Mechanical properties research of the cassette balance for impulse wind tunnel based on inertia compensation

2017 2nd International Seminar on Advances in Materials Science and Engineering

Zhang, X.Q.^1 ; Lv, J.Z.^1,2 ; Wu, Y.C.^1

Science and Technology on Scramjet Laboratory, Hypervelocity Aerodynamics Institute CARDC, Mianyang, 621000, China^1

Tribology Research Institute, Mechanical Engineering School, Southwest Jiaotong University, Chengdu

610031, China^2

关键词: Beam system;    Dynamic equations;    Dynamic property;    Force balances;    Impulse wind tunnel;    Inertia compensations;    Output and inputs;    Transient errors;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/231/1/012155/pdf
DOI  :  10.1088/1757-899X/231/1/012155

来源: IOP

【 摘 要 】

The aerodynamic load signals acquired though the cassette force balance is transient while the model was tested in an impulse combustion wind tunnel. Therefore, it is necessary to explore the dynamic properties of the force balance. Firstly, it is simplified as a springs-damping-beam system, and then, the dynamic equation is deduced. Secondly, the mechanical properties of the force balance are researched through the finite element method. The output histories of the balance under step and sine loading are acquired. Results show that the mean elastic output of the balance approximates to the load exerting on it. Furthermore, the inertia compensation could not only improve the accuracy of mean output significantly, but also could reduce the transient error between output and input sharply.