| Excitation role of wheel-rail, effect of high-speed bogie suspension high frequency impedance and body structure characteristics to become the three major factor,which affecting the quality of vibration under its flexible body and car. For high-speed railway vehicle, the body of the running gear interface adds new factors, such as the Japanese vehicle secondary suspension using Japanese air spring,which leading to non-linear effects of thermodynamics air springs, forming a vertical vibration transmission mechanism. For European vehicles, ICE3series bogie five technological innovation lies in how to achieve energy absorption band of the anti-hunting mechanism to focus on solving the bogie instability, therefore anti-hunting has become a high-impedance effect of influencing factors for the new body to running gear, and then forming a body lateral vibration coupling mechanism. According to high-speed rail vehicle vertical vibration transmission mechanism particularity and European vehicle bogie technology innovation, this paper use of rubber hanging "floating board effect" to solve the problem of lateral vibration of the vehicle body, and presents a simulation technology based on rigid coupling under the flexible body and vehicle quality rubber hanging verified optimization method.Flexible body vertical acceleration response band broadening is become the Japanese vehicle speed is300km/h running common problems, while Japanese air spring "hard suspension" is the key factor. The small defects of track caused by forced vibration response of the bogie frame, thereby exposing the aluminum alloy body "no skeleton without stringers" structural weakness, and caused mass resonance under the car and install hanger fatigue cracking. For the European Ashkenazi air spring vehicles using "soft suspension", the body vertical vibration problem does not exist. Under active vibration excitation to the car, flexible body validation showed that:the vehicle floor with a " middle small and ends of big vibration characteristics. To assess comfort floor, allowed active Excitation intensity is small, such as good comfort, and its active Excitation intensity equivalent to only cooling fan. Therefore, lightweight body design should pay attention to the details of the following three questions:floor vibration sensitive parts, rubber hanging constrained damping effect flooring comfort evaluation.Lateral vibration coupling mechanism refers to the secondary lateral suspension constitutes a body of running gear interfaces lateral transfer medium frequency vibration coupling mechanism, and it has anti-hunting frequency impedance, a large body damping shaking and aluminum body structure three major weaknesses particularity. Under vehicle equipment, the lower body one step lateral bending mode frequency is only14.2Hz. The modal vibration technology service life of the vehicle will be30years wreaks negative impact. For the quality of rubber hanging, proportional damping is one of the positive factors under lateral vibration suppression vehicle quality, and the floor of the central body is with extreme lateral acceleration characteristics, namely proportional damping take0.5%of its full-range domain (RMS)3a minimum. Thus, the quality of rubber hanging under the car body lateral vibration is mainly to solve the problem, rather than vertical vibration hanging usual sense.Also we should be noted that the rubber hanging damping technology limitations:the very conditions in running gear, there is a possibility the transverse mass coupled vibration is large vehicles, which causes weight wedge failure; If the rubber hanging damping is too large, such as proportional damping3%, aluminum body lateral difficult excitation energy release, the car will appear larger than the lateral vibration anomalies under the car. |
PDF Full Text Request