FEEDFORWARD ADAPTIVE CONTROL OF FLEXURAL VIBRATION IN A BEAM USING WAVE AMPLITUDES

✍ Scribed by C.R. HALKYARD; B.R. MACE

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 449 KB
• Volume: 254
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.2001.4089

✦ Synopsis

This paper concerns the real-time estimation of wave amplitudes and their subsequent use as a cost function in adaptive active control of bending vibrations in a beam. The amplitude of the wave propagating downstream from the control location is estimated by "ltering the outputs of an array of sensors. Minimizing this wave amplitude has signi"cant advantages over the more conventional approach in which velocity at some point is minimized. Expressions for the ideal frequency responses of the wave "lters are found for the case of an array comprising two sensors in the far "eld. These "lters are non-causal. FIR implementations designed using direct and time-delay methods are described, the latter o!ering some substantial advantages. Practical performance considerations are discussed, including "lter length, frequency range, e!ects of near "elds, group delays, accuracy and cross-sensitivity. Simulations and experimental measurements are performed and compared.