摘要
Based on the advantages of hydraulic and pneumatic mounts,a new hydro-pneumatic mount(HPM)is proposed to improve the low-frequency ride comfort of vibration rollers.Through the experiment of the vibratory roller,a nonlinear vehicle dynamic model working on off-road soil grounds is then established to assess the HPM's ride comfort in the low-frequency region.Two indices,the power spectral density(PSD)acceleration and root mean square(RMS)acceleration of the operator vibration and cab shaking,are chosen as objective functions in both the frequency and time regions.The research results show that when the cab isolations are equipped with the HPM,the RMS values of the operator's seat,cab's pitch and roll angles are reduced by 35%,42%and 53%;and the maximum PSD of the operator's seat,cab's pitch and roll angles are decreased by 39%,59%and 65%,respectively.Consequently,the characteristics of the nonlinear damper and high-static stiffness of HPM can greatly reduce the operator vibration and cab shaking in the low-frequency region when compared to the vibratory roller's cab using the rubber mounts.
基于液压和气动隔振的优势,提出了一种新型的液压气隔振(HPM),以提高振动压路机的低频率平顺性.通过振动压路机的实验,建立了在地面变形上相互作用的非线性整车动力学模型,以分析HPM在低频率范围的平顺性.在低频率和时间范围中,以驾驶员振动和驾驶室晃动的功率谱密度加速度(PSD)与加权加速度均方根值(RMS)2个指标为目标函数.研究结果表明:驾驶室隔振配备了HPM,驾驶室座椅垂向振动,驾驶室的俯仰和倾斜晃动的RMS值分别降低了35%、42%和53%;驾驶室座椅垂向振动,驾驶室的俯仰和倾斜晃动的最大PSD值分别降低了39%、59%和65%.因此,在低频率范围中,与使用橡胶隔振的振动压路机驾驶室相比,HPM的非线性阻尼与高静态刚度的特性对减少驾驶员振动和控制驾驶室晃动有明显的影响.
基金
The National Key Research and Development Plan(No.2019YFB2006402)
Talent Introduction Fund Project of Hubei Polytechnic University(No.19XJK17R)
the Joint Key Project Founded by Southeast University and Nanjing Medical University(No.2019DN0011)。
