the natural mode shape of the lattice-filled cylindrical shell is analyzed. The results show that the change of the rod radius and the ring thickness can change the natural vibration mode of the cylindrical shell, in which the rod radius has greater influence and better effect. The research results have guiding significance for the use of cylindrical shell filled with this new type of lattice.

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The New Routine of Training college Students under the Framework of Medical Equipment Vocational Education Group

The New Routine of Training College Students under the Frame...

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2017 International Conference on Computer, Electronics and Communication engineering(CECE2017)

作者： Cheng-cheng FAN Xiao-dong ZHUANG Zhao-yan HU School of Medical Instrument Shanghai University of Medicine & Health Science Department of Automation College of Mechatronics Engineering and AutomationShanghai University

After the establishment of Shanghai University of Medical&Health Science, school of medical instrument staff is exploring the new modes of training medical equipment vocational education college students. The thesis dissects the keynotes of SUMHS's breeding medical equipment college students as well as analyzes the problem of developing higher vocational education, thus to take an example of holding "MINDRAY CUP" in the school of medical instrument for finally exploring a new routine of medical equipment vocational education.

关键词： Modern vocational education Vocational training School enterprise cooperation

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Adaptive Temporal Sampling for Real-time Human Action Recognition

Adaptive Temporal Sampling for Real-time Human Action Recogn...

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2016 IEEE Advanced Information Management,Communicates,Electronic and automation Control Conference(IMCEC 2016)

作者： Yang Li Qin Lu Wusheng Luo College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781509001668

A new temporal sampling method for human action recognition using depth maps is *** depth map frames are projected onto three orthogonal Cartesian planes respectively and the absolute difference between two successive projected ones is stacked to form the motion *** sub-action frame sequences are selected accordingly,which constructs Adaptive Temporal Sampling(ATS) descriptor,capturing the dynamic features of one *** order to represent the static features,the Depth Static Map(DSM) is adopted to constitute ATSDSM ***2-regularized collaborative representation classifier is *** developed approach is proven to be computationally efficient and the experimental results on the testing dataset outperform the state-of-the-art performance.

关键词： Human action recognition Depth Motion Maps Motion Energy Adaptive Temporal Sampling

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Adaptive Higher Order Sliding Mode Control for Uncertain MIMO Nonlinear Systems 35

Adaptive Higher Order Sliding Mode Control for Uncertain MIM...

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第35届中国控制会议

作者： Li Peng Ma Jianjun Geng Lina Zheng Zhiqiang College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781509009107

An adaptive multivariable fast higher order sliding mode control(HOSMC) scheme for a class of uncertain MIMO nonlinear systems is *** HOSMC is based on a switched finite-time control law for a chain of integrators,and fast convergence rate can be guaranteed even under large initial state errors *** additive uncertainty of the systems has a functional bound affine in the state *** on integral sliding surfaces,an adaptive fast HOSMC strategy is ***,the bounds of the uncertainties are not needed in the procedure of the controller *** effectiveness of the proposed control scheme is illustrated through simulations.

关键词： Multivariable HOSMC adaptation fast finite-time control MIMO

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Research on the Influence of Track Periodic Short-Wave Irregularity on Low-Speed Maglev Train 35

Research on the Influence of Track Periodic Short-Wave Irreg...

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第35届中国控制会议

作者： Yu Pei-Chang Li Jie Wang Lian-Chun College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781509009107

The objective of this study is to investigate the influence of track short wavelength irregularity on low-speed maglev *** of all,the source of short-wave irregularity is discussed and the model of suspension module for the maglev train is ***,for the purpose of research,the train is simulated as a rigid car with 5 independent bogies which each consists two separated suspension *** order to find the optimal length and sensitive length of the irregularity wave for the suspension system,the suspension gap and cabin acceleration fluctuation is discussed based on the outputs of the train which is stimulated by different length of short-wave *** the further analysis,the system performance is discussed with the change of controller parameters and structure of levitation *** numerical simulation results show that the optimal length is beneficial to the performance of maglev train and is insensitive to the variation of the controller *** conclusions can be taken into consideration for the track manufacture and guideway construction for maglev train.

关键词： Maglev Train Acceleration Fluctuation Track Irregularity

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Three-Dimensional PN Law Design and Simulation of Non-Seeker Guided Bombs 35

Three-Dimensional PN Law Design and Simulation of Non-Seeker...

