CN101908432B - Rapid stable liquid switch based on filtration vibration design - Google Patents

Abstract

The invention discloses a rapid stable liquid switch based on a filtration vibration design, comprising a glass upper cover and a base which form a closed structure, wherein the inner surface of the glass upper cover is a concave spherical surface, and the inner surface of the base is equidistantly provided with four contact points which are used as electrodes; the contact points are connected with screw plugs on the outer surface of the base; and an inner space of the liquid switch is filled with conductive liquid and liquid medium, and the liquid medium is incompatible with the conductive liquid. The rapid stable liquid switch based on the filtration vibration design can allocate the liquid medium according to different measurement requirements, and can filtrate surrounding environment vibration by taking account of the design method of filtration vibration; and the rapid stable liquid switch can achieve the effect of rapidly filtrating surrounding vibration by changing air bubbles into the liquid medium required by dynamic characteristics of a system calculated according to different vibration sources.

Description

Based on filter shake the design rapid stable liquid switch

Technical field

The invention belongs to the inertial technology field, be specifically related to a kind of fluid level switch, the rapid stable liquid switch that particularly shakes and design based on filter.

Background technology

Open-air missile unit requires in the short time that arrives intended target, just to find Horizon, makes that attitude gyro can fast and stable.Attitude gyro provides the device at aircraft pitch angle and inclination angle, and its gyro angular momentum is asked to point at any time local ground vertical line direction.But; The gyro angular momentum only possesses azimuth stabilization, does not possess orientation selectivity, therefore; Usually adopt the responsive gyro angular momentum of liquid switch whether perpendicular to local level; In general, when aircraft did not have horizontal acceleration and gyro angular momentum perpendicular to horizontal plane, the electric current that in four electrodes of liquid switch, flows through equated; And when aircraft does not have horizontal acceleration and gyro angular momentum and is not orthogonal to horizontal plane; The electric current that flows through in four electrodes of liquid switch is unequal; The electric current of these electrodes is correctly drawn; And input to different correction motors, and can make and revise motor generation moment, it is vertical with local level until this angular momentum to order about the angular momentum precession.At transmitter site, there are a lot of small vibration meetings to seek Horizon and bring interference to attitude gyro.These microvibrations comprise various complicated factors, near the for example vibration of generator, the vibration of crustal movement, vibration when people or garage advance or the like.

Existing liquid switch structure is shown in Fig. 1 a, and by the closed structure that a glass loam cake 1 and pedestal 2 are formed, glass loam cake 1 inner surface is a concave spherical surface.Four contact points 3 as electrode are arranged on the inner surface of pedestal 2 equidistantly, and shown in Fig. 1 b, the material of contact point 3 is the platinum bar, and contact point 3 is connected with the plug screw 4 of pedestal 2 outer surfaces.Be filled with conducting liquid 5 in the inner space of said liquid switch and stay a bubble 6.When liquid switch was horizontal, the amount that bubble 6 hides four electrodes equated that two electrodes that are in relative position are linked to be bridge circuit through a pair of build-out resistor.Alternating voltage is added between the common point of base electrode and two pairs of build-out resistors, and this just forms two AC resistance electric bridges, and its output voltage is corresponding to the motion of bubble 6 around two orthogonal horizontal axis.If liquid switch is vertical axis cant angle theta angle around ground; Because the invariant position of bubble 6 relative gravities, then the covering amount of 6 pairs of a certain electrodes of bubble reduces, like Fig. 1 b; The amount of opposite electrode increases and hide altogether; At this moment bridge circuit is just uneven, at the liquid switch tiltangle hour, and the linear functional relation of the output voltage of circuit and the inclination angle of liquid switch.When aircraft did not have horizontal acceleration and gyro angular momentum perpendicular to horizontal plane, the electric current that in four electrodes of liquid switch, flows through equated; And when aircraft does not have horizontal acceleration and gyro angular momentum and is not orthogonal to horizontal plane; The electric current that flows through in four electrodes of liquid switch is unequal; The electric current of these electrodes is correctly drawn through plug screw 4; And input to different correction motors, and can make and revise motor generation moment, it is vertical with local level until this angular momentum to order about the angular momentum precession.

