JPH10227717A - Support device for horizontal vibrating table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the overconstraint among hydrostatic bearings to each other, in a support device of a horizontal vibrating table which supports each overturning moment in the pitching and rolling directions, of the horizontal vibrating table, by plural hydrostatic bearings. SOLUTION: This support device comprises the hydrostatic bearings P1 , P2 for supporting the overturning moment in a pitching direction, besides of the hydrostatic bearings R1 -R4 , between a horizontal vibrating table and a base, and the feedback systems of the hydrostatic bearings are connected with each other, so that the feedback amount corresponding to the correlation of the pistons, is to be added. Thereby the overturning moment of the horizontal vibrating table can be supported without generating the overconstraint among the hydrostatic bearings R1 -R4 , P1 and P2 .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supporting device for a horizontal shaking table, and more particularly to a supporting device for a horizontal shaking table capable of supporting a tilting moment in the pitching and rolling directions during horizontal vibration.

[0002]

2. Description of the Related Art In a test system in which a large test object (artificial satellite) is mounted on a large horizontal shaking table and vibrates in a horizontal direction, such as a horizontal vibration test system for an artificial satellite, for example, If the center of gravity is high, a very large overturning moment occurs. To support this, conventionally, as shown in FIGS. 3 and 4, four hydrostatic bearings (the hydrostatic bearings will be described in detail later) as shown in FIG.
Installed between 010.

[0003] That is, each of the hydrostatic bearings having the same capacity (the reference numerals R _{1 to} R ₄ are assigned in accordance with the positions of the hydrostatic bearings having the above-described configuration, and hereinafter referred to as hydrostatic bearings R _{1 to} R ₄ ). Are arranged below the horizontal shaking table 05 in a square shape. The rolling in the direction of arrow 02 is supported by the hydrostatic bearings R ₃ and R ₄ , and the pitching in the direction of arrow 03 is performed by the hydrostatic bearings R ₁ and R ₁ . and it is adapted to support at R ₄ (for the opposite direction of rolling and pitching, a hydrostatic bearing R _1, R ₂ and R _2, R ₃ are each supported). Arrow 01 indicates the horizontal vibration axis (the vibration direction).
In addition, reference numeral 06 in FIG. 3 indicates a specimen, and arrow 07 indicates a falling direction. Here, the hydrostatic bearing will be described with reference to FIG.

[0004] This hydrostatic bearing has a movable body 6 having an internal recess 62.
And an upper pad 7 fitted into the inner recess 62, and one end of the upper pad 7
A preload bolt 8 extending downward from 62 through a piston 20 (described in detail below), a lower pad 9 and an internal recess
Land protruding from bottom surface 62a of 62 and lower surface of upper pad 7
A first pocket 10 formed by the pressure oil supply source 11 is provided in the pocket 10 and a pressure oil passage 71 having a throttle 72 is provided in the pocket 10. ing.

Similarly, a second pocket 92 is also provided on the lower surface of the piston 20, and an oil passage 94 and a throttle 94a are provided for supplying pressure oil from the hydraulic pressure supply source 11 to the pocket 92.

The piston 20 is formed of a member different from the other parts of the movable body 6, and is formed inside the opening 65 by a pair of projections 64 projecting from the opening 65 formed in the movable body 6. Is vertically movably guided, and a flange portion 20a is protruded from the outer peripheral edge to form oil chambers 66a, 66b between the upper and lower surfaces of the flange portion 20a and the projections 64, 64.

A pair of pressure oil supply passages 67a, 67b communicating with the oil chambers 66a, 66b are connected to the electrohydraulic servo valve 21. Reference numeral 22 denotes a displacement detector for detecting a relative displacement amount of the piston 20 with respect to the movable body 6. Also sign
Reference numeral 24 denotes a hydraulic unit for supplying hydraulic oil to the oil chambers 66a and 66b via the servo valve 21. The servo valve 21 receives a signal from the displacement detector 22 via a comparator 27 and a servo amplifier 29. It is configured to be transmitted. Reference numeral 26 denotes a potentiometer as input means for a position setting signal of the piston 20, and reference numeral 28 denotes a servo amplifier.

