汽车挡风玻璃洗涤液喷水壶动态特性分析
Analysis of Dynamic Characteristics for Windshield Washer Reservoir of Vehicles

为了验证某车用喷水壶产品的动态特性是否满足工程设计要求，基于Ansys有限元仿真软件对该产品进行约束模态分析，得出产品的固有频率及对应的各阶振型，并对其模态特性进行分析；基于模态分析结果对该产品进行谐响应分析，考察其在模拟工况下共振位置的应力情况，从而找出箱体结构的薄弱部位。分析表明：喷水壶产品的前六阶固有频率不会与发动机激励频率(怠速和通常工作转速的情况下)、路面激励频率发生共振；当加入外部激励，喷水壶振动频率与模态固有频率接近时，其支架A与箱体衔接部位最先容易产生疲劳破坏。经过对薄弱部位进行结构改进，改进后该部位的频响应力降低了45.11%，增强了喷水壶的整体强度。
In order to verify whether the dynamic characteristics of a car washer reservoir product meet the requirements of engineering design, the constrained modal analysis of the product is carried out based on Ansys finite element simulation software, and the natural frequency and corresponding vibration modes of the product are obtained, and the modal characteristics are analyzed. Based on the results of modal analysis, the harmonic response of the product is analyzed, and the stress of the resonant position under simulated working conditions is investigated, so as to find out the weak part of the box structure. The analysis shows that the first six natural frequencies of the washer reservoir product will not resonate with the engine excitation frequency (idle speed and normal working speed) and the road excitation frequency. When the external excitation is added, the vibration frequency of the washer reservoir is close to the natural frequency of the mode, and the joint part of the support A and the box is the first easy to produce fatigue damage. After improving the structure of the weak part, the frequency response force of the improved part is reduced by 45.11%, and the overall strength of the washer reservoir is enhanced.