Based on the mechanism of secondary couple caused by cardan joint, this paper analyzes the reasons for the secondary couple and second-order vibration of a 4WD driveline resulting from cardan joint excitation. According to test results, the paper analyzes the influence parameters, including variation of propeller shafts' angle, selection of joint type, input torque of propeller shaft, and rigid body modes of rear axle, on the second-order vibration. Finally, the paper provides the control methods to reduce the second-order vibration caused by the cardan joints.Keywords Cardan joint Á Second-order vibration Á 4WD Á Rigid body mode of axle Á ODS
IntroductionCurrently, the four-wheel drive (4WD) system is widely used in sports utility vehicle (SUV) due to the increasing demand of fuel efficiency and dynamic performance by customers. Generally, there are two kinds of 4WD systems, one based on the front wheel drive (FWD) system and the other based on the rear wheel drive (RWD) system. The FWD system has been more and more popular. The customers and manufacturers have already paid more and more attention to the noise, vibration, and harshness (NVH) problems caused by the driveline of 4WD vehicle.
This study investigates the steady state dynamic interactions between a vehicle and guideway of a high-speed ground transportation system based on magnetically levitated (Maglev) vehicles. The guideway is assumed to be made up of identical simply supported beams with single spans and rigid supports. The vehicle is considered two-dimensional, with numerous degrees of freedom representing the passenger cabin and primary and secondary suspensions of the vehicle with lumped masses, linear springs and dampings. The Bernoulli-Euler beam equation is utilized to model the characteristics of a flexible guideway, and the guideway synthesis is based on a modal analysis method. The dynamic behaviors of both vehicle and guideway are then simulated to investigate how the locations of the passenger cabin mass of center and asymmetric suspension characteristics of the vehicle suspensions influence high speed vehicle-guideway interaction. Finally, simulation results are compared. Results of this study provide basic design guidelines for Maglev vehicle-guideway systems.
This study investigates the dynamic interactions between a vehicle and guideway of a high-speed ground transportation system based on maglev vehicles. The guideway is assumed to be made up of identical simply supported beams with single spans and rigid supports. The vehicle is considered to a two-dimensional vehicle model with primary and secondary suspensions. Three kinds of loading modes acting at each beam of guideway are first developed according to the locations of suspensions of vehicle. Coupled equations of motion of both vehicle and guideway in various loading modes are derived and solved by using numerical integration method. The simulations have been performed to investigate the parameters of vehicle/guideway system which may affect the steady-state responses of the vehicle and guideway.
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