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首頁> 外文學(xué)位 >Dynamic analysis and active vibration control of axially moving materials by wave propagation method.
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Dynamic analysis and active vibration control of axially moving materials by wave propagation method.

機(jī)譯：通過波傳播方法對軸向運(yùn)動材料進(jìn)行動力分析和主動振動控制。

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摘要

Belt and chain drives are commonly employed to transmit power in machinery and automobile accessories. Despite the many advantages of these drives, vibrations and noise generation associated with the drive motion have limited their use and are usually detrimental to their function, especially in high-speed operations and when lighter and higher quality components are required. For high speed and precision applications, it is thus necessary to introduce control methods to attenuate the vibration of the translating element. Although the focus of the proposed research is on vibration and control of belt and chain drive systems, our research findings may be useful for other industrial applications and may have important implications for the design of other high-speed, axially moving mechanical systems.; In this work, we present an exact solution for the linear, transverse response of an axially moving string with general boundary conditions. The solution is derived in the frequency domain and interpreted in terms of wave propagation functions. The boundary effects are included by the use of boundary reflection functions at the boundaries. The response in the time domain involves only several convolution integrals which can easily be obtained for many physical boundary conditions. The transient response of the translating string with a spring or a dashpot at a boundary is presented.; Active vibration control of an axially moving string using space feedforward and feedback controllers is presented. The space feedforward controller is established by employing the idea of wave cancellation. The proposed control law indicates that vibration in the region near to boundaries can be canceled. With the space feedforward control, the mode shapes of the axially moving string are changed such that the free response tends to zero in the region close to boundaries. An interesting physical interpretation is that the control force acts effectively as a holder (active support) which limits the vibration of the string to the upstream region and eliminates any vibration in the downstream region. Simulation results show that the response of the string to both sinusoidal and random excitations is suppressed by applying the space feedforward control. The feedback controller is introduced to attenuate the response of the string due to undesired disturbances in the downstream.; In order to achieve an effective real time control, the stability of the control law is discussed in this research. A modified control strategy leads to an implementable controller which is stable and robust. Experiments were performed on a laboratory belt/chain drive test stand. The experimental results demonstrate the effectiveness, stability and robustness of the proposed feedforward controller.
機(jī)譯：皮帶和鏈條驅(qū)動器通常用于在機(jī)械和汽車配件中傳輸動力。盡管這些驅(qū)動器具有許多優(yōu)點(diǎn)，但與驅(qū)動器運(yùn)動相關(guān)的振動和噪聲產(chǎn)生卻限制了它們的使用，通常不利于其功能，尤其是在高速操作中以及需要更輕，更高質(zhì)量的組件時。因此對于高速和高精度應(yīng)用，有必要引入控制方法以減弱平移元件的振動。盡管本研究的重點(diǎn)是皮帶和鏈傳動系統(tǒng)的振動和控制，但我們的研究結(jié)果可能對其他工業(yè)應(yīng)用有用，并且可能對其他高速軸向移動的機(jī)械系統(tǒng)的設(shè)計產(chǎn)生重要影響。在這項工作中，我們提出了一個具有一般邊界條件的軸向運(yùn)動弦的線性，橫向響應(yīng)的精確解。該解在頻域中導(dǎo)出，并根據(jù)波傳播函數(shù)進(jìn)行解釋。通過在邊界處使用邊界反射函數(shù)來包括邊界效應(yīng)。時域中的響應(yīng)僅涉及幾個卷積積分，對于許多物理邊界條件，可以很容易地獲得這些卷積積分。給出了在邊界處帶有彈簧或減震器的平移弦的瞬態(tài)響應(yīng)。提出了使用空間前饋和反饋控制器對軸向運(yùn)動弦的主動振動控制?？臻g前饋控制器是采用消波的思想建立的。擬議的控制規(guī)律表明，可以消除邊界附近區(qū)域的振動。利用空間前饋控制，軸向移動的弦的模式形狀被改變，使得在靠近邊界的區(qū)域中自由響應(yīng)趨于零。有趣的物理解釋是，控制力有效地充當(dāng)了保持器（主動支撐），將弦的振動限制到上游區(qū)域，并消除了下游區(qū)域的任何振動。仿真結(jié)果表明，通過應(yīng)用空間前饋控制，可以抑制琴弦對正弦和隨機(jī)激勵的響應(yīng)。引入了反饋控制器，以衰減由于下游不希望有的干擾而引起的琴弦響應(yīng)。為了實現(xiàn)有效的實時控制，研究了控制律的穩(wěn)定性。修改后的控制策略導(dǎo)致穩(wěn)定且魯棒的可實施控制器。實驗是在實驗室皮帶/鏈傳動試驗臺上進(jìn)行的。實驗結(jié)果證明了所提出的前饋控制器的有效性，穩(wěn)定性和魯棒性。

著錄項

  • 作者

    Ying, Shenger.;

  • 作者單位

    Wayne State University.;

  • 授予單位 Wayne State University.;
  • 學(xué)科 Engineering Mechanical.
  • 學(xué)位 Ph.D.
  • 年度 1998
  • 頁碼 150 p.
  • 總頁數(shù) 150
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類 機(jī)械、儀表工業(yè);
  • 關(guān)鍵詞

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