Development of a miniature dynamic stiffness measurement prototype toward structural health monitoring of space inflatable structures

•Low-frequency dynamic stiffness is proposed as a key health indicator for structural health monitoring of space inflatable structures.•A low power consumption, miniature prototype is developed to in-situ measure dynamic stiffness of inflatable structures.•Two inflatable structures are measured on ground to validate the developed prototype.•The prototype functions well and the outputted results are consistent with that measured by large-bulked commercial ground devices.