Abstract:
To measure the resistance torque exerted by the extravehicular low-frequency lashing cables on the joint movement of the Chang’e-7 leaper in the extreme lunar environment, an in-situ method for measuring rotational resistance torque within a temperature range of -195 ℃ to 120 ℃ was proposed. A test device, equipped with a drive system and a temperature control system, was designed. Rotational resistance torque measurements, with and without lashing cables, were conducted at eight different temperature settings. The test results show that due to the complexity of the multi-point lashing process between the rotating mating surface and the cable, the effect of temperature on the resistance torque is non-linear, requiring tests across the entire temperature range of interest. Additionally, at temperatures below -150 ℃, the torque generated by cable torsion increases rapidly, necessitating careful attention. This research method holds practical implications for selecting cables suitable for aerospace applications and for understanding the effects of temperature on the resistance torque during joint rotation.