[0008] With the above configuration, the movable body 6 is provided with the oil chamber 66a,
The piston 20 moves in the vertical direction in accordance with the pressure difference between the pressure oil supplied to each of the pistons 66b and 66b. As a result, the relative position of the piston 20 is adjusted, whereby the distance between the support surface 61 and the mounting surface 2 is adjusted. Here, the supply pressure oil to the oil chambers 66a and 66b is controlled by operating the potentiometer 26 and the servo valve 21.
Is controlled by controlling

Further, the rigid damping performance of the hydrostatic bearing can be adjusted by controlling the supply pressure oil, and the natural frequency and the response level can also be adjusted. Since the position of the piston 20 is controlled by the servo valve 21 and the signal of the displacement detector 22 for detecting the position of the piston 20 is added as a feedback signal,
Disturbance vibration from a fixed portion such as the base pad 9 causes the movable body 6
Is fed back to the control of (1), and a vibration isolation effect against disturbance vibration can be provided.

That is, the feedback control system including the displacement detector 22, the comparator 27, and the servo valve 21 provides the support surface 61
The position (relative position with respect to the mounting surface 2) is maintained at a predetermined target value against disturbances such as vibrations of the mounting surface 2 and the like. At the same time, the horizontal vibration table is mounted on the support surface 61.

[0011]

By the way, in the case of the horizontal vibration test, if the center of gravity of the test specimen is high, the pitching moment for falling in the direction of the excitation axis is very large, and the specimen may fall in the direction perpendicular to the excitation axis. Of the rolling moment
About 3 times (for example, rolling moment 40ton f
M, pitching moment 100tonfm).

In the above-described horizontal shaking table supporting apparatus in which four equal-capacity hydrostatic bearings are arranged in a square shape, the rolling moment supporting capacity (supporting capacity) and the pitching moment supporting capacity (supporting capacity). ) And each moment is supported by two pairs of hydrostatic bearings. Therefore, the capacity of each hydrostatic bearing is selected based on the rolling moment (40 ton · f · m in the above example). Then, the pitching moment (100 tonf in the above example)
M) is insufficient to support 60 ton fm (30 ton fm for a pair of hydrostatic bearings).

If the hydrostatic bearings are simply added to compensate for this shortage, there is a problem that the hydrostatic bearings are over-constrained to each other and the horizontal shaking table is distorted. The present invention is intended to solve such a problem.

[0014]

According to the present invention, there is provided a movable body having a mounting surface to a horizontal shaking table, a piston disposed in an internal recess of the movable body in a floating state, and an outer surface of the piston. A pair of pressure oil supply passages for supplying pressure oil to the inner surface and the outer surface of the piston, respectively, and a pair of pressure oil supply passages for supplying the pressure oil to the inner surface and the outer surface of the piston. A servo valve capable of adjusting the position of the piston with respect to the base pad by adjusting the pressure of pressure oil, a displacement detector for detecting a relative displacement between the piston and the movable body, and a signal of the displacement detector And a feedback control system for controlling the servo valve to maintain the position of the piston at a predetermined position, and a potentiometer as an input means for a position setting signal of the piston. A plurality of hydrostatic bearings composed of a plurality of hydrostatic bearings are installed between the horizontal shaking table and the base, and each of the hydrostatic bearings is adjusted so that a feedback amount commensurate with the correlation of each piston of the hydrostatic bearings is added. A feedback control circuit that interconnects the feedback systems of the pressure bearings is provided as a means for solving the problem.

Further, the plurality of hydrostatic bearings support four overturning moments in the pitching and rolling directions provided at each corner of a square centered on the geometric center point of the horizontal shaking table. A first hydrostatic bearing, and two second hydrostatic bearings symmetrically mounted on a horizontal vibration axis of the horizontal shaking table with respect to a geometric center point of the horizontal shaking table. And

Further, the bearing interval P between the two second hydrostatic bearings is set to be larger than the bearing interval R between the two first hydrostatic bearings in the horizontal vibration axis direction. I have.

Further, each bearing capacity of the two second hydrostatic bearings is set to be larger than each bearing capacity of the first hydrostatic bearing as a means for solving the problem.

