Abstract
A crankshaft assembly has different structure and dynamic characteristics than a normal revolved body, which leads to problems in dynamic balance measurement and imbalance compensation of it. The traditional method used to measure crankshaft assemblies is too inefficient to meet the modern manufacturing industry's requirements. Inspired by the challenges, methods for dynamic balance measurement and imbalance compensation of it are proposed in this paper. First, three typical dynamic balance models of a crankshaft assembly are built for different unbalanced mass distributions. Then, the unbalanced inertial force and unbalanced characteristic parameters are formulated and analyzed. Based on dynamic balance modeling and synthesis, an imbalance compensation method is proposed by drilling-out at a specific angle of the crankshaft. Finally, the dynamic balance measurement experiment is conducted, and the results validate that the proposed method is fast and accurate.
Highlights
A crankshaft assembly or crankshaft connecting rod piston assembly in a motorcycle engine [1] has a different structure and dynamic characteristics than a nominal revolved body, such as motor rotor, fan rotor
The shape of the inertial forces curve has a direct impact on the vibration of a motorcycle, and the vibration of a motorcycle engine is a significant problem in motorcycle design and manufacturing, especially for the single-cylinder unbalanced shaft engine [4]
To address the challenges of measuring and compensating for an unbalanced crankshaft assembly, a dynamic balance measuring and unbalance compensating method is proposed in this paper for industrial motorcycle engine testing and correcting
Summary
A crankshaft assembly or crankshaft connecting rod piston assembly in a motorcycle engine [1] has a different structure and dynamic characteristics than a nominal revolved body, such as motor rotor, fan rotor. It is necessary to develop a new method for measuring crankshaft assembly dynamic balance while considering both efficiency and accuracy. The balance mass method is used to transfer the mass of the connecting rod to the crank and the slider It can only partially balance the vertical inertial force. The third way is the overbalance method [17], which is a method of controlling the magnitude and direction of inertial forces by reserving an unbalanced mass at a certain position on a crankshaft. To address the challenges of measuring and compensating for an unbalanced crankshaft assembly, a dynamic balance measuring and unbalance compensating method is proposed in this paper for industrial motorcycle engine testing and correcting. Regarding the measurement of a crankshaft assembly, dynamic models are derived and analyzed for different unbalanced mass distributions.
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