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RISS 인기검색어
- 검색키워드
- 저자 : Hongliang Yao (검색결과 8 건)
- 무료
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- 유료
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Vibration control of rotor system by ultrasonic excited limiter
Hongliang Yao,Qian Zhao,Hao Wu,Bang-chun Wen 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.5
We propose a novel method with an ultrasonically excited structure as a vibration limiter to control the vibration of rotor systems. Thefriction between the rotor and the limiter is significantly reduced by ultrasonic lubrication, thereby preventing the occurrence of rubbinginducedthermal bowing, which is commonly observed in traditional vibration limiters. In our study, the friction reduction mechanism ofthe ultrasonically excited vibration limiter was first examined based on tribology theory and Hertz contact theory. The vibration controleffects and the alleviation of thermal bowing were then investigated by numerical simulation. Finally, vibration control experiments wereperformed on a Bentley test rig with the ultrasonically excited vibration limiter. The consistency between theoretical and experimentalresults confirmed the effectiveness of the proposed method.
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A tunable dynamic vibration absorber for unbalanced rotor system
Hongliang Yao,Tongzhao Wang,Bang-chun Wen,Baijun Qiu 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.4
A tunable dynamic vibration absorber for unbalanced rotor system which is made up of coil springs and magnetic spring is presented. The structure of the absorber is introduced and the stiffness tuning mechanism of the magnetic spring is explained. A finite element model of the rotor-absorber system was built and the influencing factors to the appearance of the absorber were studied numerically. Finally, experiments were carried out to verify the numerical results, and PID control strategy was tested. The numerical and experimental results show that the present absorber is effective for vibration suppression of an unbalanced rotor system, and the control strategy is effective.
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Detection of rubbing location in rotor system by super-harmonic responses
Hongliang Yao 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.8
A detection strategy for the rubbing locations in a rotor system based on the super-harmonic responses is developed. Firstly, the dynamics of the rotor system with rubbing fault is investigated based on the theory of nonlinear output frequency response function. Then,the relationship between the super-harmonic components of the vibrations of fault rotor system and the receptance matrix of the fault-free rotor system is established. The detection method is then set up for rubbing location along the rotor. With this approach, the rubbing location can be determined by using super-harmonic responses measured at only two nodes under one case of operating speed. Finally, numerical simulations and experimental observations are carried out to verify the efficiency of the proposed detection method for rubbing location in a rotor system.
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Optimal design for torsional vibration suppression of non-smooth NES
Yanbo Cao,Hongliang Yao,Jinxin Dou,Shengdong Han 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.11
Nonlinear energy sinks (NESs) have received increasing attention for their ability to passively inhibit a large amount of vibration energy over a wide range of frequencies. However, although many studies have focused on dynamics of NES, few have addressed the optimal design method of NES, especially for the non-smooth NES (NSNES). Therefore, the parameter optimization method for an NSNES which can be applied to supress torsional vibration of rotor system was developed. First, the design variables were reduced by using piecewise linear torsional stiffness to equivalently fit cubic torsional stiffness; then, taking the torsional vibration of single-disk rotor system as an example, the genetic algorithm (GA) was used to solve the optimization problem of the NSNES in torsional vibration suppression of rotor system. Finally, the optimized NSNES was verified by numerical simulation and experiment to suppress the torsional vibration of a rotor system. The results show that the optimally designed NSNES can effectively suppress torsional vibration of a rotor system. In transient vibration suppression, the optimal percentage of accumulated energy dissipation of NSNES can reach 95.3 %. For steady-state vibration suppression, the peak vibration suppression of NSNES can reach 82.2 % in the simulation and 81.9 % in the test.
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Prediction method for steady-state response of local rubbing blade-rotor systems
Qian Zhao,Hongliang Yao,Qi Xu,Bang-chun Wen 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.4
Blade-rotor systems frequently encounter the problem of blade-to-case rubbing, which affects their safety and stability. Numericalsimulation can be used to predict the steady-state response of these systems. However, such simulation is frequently computationallyexpensive because of the high dimensions of the dynamic model of a blade-rotor system. To overcome this problem, a new method thatcombines the receptance-based dimension-reduction approach with the incremental harmonic balance (IHB) method is presented in thisstudy. First, a dynamic model of a blade-rotor system is developed using the finite element method, and the number of dimensions of themodel is reduced by the receptance method. Subsequently, the steady-state response is obtained by the improved IHB method to convenientlymanage the large number of super-harmonic components of the local rubbing system. Finally, the precision and efficiency of theproposed method is verified by comparing its results with those obtained by the Newmark-b method. The proposed method is found to beefficient in analyzing local rubbing blade-rotor systems with high dimensions, local nonlinearities, and rich super-harmonics.
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Combination algorithm for cracked rotor fault diagnosis based on NOFRFs and HHR
Yang Liu,Yulai Zhao,Jiyuan Han,Qingyu Meng,Hongliang Yao 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.4
In this paper, a combination algorithm for diagnosing rotor crack fault is presented. Firstly, the nonlinear output frequency response functions (NOFRFs) are used to analyze the severity of crack damage in the rotor system qualitatively. The NOFRFs are obtained by processing the vibration signal through the nonlinear output frequency response functions. Further analysis of the NOFRFs can determine the crack depth qualitatively. Secondly, the position of the crack is then located using the crack position index (CPI) l based on the higher harmonic response (HHR) and the dynamic compliance matrix. The simulation and experimental results show that the G 2 (j2w F ) in NOFRFs is very sensitive to crack depth, and the crack position index (CPI) l can determine the shaft segment effectively where the crack is located. The advantage of this combination algorithm is that it can detect the crack faults by measuring the vibration signal of the cracked rotor at two speeds, which makes the measurement process more simplified and reduces the measurement time for real-time monitoring. At each speed only the vibration response of the two nodes need to be measured, which greatly reduces the number of sensor used in the measurement process and reduces the cost of monitoring. The combination algorithm can diagnose cracked rotor faults effectively and has certain application value in the diagnosis of cracked rotor fault.
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