Construction method of quasi-independent modal sensor
A construction method and sensor technology, applied in the field of active control of structural vibration, can solve problems such as complex cutting conditions, piezoelectric sensors and actuators deviating from independent modal control conditions, and limiting far-reaching potential
Inactive Publication Date: 2010-08-11
BEIHANG UNIV
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Problems solved by technology
[0010] (2) For non-uniform beam structures such as those with variable cross-sections, those with sudden changes in stiffness, those with concentrated mass, etc., the clipping conditions will become very complicated or even have no feasible solution
[0014] First, if the structural characteristics, especially the natural mode shapes, change during operation, the tailored piezoelectric sensors and actuators will deviate from the independent mode control conditions, which may invalidate the entire control
In addition, "hardened" independent modal sensors and actuators also largely limit the far-reaching potential of intelligent sensing and actuators combined with modern adaptive control techniques
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[0260] See figure 1 Cut out the independent mode control, that is, the single mode schematic diagram, for the piezoelectric film, figure 2 is a schematic diagram of independent mode control, image 3 A schematic diagram of a piezoelectric sensor, Figure 4 Cut out the independent mode control or multi-mode schematic diagram for the piezoelectric film, Figure 5 is an ideal independent modal damping control schematic diagram, the above-mentioned simple and easy modal sensor in the figure is very attractive, but it can only be used as a design or a guiding principle for real-time control--to find a fully satisfying condition (4- 8) Ω s (size and location) is usually not possible. To this end, a strategy to approach the ideal modal sensor by "softening" combination and optimization of multiple finite-size piezoelectric sheet sensors is proposed here.
[0261] See Figure 6 , taking the plate structure as an example:
[0262] A kind of construction method of quasi-independ...
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The invention discloses a construction method of a quasi-independent modal sensor, which comprises three steps: 1. pasting m piezoelectric strain rate sensors on a plate, summating the sensors through various grain gsi (grand scale integration) to form a combined piezoelectric strain rate sensor and subsequently exciting a combined piezoelectric actuator formed by n grain gaj; and 2. when the strain rate sensors satisfy the formula I as shown in the accompanying drawing, selecting areas omega si of m piezoelectric sensor pieces and corresponding gsi so that the formula II shown in the accompanying drawing can be satisfied; and 3. establishing an objective function as the accompanying drawing, and realizing the goal through regulating the grain of proportional amplifiers connected behind each piezoelectric sensor. The invention has practical value and wide application prospect in the field of active control in structural vibration.
Description
(1) Technical field [0001] The invention relates to a construction method of a piezoelectric sensor, in particular to a construction method of a quasi-independent mode sensor based on a quasi-independent mode control method, and belongs to the field of active control of structural vibration. (2) Background technology [0002] For the vibration control of a continuous structure with multiple degrees of freedom, especially ∞ degrees of freedom, the "overflow" problem is a headache and a roadblock, and has become a topic of concern in many literatures. Among them, in theory, the most attractive solution is the "independent mode control" technology. It is based on the structural vibration modal theory. First, the structural sensor response is transformed into the modal coordinate domain, in which the controller is designed and the modal generalized force is optimized for each single-degree-of-freedom system. The device drive structure completes the closed-loop control without o...
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Inventor 姚军李晓钢
Owner BEIHANG UNIV