本文的主旨在探討一種活塞式液壓引擎避震器的動態特性，此種避震器是由一汽缸、二活塞、一直桿、二液壓室、一圓盤、一阻尼器、二線性彈簧與一橡皮膜(diaphragm)所組成，它與傳統橡膠引擎避震器的最大差別，在於使用金屬做的汽缸來取代橡膠元件，而且整個活塞與直桿的重量以及外施負荷，皆由一阻尼器與二線性彈簧所承擔。與傳統橡膠引擎避震器相比，此種活塞式引擎避震器的優點，在於它有較長的疲勞壽命與較大的載荷能力。本文的研究重點包括，此種活塞式引擎避震器對於來自引擎激振力的減振效應，以及它對來自基座激振位移的傳遞率。本文使用Lagrange方程式來推導整個避震系統的運動方程式，再使用解析法與數值法，來求避震系統的動態反應。有關下列參數對活塞式引擎避震器動態特性的影響，本文亦加以探討：彈簧勁度、阻尼係數、活塞直徑、孔直徑、圓盤厚度及液體黏度等。

　　The objective of this thesis is to study the dynamic analysis of piston- type hydraulic engine mount, this engine mount consists of cylinder, two pistons, bar, two chambers, disk, diaphragm and two springs and damper on the bottom. Compared with traditional rubber engine mount, the advantages of this piston-type engine mount are longer fatigue life and bigger loading bearing. The point of the article including the vibration reduction of engine mount by engine exciting force and the transmissibility by base exciting.In this article, we use Lagrange’s equation to derive the equation of motion, and derive the dynamic responses of the engine mount by exact solution and numerical solution. The influences of dynamic characteristics by some parameters are also studied:spring constant, damping coefficient, piston diameter, orifice diameter, thickness of the disk, kinematic viscosity of the fluid.

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