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Theoretical and Experimental Study on the Performance of Hermetic Diaphragm Squeeze Film Dampers for Gas-Lubricated Bearings
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作者 Jianwei Wang Haoxi Zhang +3 位作者 Shaocun Han Hang Li Peng Wang Kai Feng 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2024年第3期151-169,共19页
Low damping characteristics have always been a key sticking points in the development of gas bearings.The application of squeeze film dampers can significantly improve the damping performance of gas lubricated bearing... Low damping characteristics have always been a key sticking points in the development of gas bearings.The application of squeeze film dampers can significantly improve the damping performance of gas lubricated bearings.This paper proposed a novel hermetic diaphragm squeeze film damper(HDSFD)for oil-free turbomachinery supported by gas lubricated bearings.Several types of HDSFDs with symmetrical structure were proposed for good damping performance.By considering the compressibility of the damper fluid,based on hydraulic fluid mechanics theory,a dynamic model of HDSFDs under medium is proposed,which successfully reflects the frequency dependence of force coefficients.Based on the dynamic model,the effects of damper fluid viscosity,bulk modulus of damper fluid,thickness of damper fluid film and plunger thickness on the dynamic stiffness and damping of HDSFDs were analyzed.An experimental test rig was assembled and series of experimental studies on HDSFDs were conducted.The damper fluid transverse flow is added to the existing HDSFD concept,which aims to make the dynamic force coefficients independent of frequency.Although the force coefficient is still frequency dependent,the damping coefficient at high frequency excitation with damper fluid supply twice as that without damper fluid supply.The results serve as a benchmark for the calibration of analytical tools under development. 展开更多
关键词 Hermetic diaphragm squeeze film damper COMPRESSIBILITY Dynamic model Experimental studies
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Research on a Rigid Rotor-Sliding Bearing System with a Squeeze Film Damper 被引量:2
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作者 LUYong-zhong LIAODao-xun 《Journal of Shanghai University(English Edition)》 CAS 2001年第3期224-229,共6页
In this paper, a dynamic model on a rigid rotor sliding bearing system with a SFD is established. The stability and bifurcation behaviors of the system are studied. On the basis of the differential equations of fluid... In this paper, a dynamic model on a rigid rotor sliding bearing system with a SFD is established. The stability and bifurcation behaviors of the system are studied. On the basis of the differential equations of fluid momentum and mass continuity, the distribution pressure function is derived by taking oil film inertia force into consideration. Damping force, clearance excitation force, interference force of different frequencies and static load are also considered in the model. Finally, the governing equations of the stability and bifurcation behaviors of the system are solved by Floquet theory. Simulation of dynamic model shows that the rigid rotor sliding bearing system can maintain stability and exhibit a Hopf bifurcation phenomenon in a certain range. 展开更多
关键词 squeeze film damper(SFD) sliding bearing rigid rotor STABILITY
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STATIONARY DYNAMIC CHARACTERISTICS ANALYSIS OF NEW SQUEEZED FILM DAMPER 被引量:5
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作者 JIANG Hongyuan ZHANG Ruihua XIA Yuhong 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2006年第3期442-445,共4页
