The structural dynamic problems of viscoelastic composite pipelines were calculated by means of ANSYS software based on the modal strain energy method, and the APDL code was used for programming. The results were compared with those from the Matlab code. Some results of the effect of different perforating patterns on noise reduction of the pipeline’s damping structure were provided. This work may provide a reference for similar engineering projects.

The basic idea of the synthetic modal test is to divide the whole structure into several substructures. The modal parameters of the substructures are obtained by means of the modal test for the substructures, and then the parameters are synthesized and the whole structure modal parameters are gained. In automobile NVH analysis, the cost and time-consuming of the modal test for whole white body are usually very high. Using the synthetic modal test method, the cost and time-consuming of the modal test can be reduced, and the precision of the test can still satisfy the engineering requirement.

A perforated damping structure is put forward for vibration reduction of pipes of the structure. The vibration performance of this structure is analyzed in use of the modal strain energy method. The approximate dynamics calculation of elastic-viscoelastic composite structure is achieved by using FEM software ANSYS and APDL language programming. This method can be used to design and analyze viscoelastic damping structures in engineering practice simply and feasibly. The perforated damping structure presented in this paper is analyzed by means of this method and some useful conclusions are drawn which can be used as a reference for vibration and noise control of fluid filled pipes.