Abstract
In this paper, a dynamic-balancing testing system is designed. The innovative feature of the testing system is the dynamic balancing of the rotor system with robustness and high balance efficiency which meets the requirements of engineering application. The transient characteristic-based balancing method (TCBM) interface and the influence coefficient method (ICM) interface are designed in the testing system. The TCBM calculates the unbalance by the transient vibration responses while accelerating rotor operating without trail-weight. The ICM calculates the unbalance by the steady-state vibration responses while the rotor system operates with trail-weight and constant speed. The testing system has the functions of monitoring operations synchronously, measuring and recording the required vibration responses, analyzing the dynamic characteristics, and identifying the unbalance parameters. Experiments of the single disc rotor system are carried out, and the maximum deflection of the measuring point has decreased by 73.11% after balancing by the TCBM interface. The maximum amplitude of the measuring point at 2914 r/min has decreased by 77.74% after balancing by ICM interface, while the maximum deflection during the whole operation has decreased by 70.00%. The experiments prove the effectiveness of the testing system, while the testing system has advantages of convenient and intuitive operation, high balance efficiency, and security.
Highlights
Rotating machinery is widely used in power generation, petrochemical, metallurgy, aerospace, and other fields for its rotating function required in special working conditions
We proposed a novel method for balancing the rotor system without trail-weight which is named the transient characteristic-based balancing method (TCBM)
We designed a dynamic-balancing testing system for the flexible rotor system, whose innovative features are the interfaces according to the principles of TCBM and influence coefficient method (ICM) for dynamic balancing of the rotor system. e functions of the testing system are monitoring the operations of the rotor synchronously, measuring and recording the required vibration response of the rotor, analyzing the dynamic characteristics of the rotor, and identifying the unbalance parameters of the rotor. e experiments of the single disc flexible rotor are carried out to detect the functions of the testing system and verify the effectiveness of the dynamic-balancing method
Summary
Rotating machinery is widely used in power generation, petrochemical, metallurgy, aerospace, and other fields for its rotating function required in special working conditions. Bin et al [29, 30] investigated the weighted influence coefficient matrix by adding simulated exciting force to the finite element model of the multidisc series shafting rotor system and identified the unbalance of the rotor system by the ICM without trailweight. Li et al [31] calculated the dynamic characteristics of the rotor by finite element analysis and identified the unbalance of the four-disc supported structure rotor and turbo-shaft engine power turbine rotor by N and N + 2 plane MBM without trial weights, respectively. Ye et al [32] introduced dynamic similitude theory and dimensional analysis method for optimizing the ICM and proposed the balancing method without trial weights by analyzing the similitude relationship of the influence coefficient between similarity and prototype rotor system. To verify the balancing effect of the dynamic-balancing testing system, the dynamic-balancing experiments of a single disc rotor system are carried out in Section 4. e balancing results prove that the dynamicbalancing testing system can be effectively applied to the field of dynamic balancing, while the testing system owns the benefits of concise interfaces and high balancing efficiency and security
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