Based on the meshing theory of silent chain, a new type of silent chain transmission system, the multi-phase Hy-Vo silent chain transmission system is proposed. The calculation method of the involute ...tooth profile equation for each phase sprocket is presented. The meshing design system is built. The Fourier series of lateral fluctuation quantity is established. The rationality of design and calculation is verified by computer simulation analysis. Compared with single-phase and double-phase silent chains, the polygonal effect of multi-phase Hy-Vo silent chain transmission system is smaller. It could provide a theoretical basis for the multivariate variation of silent chain.
Communicated by John McPhee.
A crawler system provides much larger ground contact, leading to excellent terrain adaptability. Due to its structural characteristics, high‐frequency vibration proportional to the vehicle speed is ...generated during the driving process. This is a result of the polygon and rolling effects between the track and the wheels. A field test of a tracked vehicle is performed to monitor movement signals of the chassis and a rocker arm. Their corresponding power spectral density distributions confirm the correctness of the frequency‐calculation equation. Then, a novel elastic track tensioning device with a damper is designed as a cushion between the idler and the chassis. Depending on its geometry, the equivalent damping coefficient for a dynamic model is evaluated. Subsequently, the damping is altered in response to different operating conditions by a hybrid damping fuzzy semiactive control system. The controller accounts for both chassis and track vibration. Based on the transfer matrix method for multibody systems, a dynamical model of the track system is developed. Control performances are evaluated using two numerical simulations of obstacle crossing and off‐road driving operations. Results indicate that the proposed semiactive tensioner is substantially better than the conventional one. This paper provides a novel feasible scheme for vibration reduction of tracked vehicles.
Based on the meshing theory of the Hy-Vo silent chain plate-sprocket-cutter system, the basic meshing design system of dual phase Hy-Vo silent chain is built. The polygon effects of Hy-Vo silent ...chain are contrastingly analyzed through the geometrical analysis method in one-phase and dual phase transmission systems. The ideal multi-variation conditions of the parameters of Hy-Vo silent chain are reached. The calculation of inner meshing overhang is pointed out in dual phase transmission system. Combined with a specific example, the multi-body dynamic model of inner–outer meshing Hy-Vo silent chain is established in dual phase transmission system, and the relations of system fluctuation quantities are analyzed. The research shows that as the parameters of inner–outer meshing Hy-Vo silent chain in dual phase transmission system become closer to the ideal multi-variation conditions, the polygon effect is smaller. It could supply the theoretical basis for the parameter design of multi-variation of dual phase Hy-Vo silent chain transmission system, and provide the theoretical instruction for the dynamic meshing analysis of dual phase Hy-Vo silent chain transmission system.
•Obtained the ideal multi-variation conditions of the parameters of Hy-Vo silent chain through the polygon effect analysis•Established the accurate multi-body dynamic model of Hy-Vo silent chain in dual phase transmission system•Reduced the fluctuation quantity and the polygon effect of the drive system•Proved the correctness of the conditions through the practical calculation and the simulation analysis•Provided the theoretical instruction for the dynamic meshing analysis of Hy-Vo silent chain in dual phase transmission system
The rubber track system can be quickly swapped on the tyres, exerting a smaller ground pressure while generating a greater adhesion to solve the problem vehicles faced in traversing rough and ...difficult terrain. This paper will discuss the influence of rubber track system on the ride comfort of engineering vehicles with rigid suspension. First, a multi-body dynamic model of the rubber track system and a mathematical model of contact between the ground and the track are established, and then the macro commands are programmed to add many complex contact forces. Moreover, by using the method of physical prototype obstacle testing, the correctness of the simulation model is validated. The ride comfort of the engineering vehicle when equipped with rubber track system is explored by the method of the multi-body dynamics and real vehicle test. The research shows that a flexible roller wheel system can significantly improve the ride comfort of the engineering vehicle when compared to wheeled vehicles. When the vehicle speed is low, the weighted root-mean-square acceleration of the wheeled vehicle and tracked vehicle is almost the same. At the same time, it is verified that the ride comfort of the steel-chain tracked vehicles is worse than that of rubber tracked vehicles, due to the polygon effect. Through the multi-body dynamics simulation of the virtual prototype, we can predict and evaluate the ride comfort of vehicles, saving the cost of testing and obtaining the actual experimental data, which has great significance for the research and development of vehicles.
analyzes the polygonal effect of the chain drives by analyzing the chain velocity and angular velocity change of driven sprocket. In order to abate polygon effect and improve the performance of chain ...transmission, advanced production technology should be adopted.
The polygon effect is a major factor affecting the dynamic characteristics of chain drive in oil saw chain system. It causes impact, noise and dithering of the saw chain and significantly affects the ...lifespan of oil saw. A simple analytical method is proposed for analyzing the dynamic response resulting from the polygon effect of an oil saw chain system by using the difference method for numerical approximation. A MATLAB program is implemented and then applied for the polygon effect analysis of a specific saw chain drive. Numerical results such as velocities and dynamic loads due to polygon effect are compared with experimental data to demonstrate the effectiveness of the new method. A good agreement is obtained. The proposed polygon effect analysis method can provide guidelines for oil saw chain design for better dynamic performance.
This paper mainly studies the chain of scraper conveyor and analyzes the dynamic characteristics of the chain in the condition of load and load free. Numerical simulation, including the speed of ...movement and the simulation of chain tension, is used to simulate the special points of scraper conveyor chain. By a series of simulations, the experimental results show that the number and pitch of the sprocket are the main factors that influence the dynamics of the chain, making the chain produce polygonal effect. Above all, the simulation data shows that the movement is relatively stable and the fluctuation decreases with the increase of the number of sprocket. In the case of load, the tension of the chain tensioning force obviously increases, and the polygon effect of the chain is intensified. Therefore, this paper hopes to provide some theories and basis for production activities by studying the chain of scraper conveyor.
This paper carries out a detailed research on the application performance and the polygon effect of chain transmission. This paper mainly adopts the following methods to realize the compensation of ...polygon effect: by use of variable pitch roller chains, the chain centerline is kept at the minimum intercross position with the sprocket pitch circle. Thus, the polygon effect of chain transmission under constraints is effectively improved, and the transverse vibration of the chain centerline during the transmission process has been weakened and eased.
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