CN103101616A

CN103101616A - Dual-wafer piezoelectric patch type vibration spoiler device

Info

Publication number: CN103101616A
Application number: CN2011103591669A
Authority: CN
Inventors: 冯强; 张洋; 崔晓春; 李玲
Original assignee: AVIC Shenyang Aerodynamics Research Institute
Current assignee: AVIC Shenyang Aerodynamics Research Institute
Priority date: 2011-11-14
Filing date: 2011-11-14
Publication date: 2013-05-15

Abstract

The invention discloses a dual-wafer piezoelectric patch type vibration spoiler device which comprises piezoelectric wafers made of piezoelectric materials and a spoiler vibration beam made of aluminum alloy, wherein the piezoelectric wafers are adhered at two sides of the spoiler vibration beam by epoxy resin, a layer of film electrode is compounded on each of non-adhesive surfaces of outer sides of the piezoelectric wafers, and smooth polyimide rectification layers are coated on the piezoelectric wafer on the outer surface and the spoiler vibration beam. The dual-wafer piezoelectric patch type vibration spoiler device is simple in structure, and is easy to be comprehensively arranged on an actual plane. The dual-wafer piezoelectric patch type vibration spoiler device can simultaneously play roles of inhibiting noise, reducing cabin opening resistance, and improving the separation characteristic of buried weapons. The dual-wafer piezoelectric patch type vibration spoiler device overcomes the problem that the conventional fixing spoiler fails under the condition that Ma is more than 1.

Description

A kind of Dual-wafer piezoelectric sheet type vibration spoiler device

Technical field

The present invention relates to the fluid technique field, particularly relate to a kind of aircraft open that the levels of aerodynamic noise of weapon-bay reduces, the additional resistance of opening the cabin reduces, in bury the Dual-wafer piezoelectric sheet type vibration spoiler device that the weapon separation attitude is controlled.

Background technology

Aircraft will be thrown in flight course/weapon delivery usually.Weapon-bay comprises a pair of hatch door usually, only opens when input/weapon delivery, within all the other flight time, the weapon-bay hatch door is in closed condition, to keep the smooth pneumatic profile of aircraft, improve the aircraft flight performance, as manoevreability, Stealth Fighter, low-resistance performance etc.

In state of flight, after weapon-bay is opened, between the inner low speed flow of weapon-bay and the outside high velocity air of weapon-bay, form the skim fluid, be called free shear layer.Free shear layer is unsettled, and section forms a large amount of whirlpool unity structures within it.The inner whirlpool of shear layer unity structure bumps against with the weapon-bay rear wall after striding across the weapon-bay accent with shear layer, forms high-intensity cavity resonance, thereby at the high-intensity aerodynamics noise of the inner formation of weapon-bay.This high-intensity aerodynamics noise is to aircraft, weapon-bay and firearm construction, and the weapon-bay inner electronic equipment all has destructive effect.Secondly, because weapon-bay is opened the inhibitory action of rear deck body cavity flow and the vortex system structure formation of cavity inside complexity, can stream the generation considerable influence to the aircraft outside, thereby produce the larger additional resistance of opening the cabin, worsen the overall aeroperformance of aircraft.Again, after weapon-bay was opened, flowing in the cabin formed, and makes in the cabin larger contrary pressure gradient to occur along air flow line, and weapon-bay trailing edge pressure is higher than near pressure leading edge.Under this distribution of pressure, in bury weapon and be subject to larger nose-up pitching moment effect, the separation of burying weapon in being unfavorable for.

At present, the exiter of controlling for the weapon-bay noise is fixed type leading edge spoiler (Spoiler).The leading edge spoiler is a kind of flow control apparatus that stretches out weapon-bay, and its surface is higher than the weapon-bay accent, and leading edge arranges that there is its obvious technological deficiency in the flow control method of disturbing flow device:

1, owing to having destroyed the smooth aerodynamic configuration of aircraft, produce additional resistance;

2, spoiler need to stretch out weapon-bay after weapon-bay is opened, and needs complicated drive system, and increases structural weight;

3, work as flight Mach number MɑAfter 1, control effect and sharply descend, even lost efficacy.

Summary of the invention

The technical problem to be solved in the present invention is to provide and a kind of shear layer is applied excitation, reduces aircraft and opens weapon-bay high strength aerodynamics noise, reduces the subsidiary load that opens the cabin, improves the twin lamella piezoelectric type vibrating spoiler device that buries the weapon stalling characteristic in weapon-bay.