Recur to multi-hole and better elastic characteristics of metal rubber (MR), a new squeezed film damper with MR (SFD/MR) throttle ring installed on the end of MR and MR damping ring installed on the radial directi... Recur to multi-hole and better elastic characteristics of metal rubber (MR), a new squeezed film damper with MR (SFD/MR) throttle ring installed on the end of MR and MR damping ring installed on the radial direction of MR is implemented. Based on the D'alembert principle, a locomotion equation and the mathematical model of stationary response of SFD/MR system is put forward. It proves that the SFD/MR has better ability to resist unbalance loads than the traditional SFD after the stationary dynamic characteristics of the traditional SFD and the new SFD/MR are researched. 展开更多
关键词 Metal rubber squeezed film damper Stationary dynamic characteristics
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Experimental study on vibration suppression in a rotor system under base excitation using an integral squeeze film damper 被引量:4
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作者 Yan Wei He Lidong +2 位作者 Zhu Gang Wang Shengli Deng Zhe 《High Technology Letters》 EI CAS 2020年第4期349-359,共11页
Base excitation is one of common excitations in rotor system.In order to study the dynamic characteristics of rotor systems under base excitation and the effect of integral squeeze film dampers(ISFDs)on their dynamic ... Base excitation is one of common excitations in rotor system.In order to study the dynamic characteristics of rotor systems under base excitation and the effect of integral squeeze film dampers(ISFDs)on their dynamic characteristics,a single-disk rotor test rig,where mass imbalance and base excitation could be applied,is developed.Experimental research on the rotor system response under sinusoidal base excitation conditions with different frequencies and excitation forces is performed and the effect of ISFD on the dynamic characteristics of the rotor is investigated.The experimental results demonstrate that when the sinusoidal base excitation frequency approaches the first critical speed of the rotor system or the natural frequency of the rotor system base,strong vibration occurs in the rotor,indicating that the base excitation of the two frequencies has a greater impact on rotor system response.In addition,with the increase of the base excitation force,the vibration of the rotor will be increased.ISFDs can significantly inhibit the vibration due to unbalanced forces and sinusoidal base excitation in rotor systems.To a certain extent,ISFDs can improve the effect of sinusoidal base excitation with most frequencies on rotor system response,and they have a good vibration reduction effect for sinusoidal base excitation with different excitation forces. 展开更多
关键词 Jeffcott rotor dynamic characteristics base excitation integral squeeze film damper(ISFD) vibration suppression
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Experimental Studies on Support Systems of High Speed Motors With Flexible Squirrel-cage Support and Squeeze Film Dampers 被引量:3
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作者 TIAN Ye SUN Yanhua YANG Lihua YU Lie 《中国电机工程学报》 EI CSCD 北大核心 2012年第27期I0010-I0010,186,共1页
以100kW级工作转速为45000r/min的高速永磁同步电机为实验样机,对采用鼠笼式弹性支撑和挤油膜阻尼器的滚动轴承支撑系统进行研究。分析了弹性支撑和挤压油膜阻尼器的刚度和阻尼特性,在此基础上分别计算出刚性支撑和弹性阻尼支撑时轴... 以100kW级工作转速为45000r/min的高速永磁同步电机为实验样机,对采用鼠笼式弹性支撑和挤油膜阻尼器的滚动轴承支撑系统进行研究。分析了弹性支撑和挤压油膜阻尼器的刚度和阻尼特性,在此基础上分别计算出刚性支撑和弹性阻尼支撑时轴承一转子系统的临界转速和瞬态动力特性。最后在样机上进行对比实验,并对电机机壳振动加速度和弹性支撑笼条微应变信号进行分析。结果表明,弹性阻尼支撑可以使转子以较低的转速通过其刚体模态,同时对转子的振动起到良好的抑制作用。实验样机稳定运行在设计工作转速,其分析和实验结果为高速电机轴系设计和动力学分析提供了参考。 展开更多
关键词 高速电机 支持系统 挤压油膜阻尼器 调制解调器 实验 鼠笼 微型燃气轮机 临界转速
