JP2588923Y2 - Multi-point excitation type vibration test equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a vibration test apparatus,
In particular, the present invention relates to a multi-point vibration type vibration test apparatus in which a plurality of vibrators are connected to one vibration table to perform a vibration test.

[0002]

2. Description of the Related Art In general, when a large specimen is subjected to a vibration test, a hydraulic vibrator having a large vibrating force is required to vibrate in one direction, for example. Therefore, a multi-point excitation method is adopted.

[0003] The multi-point vibration method is a method in which a plurality of small vibrators are connected to a single vibration table to perform a vibration test. This method is effective when an assembly space is considered.

In the case of the multi-point vibrating system, one vibrating table is supported by a plurality of vibrating machines. The supporting points are four or more, that is, the number of vibrating machines is four or more. Then, the mechanical level of each vibrator does not always coincide with the plane of the vibrating table. As a result, the vibration table becomes over-constrained, and an excessive force is applied to the vibration generator to be used.

In order to solve this problem, conventionally, as shown in FIG. 3, when one vibration table 5 is supported by four vibration machines 1-4, each vibration machine 1-4 A jig (spacer) A is placed between at least one of the vibrators 1-4 (in this case, the vibrator 1) and the vibrating table 5 so that the mechanical levels match. It is interposed. Reference numeral 6 indicates a specimen, and reference numeral 7 indicates a foundation.

[0006]

As described above, conventionally, a spacer is interposed between a vibrator and a vibrating table to correct the imbalance of the mechanical level of each vibrator. However, this requires an accurate (dimensional) measurement of the mechanical level of each exciter, which requires a great deal of time and also prepares many types (multi-dimensional) of spacers. This is disadvantageous in terms of operating costs.

The present invention is intended to solve such a problem. In a vibration test apparatus in which a plurality of vibrators are connected to one vibrating table, a servo valve is used as a vibrator. In addition to using a hydraulic exciter controlled by the above, the mechanical level of multiple exciters can be unified by using the level adjuster built in the control unit of the hydraulic exciter It is an object of the present invention to provide a vibration test device.

[0008]

In order to achieve the above object, a multi-point vibration type vibration test apparatus according to the present invention is a multi-point vibration type vibration test apparatus in which a plurality of hydraulic vibrators are connected to one vibration table. in vibration type vibration testing apparatus, the even the hydraulic shakers one, a control unit of the pressurized vibratory shaft and the pressurized vibration generating shaft to allow supply pressure oil to reciprocatingly vibrate electric-hydraulic servo valve and the servo valve , The control unit
The circuitry for the signal of the driving signal source is provided for transmitting to said servo valve, and adjusting and setting levels regulator is interposed in the circuit mechanical level of the hydraulic vibration exciter, the pressure vibration generating shaft It is configured with a feedback adjuster that can adjust a feedback amount of the displacement amount to the level adjuster,
Mechanical level adjustment of the at least one hydraulic shakers of said plurality of hydraulic vibrators is, Zona to the hydraulic vibrator
The feedback amount of the level adjuster
Fees set for each level adjuster provided in the shaker
The mechanical level error of the hydraulic exciter is set at a value smaller than
Control the level adjuster of the hydraulic shakers such but becomes 0
It is characterized in that the row of dividing by.

[0009]

In the above-described multi-point vibration type vibration test apparatus of the present invention,
The vibration axis of each hydraulic vibrator is connected to one vibration table,
Shallow hydraulic vibrators only feedback amount required to correct the mechanical level (smaller) the set Ru driven all hydraulic shakers at the same time, pressurized hydraulic shakers that require the correction generating shafts There is raised argument PPari to vibration table. Do so
And the excitation axis of the hydraulic exciter that needs correction
There is an error between the target command position and the actual position.
A voltage is applied to the level adjuster so that the error becomes 0,
This allows the mechanical level of the hydraulic shaker to be corrected
Can be the same as the mechanical level of other hydraulic exciters .

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view of a multi-point vibration type vibration test apparatus according to an embodiment of the present invention; FIG. It is a schematic side view of.

In this embodiment, three hydraulic vibrators 1 to 3 are arranged in a straight line, and one
The case of supporting is taken as an example.

As shown in FIG. 2, the hydraulic exciters 1 to 3
The main body 10 of the hydraulic shaker installed on the foundation 7 and the main body 10
Shaft (piston rod) 11 reciprocally mounted inside
And an electro-hydraulic servo valve 12 capable of supplying pressure oil to reciprocate the vibration shaft 11,
It has 12 control units 13.

As the hydraulic vibrator 10, for example, a vibrator described in Japanese Patent Publication No. 2-23819 is suitable.

The control unit 13 includes a feedback adjuster 16 that receives a signal from a displacement detector 14 of the vibration shaft 11 via a signal conditioner 15 and a transmission circuit for transmitting a signal from a drive signal source 20 to the servo valve 12. A level adjuster 17, an error indicator 18, and a servo amplifier 19 are provided in series.

The level adjuster 17 has an additional voltage (DC voltage)
Is adjusted to adjust the mechanical level of the hydraulic exciter, that is, the protrusion dimension of the exciter shaft 11 when the hydraulic exciter is not excited (the dimension from the foundation 7 to the upper end of the exciter shaft 11). It has a setting function, and the output side of the feedback adjuster 16 is connected to the input side.

