内燃动力总成双层隔振系统瞬态计算方法研究

内燃机被广泛应用于生活生产各个方面,但其工作过程中产生的振动与噪声一直困扰着人们。为了减少内燃动力机组整机振动对周围环境产生的不利影响,可将机组通过单层或双层隔振系统安装在基础上。结合相关研究可知,进行内燃动力机组整机振动分析时,除了要计算机组工作转速范围内的整机振动外,掌握机组启停过程的共振响应情况也是必要的。本文以隔振系统中较为复杂的内燃动力总成双层隔振系统为研究对象,首先通过试验掌握了采用双层隔振系统的内燃动力机组启停过程典型共振响应特性,同时试验结果也为验证计算方法正确性的提供了依据。然后,建立了双层隔振系统动力学模型,采用中心差分法为数值计算方法,结合内燃动力总成特点对机组启停过程加载了激振力,仿真计算所得结果与实测结果的共振响应频率基本一致,最大幅值接近。本文提出的隔振系统瞬态计算方法,能够对机组启停过程的共振响应进行准确计算,为在设计阶段掌握内燃动力机组启停过程的共振响应特性提供了可能。该方法虽然是以内燃动力总成双层隔振系统为对象进行研究,对于采用单层隔振系统的内燃动力机组也可适用。

Research on Transient Calculation Method of Internal Combustion Powertrain Double-layer Vibration Isolation System

The internal combustion engine is widely used in all aspects of life and enterprise manufacturing,but the vibration and noise generated from its work have always troubled people.In order to reduce the adverse impact of the vibration of the internal combustion Machine's vibration on the surrounding environment,the unit can be installed on the foundation through a single-layer or double-layer vibration isolation system.Combining with related research,we can know that when analyzing the vibration of the internal combustion Machine's vibration,in addition to calculating the vibration of the whole unit within the operating rotating speed range,it is necessary to grasp the resonance response of the unit during the start and stop process.In this paper,the more complex internal combustion powertrain double-layer vibration isolation system in the vibration isolation system is taken as the research object.First,we grasped the typical resonance response characteristics of the internal combustion power unit using the double-layer vibration isolation system during the start-stop process through experiments.The test results also provide a basis for verifying the correctness of the calculation method.Then,we established a dynamic model of the double-layer vibration isolation system,using the central difference method as the numerical calculation method to load the exciting force during the start-stop process combined with the characteristics of the internal combustion powertrain.The results of the simulation calculation are basically consistent with the measured resonance frequency and the maximum amplitude is also close to it.The transient calculation method of the vibration isolation system proposed in this paper can accurately calculate the resonance response of the unit during the start and stop process,and provides a possibility for grasping the resonance response characteristics of the internal combustion power unit during the design phase.Although this method is researched on the double-layer vibration isolation system of an internal combustion powertrain,it is also applicable to internal combustion power units using a single-layer vibration isolation system.