Browsing by Author "YANG, TC"

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A BOUNDARY-ELEMENT-BASED OPTIMIZATION TECHNIQUE FOR DESIGN OF ENCLOSURE ACOUSTICAL TREATMENTS
(1995-07-01)
YANG, TC
;
TSENG, CH
;
LING, SF
;
機械工程學系
;
Department of Mechanical Engineering
CONSTRAINED OPTIMIZATION OF ACTIVE NOISE-CONTROL SYSTEMS IN ENCLOSURES
(1994-06-01)
YANG, TC
;
TSENG, CH
;
LING, SF
;
機械工程學系
;
Department of Mechanical Engineering
An effective software design tool is proposed for solving active noise control problems associated with constraints in which the complex strength and location of the secondary source of an active noise control system in an enclosed space are simultaneously optimized. The boundary element method is adopted to evaluate the sound field in enclosures. Furthermore, the boundary used could be of pressure, velocity, or impedance; in addition, the primary source may be at an arbitrary position. An optimizer based on sequential quadratic programming is selected for its accuracy, efficiency, and reliability. Bounds for design variables and proper constraints on the sound field and secondary source can be specified as required. The powerfulness of the proposed tool is demonstrated by optimizing an active control system for an enclosure. For a rectangular cavity, the optimal location of the secondary source is confirmed by observed simulations as always forming a dipole with the primary source situated at off-resonance excitations and subsequently approaching a mirror image position of the primary source at resonance excitations. The optimal location of the controller is found to change with varied upper bounds of the strength of the secondary source. These findings show a discrepancy from those reported in previous researches based on an unconstrained formulation. Sensitivity analysis at the optimum is also included to provide information of practical concern for implementing optimized active noise control systems.
INTEGRATING AND AUTOMATING ANALYSIS AND OPTIMIZATION
(1993-09-17)
YANG, TC
;
TSENG, CH
;
交大名義發表
;
機械工程學系
;
National Chiao Tung University
The development of an interface coupling program on personal computers for an analysis software system such as ANSYS, SAP, etc. and an optimization software system, MOST, is presented. By controlling and directing the communications the interface coupler integrates the two programs while retaining their versatility and interactive features. The integrated system is used to solve a numerical example of active noise control for a three-dimensional enclosure, in which an energy density level of control points is minimized by adding the sound source to cancel the unwanted noise. The interface coupling program automates with relatively low cost the iterative process for designing an engineering system, remaining flexible in acoustical modelling and efficient in equation solving. Also, the coupling interface is developed in a general-purpose way so that it can be expanded easily to integrate more analysis software packages of different kinds.
OPTIMIZATION OF ACTIVE NOISE CONTROL SYSTEMS IN ENCLOSURES
(1993)
YANG, TC
;
TSENG, CH
;
LING, SF
;
機械工程學系
;
Department of Mechanical Engineering