Structural intensity in beams—waves, transducer systems and the conditioning problem

Halkyard, C.R.; Mace, B.R.

doi:10.1006/jsvi.1995.0380

Cited by 24 publications

(17 citation statements)

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“…A typical example of this is the measurement of flexural wave amplitude between two closely spaced discontinuities. Under these circumstances, an array comprising of a strain gauge and an accelerometer at each of two locations can offer substantially better conditioning than an array of four uniformly spaced accelerometers [1].…”

Section: Errors and Conditioningmentioning

confidence: 99%

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Sensor Array Design for Wave Decomposition in the Presence of Coupled Motion

Halkyard¹

2003

Journal of Sound and Vibration

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Section: Errors and Conditioningmentioning

confidence: 99%

“…The design of appropriate sensor arrays for these situations has been investigated in previous work [1] and is summarized in section 4.…”

Section: Introductionmentioning

confidence: 99%

Sensor Array Design for Wave Decomposition in the Presence of Coupled Motion

Halkyard¹

2003

Journal of Sound and Vibration

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“…(1)- (4) ．これに対し，近年，波動解析を基調とした波動制御法に関する研究が注目を集めている (5)- (17) ．当該手法は，振動モードの生成メカニズムに踏み込み，振動モードの構成要素である波動を除去することで，振動モードの不活性化や無振動状態の生成といったユニークな制御効果を得ることができる．これまでに提案された波動制御法を総括すると，Vaughan が終端インピーダンス制御を提唱したのに始まり (5) ，von Flotow らが慣性力型制振器を片持ちはりの先端に設置し，波動制御系の実現を試みている (6) ．また，Tanaka らは有限はりに半無限はりの特性を与えることを主眼としたアクティブ・シンク法を提案し，当該手法の有用性を理論と実験の両面から立証している (19) ，その後，制御用センサとして著者ら (9)- (11) および Halkyard ら (12) が，柔軟はりや薄肉矩形平板を対象とする波動フィルタリング法を提案し，その有用性を実証している．一方，スマートセンサを基調とした手法としては，著者らが，波動伝播を計測するスマートセンサのシェーピング関数が複素指数関数によって表現されることを見出し，単一周波数のみを対象とした手法を提案している (14), (15) ．また，その発展型として，ある一定のバンド幅に対応できるフェイズシフタを導入することで，帯域制限されたランダムノイズにも対応可能な波動制御系を構築し，その有用性を実証している (16), (17) ．スマートセンサを基調とした手法 (14)- (17) の問題点は，シェーピング関数が周波数に依存することである．したがって，当該手法においては，理論的に 100%の精度で波動計測が行えるのはあらかじめ設定した単一周波数のみ …”

Section: フィードフォワード・フィードバックを問わず，これまでに多くの能動振動制御法が提案されてきたが，その主流は振動モードの重unclassified

Active Feedforward Wave Control of a Rectangular Panel Using a Wave Filter Constructed with Smart Mode Sensors

Iwamoto

Tanaka²,

Takara³

2011

Trans.JSME(C)

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This paper is concerned with an active wave control method of a rectangular panel. It is the purpose of this paper to present a wave filtering method for the panel using smart modal sensors and its application to an adaptive feedforward control system. Firstly, a wave solution of a rectangular panel is derived to describe the wave dynamics of the structure. This is followed by the proposition of the design procedure of the wave filter using smart mode sensors. Then, from a viewpoint of numerical analyses, accuracy of the proposed method is verified using condition numbers of a filtering matrix. Furthermore, a multi-rate technique is introduced for approximation of the sub-filters in the wave filter, which reduces the computational burden. Finally, experiment on an adaptive feedforward control system using the proposed method is carried out. It is found that the reflected wave absorbing control enables the inactivation of vibration modes.

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“…Other techniques, such as the cross-spectrum [3] and wave decomposition methods [4], rely on batch processing and are frequency domain techniques. The responses are measured over a period of time and later Fourier-analyzed to give estimates of the total intensity over the measurement period and over a range of frequencies.…”

Section: Introductionmentioning

confidence: 99%

“…The approach is systematic, in that a design procedure is described which allows for the use of any type of sensor, such as accelerometers and strain gauges, and can be applied to the measurement of intensity in any wave-bearing structural component. Hybrid sensor arrays, which utilize two or more types of sensor and which have distinct advantages [4], may be used and the sensors need not be equally spaced. Furthermore, the estimates are relatively insensitive to measurement noise and sensor miscalibration.…”

Section: Introductionmentioning

confidence: 99%