基于Mindlin模型的悬臂梁传感器接触滞后误差分析

基于摩擦学方法对悬臂梁安装结构建立物理模型,采用有限元方法计算接触面的应力状态进行求解,然后根据接触力学中的Mindlin方法得出接触面耗散的能量,从而得出接触面产生的滞后误差。通过试验对计算结果进行验证,结果表明悬臂梁的滞后误差与加载额度和最大载荷有关。但最大载荷一定时,相对滞后误差趋近于常数。设计应用悬臂梁式传感器时,要根据载荷确定安装面的结构能够在一定范围内提高悬臂梁传感器的精度。     

A Damping Characteristics Calculation Method of Metal Dry Friction Isolators

The dry friction ring-type vibration isolator is considered as an isotropic continuous medium.A method of dry friction hysteresis loop calculation is proposed based on friction force analysis of contact beam.The friction force is modeled as an equivalent distributed moment to use the finite element method(FEM)to calculate the dry friction vibration isolator hysteresis loop,so the damping characteristics can be obtained.A comparison of the hysteresis loop calculation results and the experimental results shows the average relative error is 2.7%,it proves the calculation method is feasible.     

预变形对多层钢板支撑转子运动稳定性的影响

多层波纹钢板阻尼器支撑转子系统是利用干摩擦作用实现阻尼减振.阻尼器装配时的预压缩变形影响转子的运动稳定性.文中基于李雅普诺夫线性化理论对转子系统的运动稳定性进行研究,得出系统平凡解的稳定条件,并给出应用实例.结果表明,根据预变形处的迟滞回线计算能判断转子系统的运动稳定性.     

一种调整悬臂剪切梁传感器误差的方法

本文从电阻应变式悬臂剪切梁传感器结构对非线性误差进行分析,采用有限元方法计算贴片孔位置对传感器的非线性误差影响,再通过试验对计算结果进行验证。结果表明悬臂剪切梁的承载孔位置对传感器的非线性误差影响可通过有限元方法定量计算。设计应用悬臂剪切梁式传感器时,对非线性误差应与传感器的其他误差综合考虑能有效提高传感器的精度。     

Local linearization modeling method of a multilayer wave-shaped steel-belt damper （MWSD）

To analyze the modeling methods of the dry friction rotor system, a local linearization model of the dry friction damping rotor system was built based on the simplified model of the wave-shaped steel-belt supporting rotor system. In this model, the linear stiffness of damper closed to pre-deformation was defined as the stiffness of damper, the maximum amplitude of the rotor was calculated according to the load and linear rotor, and the damper＇s parameters were defined on the basis of the energy dissipation parameters. The presented method can reflect the hysteresis characteristics and is easy to calculate. Experimental results demonstrate the accuracy and feasibility of this method.     

多层波纹钢板转子阻尼器能量耗散系数计算方法

多层波纹钢板转子阻尼器是利用干摩擦原理实现转子阻尼减振的支撑零件。这种阻尼器能在高低温等恶劣环境下工作,同时阻尼特性受转子偏心影响小,可以通过改变阻尼器钢板的厚度提高阻尼器的能量耗散性能。在有限元法和摩擦学原理的基础上进行理论分析,根据多层波纹钢板转子阻尼器的能量耗散分布,提出多层钢板阻尼器的能量耗散系数的计算方法。该方法首先通过有限元分析获得接触应力,然后采用Mindlin接触模型推导出两层干摩擦接触表面摩擦耗能的计算公式,最后得出转子阻尼器整体的能量耗散系数。试验证明了该计算方法是正确可行的,具有较高计算精度。     

多层环形钢板阻尼器隔振系统建模与仿真研究

为了满足航空航天等特殊工况下阻尼减振的需要,研制了多层环形钢板阻尼器,该阻尼器借助于载荷作用下多层金属环之间的摩擦力实现阻尼隔振,并进行了多层环形钢板阻尼器的结构设计;根据动力学原理,建立了阻尼器的振动系统模型及系统方程;利用相轨迹方法获得了自由振动相图;以实验研究为基础进行了动态仿真,并对仿真结果加以分析,获得了多层环形钢板阻尼振动系统的动态特性。