School of Mechanical Engineering Beijing Institute of Technology Beijing 100081 ChinaNational Key Laboratory of Vehicular Transmission Beijing Institute of Technology Beijing 100081 China;
School of Mechanical Engineering Beijing Institute of Technology Beijing 100081 China;
School of Mechanical Engineering Taiyuan University of Technology Taiyuan 030024 China;
School of Mechanical Engineering Beijing Institute of Technology Beijing 100081 China;
Hydro-viscous clutch; mixed lubrication; speed stability; negative gradient of friction coefficient-slipping speed; torsional vibration model; critical negative gradient;