Abstract: Based on the closedloop coupling model for brake squeal analysis and by applying the theories of vibration and modal analysis, the vibration energy of brake disc itself in both static and dynamic closedloop coupling models are calculated respectively at a modal frequency of 13kHz. Then the vibration energy flow and the vibration transmitting path in friction coupling interface are analyzed with a result showing that the dominant transmission path of vibration in coupling interface is from brake disc to brake pads. Finally, the vibration energy equilibrium analysis of brake disk verifies the reliability and correctness of related vibration energy calculation. The analyses in this paper provide a theoretical basis for the further investigation into the forming mechanism of highfrequency brake squeal.

Key words: close-loop coupling disc brake squeal model, brake disc itself vibration energy, energy flow, energy equilibrium, high frequency brake squeal, high frequency brake squeal, closed loop coupling model, vibration energy, energy flow, energy equilibrium