The shortcoming of existing liquid switch is not have the special on-the-spot vibration problem of considering, not to filtering vibrate consideration, not obvious to the filtration result of ambient environment vibrations.

Summary of the invention

The present invention provides a kind of rapid stable liquid switch, through replacing the bubble in the liquid switch with other certain liquid mediums, thereby changes damping, reaches the influence that does not as far as possible respond small vibration, reaches based on the shake effect of the fast and stable that designs of filter.

Rapid stable liquid switch provided by the invention improves liquid switch of the prior art and obtains; Partly change the bubble of liquid switch in the prior art into liquid medium; Utilize certain area of conducting liquid and contact point to contact galvanic circle of formation; The size of the contact area of conducting liquid and contact point depends on the angular displacement of the whole off-vertical axis of liquid switch, i.e. tiltangle.Liquid switch among the present invention is provided with an opening that injects liquid on glass loam cake 1, after liquid injected liquid switch inside, opening passed through bolt seals.Described liquid medium 7 is incompatible with conducting liquid, and the density of liquid medium 7 is less than the density of conducting liquid, and the metal at butt contact place does not have corrosivity.

The invention has the advantages that:

(1) disposes electrolytical composition ratio according to different measurement requirement, need to change and dispose electrolytical composition ratio, increase consideration, ambient vibration is on every side carried out filtering the method for designing of filtering vibration.

The liquid medium of needs when (2) changing bubble into calculate according to the vibration source difference system dynamic characteristic reaches the effect of quick filtering ambient vibration.

Description of drawings

Fig. 1 a is the structural representation of liquid switch of the prior art;

Fig. 1 b is the profile of liquid switch of the prior art;

Fig. 2 is the structural representation of liquid switch of the present invention;

Fig. 3 is the principle schematic of liquid switch of the present invention

Fig. 4 is the body axis system sketch map;

Fig. 5 is the coordinate sketch map of liquid switch provided by the invention;

Fig. 6 is the acceleration 0～2000Hz of a system scanning oscillating curve;

System device output when Fig. 7 is the scanning vibration;

Fig. 8 is system and vibration table acceleration 0～2000Hz scanning oscillating curve.

Embodiment

Below in conjunction with accompanying drawing and embodiment rapid stable liquid switch provided by the invention is elaborated.

Rapid stable liquid switch provided by the invention improves liquid switch of the prior art and obtains; As shown in Figure 2; Partly change the bubble of liquid switch in the prior art into liquid medium 7; Utilize certain area of conducting liquid 5 and contact point 3 to contact galvanic circle of formation, the size of the contact area of conducting liquid 5 and contact point 3 depends on the angular displacement of the whole off-vertical axis of liquid switch, i.e. tiltangle.Liquid switch among the present invention is provided with an opening 8 that injects liquid on glass loam cake 1, after liquid injected liquid switch inside, opening 8 passed through bolt seals.Described liquid medium 7 is incompatible with conducting liquid 5, and the density of liquid medium 7 is less than the density of conducting liquid 5, and the metal at butt contact 3 places does not have corrosivity.The volume of said liquid medium and conducting solution volume ratio satisfy following condition: under 25 ℃ of temperature conditions, during the liquid switch horizontal positioned, resistance value is 269-369 ohm; ± 15 jiaos of timesharing of liquid switch inclination, maximum resistance should be not less than 2500 ohm; ± 30 jiaos of timesharing of liquid switch inclination, maximum resistance should be not less than 2500 ohm, and minimum resistance should be not more than 180 ohm.If conducting solution is elected lithium chloride as, liquid medium is elected silicone oil as, and liquid switch is that the vibration of 0～2000Hz has the good filter effect of shaking to vibration frequency like this.

