轮刷式小行星采样器采样过程仿真与试验研究

Simulation and Experimental Research on the Sampling Process of the Wheel Brush Asteroid Sampler

基于回转轮刷的刷扫采样是面向小行星表面风化层颗粒的一种新型采样方式,为研究轮刷式小行星采样器的轮刷转速对采样效果的影响,以及采样轮刷所需的驱动扭矩,开展采样器刷扫采样过程的仿真和试验研究尤为必要。研究选取粒径均等的玻璃球颗粒作为采样颗粒,对其进行参数标定,并将标定后的颗粒参数用于数值模拟中,获得采样器在不同转速工况下的采样结果和颗粒流动曲线。同时,搭建一套回转式对称采样轮刷装置进行地面试验,并测试采样过程中轮刷的扭矩变化,对比仿真与试验结果,验证仿真分析的准确性。结果表明,采样轮刷转速越快,采样颗粒质量越多,同时采样轮刷所需的驱动扭矩也越大,其扭矩的波动性也越明显。该研究为轮刷式小行星采样器的结构优化设计与电机选型提供研究思路。

The brush sampling method based on rotary brush is a new sampling method for asteroid surface regolith particles collection.In order to study the influence of wheel brush speed on sampling effect of wheel brush asteroid sampler and the driving torque required by wheel brush sampling,it is necessary to carry out the simulation and experimental study on the brush sampling process of the wheel brush asteroid sampler.In the study,the glass beads with equal size are selected as the sampling particles to calibrate the parameters of the sampling particles,and the calibrated particles parameters are used in the numerical simulation,and the sampling results and particle flow curves under different speeds are obtained.At the same time,a rotary symmetrical sampling wheel brush device is built for ground test,and the torque change of the wheel brush during the sampling process is tested.The simulation and test results are compared to verify the accuracy of the simulation analysis.The results show that the faster the rotation speed of the sampling wheel brush is,the more particles are sampled,and the greater the driving torque required by the sampling wheel brush is,and the more obvious the torque fluctuation is.This research provides a research idea for the structure optimization design and motor selection of the wheel brush asteroid sampler.