不同粒径分布模拟月壤承压特性试验研究

月壤的承压特性决定月面巡视探测器的行驶阻力和沉陷,是影响月面可通过性的主要特征之一。为了得出不同粒径分布的模拟月壤在巡视器地面载荷和月面载荷下的承压特性,通过压板试验获取了3种不同粒径分布模拟月壤的承压性能曲线与参数。分析表明:粒径分布对模拟月壤承压性能影响大,粒径粗且分布均匀的JLU-1模拟月壤承压能力最强,其次为JLU-3模拟月壤,而粒径细且分布窄的JLU-2模拟月壤承压能力最弱;3种模拟月壤的变形指数在其他模拟月壤的范围内,松软状态时接近月壤值,在小载荷作用且松软状态时变形指数小于1;3种模拟月壤的内聚模量在其他模拟月壤的范围内,但大于月壤值;松软状态时3种模拟月壤的摩擦模量在其他模拟月壤的范围内,中密和密实状态下均大于月壤值。研究结果对月面探测器行走机构的仿真和路径规划具有参考意义。

Experimental Study on the Pressure-sinkage Characteristic of the Simulant Lunar Regolith with Different Particle Size Distributions

The bearing capacity of lunar regolith determines the rolling resistance of a lunar rover, which is one of the important characteristics for rover trafficability. The pressure-sinkage data of three kinds of simulant lunar regolith samples of JLU-1, JLU-2, and JLU-3 with different particle distributions are obtained by plate tests in different load circumstances. The results show that particle size distribution has great influence on the pressure-sinkage curve. JLU-1 has the strongest bearing capacity due to big particle sizes and uniform distribution. This is followed by JLU-3, and JLU-2 is the weakest due to small particle sizes and narrow distribution. The exponents of deformation of the three kinds of simulant regolith samples are within the range of other simulant lunar regolith, and close to the recommendation of true lunar regolith under soft circumstances. The cohesive modulus of the three kinds of simulant lunar regolith samples are within the range of other simulant lunar regolith too, but greater than the recommended lunar soil in soft circumstances. The frictional moduli of the three kinds of simulant lunar regolith samples are within the range of other simulant lunar regolith in soft circumstances, but greater than the recommended lunar soil in dense and hard circumstances. The results can provide a reference for the evaluation of lunar rover trafficability.