The error indicator 18 lights up when the vibration shaft 11 of the hydraulic vibrator deviates from the original set position, and indicates the fact.

Three hydraulic vibrators 1 having the above configuration
1 to 3 are interposed between one vibration table 5 and the foundation 7 as shown in FIG.

First, the drive signal sources 20 of the three hydraulic vibrators 1 to 3 are all turned off, and the respective hydraulic vibrators 1 to 3 are turned off.
3 (the upper end of each of the vibration shafts 11) is fastened to the vibration table 5 with bolts.

Next, the hydraulic vibrators 1, 2 located at both ends
Is set to a regular feedback amount (negative feedback amount), while the central hydraulic exciter 3 is set to a shallower feedback amount (soft control) than the regular feedback amount (hard control), and The drive signal sources 20 of the shakers 1 to 3 are simultaneously brought into “contact”.

Then, the hydraulic vibrators 1 and 2 perform regular vibration, but the hydraulic vibrator 3 is unstable, so that the vibration table 5 is set at a level determined by the hydraulic vibrators 1 and 2. The hydraulic vibrator 3 is set, and the (vibration shaft 11 of) the hydraulic vibrator 3 is pulled by the vibrating table 5, that is, on a line determined by the hydraulic vibrators 1 and 2. The vibrating shaft 11 shown by a dotted line of the hydraulic vibrator 3 in FIG. 1 shows this state.

Therefore, the servo system of the hydraulic vibrator 3 is disturbed, and the error indicator 18 of the hydraulic vibrator 3 is disturbed.
Is displayed on the screen.

Therefore, the level adjuster 17 of the hydraulic vibrator 3
The voltage is applied until the display of the error display 18 disappears. That is, the central hydraulic exciter 3 provides feedback.
Shallow [Reduce the amount of (feedback) return]
Control) and the vibration shaft 11 of the hydraulic vibrator 3 is uneasy.
Because it is constant (swaying), two hydraulics
The hydraulic exciter 3 is located on a straight line determined by both the exciters 1 and 2
(Shaking) vibrating shaft 11 is easily pulled up
I can do it. Then, about the central hydraulic exciter 3,
There is an error between the target command position of the vibration shaft 11 and the actual position.
Voltage is applied from the point of addition so that this error becomes zero.
Is done. As a result, the vibrating shaft 11 of the hydraulic vibrator 3
On the straight line determined by the two vibration axes of the hydraulic vibrator,
It may not be pulled up by both vibrating shafts 11 of machines 1 and 2.
And will be located on their own. In this state,
Return the shaker 3 to regular feedback (set)
And the excitation shaft 11 of the hydraulic exciter 3 includes three hydraulic exciters 1
Accurate positioning with the excitation axes of ~ 3 aligned in a straight line
It is determined.

With this operation, the mechanical level of the hydraulic exciter 3 is corrected. Therefore, at this time, the feedback amount of the hydraulic exciter 3 is set to a normal amount.

As a result, the three hydraulic vibrators 1 to 3 are connected to the vibration table 5 without excessively restricting the vibration table 5. Thus, in this embodiment,
With a simple operation, a vibration test apparatus of a multi-point excitation system can be obtained.

[0025]

[Effects of the Invention] As described above in detail, according to the multipoint vibration type vibration test apparatus of the present invention, it is easy to adjust the mechanical level of each hydraulic vibration apparatus in the multipoint vibration type vibration test apparatus. There is an advantage that can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a multipoint vibration type vibration test apparatus as one embodiment of the present invention.

FIG. 2 is a schematic side view of the hydraulic exciter, showing the control unit as a block diagram.

FIG. 3 is a perspective view of a conventional vibration test apparatus.

[Explanation of symbols]

 1-4 Hydraulic shaker 5 Shake table 10 Hydraulic shaker main body 11 Shake shaft 12 Servo valve 13 Control unit 14 Shake shaft displacement detector 16 Feedback adjuster 17 Level adjuster 18 Error display 20 Drive Signal source

Claims (1)

(57) [Scope of request for utility model registration] 1. A multi-point vibration type vibration testing apparatus a plurality of hydraulic shakers coupled to one vibration table, also the respective hydraulic shakers one, same vibration and pressure generating shafts a control unit of the electrohydraulic servo valve and the servo valve that can supply pressure oil to reciprocatingly oscillate the shaft, and a circuit for transmitting a signal of the driving signal source provided in the controller to the servo valve, in the same circuit through to
Configured to include an adjustment and setting levels adjusters mechanical level of the instrumentation the hydraulic vibrator, and adjustable feedback regulator feedback amount to the level controller of the displacement amount of the pressure vibration generating shaft by adjustment of the mechanical level of at least one hydraulic shakers of said plurality of hydraulic vibrators is, Zona to the hydraulic vibrator
The feedback amount of the level adjuster
Fees set for each level adjuster provided in the shaker
The mechanical level error of the hydraulic exciter is set at a value smaller than
Control the level adjuster of the hydraulic shakers such but becomes 0
Wherein the row of dividing by multipoint vibration type vibration testing apparatus.