Abstract
Mechanical properties of floor prototypes made for high-speed trains from composite multilayer floor structures of different materials and thicknesses were tested. Based on the test results, the equivalent mechanical parameters of different layers of the panels, core materials, etc., were calculated, and the multilayer mixed finite element model of the floor was built and verified. The multilayer mixed floor model was introduced into the car body of a high-speed train, and the test signals of the high-speed train were used as inputs to calculate the vibration response of composite floor structure. Vibration spectra of the high-speed train composite floor made of different materials and structures were compared and analyzed. The results show that the calculation of the floor vibration response of the vehicle car body within the framework of the equivalent model of the multilayer structure based on the mechanical performance test is an effective method to evaluate vibration characteristics. The vibration isolation performance of the stainless steel panel floor is better than that of the aluminum alloy panel, but its large mass is not favorable in lightweight body design. The vibration energy of birch core material floor is significantly smaller than the alder core material of the same size. The vibration isolation performance of the floor enhanced with the increase in the thickness of the outer metal panel, but when the outer metal panel thickness exceeds 0.8 mm, the influence becomes small. Therefore, the stainless steel-birch core composite floor with a large panel thickness has the best vibration isolation performance and can be used for the floor above the bogie and the suspended excitation source. Then, an optimal analysis considering mass and vibration characteristics was carried out, and the results show that there exists an optimal solution for the high-speed train. Regarding the overall design basis of the vehicle, the aluminum alloy panel lightweight structure can be used in combination with other general parts.
Highlights
With the rapid development of China’s high-speed rail transit system, excellent ride comfort and the safety of train operations are important issues of high-speed train vehicle design
Test Results Analysis. e bending stiffness and shear stiffness of the composite multilayer panel structure can be determined by three-point bending of the long panel sample, and the elastic modulus of the panel and the shear modulus of the core material can be calculated
The floor structure deformation relates to the linear part of the curve
Summary
With the rapid development of China’s high-speed rail transit system, excellent ride comfort and the safety of train operations are important issues of high-speed train vehicle design. Due to the high speed of the train, the increased excitation energy of wheel and rail interaction and the lightweight design lead to aggravation of the flexible vibration of the vehicle car body structure [1,2,3,4]. E influence and rules of different composite flooring materials and structural distribution on train floor vibration are not yet clear. Based on test results of the mechanical properties, the equivalent material parameters of the composite structure are calculated. E model of vehicle car body structure containing the multilayer panel car floor was calculated. Using the on-site measured vibration data of the high-speed train car body underframe as the excitation, the vibration characteristics of floors with different composite structures were obtained, which provides a basis for an optimal design of high-speed train floor parameters in the future. According to the bending performance test standard, the bending stiffness and the shear stiffness were measured through the three-point bending test of outrigger samples with multilayer structures [20], as shown in Figure 4. e span of the outrigger is l 200 mm, and the outer elongation is a 100 mm. ereby, the elastic modulus of the panel structure and the shear modulus of the core structure could be calculated. e compressive strength test and tensile strength test were carried out to obtain the flat pressure value, flat tensile strength, and flat elastic modulus of each floor structure sample
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