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A radar antenna pedestal gear Vice dynamics

Author: ShengGuoLiang
Tutor: WangShuanHu；WangLiangYing
School: Nanjing University of Technology and Engineering
Course: Mechanical Engineering
Keywords: Gear drive Tooth side clearance Gear dynamics Clearance-type nonlinearity MATLAB Dynamic optimization
CLC: TH132.41
Type: Master's thesis
Year: 2008
Downloads: 181
Quote: 3
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Abstract


The gear drive is widely used in the radar antenna mounting transmission system,at present to high speed, low noise, the light quality, the precise direction is developing. Because of errors in makes, assembles and the gear drive process attrition, also inevitably creates the gap in the gear. As a result of the tooth side clearance existence, contact condition between the gear will be able to change when the gear drive, thus will cause the impact between the gear to contact, to depart, to contact again. The intense vibration, the noise and big dynamic load which will bring by the gap initiation impact, not only will affect the gear the life and the reliability, moreover influence radar servosystem pointing accuracy and stability.This article in view of the radar antenna mounting gear drive system characteristic and the influence transmission precision crucial target—tooth side clearance, has established the gear clearance non-linearity single degree of freedom mathematical model taking the radar antenna mounting gear drive system last stage gear as the object of study with the centralism quality method. Carries on the modelling simulation and solves using MATLAB/Simulink and four staging length of stride Runge-Kutta method to gear gap non-linear dynamics model through the massive value computation. and has carried out qualitative and quantitative analysis using the modern non-linear dynamics system analysis theory and the method to gear gap nonlinear system dynamics response characteristic in parameter change and so on the damping ratio, excitation frequency, excitation peak value. Specially this article has compared teeth side clearance change to the system non-linear dynamics response characteristic influence in the underloading and the heavy load two kind of operating mode. This will provide the theory basis for us on the reasonable design tooth side clearance in the later project practice.Simultaneously this article also take a radar antenna mounting gear drive system last stage pair of involute spur gear as the object of study, uses the simplification dynamics gear model of vibration to calculate the gear equivalent meshing rigidity, and take vibrates slightly as target to carry on the optimization by MATLAB toolbox of the fmincon function. the gear dynamic analysis and the optimized design organic synthesis, has realized truly the radar antenna mounting gear drive system dynamic optimized design.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > The transmission mechanism > Meshing > Gears and gearing
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