Analysis Of Vibration Damping Effect Of The Composite Structure Of Laying Damping And Stiffened Plate Of High-speed Train Cab

With the increase of high-speed rail’s speed, the vibration noise of the train when running has been put much emphasis these days. And it also affects the rise of train’ speed and the feeling of comfort when you travel by it. Among the components of the vibration noise, the vibration of locomotive cab is the main source. Although many efforts have been taken to the locomotive cab, the requirements still can not be met. The vibration of locomotive cab has great influences on riding personnel and inside precise instruments. Based on CRH6 model, my analysis starting from the head skin structure of the train focus on the scheme of reducing the cab vibration. The research results are compared with the results of the existing structure and damping slurry. They proved my research is superior and feasible.Based on Virtual.Lab, my research reveals the vibration response of the stiffened pattern plate with different size, shape, and arrangement. Meanwhile, this study also covers how the size, shape and arrangement of the stiffened plate influence the reduction of its vibration. Due to these research, I initially ascertained the structure of the pattern plate, which includes cross-shaped, well-shaped, encryption strip 2, inverted U2 stiffened model plate.Besides, this paper also analyzes the mechanism of the shock absorption of the additional damping structure and deduces the equation with restrained loss factor of the additional damping structure using the complex stiffness method. According to the resulting curve, some parameters matching the composition are selected. Based on the original structure of the train head skin, we analyze the vibration reduction of the constrained composite damp and reveal the effect of the stiffness parameter Y on the vibration reduction of the constrained damp. We reach the conclusion that it can achieve better behavior of the vibration reduction when Y is 5-7.Using the method of modal displacement, panel participation and modal strain energy, the effects of constrained damp are studied. The damping effects of constrained damp based on the modal strain energy principle are verified by experiments. The influences of the constrained damping’s notch on the vibration are analyzed. The results is that the laying of constrained damping should be based on modal strain energy principle as to get better performance.Due to the characteristics on the vibration reduction analysis of skin structure and additional damping structure, the models are used to simulate the two vibration reduction measures. And the cross-shaped arrangement’ modal strain energy of the cab has been calculated and then the constrained damp of No.52 has been used locality. The research results verifies the optimized skin structure’s shock absorption effect is 10 d B higher than that of the original structure.