In the horizontal vibration table support device of the present invention described above, a plurality of hydrostatic bearings each having a feedback system that operates to maintain its own piston position at a predetermined position are provided between the horizontal vibration table and the base. In addition to the installation, the feedback systems of each hydrostatic bearing were connected to each other so that a feedback amount commensurate with the correlation of each piston was added. Each moment in the pitching and rolling directions can be supported.

In addition, four first hydrostatic bearings are installed at each corner of a square centered on the geometric center point of the horizontal shaking table, and the geometrical shape of the horizontal shaking table is set on the horizontal vibration axis. Since the two second hydrostatic bearings for supporting the pitching moment are installed at symmetric positions with respect to the center point, it is possible to use the second static pressure bearing exclusively for supporting the pitching moment and not to perform the rolling moment support.

Further, four first hydrostatic bearings are installed at each corner of a square centered on the geometric center point of the horizontal shaking table, and the geometrical shape of the horizontal shaking table is set on the horizontal vibration axis. Two second hydrostatic bearings for supporting a pitching moment are installed at symmetrical positions with respect to the center point, and two first hydrostatic bearings are arranged in the horizontal vibration direction with a bearing interval P between the two second hydrostatic bearings.
By setting it larger than the bearing interval R of the hydrostatic bearing, for example, 1.5 times, a large supporting force against pitching moment by the second hydrostatic bearing can be obtained.

Further, since each bearing capacity of the second hydrostatic bearing is twice as large as each bearing capacity of the first hydrostatic bearing, the second static pressure bearing can be formed without increasing the distance between the bearings of the second hydrostatic bearing. A large bearing capacity against pitching moment by the bearing is obtained.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic plan view of a horizontal shaking table supporting device according to an embodiment of the present invention, and FIG. 2 is a feedback control circuit diagram thereof.

In this embodiment, as shown in FIG. 1, in order to compensate for the shortage of the pitching moment supporting ability in the conventional horizontal shaking table shown in FIGS. Center point 05A of horizontal shaking table 05 on the axis of vibration
From the pitching center line 05P (support point distance) P
/ 2, where 1.5 times the fulcrum distance R / 2 in the hydrostatic bearing R ₁ to R _4, has twice the bearing capacity of the first hydrostatic bearing R ₁ to R _4, symmetrically arranged with each other The two second hydrostatic bearings P ₁ , P ₂
When the four first hydrostatic bearings R _{1 to} R ₄ and the two second hydrostatic bearings P ₁ and P ₂ cooperate to carry a pitching moment, the load capacity of the pitching moment Capacity) and a feedback circuit is provided so that the hydrostatic bearings do not compete with each other.

[0024] That is, as shown in FIG. 1, in this embodiment, in addition to the hydrostatic bearing R ₁ to R ₄ of the supporting device shown in FIG. 4, on the horizontal pressure generating shafts 01, the hydrostatic bearing R ₁ ~ Two hydrostatic bearings P ₁ and P ₂ having a bearing capacity twice as large as the bearing capacity of R ₄ are provided with a pitching center line 05P passing through the center point 05A of the horizontal shaking table 05 and orthogonal to the horizontal vibration axis 01. It is installed in a symmetrical position with respect to.

The four first static pressure bearings R _{1 to} R ₄ are installed at the respective corners of a square centered on the geometric center point 05 A of the horizontal shaking table 05. The distance between the bearings R ₁ and R ₂ (and R ₃ and R ₄ ) in the horizontal vibration axis direction (hereinafter referred to as “bearing distance”. 1/2 of the bearing distance is the lever length). , and the distance (hereinafter referred to as "bearing spacing") P between the hydrostatic bearing P ₁ and P _2, a relation of P = 1.5R.

As described above, by setting the lever length of the second hydrostatic bearings P ₁ and P ₂ to be 1.5 times the lever length of the first hydrostatic bearings R _{1 to} R ₄ , the second hydrostatic bearing P ₁ , P ₂ is set to 1.5 times the lever length of the first hydrostatic bearings R _{1 to} R _4. The burden force (capacity of hydrostatic bearing × lever length) of the pressure bearings P ₁ and P ₂ can be set large.

