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| Modal Test Technology of a Certain Launch Vehicle at the Firing Range |
| Received:March 22, 2024 Revised:May 31, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2024.10.010 |
| KeyWord:launchvehicle firing range simulation calculation modal test multi-point fully coherent excitation mode slope |
| Author | Institution |
| YIN Chunlei |
Beijing Institute of Structure and Environment Engineering, Beijing , China |
| LI Shuang |
Beijing Institute of Structure and Environment Engineering, Beijing , China |
| YANG Xueyin |
Beijing Institute of Structure and Environment Engineering, Beijing , China |
| HUO Yi |
Beijing Institute of Structure and Environment Engineering, Beijing , China |
| ZHU Minghao |
Beijing Institute of Structure and Environment Engineering, Beijing , China |
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| Abstract: |
| On the premise of canceling the traditional free-free whole launch vehicle modal test, the work aims to obtain the modal parameters of a certain launch vehicle through the free-clamped modal test at the firing range to provide evidence for the overall design of the launch vehicle. Based on the simulation model and modal test data of the same sections of mature models, a high-precision three-dimensional dynamic model of the whole launch vehicle was established to predict structural modal parameters, providing guidance for the excitation scheme and measurement scheme of the modal test at the firing range. Through the multi-point fully coherent step-by-step sinusoidal excitation modal test, the "pseudo-frequency response function" obtained from the test was used for parameter identification to obtain the modal parameters of the structure. The first four bending modes and the first torsional mode of the whole launch vehicleerected at the firing range were obtained. The maximum deviation of frequency between the identification results based on the "pseudo-frequency response function" and the real frequency response function was 0.82%, and the maximum deviation of damping ratio was 1.89%. The modal test at the firing range of a certain launch vehicle provides key parameters for the overall design of the launch vehicle. The successful maiden flight of the launch vehicle verifies the reliability of the technology and also opens a new path for obtaining the modal parameters of the launch vehicle. |
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