作　　者： ; ; ; ;

机构地区： 山东大学机械工程学院

出　　处： 《振动与冲击》 2010年第9期97-101,共5页

摘　　要： 针对工程中常见的斜置隔振装置,建立了复杂振源激励、粘弹性斜置支承与基础梁结构三维耦合隔振系统动力学模型。把隔振器模化为Timoshenko梁,给出了梁纵向、弯曲振动导纳。引入粘弹性分数导数模型来描述粘弹性隔振器的动态特性,并考虑隔振支承多维波动效应,推导了耦合系统动态特性传递矩阵及功率流表达式。数值模拟计算表明,粘弹性隔振器是频率相关的;隔振器高频共振形成驻波是输入系统功率下降趋势变缓的主要原因;在中高频域,输人基础的功率随倾斜角增大而降低。 A generalized theoretical model for multiple-degrees-of-freedom vibration analysis of isolation system composed of a vibration source,two inclined viscoelastic isolators and a base was developed.The isolators were modeled as Timoshenko beams and the mobility of the beams on which flexural and longitudinal waves propagate were deduced.Viscoelastic fractional derivative model was adopted to describe the dynamic properties of the viscoelastic isolators.A set of matrix formulas relating the kinematic and dynamic parameters of input and output terminals were derived in consideration of the distributed and flexible nature of the mounts,and the expression of power flow transmission was presented.It is found that the viscoelastic isolators are frequency dependent;the standing waves on the isolators are the main reason of slowing down power flow through the system;in medium-high frequency domain,the power flow through the vibration source and foundation decreases with the increase of inclination of the isolators.

关 键 词： 斜置隔振 梁 粘弹性分数导数模型 驻波 功率流

领　　域： [理学] [理学] [一般工业技术]