METHOD FOR INDIRECTLY ACQUIRING CONTINUOUS DISTRIBUTION MECHANICAL PARAMETER FIELD OF NON-HOMOGENEOUS MATERIALS

摘要

A method for indirectly acquiring a continuous distribution mechanical parameter field of non-homogeneous materials, comprising the following steps: S1, carrying out a non-homogeneous material beam modal test and acquiring a test frequency response function; S2, simulating a continuous distribution mechanical parameter field of materials and establishing a structural dynamics model based on orthogonal polynomial expansion; S3, solving a sensitivity matrix of an acceleration frequency response function relative to an orthogonal polynomial coefficient; S4, identifying an orthogonal polynomial coefficient in a material parameter model based on an optimization algorithm; and S5, reconstructing a mechanical parameter distribution field of the non-homogeneous materials. The method can solve the problem of acquiring mechanical parameters of non-homogeneous materials, and provide accurate parameters for structural mechanics modeling and analysis using the non-homogeneous materials.