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您的检索式：作者名="JIN GuangHu"
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| 1 | Modeling and high-precision processing of the azimuth shift variation for spaceborne HRWS SAR显示文摘One basic assumption for high-efcient SAR imaging algorithms is azimuth-shift-invariance of SAR data.The new spaceborne high-resolution wide-swath(HRWS)SAR generation will retain the same signifcant swath depth of the past but will achieve much higher resolution.The formerly insignifcant variance of efective radar velocity along azimuth path will cause noticeable focusing blurring at azimuth scene edges.It is a new problem to accommodate the azimuth-shift variance with high efciency and high precision.In this paper,the azimuth variation of efective velocity and main influencing factors are analyzed and accurately modeled.A highly accurate and efcient phase preserving processor with embedded azimuth variance compensation for sliding spotlight mode is proposed.The proposed processor does not add extra computing load and inherits the high efciency of the original azimuth-invariant subaperture approach.Through careful design of the fourthorder phase terms of the processing functions,azimuth variation compensation can be achieved in company with the original baseband azimuth scaling steps.Simulation with point targets in C-band HRWS sliding spotlight mode is made to validate the focusing and phase preservation performance of the proposed algorithm. | HE Feng CHEN Qi DONG Zhen JIN GuangHu LIANG DianNong | 2013 | Science China(Information Sciences)2013，56，10： | 4 |
| 2 | Effect of Friction on Dynamic Response of A Power Split Transmission System显示文摘The tooth surface friction stiffness and friction torque coefficient equations of cylindrical gear are derived.On the basis of factors such as time varying friction coefficient and mesh stiffness,support stiffness,torsional stiffness and comprehensive error,the dynamic equations of the gear trains with bending torsional coupling are established.Using the Fourier series method,the total response of the system is obtained,and the influence of friction on it is analyzed.The results show that when the spur gear enters the meshing,the frictional amplitude of the tooth surface is larger than that of the gear when it is withdrawn from engagement,and the meshing force fluctuates greatly.The frictional force and dynamic meshing force of the herringbone gear tooth surface are relatively stable,and the fluctuation amplitude is much smaller than that of the spur gear.The amplitude of the bearing vibration is not affected by the friction,but the friction has a certain influence on the bearing force of the output shaft.The first order natural frequency of the split stage and the power confluence stage has a large influence on the vibration of the bearing force.In general,the natural frequency of the power confluence stage has a large proportion of influence. | JIN Guanghu YANG Haoyun LU Fengxia ZHU Rupeng | 2019 | Transactions of Nanjing University of Aeronautics and Astronautics2019，36，3： | 1 |
| 3 | Finite Element Modeling and Vibration Analysis of Sprag Clutch⁃Flexible Rotor System显示文摘To study the overall vibration characteristics of the sprag clutch⁃flexible rotor system(SC⁃FRS)under high⁃speed operating conditions,a finite element model of SC⁃FRS considering rotor flexibility and bearing support stiffness was established based on the proposed calculation method of the stiffness matrix.According to this model,the natural frequency and mode shape of the system are calculated,and the correctness of the model was verified by comparing it with the calculation results of ANSYS software.Under the action of unbalance,the bending⁃torsion coupled vibration and the dynamic load of the inter⁃shaft bearings were analyzed,and it is found that the resonant peak in the torsional direction has the same resonance frequency as that in the bending direction.A test rig for the sprag clutch⁃rotor system was built,and the axis trajectory and critical speed were tested.The test results show that the finite element model of SC⁃FRS can accurately describe the vibration characteristics of the system.The coupling vibration characteristics analysis of the sprag clutch⁃flexible rotor system can provide theoretical guidance for the dynamic design of the sprag clutch components. | Chuang Huang Yongqiang Zhao Guanghu Jin | 2022 | Journal of Harbin Institute of Technology(New Series)2022，29，2： | 0 |
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