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- 저자 : Pingbo Wu (검색결과 2 건)
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Flexible vibration analysis for car body of high-speed EMU
Huailong Shi,Pingbo Wu 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.1
The resonance of the flexible vibration of car body, which has not been detected before on a passenger coach, occurred recently on ahigh-speed Electric multi units (EMU) when the train was running at 300 km/h on Beijing-Shanghai line. In this investigation, the forcetransmission from track to car body via suspensions is elaborated first with possibly induced factors briefly discussed. Both the measurementsand experiments in field and in laboratory were conducted to evaluate the resonances and the excitation as well as transmission. Moreover, a three-dimensional railroad vehicle model was built in a computational non-linear Multibody system (MBS) framework, inwhich the car body flexibility was modeled using Finite element (FE) method. The model was validated and shows good agreementswith measurements. Furthermore, the measured wheel and rail profiles were used to analyze the wheel/rail interaction for both new andworn states. The effects of the wheel-rail contact conditions on stabilities, dynamics and riding comforts were also examined. Feasiblesolutions were promoted to avoid the resonance and following by validating tests. It shows that the high frequency excitation arises fromthe hunting motion of bogie that closes to the modals of the car body, leads to the resonance of the structure of the car.
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The Application of Hilbert-Huang Transform in the Abnormal Vibration Analysis for Metro Vehicle
Qiuze Li,Huailong Shi,Jianbin Wang,Pingbo Wu 한국도시철도학회 2014 IJAR Vol.2 No.1
The time-frequency analysis method Hilbert-Huang Transform (HHT) is applied in the signal processing for metro vehicle, in order to analyze and research the reason of abnormal vibration of carbody floor. The linear superposition property and the actual physical meaning of marginal spectrum are demonstrated to assess the vibration characteristic of structure. The rail vehicle is a nonlinear system and unsteady process. All kinds of frequency domain analysis method based on Fourier Transform is short to study on the un-linear and unsteady system, cannot use it to search the abnormal vibration reason. HHT is an effective tool to research the nonlinear and unsteady process, describing the vibration amplitude changing process with time and frequency. Compared to the test results and considered that the abnormal vibration frequency come from the two times frequency components about the traction motor rotating speed which is transferred to the floor through the vehicle suspension system. The frequency is close to the natural frequency of local floor and stimulates local elastic vibration of the floor significantly. At last, the paper pointed that the frequency component maybe caused by the misalignment of flexible-coupling.
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