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Numerical investigation on damping coefficient of the integral squeeze film damper 被引量:1
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作者 LI Geng HE Lidong +2 位作者 JIA Xingyun ZHANG Yipeng WANG Jian 《High Technology Letters》 EI CAS 2022年第3期317-327,共11页
The elimination of rotor vibration is usually achieved by applying additional damping to the system.Squeeze film dampers are widely used in various aerospace and turbine equipments.The research is carried out on flow ... The elimination of rotor vibration is usually achieved by applying additional damping to the system.Squeeze film dampers are widely used in various aerospace and turbine equipments.The research is carried out on flow characteristics in the integral squeeze film dampers(ISFDs).The dynamic response to the operation condition is investigated through the computational fluid dynamics(CFD) model of ISFD.Due to the large pressure loss at the oil inlet,the oil film force only changes slightly with the increase of oil supply pressure,and the damping increases slightly.The vibration amplitude only affects the film force,but has no effect on the damping.The oil film force and damping show an upward tendency with the decrease of thickness of the end seal clearance. 展开更多
关键词 integral squeeze film damper(ISFD) numerical method oil film force damping coefficient
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Experimental study of suppressing the unbalanced response vibration of rotor system with a G-type integral squeeze film damper 被引量:1
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作者 Yan Wei He Lidong +2 位作者 Zhang Yufei Zhang Yipeng Jia Xingyun 《High Technology Letters》 EI CAS 2021年第1期1-9,共9页
Conventional squeeze film dampers have numerous challenges including lock up,bistable response and incoordinate precession.In order to resolve these nonlinear problems,a novel G-type integral squeeze film damper(GISFD... Conventional squeeze film dampers have numerous challenges including lock up,bistable response and incoordinate precession.In order to resolve these nonlinear problems,a novel G-type integral squeeze film damper(GISFD)is proposed in this research.The experimental test rig is provided to investigate the rotor system with an unbalanced single disk.Numerical simulation results show that the structural design of GISFD is reasonable,which can ensure its safe and stable operation.The influence of different support stiffnesses on the first-order speed of the rotor system is analyzed.Experimental results show that GISFD can effectively suppress the unbalanced response vibration of the rotor.In a certain range,it is found that the suppression effect of GISFD increases with the increase in the kinematic viscosity of the damping fluid.When the silicone oil with kinematic viscosity coefficients v=30.0 cm^(2)/s is employed,the vibration reduction of GISFD is approximately 71.51%.Furthermore,the experimental results show that with the increase of the unbalance,there is a linear relationship between the unbalance and the corresponding amplitude of the unbalanced response.It is concluded that GISFD has excellent linear damping characteristics and reduces the sensitivity of the rotor system to the unbalanced mass. 展开更多
关键词 G-type integral squeeze film damper(GISFD) unbalanced response vibration suppression rotor system dynamic characteristic
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Effect of integral squeeze film damper on vibration and noise of spur gear with center-distance error 被引量:1
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作者 DONG Huaiyu HE Lidong JIA Xingyun 《High Technology Letters》 EI CAS 2022年第4期418-424,共7页
