Research on the Design Method of Smart Spring Support for Vibration Damping of the Multi-Span Shaft System

When the helicopter tail transmission shafting is over-critical, the shafting vibration intensifies, which restricts the overall performance of the helicopter. The smart spring support is an active damping device, which can effectively suppress the vibration of multi-span shafting. In this paper, the configuration and structural design of the smart spring support for multi-span shafting are studied, and its vibration damping performance is verified by experiments. Firstly, based on the vibration reduction principle of the smart spring support, the vibration characteristics of the smart spring are analyzed. The motion equation of the smart spring support was established, the influence of the configuration parameters on its vibration characteristics was analyzed, and the configuration parameters of the smart spring support were determined. On this basis, the configuration schemes of the smart spring support are proposed, the structural design of the smart spring support is carried out, and the structural parameters are determined. The shafting vibration reduction test system with the smart spring support was built, and the smart spring vibration damping tests were conducted under different control voltages. The results show that the smart spring support has a good suppression effect on the accelerated over-critical vibration response of the shaft system.