The stability analysis of 3-RPR wind tunnel test bed based on workbench

Abstract

This paper introduces a kind of wind tunnel test bed with a 3-RPR structure. Ansys workbench is chosen to be the main tool here to measure the structure's stability. Linear static structure analysis, modal analysis and harmonic response analysis are carried out to detect the force, the frequency and the mode of the structure. And this work would build a basis for later work on the wind tunnel test bed. 1. Introduction Wind tunnel experiment is an essential stage of air vehicle development. Plenty of flow tests need to be carried out during the process of the development of each kind of the air vehicle. So the stability of the support structure has a crucial effect on the accuracy of the experiment results(1). This paper introduces a kind of wind tunnel test bed based on 3-RPR structure with six degrees of freedom. It consists of a guide rail, 3-RPR planar parallel mechanisms, a bent-structure part, a test model and so on(1). The organization of the structure is shown in figure1. The system can be a hard support in the experiment, realizing the motion of yawing, pitching and rolling of the model. As a kind of engineering simulation technology platform, Ansys Workbench can provide a new project view function, combining the whole simulation process together, and completing the complex analysis by simple towing operation. This paper would conduct the stability analysis of the wind tunnel test bed(2) from three aspects: linear static structure analysis, modal analysis and harmonious response analysis. After removing unnecessary part of the system, the finial structure measured is shown in figure2