When the actual installation center distance between a pair of spur gears is greater than the theoretical center distance,backlash increases,leading to increased vibration and noise.The structural parameters of an int... When the actual installation center distance between a pair of spur gears is greater than the theoretical center distance,backlash increases,leading to increased vibration and noise.The structural parameters of an integral squeeze film damper(ISFD)were designed with the stiffness of rigid support as reference to investigate the effect of an ISFD on the dynamic characteristics of a spur gear transmission system with center-distance installation error.A spur gear test bench with center distance-error was built to investigate the vibration and noise reduction characteristics of ISFD.The experimental results indicate that,compared with a rigid support,the ISFD can reduce vibration by approximately 40%and noise by approximately 5 d B.ISFD can effectively absorb the impact energy caused by an increase of in backlash,which is conducive to the stable operation of the spur gear transmission system. 展开更多
关键词 dynamic backlash integral squeeze film damper(ISFD) spur gear transmission system vibration and noise control
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Optimization of a Flexible Rotor-Sliding Bearing System With a Squeeze Film Damper 被引量:2
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作者 LUYong-zhong 《International Journal of Plant Engineering and Management》 2004年第1期11-19,共9页
A dynamic model of a flexible rotor-sliding bearing system ( FRSBS ) with asqueeze film damper ( SFD) is established. Considered in the model are oil film inertia force,damping farce, clearance excitation force, inter... A dynamic model of a flexible rotor-sliding bearing system ( FRSBS ) with asqueeze film damper ( SFD) is established. Considered in the model are oil film inertia force,damping farce, clearance excitation force, interference force of different frequencies and staticload, as opposed to previous research. On the basis of this model, the optimal design of the systemis deeply studied. Simulation shows that the system optimization design can effectively improve thesystem stability. 展开更多
关键词 squeeze film damper(SFD) sliding bearing flexible rotor optimal design
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A VARIABLE PARAMETER SQUEEZE OIL FILM DAMPER
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作者 Wang Huang Taiping(Department of Power Engineering ,NUAA 29 Yudao Street ,Nanjing 210016,P.R.China) 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI 1994年第1期27-31,共5页
The effectiveness of variable parameter squeeze oil film damper (VPSFD) in the steady and transient unbalance response control of flexible rotors is examined.First, a preliminary property design of VPSFD is presente... The effectiveness of variable parameter squeeze oil film damper (VPSFD) in the steady and transient unbalance response control of flexible rotors is examined.First, a preliminary property design of VPSFD is presented on the improved finite length bearing theory.VPSFD is different from the conventional squeeze film damper, and is designed to possess continuous changeable oil film clearance and land length. These parameters can be exactly adjusted on a computer by sending commends to a special control device. Then, a simple rotor system with VPSFD is investigated. The experimental results show that VPSFD can attenuate the rotor system resonance peak due to unbalance. 展开更多
关键词 VIBRATION damperS flexible structures squeeze OIL film lubricated bearings
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Chaotic Response of Cracked Rotor Supported on Squeeze Film Damper and the Routes to Chaos
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作者 贺尔铭 任兴民 秦卫阳 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2002年第3期145-149,共5页
