METHOD FOR RECOGNIZING SPATIAL DISTRIBUTION AND STATISTICAL FEATURE OF RANDOM DYNAMIC LOAD

摘要

A method for recognizing the spatial distribution and statistical features of a random dynamic load. The method comprises the steps of: S1. carrying out a modal experiment so as to acquire mode parameters of a structure, the parameters comprising an inherent frequency and a mode shape; S2. expanding a random vibration response of the structure by using the mode shape so as to acquire a dynamic response, in a mode space, of the structure; S3. by means of mode shape expansion, projecting random dynamic loads, distributed with the space, onto the mode space; S4. in the mode space, inverting random dynamic load samples according to random dynamic response samples; and S5. calculating the spatial distribution and statistical features of a random dynamic load on the structure according to the random dynamic load samples in the mode space and mode shape functions. The method can solve the problem of recognizing, in a time domain, the statistical properties and distribution features of random dynamic loads on a structure by means of actually measured dynamic response samples of the structure, and provide accurate and reliable dynamic load information for the design and safety assessment of an engineering structure serving in a distributed random dynamic load environment.