Liquid switch was a comparatively flat container originally, in conducting liquid is arranged.Having under the situation of horizontal acceleration, not only there is laminar flow conducting liquid inside, also turbulent flow will be arranged, and for the fast and stable characteristics of convenient explanation liquid switch of the present invention, supposes that liquid switch is a spheroid, and as shown in Figure 3, the spheroid radius is r.There are liquid medium 7 and conducting liquid 5 in liquid switch inside, and the area I among Fig. 3 is a liquid medium 7, and area I I and III are conducting liquid 5, and wherein the volume of area I II is the same big with the volume of area I, and relative centre of sphere O point with area I is symmetrical.If have way to change the conducting liquid among the area I II 5 in the area I liquid medium 7 and still remain on the position of area I II; Then the quality of liquid medium in the spheroid 7 and conducting liquid 5 is with respect to container center O point symmetry; No matter therefore the liquid switch thataway has acceleration, the conducting liquid 5 in the liquid switch can not receive any moment.But in fact the conducting liquid 5 of area I II is than liquid medium 7 weights of area I, and the of poor quality of the two is Δ m, then Δ m=m _III-m _I, wherein, m _IIIBe 5 quality of the conducting liquid among the area I II, m _IFor in the area I liquid medium 7 quality, the distance of the barycenter of area I II and spheroid center O is d.

The setting coordinate system is following:

Geographic coordinate system: X _gY _gZ _g(east, north, day); The horizontal system of coordinates: X _hY _hZ _h, course angle ψ is like Fig. 4; Attitude gyro does not have phantom ring, and the outer shroud coordinate system is: X _aY _aZ _aAttitude gyro does not have phantom ring, and interior cyclic co-ordinate is to be: X _bY _bZ _b, the liquid level coordinate system of liquid switch: X ₁Y ₁Z ₁Body axis system is consistent with gyro housing coordinate system to be: X _cY _cZ _c(Fig. 5); If the pitching angle theta of aircraft=0, inclination angle δ=0, then X _cY _cZ _cWith X _hY _hZ _hAlso consistent, geographic latitude L, flying speed V, ψ are course angle (Fig. 4), R _eBe earth radius, ω _eBe rotational-angular velocity of the earth.Relation between above-mentioned several coordinate system is following:

Suppose the X of aircraft along body axis system or gyro housing coordinate system _cAxle has acceleration The inertia force F that Δ m of poor quality receives is arranged between conducting liquid and the spheroid under the condition of damping _IWith gravity F _G,

F _G=Δ mg.As shown in Figure 3, liquid medium 7 and the liquid level coordinate system X of conducting liquid 5 in the liquid switch around liquid switch ₁Y ₁Z ₁In the moment of inertia of X1, Y1 axle identical, represent that with I the damping coefficient between liquid medium and the conducting liquid representes that with D the direction of principal axis for Y1 is then arranged:

$I(\stackrel{\·\·}{{\mathrm{\θ}}_y}+\stackrel{\·\·}{{\mathrm{\σ}}_y})=-D\stackrel{\·\·}{{\mathrm{\σ}}_y}+d\·\cos ({\mathrm{\θ}}_y+{\mathrm{\σ}}_y)\mathrm{\Δ}{\mathrm{mf}}_x^c-d\·\mathrm{\Δmg}\·\sin ({\mathrm{\θ}}_y+{\mathrm{\σ}}_y)---\left(1\right)$

Work as θ _y, σ _yDuring for low-angle (less than 1 degree), have

$I(\stackrel{\·\·}{{\mathrm{\θ}}_y}+\stackrel{\·\·}{{\mathrm{\σ}}_y})=-D\stackrel{\·\·}{{\mathrm{\σ}}_y}+d\·\mathrm{\Δ}{\mathrm{mf}}_x^c-d\·\mathrm{\Δmg}\·({\mathrm{\θ}}_y+{\mathrm{\σ}}_y)---\left(2\right)$

For the X1 direction of principal axis, kinetics equation is:

$I(\stackrel{\·\·}{{\mathrm{\θ}}_x}+\stackrel{\·\·}{{\mathrm{\σ}}_x})=-D\stackrel{\·\·}{{\mathrm{\σ}}_x}+d\·\mathrm{\Δ}{\mathrm{mf}}_y^c-d\·\mathrm{\Δmg}\·({\mathrm{\θ}}_x+{\mathrm{\σ}}_x)---\left(3\right)$

Can obtain liquid switch according to above-mentioned formula (1), (3) is a second-order system, and draws the amplitude-versus-frequency curve of liquid switch in view of the above.Compare with the liquid switch that has bubble of the prior art; After bubble was replaced with certain liquid medium, the D value increased, and can filter out most of vibration interference so improve the second-order system of back liquid switch; Especially at high band (greater than 200Hz), almost completely filter.