In the above configuration, the second hydrostatic bearings P ₁ ,
Since P ₂ is disposed on the horizontal vibration shaft 01, the second hydrostatic bearings P ₁ and P ₂ do not act to restrict the rolling of the horizontal vibration table 2. Therefore, there is no possibility that the second static pressure bearing P _1, P ₂ and the first hydrostatic bearing R ₁ to R ₄ are competing.

Further, by setting each bearing capacity of the second hydrostatic bearings P ₁ and P _{2 to twice that} of each of the first hydrostatic bearings R _{1 to} R ₄ , the distance between the bearings of the second hydrostatic bearing is reduced. A large supporting force against pitching moment by the second hydrostatic bearing can be obtained without increasing the interval.

The rolling of the horizontal shaking table 05 is performed in the first
The horizontal bearings R ₁ and R ₂ or the first horizontal bearings R ₃ and R ₄ are supported as a set.

Therefore, the position (piston position) of each of the first hydrostatic bearings R _{1 to} R ₄ is adjusted by R ₁ , R ₂ and R _{1
If 3} and R ₄ are handled together, there will be no competition between the four first hydrostatic bearings.

On the other hand, regarding the pitching, the first hydrostatic bearings R ₁ , R ₄ and the second hydrostatic bearing P ₁ (or the hydrostatic bearings R ₂ , R ₃ , P ₂ ) are supported as one set. Will work.

[0032] Thus, for example, by operating the second hydrostatic bearing P ₁ of the potentiometer 26, when the second hydrostatic bearing P ₁ piston raised upward by 1 mm, a hydrostatic bearing R ₁ first by a result, R ₄ is 1mm each (R / P)
If R / P is not increased by (R / P is the bearing interval ratio), it will be over-constrained.

For this purpose, the feedback control systems of the first hydrostatic bearings R ₁ and R ₄ are designed so that a feedback amount commensurate with the displacement of the second hydrostatic bearing P ₁ is added, as shown in FIG. An amount (a × R / P) obtained by apportioning the displacement amount (a) of the second hydrostatic bearing P _{1 to} the inter-bearing spacing ratio is input to each feedback control system of the first hydrostatic bearings R ₁ and R _4. the feedback control circuit is provided which is connected to the second feedback control system of the hydrostatic bearing P ₁ and the respective feedback control system of the first hydrostatic bearing R _1, R _4. Reference numeral 30 indicates a gain adjuster for subtracting the gain from R / P.

[0034] Accordingly, the second static pressure bearing P ₁ for leveling the second hydrostatic bearing P _2, when the second static pressure bearing P ₁ and is moved to 1mm upwards, first hydrostatic bearing R ₁ , R ₄
Also moves upward by a predetermined amount (1 mm × R / P), and it is possible to prevent the horizontal shaking table 2 from being distorted (over-constrained).

A similar feedback control circuit is provided for the static pressure bearing P ₂ and the static pressure bearings R ₂ and R ₃ .

As described above, in this embodiment, a plurality of hydrostatic bearings are installed between the horizontal shaking table 05 and the base 010 in order to support each overturning moment in the pitching and rolling directions during horizontal vibration. In the support device, the potential (height) of each hydrostatic bearing can be adjusted while maintaining each hydrostatic bearing so as not to be excessively restricted.

Needless to say, each static pressure bearing can suppress its own displacement with respect to disturbance by the feedback system of each static pressure bearing. The capacity (bearing capacity) of the hydrostatic bearing is determined by the flange portion protruding from the outer peripheral edge of the piston 20.
It is determined by the product of the area of 20a and the pressure of the hydraulic pressure supplied to the oil chambers 66a and 66b.

