Presents the design scheme developed for design of software for Integrated Passive and Active Vibration Control(IPAVC) and the coding of a prototyne system, and the selection of the famous finite element program MSC/N...Presents the design scheme developed for design of software for Integrated Passive and Active Vibration Control(IPAVC) and the coding of a prototyne system, and the selection of the famous finite element program MSC/NASTRAN as an important module of software to deal with large and complicated structures and systems with an example to demonstrate the prototype system.展开更多
First, discusses some conventional modal correlation evaluation methods. And then, introduces the concepts of global modes and local modes to solve difficulties in analyzing large and complex structures with dense mod...First, discusses some conventional modal correlation evaluation methods. And then, introduces the concepts of global modes and local modes to solve difficulties in analyzing large and complex structures with dense modes like the equipment cabin, establishes a criterion with the ratio of modal strain energy to conveniently distinguish these modes. Finally, investigates the methods of modal vector reduction, error localization and model updating used to achieve a high correlation between the tested and calculated modes of the cabin, and verifies the finite element model of the equipment cabin as a foundation for further design and analysis.展开更多
Presents the general formula derived with a smart beam structure bonded with piezoelectric material using the piezoelectricity theory, elastic mechanism and Hamilton principle for electromechanically coupled piezoelec...Presents the general formula derived with a smart beam structure bonded with piezoelectric material using the piezoelectricity theory, elastic mechanism and Hamilton principle for electromechanically coupled piezoelectric finite element and dynamic equations, the second order dynamic model built, and the expression of state space, and the analysis of conventional speed and position feedback and the design of optimum feedback controller for output, the finite element models built for a piezoelectric cantilever beam, and the feedback controller designed eventually, and concludes with simulation results that the vibration suppression obtained is very satisfactory and the algorithms proposed are very useful.展开更多
文摘Presents the design scheme developed for design of software for Integrated Passive and Active Vibration Control(IPAVC) and the coding of a prototyne system, and the selection of the famous finite element program MSC/NASTRAN as an important module of software to deal with large and complicated structures and systems with an example to demonstrate the prototype system.
文摘First, discusses some conventional modal correlation evaluation methods. And then, introduces the concepts of global modes and local modes to solve difficulties in analyzing large and complex structures with dense modes like the equipment cabin, establishes a criterion with the ratio of modal strain energy to conveniently distinguish these modes. Finally, investigates the methods of modal vector reduction, error localization and model updating used to achieve a high correlation between the tested and calculated modes of the cabin, and verifies the finite element model of the equipment cabin as a foundation for further design and analysis.
文摘Presents the general formula derived with a smart beam structure bonded with piezoelectric material using the piezoelectricity theory, elastic mechanism and Hamilton principle for electromechanically coupled piezoelectric finite element and dynamic equations, the second order dynamic model built, and the expression of state space, and the analysis of conventional speed and position feedback and the design of optimum feedback controller for output, the finite element models built for a piezoelectric cantilever beam, and the feedback controller designed eventually, and concludes with simulation results that the vibration suppression obtained is very satisfactory and the algorithms proposed are very useful.