In this paper, the chaotic response of a rotor system with crack supported on the squeeze film damper (SFD) is studied. Baesd on the short bearing approximation and π film assumption, the film force is expressed as a... In this paper, the chaotic response of a rotor system with crack supported on the squeeze film damper (SFD) is studied. Baesd on the short bearing approximation and π film assumption, the film force is expressed as a function of speed and displacement of the bearing in the X and Y directions. The result shows that the film force can suppress the non synchronous response effectively if an SFD is designed well. The increase of the bearing parameter can suppress chaos. When the bearing parameter is s... 展开更多
关键词 squeeze film damper (SFD) cracked rotor chaotic response intermittence
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Occurrence of bistable state in squeeze film damper rotor system
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作者 陈照波 焦映厚 +2 位作者 刘占生 夏松波 蒋书运 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2000年第2期75-77,共3页
Presents the study on the law governing the occurrence of bistable state in the squeeze film damper supported rigid rotor system by theoretical calculations,the way q calculating the bistable state characteristics, th... Presents the study on the law governing the occurrence of bistable state in the squeeze film damper supported rigid rotor system by theoretical calculations,the way q calculating the bistable state characteristics, the analysis of bistable state characteristics using bearing parameter B and mass eccentricity U as basic parameters, and the ranges of B and U values established, and concludes that the occurrence of bistable state can be avoided provided design parameters are properly selected so that the B and U values are not in the ranges established. This makes it convenient to optimize the squeeze film damper design parameters. 展开更多
关键词 squeeze film damper BISTABLE state ROTOR system
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The Effect of Elastic Deformation in a New Style Elastic Squeeze Oil Film Damper on Its Vibration Absorption Characteristics
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作者 阮金彪 刘荣强 +2 位作者 刘树春 闫国军 翟文杰 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 1996年第1期54-57,共4页
Squeeze oil film damper are widely used in small high-speed aeroengine.But they are all made of high-hardness alloy steel. In order to improve their vibration absorption performance a new style of soft metal plated da... Squeeze oil film damper are widely used in small high-speed aeroengine.But they are all made of high-hardness alloy steel. In order to improve their vibration absorption performance a new style of soft metal plated damper has been studied. A coat of soft metal is plated on inner surface of the oil film ring, the surface will be deformed to some extent under the effect of oil film pressure. The characteristics of such dampers are calculated and analysed. Result shows that, compared with common damper, the new style damper can change oil film pressure distribution, enhance oil film damping, decrease stiffness, and reduce the force transfered to casing. 展开更多
关键词 ss:squeeze OIL film damper ELASTIC DEFORMATION ABSORPTION of vibration soft metal
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Experimental study on integral axial squeeze film damper to suppress longitudinal vibration of propulsion shafting
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作者 Fan Wenqiang He Lidong +3 位作者 Jia Xingyun Yan Wei Zhu Gang Wang Jian 《High Technology Letters》 EI CAS 2021年第1期76-85,共10页
