Research On Testing Methods Of High-speed Train Bogie Natural Frequency

Railway is one of our country’s major modes of transportation, whose trafficcapacity accounts for more than1/3of total passenger traffic turnover each year. Aftersix times speed raising, china railway has officially entered the era of high-speed rail.Our country’s operation mileage of high-speed rail has reached more than6800kilometers. The advantage of high-speed train is obvious, but there are also manyproblems to be solved.Bogie as the key component of the train, pass the random excitation of the orbitto the body. Bogie’s dynamic performance and vibration analysis are becoming moreand more important. The random excitation frequency domain is within allowableregion, when vehicles are running at a low speed. The random excitation frequencyband is wide, when vehicles are running at a high speed. When the random excitationfrequency is equal or close to the natural frequency of the vibration system, it maycause parts of the vibration system response, and cause vibration displacement rapidlyincreased. Vibration role in passengers passed through the body, which will affectpassenger comfort of the vehicle. A variety of coupled vibration can cause fatiguedamage of the components, and affect the service of the train, and even affect theoperation safety of the train. A variety of coupled vibration may bring noise, affectingpassenger comfort and other problems. Therefore, it is necessary to study the naturalfrequency of the high-speed train bogie.Study on the structure and operating characteristics of high-speed train bogie,and establish the vertical and the transverse vibration model of the bogie according tothe basis of its movement forms and its vertical and transverse vibration are weaklycoupled. Listed the equation of motion for each vibration model according toNewton’s second law, and simplified the equation for natural frequency with equationstate. Calculate each bogie vibration model based on the calculating modal analysistheory, and obtain its natural frequency. The results and ALSTOM parameters arebasically same, which show that the dynamic model is right.Focused on the vibration influence on the high-speed running quality, thedetecting methods of bogie frequency at home and abroad were fully studied, and thenbased on the existed standards, a new measuring method as well as the high-speedtrains vertical and lateral vibration test models of bogie frequency were put forward. Simulated and analyzed the key mechanical components of the test bench to validatewhether the test bench meets the functional requirements or not. Besides, the paperdeveloped the data collecting and analysis system of the test bench, and chosereasonable equipments for LMS SCADAS and LMS Test Software.CRH5bogie, for example, is modal analyzed by using SIMPACK (Wheel/Rail)software. First create the virtual model of the CRH5bogie, and then create virtualmodel of the CRH5train system based on the first step. Set parameters of the modelbased on the natural frequency test model and test methods above mentioned, andsimulate the bogie natural frequency test progress and verification whether the testmethod is reasonable. Finally, prove the test modal and the test method is correct, andthe test bench we developed is reasonable according to the simulation results.In summary, the paper established a test model and a test system for testing ofhigh-speed train bogie. The test method can obtain the high-speed train bogiefrequency fast and accurately. It helps us to enhance the high-speed train runningperformance, and reduce the development cycle and R&D costs of bogie, with greateconomic and social significance.