Random Response Analysis Of Equipment Suspension At The Bottom Of The Body

The train is affected by external loads during operation, and track irregularity is the main external load, has obvious characteristics of random, making the train random vibration. With the increase of the train speed, making excitation frequency domain widen caused by random track irregularity, which cause local elastic vibration of the train highlights, finally, affecting the dynamic characteristics of the vehicle. High-speed trains equipped with all kinds of lifting equipment, is necessary to ensure the safe operation of trains, therefore, under high-speed operation, the lifting equipment will cause what kind of influence on the vibration of vehicle, and how lifting parts corresponding bodywork of lifting equipment could vibration law, which problems getting the attention caused by the vehicle workers.Solving random vibration is directing statistics, enormous amount of calculation, using traditional random vibration theory, but counting methods are complex, and usually only deal with simple structure model. Solving the traditional vehicle dynamics, only use multi-body model or rigid coupling model for analysis, without considering the elastic vibration structure. Due to the rough model, the number of degrees of freedom is low, and unable to get detailed information of local vibration, and both of the models are difficult to overcome increased calculation due to increasing degree, causing distortion calculation problems. In the past the low speed of train running, the calculation results using the above models can also accept, but faced with the development trend of high-speed vehicles, and elastic vibration of the structure cannot be ignored, therefore, the conventional method cannot satisfy the requirements analysis. Therefore, achieving random vibration analysis of high-speed vehicles is thorny problem of the world about railway science researchers.In this paper, using the research group developed rail vehicle random vibration efficient algorithm, making the pseudo excitation method and modal superposition combine to establish fine establishment vehicle dynamics model, which analyze lifting equipment about random vibration problems, and detailed study of the effect of lifting equipment vehicle vibration. Study random response of layout from lifting equipment, lifting the way, research equipment to the vehicle center of gravity height. Through simulation analysis, it is found that vertical acceleration power spectrum has achieved maximum at a frequency of8Hz located at both ends of the tank and the chassis lifting charging machine parts, respectively0.18(m/s2)2/Hz and0.1-15(m/s2)2/Hz.The vertical acceleration power spectrum of the main transformer lifting located in the middle of body parts has achieve0.1\5(m/s2)2/Hz at a frequency of20Hz.The farther the distance of the center of mass of lifting equipment to the chassis plane, the bigger the roof lateral vibration acceleration power spectral, little effect on the vertical vibration, in line with the actual situation. Find the optimal layout of lifting equipment, and the heavier equipment is located in the middle chassis, more favorable for body vibration.