金属丝网减振器静动态特性试验及理论研究

发布时间：2018-06-30 20:53

本文选题：金属丝网减振器 + 静动态试验　；参考：《中北大学》2017年硕士论文

【摘要】：对于大功率柴油机,研究与设计出一个减振性能良好的柴油机减振系统,可以有效的降低和改善柴油机的振动向支撑基础的传递。本文针对某型号军用装甲车辆大功率柴油机重量大、工作环境恶劣、设计空间小等因素,开发研制出金属丝网减振器进行减振和支撑,由于其具有承载能力强、阻尼系数大、耐高温、抗腐蚀、防辐射、以及寿命长等优点,极大的提高了减振系统的减振能力。本文通过采用奥氏体不锈钢丝作为金属丝网减振器的减振材料,对其进行加工编织,通过螺旋、网络铺设、勾连、冲压成型,最后形成所需要的减振元件——网块,分别对金属丝网减振器静动态试验分析,得到:金属丝网减振器的刚度特性,即载荷—位移曲线,呈现先软后硬的变化趋势,而频响曲线会发生跳跃和谐振峰漂移的现象。并将相对密度、丝径、预变形等结构参数考虑其中,分析它们对刚度、阻尼特性以及传递率的影响,从中选取合适的针对不同型号和工况下的结构参数。基于金属丝网减振器的非线性硬特性以及迟滞现象,对其进行理论分析与研究,将变刚度和变阻尼进行线性等效,解释了频响曲线发生跳跃和谐振峰漂移的现象,并根据非线性本构关系,建立金属丝网减振器的数学模型,进行参数辨识和计算,最后通过响应特性的有效验证,得出其模型能够很好的反应实际工况和工程应用要求。
[Abstract]:For high power diesel engine, a good damping system for diesel engine is studied and designed, which can effectively reduce and improve the transmission of diesel engine vibration to the supporting foundation. Aiming at the factors of large weight, bad working environment and small design space of a certain type of military armored vehicle high power diesel engine, this paper develops a wire mesh damper for vibration absorption and support, because of its strong bearing capacity and large damping coefficient. High temperature resistance, corrosion resistance, radiation resistance, and long life, greatly improve the vibration absorption system. In this paper, the austenitic stainless steel wire is used as the vibration absorber material of the wire mesh absorber, which is machined and braided. Finally, the necessary damping element, the mesh block, is formed by spiral, network laying, cogging, stamping forming. The static and dynamic experiments of wire mesh absorber show that the stiffness characteristics of wire mesh absorber, i.e. load-displacement curve, show the change trend of first soft and then hard, and the frequency response curve will jump and resonance peak drift. The relative density, wire diameter, pre-deformation and other structural parameters are taken into account, and their effects on stiffness, damping characteristics and transfer rate are analyzed, and the appropriate structural parameters are selected for different types and working conditions. Based on the nonlinear hard characteristics and hysteresis of wire mesh absorber, the linear equivalent of variable stiffness and variable damping is analyzed and studied theoretically, which explains the phenomenon of frequency response curve jumping and resonant peak drift. According to the nonlinear constitutive relation, the mathematical model of the wire mesh damper is established, and the parameter identification and calculation are carried out. Finally, through the effective verification of the response characteristics, it is concluded that the model can well respond to the actual working conditions and engineering application requirements.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TK423;TB535

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