This paper aims at investigating the effectiveness of squeeze oil film in suppressing the longitudinal vibration of propulsion shaft systems through a novel integral axial squeeze film damper(IASFD).After designing th... This paper aims at investigating the effectiveness of squeeze oil film in suppressing the longitudinal vibration of propulsion shaft systems through a novel integral axial squeeze film damper(IASFD).After designing the IASFD,a propulsion shafting test rig for the longitudinal vibration control is built.Longitudinal vibration control experiments of the propulsion shafting are carried out under different magnitude and frequency of the excitation force.The results show that both IASFD elastic support and IASFD elastic damping support have excellent vibration attenuation characteristics,and can effectively suppress the longitudinal vibration of the shaft system in a wide frequency range.However,IASFD elastic damping support has a more significant vibration reduction effect than the other supports,and increasing the damping of the system has obvious effect on reducing the shafting vibration.For an excitation force of 45 N,the maximum reduction of the vibration amplitude is 89.16%.Also,the vibration generated by the resonance phenomenon is also significantly reduced. 展开更多
关键词 integral axial squeeze film damper(IASFD) propulsion shafting longitudinal vibration vibration damping
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SOLUTION FOR PRESSURE DISTRIBUTION IN SQUEEZE FILM DAMPER WITH ELECTROHYDRAULIC ACTIVE CONTROL
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作者 Li Yunhua Wang Zhanlin Beijing University of Aeronautics and Astronautics Chen Jieli Taiwan Cheng Kung University 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 1999年第1期28-32,共5页
Aiming at the problems existed in the squeeze film damper of the rotating machinery utilizing traditional passive dynamic pressure film bearing, a project of dynamic pressure and static pressure hybrid oil film bearin... Aiming at the problems existed in the squeeze film damper of the rotating machinery utilizing traditional passive dynamic pressure film bearing, a project of dynamic pressure and static pressure hybrid oil film bearing with piezoelectric crystal electrohydraulic active control supply orifice hole is proposed. For this kind of hybrid film bearing, the π film assumption can not hold true. In order to solve the pressure distribution, a new kind of solving method is proposed. 展开更多
关键词 Hydraulic control squeeze film damper Rotor dynamics
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弹性环式挤压油膜阻尼器一体化圆柱滚子轴承保持架振动特性分析
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作者 王树涵 杨海生 +3 位作者 唐瑞 罗斌 杨小民 邓四二 《振动与冲击》 EI CSCD 北大核心 2024年第5期302-314,共13页
航空发动机主轴中滚动轴承为了降低系统振动经常与弹性环式挤压油膜阻尼器(elastic ring squeeze film damper, ERSFD)联合使用。基于滚动轴承动力学理论和流体力学控制方程,采用变步长积分算法建立圆柱滚子轴承与ERSFD耦合的动力学分... 航空发动机主轴中滚动轴承为了降低系统振动经常与弹性环式挤压油膜阻尼器(elastic ring squeeze film damper, ERSFD)联合使用。基于滚动轴承动力学理论和流体力学控制方程,采用变步长积分算法建立圆柱滚子轴承与ERSFD耦合的动力学分析模型,对外圈带ERSFD的圆柱滚子轴承保持架振动特性和打滑率进行研究。研究结果表明:与未装配ERSFD的圆柱滚子轴承相比,ERSFD可以提高圆柱滚子轴承保持架的稳定性。过大或过小的弹性环凸台数量与宽度都不利于圆柱滚子轴承保持架的稳定性,需要选择合适的凸台数量和宽度。径向载荷与转速对带弹性环的圆柱滚子轴承保持架稳定性影响显著,保持架涡动频率的谐波次数随着径向载荷的增加而减少,其对应的幅值也减小;保持架涡动频率的谐波次数随着转速的增加而增加,其对应幅值也增加。 展开更多
关键词 圆柱滚子轴承 弹性环式挤压油膜阻尼器(ERSFD) 轴承动力学 保持架振动特性 保持架打滑率
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弹性环挤压油膜阻尼器支撑下的柔性转子系统动力学分析
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作者 赵先锋 杨洋 +3 位作者 王子尧 路宽 曾劲 杨翊仁 《动力学与控制学报》 2024年第1期43-51,共9页
弹性环挤压油膜阻尼器(Elastic ring squeeze film damper, ERSFD)具有良好的支撑作用和减振效果,但由于其结构和流场耦合行为极为复杂,使得已有的物理模型难以完整表现出ERSFD的力学特性.为了进一步探究ERSFD的力学机理,本文借助有限... 弹性环挤压油膜阻尼器(Elastic ring squeeze film damper, ERSFD)具有良好的支撑作用和减振效果,但由于其结构和流场耦合行为极为复杂,使得已有的物理模型难以完整表现出ERSFD的力学特性.为了进一步探究ERSFD的力学机理,本文借助有限元仿真平台,采用双向流固耦合的计算方法,剖析弹性环与油膜之间的相互作用,获取ERSFD中油膜压力的分布规律.在此基础上,利用最小二乘法进一步拟合出ERSFD等效刚度、等效阻尼与转子轴颈扰动位移的映射关系,并将其分别引入柔性转子系统动力学模型中.通过数值计算研究了ERSFD支撑下柔性转子系统的振动响应,分别给出了不同转速下转子系统的响应分岔图、轴心轨迹等.同时,通过对比分析,进一步揭示了ERSFD所诱发出的转子系统丰富的非线性动力学行为,有助于对ERSFD轴承支撑特性的理解. 展开更多
