基于发动机悬置优化的青贮玉米收割机减振技术研究

Vibration reduction technology analysis on silage corn harvester based on engine suspension optimization

针对青贮玉米收割机的振动问题,以发动机悬置为研究对象,采用理论推导、仿真分析和试验验证相结合的方法,根据故障样机道路试验的结果,研究发动机工作过程中产生的动态激励,构建包括发动机悬置参数在内的整机模型,分析发动机悬置的隔振性能,完成发动机悬置的优化设计,进行青贮玉米收割机的整车道路试验,验证发动机悬置优化后整机的减振效果。试验结果表明:采用发动机悬置优化方案后,驾驶室的振动情况得到明显改善,驾驶室座椅处的自功率谱峰值由原来的0.69 m/s^2下降到0.28 m/s^2,比优化前降低59.4%,有效地改善青贮玉米收割机的低频振动现象。论文的研究成果具有较强的工程应用前景,可为青贮玉米收割机的研发和优化升级提供理论指导和技术支撑。

According to the vibration problem of silage corn harvester, taking engine suspension as research object, this paper adopt the combining methods of theoretical derivation, simulation analysis and experimental verification, on the basis of fault prototype road vibration test results, studied the dynamic excitation generated in the engine working process, constructed the whole machine model including engine suspension parameters, analyzed the vibration isolation performance of engine suspension, completed the optimization design of it,conducted the vehicle road test of silage corn harvester to verify the whole machine vibration damping effect after engine suspension optimization. The experimental results show that the vibration of cab has been significantly improved after using the engine suspension optimization scheme, and the self-power spectrum of cab seat dropped from 0.69 m/s^2 to 0.28 m/s^2, the peak of self-power spectrum is 59.4% lower than before engineer suspension optimization, and the low frequency vibration of silage corn harvester is improved effectively. The research results of this paper have a good engineering application prospect, it can provide theoretical guidance and technical support for silage corn harvester design and optimization.