为解决汽车加速时驾驶室内的异响,建立了发动机-离合器-变速器-传动系统-整车的三自由度非线性力学模型。由于模型主要用于分析离合器减振特性的分析,将离合器输出轴以后的部件简化为一个等效转动惯量。在发动机输出扭矩的波动下,利用建立的模型,可以求出离合器输入、输出转速的波动,从而得到离合器的扭转振动衰减率。以离合器的振动衰减率最大为优化目标,优化了离合器的扭转刚度和摩擦阻尼,使其扭转振动衰减率得到了较大的增加。对优化前后的离合器进行装车试验,测试了发动机舱的噪声、车内的噪声和变速器支架的振动加速度。结果表明,本文的建立的优化模型和计算得到的优化结果,对改善变速器加速异响具有指导意义。
Abstract
The purpose of the model is to analyze the performance of torsional vibration reduction for a clutch based on trouble shooting for reducing abnormal noise during vehicle accelerating. The input and output rotational speed of a clutch can be calculated using the developed model if the torque fluctuation of the flywheel is assumed, so the isolation for torsional vibration of a clutch can be estimated directly. An abnormal noise at the cabin for a passenger car is perceived at accelerating of a car with 3 gear WOT and the engine speed is at the range of 1700 rpm to 2500rpm. To reduce the noise, an optimization model is presented by maximizing the isolation of a clutch at the rotational speed of 1700 rpm to 2500rpm, and taking the torsional stiffness and damping of a clutch as design variables. After installing the optimized clutch in the car, the noise at the engine compartment and at the cabin and vibration at the bracket of transmission mount is measured and compared with that using original clutch. The experiment demonstrates that the noise and vibration are reduced greatly with the optimized clutch, which validates the proposed model and calculated results.
关键词
加速异响 /
离合器 /
发动机舱噪声 /
变速器支架振动。
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Key words
Abnormal noise during car accelerating /
Clutch /
Noise at engine compartment /
Vibration of transmission bracket
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参考文献
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脚注
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