Embodiment

Be the proving test that carries out below, explain that the gyroscope that the liquid switch after the improvement is housed can effectively avoid high-frequency vibration interference, thereby reach the effect of fast and stable.

Attach: vibration experiment vibration control and test macro

Gyrostatic frock to be tested is housed is fixed on the horizontal revolving stage of vibrating device, the output of lifting the device that shakes on the vibration frock is as the manipulated signal of vibration machine, and the vibration parameters when describing vibration with other fixed point vibrations is controlled by vibration gauge.Through the derivation of liquid switch kinetics equation, 167 type liquid switches after improving are placed on the vibration machine make an experiment, that select and design parameter liquid medium in the checking liquid switch.Described design parameter comprises the density of selected liquid medium etc.

The vibration test content

The vibration frequency of shaking platform is transferred to interfering frequency, and the gyroscope of the liquid switch after the gyroscope dress of primary liquid switch will being housed respectively and improvement being housed fits on the shaking platform.

The liquid switch test:

Experimental temperature: 25 ℃ of table 1 167 liquid switch original records (units: ohm)

Table 2 167 liquid switch specification requirements

	Output valve
		Switch level is placed	25 ℃ of 269-369 ohms
± 15 jiaos of branches of switch inclination	Maximum resistance should be not less than 2500 ohm
		± 30 jiaos of branches of switch inclination	Maximum resistance should be not less than 2500 ohm, and minimum resistance should be not more than 180 ohm

Liquid switch after improving is placed on the shaking platform makes an experiment, the test data in the test instruction card 1 satisfies in the table 2 for the specification requirement of liquid switch, has verified the design parameter of liquid switch.Proved existing feasibility, found the method for further raising liquid switch precision with method.

After liquid switch satisfies above specification requirement; Carry out further vibration test, respectively liquid switch provided by the invention is installed on the different testing equipments, on shaking platform, carry out vibration test; Vibration test result such as Fig. 6-Fig. 8; Among every width of cloth figure first row figure is the system vibration curve, and abscissa is the frequency of vibration machine, and ordinate is the acceleration of vibration table; The second row figure is the amplitude-versus-frequency curve of liquid switch; The third line figure is that abscissa is the frequency of vibration machine through the system vibration curve behind the liquid switch, and ordinate is the acceleration of vibration table.Above oscillating curve shows, the gyroscope that the liquid switch after the improvement provided by the invention is housed can effectively be avoided high-frequency vibration interference, thereby the gyroscope fast and stable is got off.

More than be the test effect of explaining after certain liquid medium configuration of usefulness within the scope of the present invention, the liquid switch after the improvement satisfies the specification requirement of 167 liquid switches.Obviously, example limit of the present invention anything but, because; Can also produce the shake composition ratio of scope of many other different filters according to guidelines of the present invention and method; Need in proper range, change,, when accomplishing the preparation of media fluid, certain precautionary measures will be arranged in order to obtain best result; Must be pure or belong to application layer, must guarantee when handling material to prevent to pollute and make moist.

Claims (3)

1. the rapid stable liquid switch that shakes and design based on filter; It is characterized in that: described liquid switch is formed closed structure by a glass loam cake and pedestal; Interior surface on glass is a concave spherical surface, and four contact points as electrode are arranged on the inner surface of pedestal equidistantly, and contact point is connected with the plug screw of pedestal outer surface; Be filled with conducting liquid and liquid medium in the inner space of said liquid switch; Described liquid medium and conducting liquid are incompatible, and the density of liquid medium is less than the density of conducting liquid, and the metal at butt contact place does not have corrosivity.

2. the rapid stable liquid switch that shakes and design based on filter according to claim 1; It is characterized in that: conducting liquid contacts with contact point and forms the galvanic circle; The size of the contact area of conducting liquid and contact point depends on the angular displacement of the whole off-vertical axis of liquid switch, i.e. tiltangle.

3. the rapid stable liquid switch that shakes and design based on filter according to claim 1 is characterized in that: liquid switch is provided with an opening that injects liquid on glass covering.

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