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Piezoelectric vibration accurate deicing method based on vibration mode control

A piezoelectric vibrating, precise technology used in de-icing devices, transportation and packaging, aircraft parts, etc. to solve problems such as inaccurate de-icing positions, deformation, and unwanted vibrations

Active Publication Date: 2021-04-13
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of inaccurate deicing position and excessive vibration deformation in the uniced position in the existing piezoelectric vibration deicing method, and proposes a piezoelectric vibration control based on mode shape control. Precise Deicing Methods

Method used

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  • Piezoelectric vibration accurate deicing method based on vibration mode control
  • Piezoelectric vibration accurate deicing method based on vibration mode control
  • Piezoelectric vibration accurate deicing method based on vibration mode control

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Experimental program
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specific Embodiment approach 1

[0049] Embodiment 1: A piezoelectric vibration precise deicing method based on mode shape control described in this embodiment, the method includes the following steps:

[0050] Step 1. Assuming that the size and location of the icing are not fixed, the piezoelectric sheets are evenly arranged on the entire board;

[0051] The structure of the wing is similar to a plate shape, and the size and location of the ice formation are not fixed, which means that ice cubes of any size may appear at any position on the wing structure, and the piezoelectric sheets are evenly arranged on the entire plate to meet different ice formation conditions The deicing requirements of the location; the layout scheme of the piezoelectric sheet is as follows figure 1 As shown; when the ice cube is on one side of the plate, the piezoelectric sheet is arranged on the other side of the plate.

[0052] Step 2. According to the size of the ice cube and the actual position of the ice cube, design the best ...

specific Embodiment approach 2

[0056] Specific implementation mode two: the difference between this implementation mode and specific implementation mode one is: the specific process of said step two is:

[0057] When the ice cubes are located at the four corners of the entire board, the expression ζ(x,y) of the optimal mode shape for deicing is:

[0058]

[0059] Among them: a 0 and b 0 are the length and width of the plate respectively, ||·|| is the absolute value, and x and y are the independent variables of the best mode shape for deicing.

specific Embodiment approach 3

[0060] Specific embodiment three: the difference between this embodiment and specific embodiment two is: in the described step three, the fitness function J of the genetic algorithm is:

[0061]

[0062] where: ξ i is the lateral displacement of the structure at the i-th point of the designed best mode shape for deicing, w i is the actual structural lateral displacement of the i-th point of the deicing mode obtained according to the voltage values ​​of each piezoelectric sheet, n d is the total number of points.

[0063] The smaller the J value, the closer the actual vibration mode is to the designed optimal deicing mode.

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Abstract

The invention discloses a piezoelectric vibration accurate deicing method based on vibration mode control, belongs to the technical field of structural dynamics, and solves the problems that an existing piezoelectric vibration deicing method is inaccurate in deicing position, and redundant vibration deformation can be generated at an unfrozen position. Under the condition that the size of ice cubes and the icing position are uncertain, piezoelectric patches are uniformly arranged on the structure, so that deicing vibration modes of various forms can be met; under the condition that the icing position and the ice block size are both determined, the deicing vibration mode for the ice block arrangement mode can be achieved through reasonable arrangement of fewer piezoelectric patches. According to the method, the deicing vibration mode can be designed according to different icing positions and ice block shapes, and accurate deicing is achieved. The method can be applied to accurate deicing of a wing part.

Description

technical field [0001] The invention belongs to the technical field of structural dynamics, and in particular relates to a piezoelectric vibration precise deicing method based on mode shape control. Background technique [0002] After the aircraft encounters supercooled water droplets in the air, it is easy to freeze on the leading edge of the wing, tail, rotor and other parts. Icing will change the lift and drag characteristics of the aircraft, reduce the aerodynamic performance and handling performance of the aircraft, affect the safety and control of the aircraft, and have a great impact on the safe flight of the aircraft. Therefore, the deicing system on the aircraft has become an indispensable part to ensure flight safety. Compared with thermal deicing system and chemical deicing system, the existing piezoelectric vibration deicing method has its unique advantages. But at the same time, there are problems of imprecise deicing position and unnecessary vibration deforma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B64D15/16
CPCB64D15/163
Inventor 魏玖存宋智广孙禹晗李凤明
Owner HARBIN ENG UNIV