[0038]

As described above, according to the horizontal shaking table support apparatus of the present invention, the following effects and advantages can be obtained. (1) Install a plurality of hydrostatic bearings with a feedback system that operates to maintain their own piston position at a predetermined position between the horizontal shaking table and the base, and over-constrain each hydrostatic bearing to each other. It is possible to support each moment in the pitching and rolling directions of the horizontal vibrating table while keeping the horizontal vibration table from becoming inconsistent. (2) Four first hydrostatic bearings are installed at each corner of a square centered on the geometric center of the horizontal shaking table, and the geometric center of the horizontal shaking table is set on the horizontal vibration axis. Since the two second hydrostatic bearings for supporting the pitching moment are installed at symmetrical positions with respect to the above, it is possible to adopt a configuration in which the second static pressure bearing is dedicated to the pitching moment support and does not perform the rolling moment support. (3) Four first hydrostatic bearings are installed at each corner of the square centered on the geometric center point of the horizontal shaking table, and the geometric center point of the horizontal shaking table is set on the horizontal vibration axis. , Two second hydrostatic bearings for supporting the pitching moment are installed at symmetrical positions with respect to each other, and the two first hydrostatic bearings installed in the horizontal vibration direction with the bearing interval P between the two second hydrostatic bearings By setting the distance between the bearings to be larger than the bearing interval R, a large bearing force against pitching moment by the second hydrostatic bearing can be obtained. (4) Since each bearing capacity of the second hydrostatic bearing is twice as large as each bearing capacity of the first hydrostatic bearing, the second hydrostatic bearing can be used without increasing the distance between the bearings of the second hydrostatic bearing. A large supporting force against pitching moment is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a horizontal vibration table support device according to an embodiment of the present invention.

FIG. 2 is a diagram of the feedback control circuit.

FIG. 3 is a schematic side view of a conventional horizontal shaking table support device.

FIG. 4 is a schematic plan view of the same.

FIG. 5 is a longitudinal sectional view of a hydrostatic bearing.

[Explanation of symbols]

01 Horizontal excitation axis 02 Rolling direction 03 Pitching direction 04 Bearing 05 Horizontal shaking table 05A Geometric center point of horizontal shaking table 05P Pitching center axis of horizontal shaking table 06 Specimen 010 Base (floating foundation) 2 Mounting surface 6 Moving body 7 pAD 8 preload bolt 9 base pad 20 piston 21 electro-hydraulic servo valve 22 displacement detector 24 hydraulic unit 26 the potentiometer 27 comparator 30 gain adjuster 61 supporting surface (mounting surface) 67a, 67b pressure oil supply passage R _1, R ₂ , R ₃ , R ₄ First hydrostatic bearing P ₁ , P ₂ Second hydrostatic bearing

Claims (4)

[Claims] 1. A plurality of hydrostatic bearings are installed between a horizontal shaking table and a base to support the horizontal shaking table, and each of the hydrostatic bearings has a mounting surface on the horizontal shaking table. A movable body having: a piston disposed in a floating manner in an internal recess of the movable body; and a base pad disposed opposite to an outer surface of the piston and having a mounting surface with respect to the base. A pair of pressure oil supply passages for supplying pressure oil to the inner surface and the outer surface, respectively, and the position of the piston with respect to the base pad can be adjusted by adjusting the pressure of the pressure oil supplied to the respective pressure oil supply passages Servo valve, a displacement detector for detecting a relative displacement between the piston and the movable body, and a signal from the displacement detector is input and the servo valve is controlled to position the piston at a predetermined position. To hold And a potentiometer as input means for the piston position setting signal. The static pressures are adjusted so that a feedback amount corresponding to the correlation between the pistons of the plurality of hydrostatic bearings is added. A horizontal vibration table support device, comprising: a feedback control circuit that interconnects the feedback control systems of the bearings. 2. The plurality of hydrostatic bearings support four overturning moments in the pitching and rolling directions provided at each corner of a square centered on the geometric center point of the horizontal shaking table. A first hydrostatic bearing, and two second hydrostatic bearings symmetrically arranged on the horizontal vibration axis of the horizontal shaking table with respect to the geometric center point of the horizontal shaking table. The horizontal vibration table support device according to claim 1, wherein: 3. A bearing interval P between the two second hydrostatic bearings.
The horizontal vibrating table support device according to claim 2, wherein a distance between the first and second hydrostatic bearings in the horizontal vibration axis direction is set to be larger than a bearing interval R of the first hydrostatic bearing. 4. The bearing capacity of each of the two second hydrostatic bearings is set to be larger than the bearing capacity of each of the first hydrostatic bearings.
The support device for a horizontal vibration table according to any one of the above.