...Jiang Kejian; Zhu Changsheng; Tang Ming The undesired synchronous vibration due to rotor mass imbalance is a main disturbance source in all rotating machinery including active magnetic bearing (AMB)-rotor systems. In the AMB-rotor system, imbalance compensation, which causes the AMB actuators...

...Ahmad Darabi; Alireza Alfi; Bahare Kiumarsi; Hamidreza Modares Winding inductances of an exciter machine of brushless generator normally consist of nonsinusoidal terms versus rotor position angle, so evaluations of the inductances necessitate detailed modeling and complicated parameter...

... amplitude ratios among various spectral lines with localized surface defects. Combined parametric effects have been analyzed and their influence has been considered with design of experiments and surface response methodology is used to predict the dynamic response of a rotor bearing system...

...M. Necip Sahinkaya; Abdul-Hadi G. Abulrub; Clifford R. Burrows This paper considers two issues in the vibration of rotating machines, namely, control of rotor vibration and control of the forces transmitted to the base. An adaptive multi-objective method is developed to tackle these issues...

... is an accurate representation of the system. Unfortunately, the Cramer–Rao bound is only valid for LTI systems and is not valid for linear time periodic (LTP) systems such as a helicopter rotor in forward flight. This paper describes an extension of the Cramer–Rao bound to LTP systems and demonstrates...

...A. K. Samantaray; S. S. Dasgupta; R. Bhattacharyya The rotating internal damping or nonconservative circulatory force in a rotor shaft system causes instability beyond a certain threshold rotor spinning speed. However, if the source loading of the drive is considered, then the rotor spin...

... control signals. The estimation errors are considered as bounded disturbances to the seal system and are taken into account by the robust adaptive controllers. Simulation results show that the controllers effectively stabilize the stator motion and control the stator tilts to synchronously track the rotor...

...Angelo Bonfitto; Xavier De Lépine; Mario Silvagni; Andrea Tonoli The aim of this paper is to investigate the potential of a self-sensing strategy in the case of an electromagnetic damper for the vibration control of flexible structures and rotors. The study has been performed in the case...

...Kari Tammi Resonance vibrations (critical speeds) play a significant role in rotor vibration control. Active vibration control methods for rotors are studied to develop solutions to enhance machines’ dynamic behavior, durability, and operating range. This paper reports rotor vibration attenuation...

...Hans A. DeSmidt; K. W. Wang; Edward C. Smith Active magnetic bearings (AMBs) have been proposed by many researchers and engineers as an alternative to replace traditional contact bearings in rotor and driveshaft systems. Such active, noncontact bearings do not have frictional wear and can be used...

... and Drives , Dublin . 16 10 2006 27 11 2007 12 05 2008 damping eddy currents electromagnetic forces electromagnets flexible structures magnetic circuits magnetic flux rotors structural engineering turbomachinery vibration control eddy current dampers...

...Rainer Leuschke; Brian C. Fabien This paper presents a technique for attenuating the external disturbances acting on the rotor of a prototype flywheel energy storage device. The approach uses a three-phase axial flux brushless dc motor to simultaneously produce a torque and a radial force...

.... Simulated were various cases, including the response of an ideal motor, which functions perfectly to designer’s specifications, and motors with shorted stator coils, a bad phase capacitor, and broken rotor bars. By constructing an analogy between the motor and a communication channel, Shannon’s theorems...

...Tong Zhou; Zhengce Sun; Jianxue Xu; Weihua Han The dynamic behavior of a cracked rotor has been theoretically analyzed by many researchers. In this paper, an experimental confirmation of the theoretical results is sought, especially for the nonlinear dynamic behavior of the cracked rotor. The crack...

...Shiyu Zhou; Stephen W. Dyer; Kwang-keun Shin; Jianjun Shi; Jun Ni Imbalance-induced vibration of rotating machineries is an important factor limiting the performance and fatigue life of a rotor system. Particularly, the severe resonant vibration of a rotor when it passes through its critical speeds...

...Kwang-Keun Shin, Senior Research Engineer; Jun Ni, Professor, The problem of active balancing of speed-varying rotors, whose dynamics are changing or hard to be known beforehand, is frequently encountered in many applications. This paper presents a new adaptive method for balancing speed-varying...

... , “ Balancing of Rotating Systems During Operation ,” J. Sound Vib. , 57 , No. 2 , pp. 225 – 235 . Pardivala, D., Dyer, S. W., and Bailey, C. D., 1998, “Design Modifications and Active Balancing On An Integrally Forged Steam Turbine Rotor To Solve Serious Reliability Problems,” Proceedings of the 27 th...

... include the stator coils, the squirrel cage rotor bars, and the magnetic flux routing section. The final bond graph spans electrical, magnetic, and mechanical energy domains, and contains common motor faults. From this bond graph. state equations were extracted and simulations performed. Simulated were...

...Shiyu Zhou; Jianjun Shi Rigid rotor dynamic model is widely used to model rotating machinery. In this paper, a speed-varying transient rigid rotor model is developed in the state space form. The states of this model are augmented to include imbalance forces and moments. A time-varying observer can...

... pulsation in the absence of gravity. The proposed control scheme is applied to the thrust bearing of a magnetically levitated rotor. Simulations and experiments indicate that the control system is capable of maintaining stability and consistent performance. 3 Bond graph models of the bearing...