基于動(dòng)力總成懸置系統(tǒng)優(yōu)化與仿真的車內(nèi)噪聲分析
[Abstract]:With the development of society, consumers are demanding for automobile quality, and good NVH performance is becoming more and more important. Excessive vibration and noise not only affect ride comfort, but also distract driver's attention, reduce the life of parts and affect driving safety. Engine vibration is an important source of vehicle vibration and noise. This excitation is transmitted to the frame and body through the powertrain mount system, which causes vibration and noise in the cab. In order to reduce the vibration transmitted to the frame and body, the vibration isolation performance of the powertrain mount system is particularly important. Emerging active, semi-active hydraulic mounting has excellent vibration isolation performance, but the cost is high. For the traditional rubber mounting and passive hydraulic mounting, the reasonable arrangement of the components and the matching of the parameters can affect the isolation performance of the mounting system, mainly reflected in whether the distribution of the natural frequency is reasonable and whether the decoupling performance is good or bad. In this paper, the decoupling performance of the powertrain mounting system is optimized by changing the stiffness and mounting angle of the mounting elements, and the optimization results are verified by combining the NVH performance forward development project of a domestic light truck. The main contents of the study are as follows: 1: 1. In theory preparation, the mechanism of engine vibration and the principle of mounting vibration isolation are deduced, and the function, arrangement requirement and layout mode of powertrain mount system are expounded. This paper puts forward the concept of decoupling, and introduces several main decoupling methods. The hammering test was carried out on the V-shaped bracket mounted after the powertrain, the natural frequency and the corresponding dynamic stiffness were obtained, the reliability of its performance was verified, and the modeling program was simplified. The natural frequency and mode shape of the sixth order mode are obtained by the modal test of the powertrain mount system, which is used as the basis for judging the model in the following work. The dynamic assembly is simplified as a rigid body with six degrees of freedom in space, and the torsion spring of the mounting element is ignored. The mechanical model of the mounting system of the assembly is established, and the concrete calculation formulas of natural frequency and decoupling rate are deduced and calculated by MATLAB. The accuracy of the mechanical model is verified by comparing the calculated natural frequency with the experimental results. The calculated decoupling rate is credible. 4. In the past, the three-way stiffness and installation angle of the rear mount were used as variables, and the optimization function in MATLAB was used to optimize the mounting system. On the premise that the decoupling rate of Bounce motion is close to 80%, the decoupling rate of Roll motion is more than 90. 5. The model of powertrain mount system is established in ADAMS, and the accuracy of the model is verified by comparing the natural frequency obtained by simulation, experiment and MATLAB calculation. Through the simulation analysis of idle condition, the vertical response force of the suspension is reduced after optimization, which shows that the optimized scheme is effective. 6. According to the optimization scheme, the test car was reformed to measure the noise level of the test car in idle speed, uniform speed and acceleration condition before and after the revamping. According to the experimental results, the noise peak at the second order and the fourth order frequency of the vehicle is obviously decreased after the vehicle is reformed, which shows that the decoupling theory and the optimization scheme proposed in this paper are effective.
【學(xué)位授予單位】:吉林大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:U464.13
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