A dynamic calibration method for a dynamometric system in impulse combustion facilities

A new dynamic calibration method for a dynamometric system in impulse combustion facilities is proposed. The calibration involved uses an instrumented impact hammer to apply individual calibration forces in different directions at different positions on a face of the model and calculates the unit impulse response function (UIRF) of the face from input loads and output strains. UIRFs of different faces are weighted to obtain the UIRF of the dynamometric system and the weighting coefficients are determined by the pressure on each face under the experimental condition. By parameterization, the problem is converted into a parameter optimization problem to solve the UIRF. Using a genetic algorithm to obtain the approximation of the global optimal solution of the parameters and setting it as the initial value of a simplex algorithm, the exact solution is obtained by the simplex algorithm then. ANSYS simulation of the dynamic calibration is presented. Input loads and output strains are recorded and noises are added to the output strains to simulate the actual experimental situation. The simulation validates the accuracy and feasibility of the dynamic calibration method.