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为了建立一种估算发动机表面响应的方法,对一台4缸(缸径86mm,冲程84mm)、直列、水冷、高速柴油机进行了一系列试验。这里总结了静态试验取得的结果及背景。发动机结构中的激振力的传递特性、振动传递途径的振动特性及传递函数是在静态下考察的。对发动机中阻尼的分布、冷却水、润滑油、油压及曲柄位置对传递函数的影响也作了考察。在这些试验之后,发现(a)、不同的激振力由于其传递途径和传递特性不同,对发动机表面诱发不同的响应;(b)、作用于缸盖的力可以经过缸盖螺栓传递,发动机结构由此力激发的振动和同样的力作用于活塞顶部引起的振动可能同样强烈;(c)、发动机结构中的阻尼大部份是由活塞、连杆、曲轴等主要运动件周围的油膜引起的。
In order to establish a method of estimating engine surface response, a series of tests were conducted on a 4-cylinder (86mm bore, 84mm stroke), inline, water cooled, high speed diesel engine. Here is a summary of the results of the static test and background. The transmission characteristics of the excitation force in the engine structure, the vibration characteristics of the vibration transmission path and the transfer function are investigated under static conditions. The influence of damping distribution, cooling water, lubricating oil, hydraulic pressure and crank position on the transfer function in the engine was also investigated. After these tests, it was found that (a) different excitation forces induce different responses to the engine surface due to their different transmission and transfer characteristics; (b) the forces acting on the cylinder head can be transmitted through the cylinder head bolts and the engine (C) The damping in the engine structure is mostly caused by the oil film around the main moving parts such as pistons, connecting rods, crankshafts and the like of.