Backhoe Loader Cab Internal Acoustic Simulation and Structure Improvement

随着经济建设的发展与人们环保意识的提高，工程机械噪声、振动与舒适性已经是除了动力性、经济性和排放之外衡量其品质的重要指标。目前国内对运用有限元等现代设计分析方法对工程车辆驾驶室噪声进行分析、预测与控制还不成熟，相比国外企业和研究机构起步较晚，尤其是驾驶室内20~200Hz范围内的低频噪声。本文针对某型号挖掘装载机驾驶室的低频噪声问题，利用有限元法对驾驶室结构性能、驾驶室内噪声特性进行相关研究。 首先，对某型号挖掘装载机进行整机和零部件的振动噪声信号采集，并对相应的测试数据进行频谱和数值分析，了解该挖掘装载机驾驶室的振动噪声水平，利用获得的初步结论为后续的有限元分析提供有效实验依据。 其次，...With the development of economic construction and the improvement of people’s consciousness about the environmental protection, in addition to dynamic property, economical efficiency and emissions, noise, vibration and harshness have become the important indicators to measure the quality of loaders. Started later than foreign enterprises and research institutions, it is not yet mature currently to...学位：工学硕士院系专业：物理与机电工程学院_机械设计及理论学号：1992011115276

Dynamical model of idler and simulation of wheel's falling-off for triangular tracked

为解决三角履带脱轮问题,将动力学仿真技术应用到设计中。结合诱导轮、张紧装置、支撑轮、驱动轮等部件的结构,分析了其受力情况,并建立了一类诱导轮张紧装置的动力学模型;同时利用多体动力学软件rECurdyn建立了三角履带车辆的模型,研究了其诱导轮张紧装置的预紧力参数变化对履带张紧力和前端支撑轮垂向位移的影响规律。研究结果表明:适当地增加车辆三角履带张紧装置的压力能够有效地减少支撑轮的垂向位移;计算结果与仿真值的比较结果显示两者基本吻合,说明了该仿真模型的合理性,这为三角履带详细设计阶段各参数的获取提供了参考。Aiming at the problem of wheel's falling-off for triangular tracked,dynamics simulation technology was investigated.After the analysis of the stress based on the structure of idler,tension device,supporting the wheel and so on,the tension device's dynamic model of idler was established.By using mutibody dynamic software-RecurDyn,the model of triangular track vehicle was developed.Dynamics simulation was established,the influence to tension of the track and the vertical deviation of the anterior supporting wheel through changing the preload parameter of the idler's tension device was analyzed.The results show that the vertical deviation of supporting wheel is reduced effectively by increasing prestressing force suitably.The calculated results are compared with the simulation value,which shows they are reasonable.The results can be used as a reference for optimum of the design phase.国家科技部创新方法工作专项资助项目(2011IM020400); 福建省高校产学合作科技重大资助项目(2011H6024