Active vibration control for a free piston stirling engine with linear alternator FPSE/LA
type: CreativeWork
description: New regulations introduced by the European Network of Transmission System Operators for Electricity (ENTSO) have brought further requirements for grid connected generators into action in 2013. The β-type Stirling engine (FPSE/LA) used for micro combined heat and power systems (MCHP) is a synchronous machine that is designed and tuned to operate at 50Hz ± 0.5Hz. This type of technology has to comply with the new regulations that imposes a wider operating envelop (47Hz-53Hz). This engine suffers from continuous self-induced vibrations caused by the reciprocating motion of a permanent magnet attached to its piston inside a linear alternator. Currently, the damping of the vibrations in the FPSA/LA is achieved by employing a passive tuned mass damper (TMD) tuned to damp vibrations at 50Hz. While passive devices provide a simple and a reliable way to tackle many vibration problems, there exists distinct performance limitations associated with the use of only passive devices. As for this particular application, the main limitation of the TMD in its passive form is its narrow bandwidth of operation that cannot cope with the new bandwidth. Consequently, this could expose the engine to physical damage and failure. Therefore modifications to the existing TMD have to be introduced. This research involved the design and development of an active tuned mass damper (ATMD) and the suitable control strategies using an electromagnetic actuator, namely a linear voice coil motor (VCM). Starting with a validated vibration model of the engine based on two degrees of freedom system (2-DOF), two control techniques, Feedforward/Zero-Placement control with relative/absolute position and Linear Quadratic (LQ) optimal control, were investigated with numerical simulation in the frequency and time domains. For the purpose of testing and implementation, a test rig featuring an electromagnetic shaker, a VCM, and a TMD besides an embedded system was assembled. An electromechanical model of the test …
abstract: New regulations introduced by the European Network of Transmission System Operators for Electricity (ENTSO) have brought further requirements for grid connected generators into action in 2013. The β-type Stirling engine (FPSE/LA) used for micro combined heat and power systems (MCHP) is a synchronous machine that is designed and tuned to operate at 50Hz ± 0.5Hz. This type of technology has to comply with the new regulations that imposes a wider operating envelop (47Hz-53Hz). This engine suffers from continuous self-induced vibrations caused by the reciprocating motion of a permanent magnet attached to its piston inside a linear alternator. Currently, the damping of the vibrations in the FPSA/LA is achieved by employing a passive tuned mass damper (TMD) tuned to damp vibrations at 50Hz. While passive devices provide a simple and a reliable way to tackle many vibration problems, there exists distinct performance limitations associated with the use of only passive devices. As for this particular application, the main limitation of the TMD in its passive form is its narrow bandwidth of operation that cannot cope with the new bandwidth. Consequently, this could expose the engine to physical damage and failure. Therefore modifications to the existing TMD have to be introduced. This research involved the design and development of an active tuned mass damper (ATMD) and the suitable control strategies using an electromagnetic actuator, namely a linear voice coil motor (VCM). Starting with a validated vibration model of the engine based on two degrees of freedom system (2-DOF), two control techniques, Feedforward/Zero-Placement control with relative/absolute position and Linear Quadratic (LQ) optimal control, were investigated with numerical simulation in the frequency and time domains. For the purpose of testing and implementation, a test rig featuring an electromagnetic shaker, a VCM, and a TMD besides an embedded system was assembled. An electromechanical model of the test …
author: Hassan, Ali
language: eng
date published: 2016-7
date modified: 2026-07-24T03:26:46Z
provider: University of Northampton
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: University of Northampton