The technical scheme that adopts is:

A kind of Dual-wafer piezoelectric sheet type vibration spoiler device comprises the piezoelectric chip of piezoelectric making, the spoiler walking beam that aluminum alloy is made.Described piezoelectric chip is two both sides that are bonded in respectively the spoiler walking beam with epoxide-resin glue, the compound thin film electrode of the piezoelectric chip non-bonding plane in the outside, the piezoelectric chip and the spoiler walking beam that are positioned at outside face are coated with the smooth polyimide rectification layer of one deck, consist of twin lamella piezoelectric type vibrating spoiler.Utilize the inverse piezoelectric effect of piezoelectric, under external voltage, piezoelectric chip produces distortion, produces flexural deformation thereby drive the spoiler beams of metal, forms the most advanced and sophisticated displacement of spoiler.Encourage by alternating voltage, realize the periodic transformation of piezoelectric chip deformation direction, thereby at the most advanced and sophisticated periodic vibration that produces certain frequency (several thousand Hz) of spoiler, flow field to be controlled is produced the high frequency pumping effect.Dual-wafer piezoelectric sheet type vibration spoiler is filled mutually with modular form and model platform, be arranged on the weapon-bay cavity by model platform, reduce unlatching weapon-bay aerodynamics noise and the additional resistance of opening the cabin, improve and bury the weapon stalling characteristic in weapon-bay.

Advantage of the present invention is:

1, the present invention is simple in structure, is easy to comprehensively arrange on true aircraft;

2, the present invention can play simultaneously and suppress noise, reduces the resistance that opens the cabin, buries the control effect of weapon stalling characteristic in improving;

3, being arranged vertically scheme in the present invention has overcome conventional fixed type spoiler and has existed MɑThe problem that lost efficacy in 1 situation;

4, the horizontal arrangement scheme in the present invention does not need complicated mechanical drive system, alleviates structural weight with respect to conventional fixed type spoiler.

Description of drawings

Fig. 1 is structural representation of the present invention.

Fig. 2 is that the present invention controls schematic diagram at weapon-bay cavity at right angle setting spoiler.

Fig. 3 is that the present invention installs spoiler control schematic diagram in weapon-bay cavity level.

The specific embodiment

A kind of Dual-wafer piezoelectric sheet type vibration spoiler device comprises the piezoelectric chip 2 of piezoelectric making, the spoiler walking beam 1 that aluminum alloy is made.described piezoelectric chip 2 is bonded in the both sides of spoiler walking beam 1 with epoxide-resin glue, the piezoelectric chip 2 compound thin film electrodes 4 of the non-bonding plane in the outside, the piezoelectric chip and the spoiler walking beam that are positioned at outside face are coated with the smooth polyimide rectification layer 3 of one deck, consist of Dual-wafer piezoelectric sheet type vibration spoiler, Dual-wafer piezoelectric sheet type vibration spoiler is filled mutually with modular form and model platform, make the polyimide rectification 3 concordant with the model platform upper surface layer by layer, be arranged on weapon-bay cavity 5 by model platform, the after vibration spoiler is installed is can be the at right angle setting (see figure 2), also but level is installed (see figure 3).

The mechanism of action of the present invention:

Shown in Figure 2, for being arranged vertically scheme, when not opening the piezoelectric driving part function, the mechanism of action of the present invention is identical with the conventional fixed type spoiler mechanism of action, raise weapon-bay accent shear layer 7 by spoiler, at first make it after striding across weapon-bay 6, eliminate or weaken with " knock-on effect " of weapon-bay trailing edge, thereby eliminate or weaken the disturbance strength of sound source, thereby suppressing noise; Also make simultaneously the outer high-energy fluid of weapon-bay less enter weapon-bay, thereby effectively reduce the weapon-bay additional resistance.Secondly, spoiler makes near the distribution of pressure of weapon-bay frontier and rear be tending towards evenly after raising shear layer, thereby reduces the vertical adverse pressure gradient along air flow line, in bury nose-up pitching moment suffered in the weapon separation process and reduce even opposite sign, bury the weapon stalling characteristic in effectively improving.When opening the piezoelectric driving part function, the weapon-bay shear layer is applied the periodical high-frequency excitation, improve on the one hand MɑThe action effect of＜1 o'clock overcomes on the other hand conventional fixed type spoiler and exists Mɑ1 problem that lost efficacy.

Shown in Figure 3, for the horizontal arrangement scheme, the mechanism of effect of the present invention is mainly the high frequency period excitation by piezoelectricity chip spoiler, change the inner vortex system structure of shear layer or shear layer strides across the flow regime of cavity, thus play slacken sound source, reduce additional resistance, effect that mild longitudinal pressure buries the weapon stalling characteristic in distributing, improving.

Claims

1. Dual-wafer piezoelectric sheet type vibration spoiler device, comprise the piezoelectric chip (2) of piezoelectric making, the spoiler walking beam (1) that aluminum alloy is made, it is characterized in that described piezoelectric chip (2) is bonded in respectively the both sides of spoiler walking beam (1) with epoxide-resin glue, piezoelectric chip (2) the outside compound thin film electrode of non-bonding plane (4), the piezoelectric chip and the spoiler walking beam (1) that are positioned at outside face are coated with the smooth polyimide rectification layer (3) of one deck.