Abstract— The nature of active magnetic bearings has many advantages over the conventional bearing, as its operation is energy efficient and potentially leads to cleaner and noise-free environment. However, the successful operation of an active magnetic bearing system requires a complex real-time control system, because of its unstable characteristics, as well as its nature of being a multi-inp...

The magnetic-liquid double suspension bearing (MLDSB) is a new type of bearing, with electromagnetic as the main part and hydrostatic supports auxiliary part. It can greatly improve capacity stiffness rotor-bearing systems suitable for medium speed, heavy load, frequent starting occasions. Compared active system, traditional protective device replaced by system in MLDSB, impact-rubbing phenomen...

The effects of endurance training on PGE (2) levels and upon the maximal activity of hepatic carnitine palmitoyltransferase (CPT) system were studied in rats bearing the Walker 256 carciosarcoma. Animals were randomly assigned to a sedentary control (SC), sedentary tumor-bearing (ST), exercised control (EC), and as an exercised tumor-bearing (ET) group. Trained rats ran on a treadmill (60% VO (...

Active magnetic bearings are increasingly being utilized in rotating machinery applications as an alternative to the conventional rolling-element and fluid-film bearing types. In this paper three control schemes for a large air-gap magnetic bearing system are described. In the large air-gap situation, the magnetic bearing system operates in highly nonlinear regimes .The non-linearity in this sy...

The optimum design of a flexible rotor supported on three-lobe bearings, overhung centrifugal compressor, is studied for the optimal unbalance response using the genetic algorithm (GA) and method of feasible directions (MFD). The MFD is used to verify the GA results. The feasibility, effectivness, and avaliability of the GA is certainly of value because it allows the exploration of many differe...

A CASE-BASED REASONING SYSTEM FOR BEARING DESIGN Xiaoli Qin Advisor: Dr. William C. Regli Using Case-Based Reasoning (CBR) techniques in engineering design provides a promising methodology for solving design problems in this complex domain. CBR is based on the idea that past problem-solving experiences can be reused and learned from in solving new problems. We have developed a CBR design system...

This work deals with the application of an active unbalance compensation scheme for a rotor-bearing system by simultaneously using two control strategies, consisting in the synthesis of a dynamic stiffness controller and the acceleration scheduling for the rotor speed. The rotor-bearing system consists of an asymmetrical Jeffcott-like rotor system with a servomechanism to position a sliding bea...

Introduction Long-term success of total knee arthroplasty (TKA) is a multifactorial issue. Implant design and materials selection play an important role in the wear-related performance of TKA. It is widely recognized that excessive wear of UHMWPE tibial inserts can result in mechanical implant instability and, in some instances, catastrophic wear. However, the more harmful effect occurs with ti...

A Multivariable Control System is designed for an Electromagnetic Bearing and Rotating Shaft System. The Linear Quadratic Gaussian with Loop Transfer Recovery (LQG/LTR) methodology is used to design a robust Model Based Compensator (MBC). The electromagnetic bearing consists of an electromagnetic actuator, operated in magnetic "attractive" force mode, with permanent magnet biased coils. The per...