We discuss analogies between the chargeand spin response functions of itinerant magnets. We show that the spin-analog of the charge stiffness is not given by the usual spin stiffness ρs, but by the dynamic spin stiffness Ds, which is obtained from the dynamic spin conductance Gs(ω) in the limit of vanishing frequency ω. The low-frequency behavior of Gs(ω) is used to define ideal spin conductors...

The torsional stiffness of the reducer is commonly assumed to be static and tested using hysteresis curve method. However, practical engineering experience shows that dynamic rather than static, method cannot accurately represent reducer’s during actual operation. To address these issues, this study conducts theoretical research on characteristics stiffness, introduces a new concept called prov...

The vibration of robot joint reducer is the main factor that causes vibration or motion error of robot system. To improve the dynamic precision of robot system, the cycloid ball transmission used in robot joint is selected as study object in this paper. An efficient dynamic modelling method is presented-lumped stiffness method. Based on lumped stiffness method, a translational-torsional couplin...