关键词 弹性环挤压油膜阻尼器 转子系统 双向流固耦合 动力学特性
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非稳态工况下外圈带有ERSFD的圆柱滚子轴承保持架动态特性
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作者 王树涵 杨海生 +2 位作者 晏军 高利霞 邓四二 《轴承》 北大核心 2024年第1期62-70,共9页
为降低航空发动机主轴传动系统的振动,通常将弹性环、挤压油膜阻尼器与圆柱滚子轴承联合使用。基于滚动轴承动力学理论和流体力学控制方程,建立了外圈带有弹性环式挤压油膜阻尼器(ERSFD)的圆柱滚子轴承动力学分析模型,采用GSTIFF预估-... 为降低航空发动机主轴传动系统的振动,通常将弹性环、挤压油膜阻尼器与圆柱滚子轴承联合使用。基于滚动轴承动力学理论和流体力学控制方程,建立了外圈带有弹性环式挤压油膜阻尼器(ERSFD)的圆柱滚子轴承动力学分析模型,采用GSTIFF预估-校正变步长积分法对动力学微分方程组进行求解,分析转速、冲击载荷以及弹性环结构参数(凸台宽度、凸台数量)对外圈带有ERSFD的圆柱滚子轴承保持架动态特性的影响,结果表明:外圈带有ERSFD的圆柱滚子轴承保持架稳定性高于普通圆柱滚子轴承;转速和冲击载荷对保持架动态特性影响较大,保持架打滑率随着转速的增大而增大,随着轴承所受冲击载荷的增大而减小;过大或过小的弹性环凸台数量与宽度都不利于圆柱滚子轴承保持架的稳定性,需要选择合适的凸台数量和宽度。 展开更多
关键词 滚动轴承 圆柱滚子轴承 航空发动机 挤压油膜阻尼器 转速 冲击载荷 保持架 动态特性
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考虑弹性环变形的挤压油膜阻尼器-转子系统动力响应仿真方法
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作者 向凤光 陈曦 +2 位作者 洪亮 任光明 甘晓华 《推进技术》 EI CAS CSCD 北大核心 2024年第10期200-212,共13页
为了研究弹性环式挤压油膜阻尼器(ERSFD)对转子-支承系统动力特性的影响,基于阻尼器的流固耦合交互作用,提出了考虑弹性环变形的转子系统动力学响应仿真方法。针对流固耦合特性仿真,固体域采用有限元法计算弹性环变形,流体域采用有限差... 为了研究弹性环式挤压油膜阻尼器(ERSFD)对转子-支承系统动力特性的影响,基于阻尼器的流固耦合交互作用,提出了考虑弹性环变形的转子系统动力学响应仿真方法。针对流固耦合特性仿真,固体域采用有限元法计算弹性环变形,流体域采用有限差分法计算油膜压力分布。将阻尼器的动力学系数引入转子系统,采用扫频法求解系统运动方程,最终得到转子系统的稳态动力响应。研究结构参数对ERSFD阻尼系数的影响发现,油膜阻尼与偏心率、轴向长度正相关,而与凸台高度、凸台个数负相关;凸台宽度在4~12 mm内存在最优值,使得油膜阻尼最大。基于参数影响规律改进阻尼器结构,并应用到转子系统后开展仿真分析。结果表明:ERSFD能够提供较大的油膜阻尼,通过降低支承外传力使得盘处的振幅减小。改进后的ERSFD阻尼更大,盘处一阶减振幅度从28%显著提升至41%。 展开更多
关键词 航空发动机 转子系统 弹性环式挤压油膜阻尼器 流固耦合 动力学响应
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Bifurcation and chaos of the bladed overhang rotor system with squeeze film dampers 被引量:5
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作者 CAO DengQing WANG LiGang +1 位作者 CHEN YuShu HUANG WenHu 《Science China(Technological Sciences)》 SCIE EI CAS 2009年第3期709-720,共12页
To study the nonlinear dynamic behavior of the bladed overhang rotor system with squeeze film damper (SFD), a blade-overhang rotor-SFD model is formulated using the lumped mass method and the Lagrange approach. The ca... To study the nonlinear dynamic behavior of the bladed overhang rotor system with squeeze film damper (SFD), a blade-overhang rotor-SFD model is formulated using the lumped mass method and the Lagrange approach. The cavitated short bearing model is employed to describe the nonlinear oil force of the SFD. To reduce the scale of the nonlinear coupling system, a set of orthogonal transformations is employed to decouple the one nodal diameter equations of blades, which are coupled with the dy- namical equations of the rotor, with other equations of blades. In this way, the original system with 16+4n (n≥3) degrees of freedom (DoF) is reduced to a system with 24 DoF only. Then the parametric excitation terms in the blade-overhang rotor-SFD model are simplified in terms of periodic transforma- tions. The coupling equations are numerically solved and the solutions are used to analyze the dy- namic behavior of the system in terms of the bifurcation diagram, whirl orbit, Poincaré map and spec- trum plot. A variety of motion types are found such as multi-periodic, quasi-periodic, and chaotic mo- tions. Moreover, the typical nonlinear dynamic evolutions including the periodic-doubling bifurcation and reverse bifurcation are noted. It is noticed that there exist apparent differences in the dynamic behavior between the blade-overhang rotor-SFD models without and with considering the effect of blades. 展开更多
关键词 bladed OVERHANG rotor system squeeze film damper BIFURCATION chaos
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