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第35届中国控制会议

作者： GUO Shuai GUO Hongwu HUANG Yanbo College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781509009107

Inpractice,in order to reduce the development costs,guided bombs sometimes do not install the seekers when aimed at the fixed ground *** accordance with this situation,this paper proposes a new three-dimensional proportion guidance(PN)law design to realize the guidance and control of the non-seeker guided *** the commonly used method of orthogonal plane in which the LOS rates are calculated respectively,this paper uses the position and velocity of bomb measured by the navigation system and the preset target information on the bomb to directly calculate the components of the LOS rate in the line-of-sight coordinate system(LCS) by the coordinate transformation,then calculates the required overload in the LCS by the vector form of the PN law,and finally realizes the guidance and control of the bomb by using the STT method and PI *** method in this paper is easy to calculate and *** the simulation shows the effectiveness of this method.

关键词： Guided Bomb Non-Seeker Three-Dimensional PN Law STT

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Research on distributed autonomous time reference maintain method of navigation constellation

Research on distributed autonomous time reference maintain m...

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第八届中国卫星导航学术年会

作者： Daoning Yang Gang Li Ying Liu Jun Yang Yinan Meng Xianyu Zhang College of Mechatronics Engineering and Automation National University of Defense Technology Beijing Institute of Tracking and Telecommunications Technology

ISBN: (纸本)9789811045936

Satellite navigation system to provide users with high-precision positioning, navigation and timing services, requires a uniform high-precision time *** the navigation system is operating in the normal mode, this reference is maintained by the ground and measured through the satellite-ground link and modify the on-board clock parameters to ensure the uniformity of the entire system time *** the autonomous navigation mode, the navigation constellation to leave the ground support, need to maintain the time reference *** paper analyzes the maintenance method of autonomous time reference based on inter-satellite observation and designs a distributed autonomous time reference maintenance *** satellite clock error is used as the basic observation to compose the system measurement *** to the system state equation, each satellite uses Kalman filter to estimate and update its own clock parameters to maintain the constellation time *** results show that the proposed algorithm can maintain the uniform time reference of navigation constellations.

关键词： Inter-satellite link time reference GNSS distributed method

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Research on the on orbit precision evaluation method of inter-satellite measurement based on geometry configuration

Research on the on orbit precision evaluation method of inte...

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第八届中国卫星导航学术年会

作者： Daoning Yang Jun Yang Gang Li Haojie Wang Ying Liu College of Mechatronics Engineering and Automation National University of Defense Technology Beijing Institute of Tracking and Telecommunications Technology

ISBN: (纸本)9789811045936

Navigation constellation inter-satellite link(ISL) is one of the efficient ways to improve the service performance of global navigation satellite system(GNSS).The four major GNSSs have been equipped with ISLs or plan to equip in near *** beam inter-satellite link in a time division multiple access(TDMA) system have advantages of fast beam switching, flexible networking, high communication speed and good *** navigation constellation to improve service performance, the measurement values have to transfer back to the ground facilities in a short time, at the same time, facilities have to transfer telecommand and uplink ephemeris to satellites which are invisible to ground facilities as soon as *** all made a request to shorter communication *** it is very important to improve the performance of ISLs by rapidly assessing the quality of the connection and adjusting the unreasonable connection in *** this paper, a communication time delay model for ISLs based on directed graphs is *** abstracting the ISL timeslot table into a directed graph, and based on the shortest path algorithm, the communication time delay can be obtained *** verifications have been carried out for different *** show that the proposed model works well.

关键词： inter-satellite-links geometry precision evaluation inter-satellite measurement GNSS

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Mitigating Thermoelastic Dissipation of Flexural Micromechanical Resonators by Decoupling Resonant Frequency from Thermal Relaxation Rate

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Physical Review Applied 2017年第6期8卷 064033-064033页

作者： Xin Zhou Dingbang Xiao Xuezhong Wu Qingsong Li Zhanqiang Hou Kaixuan He Yulie Wu College of Mechatronics Engineering and Automation National University of Defense Technology Changsha 410073 China East China Institute of Photo-Electronic IC Bengbu 233042 China

This paper reports an alternative design strategy to reduce thermoelastic dissipation (TED) for isothermal-mode micromechanical resonators. This involves hanging lumped masses on a frame structure to decouple the resonant frequency and the effective beamwidth of the resonators, which enables the separation of the thermal relaxation rate and frequency of vibration. This approach is validated using silicon-based micromechanical disklike resonators engineered to isolate TED. A threefold improvement in the quality factor and a tenfold improvement in the decay-time constant is demonstrated. This work proposes a solution for isothermal-mode (flexural) micromechanical resonators to effectively mitigate TED. Specifically, this approach is ideal for designing high-performance gyroscope resonators based on microelectromechanical systems (MEMS) technology. It may pave the way for the next generation inertial-grade MEMS gyroscope, which remains a great challenge and is very appealing.

关键词： Continuum mechanics Linear acoustics Metrology Organic sensors Ultrasonics Micromechanical devices Nanomechanical devices

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