星壤力学感知模组的动态特性补偿技术

During the star-soil penetrative exploration process, the detector operates under high-overload conditions. The mechanical sensing module, typically located at the foremost part of the detector, experiences the most severe stress environment. To prevent damage from high overloads, the module requires potting. However, while potting materials enhance the module’ s impact resistance, they introduce nonlinearities in the amplitude-frequency response. This paper addresses this issue by proposing the ‘co-planar excitation’ impact calibration method and the data processing method of ‘order-adaptive identification NLS-Wolfe line search’. First, leveraging the principle of symmetry, the reference sensor and the module under calibration are mounted symmetrically on the movable table of a shock amplifier. Dynamic calibration of the mechanical sensing module is achieved under co-planar excitation pulses. During the calibration data processing, the order of the transfer function is determined through order-adaptive identification, and the transfer function parameters are identified using the NLS-Wolfe line search identification module. Results show that after compensation, the operating frequency bandwidth with amplitude error within ±5% is effectively extended to 12. 356 kHz, and the correlation of the main pulse reaches 97. 69%.