Thermal Instability Modeling Research on Hot Spots of Sealing Ring in Transmission of Vehicle

doi:10.3901/JME.2020.09.154

Abstract

Abstract: According to the characteristics of the sealing rings in the transmission of a vehicle, a finite element method of thermal instability is presented for determining the critical speeds of local hot spots on the sealing rings. The temperature perturbation of the sealing ring is expressed. The finite element model of the thermal instability for hot spots is constructed based on the Galerkin finite element algorithm. The solution of thermal structure coupled problem is completed, and an algorithm for calculating the critical speeds of hot spots on the sealing ring is developed. Taking copper-based powder metallurgy and gray cast iron sealing materials as examples, the critical speeds of local hot spots are calculated at the different frictional coefficients. The effects of sealing material properties on the critical speed, such as elastic modulus, thermal conductivity, specific heat capacity, and thermal expansion coefficient, are determined. Experimental investigations are performed using a seal test rig. A test method of the thermal instability is proposed, which is applied to observe the perturbation and migration of the sealing ring temperature for two sealing materials, allowing for a comparison of the calculated and experimental critical speed results to enable an assessment of the accuracy level. The numerical and experimental results indicated the effectiveness of the finite element model in simulating hot spots of the sealing rings.

Key words: sealing ring, hot spot, finite element method, critical speed

CLC Number:

TH117

GONG Ran, ZHAN Chao, XU Yi, ZHANG He. Thermal Instability Modeling Research on Hot Spots of Sealing Ring in Transmission of Vehicle[J]. Journal of Mechanical Engineering, 2020, 56(9): 154-161.

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