Impactor's inverse design and parametric optimization of an impact machinery based on optimal stress waveform

The energy supply to a moon soil sampling machinery is limited under space environment. Here, energy transfer efficiencies were analyzed and compared under different stress waveforms and a constant rock-soil's dynamic stiffness based on a general impact machinery model. The impactor's wave impedance was designed inversely based on one-dimensional wave mechanics and Dirac delta function δ(t) in order to achieve the optimal waveform. The correctness of the impactor's inverse design was verified with the forward solution and FEM. The motion state and stress between the impactor and rod were analyzed with the assuming separation method. The energy transfer efficiency and impactor's impaction efficiency influenced by impactor's geometry dimensionless parameters were analyzed and the optimal parameters were also calculated.