摘要
地面振动试验能够应用于结构的振动环境适应能力研究,是因为当结构满足一定的动力学特性要求时,试验室振动载荷可以等效模拟实际振动环境载荷的动力学效应。给出了随机振动载荷等效设计的一种工程方法,它基于结构随机振动响应近似分析原理,以结构位移响应和/或应力响应等价为目标,实现了利用单一随机载荷模拟多点不相关随机振动载荷的等效;为了进一步评价等效载荷的有效性,应用累积损伤线性模型分析结构振动疲劳损伤及其等效过程中的变化。简支梁数值模拟结果表明,利用这种方法设计的等效载荷,可以等效模拟多点不相关随机振动载荷,简支梁的响应与疲劳损伤相差不大。
Ground vibration test （GVT） can be used to verify the adaptability of structure to actual environment vibration based on the fact that the excitation in GVT can simulate the real environment vibration loadings equivalently for the structure with certain dynamic characteristics.A dynamic equivalent method is presented for random vibration excitations and a process is investigated for simulating multi-point uncorrelated random vibration excitations using a single loading according to the approximate analysis method of vibration response of structure. The equivalent excitation is designed to produce quivalent responses （displacement and stress） and a fatigue damage analysis method is provided in order to compare the effect between initial excitation and equivalent one using Miner＇s linear rule. A numerical example for simply supported beam is supplied to verify rationality of the proposed method for designing the equivalent vibration excitation.
出处
《电子产品可靠性与环境试验》
2007年第4期1-5,共5页
Electronic Product Reliability and Environmental Testing
关键词
随机振动载荷
动力学等效
不相关激励
多输入系统
random excitation
vibration equivalence
uncorrected random vibration excitations
multi-input system sparse modal and lightly damping structure
