JPS6325292B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

This invention is a vibration table that combines two vibration tables into a set, each vibration table vibrates light weight and high acceleration, and vibrates a heavy and large structure with the two vibration tables. This control device is designed to eliminate relative displacement of the position of the excitation table particularly when controlling each vibrating table individually and controlling two vibrating tables simultaneously.

[Conventional technology]

Conventionally, as an excitation device that vibrates a large or heavy structure using multiple excitation tables, as is known from Japanese Patent Publication No. 60-1494, a single excitation table is used. Connect multiple vibration tables and control these vibration machines synchronously to vibrate the vibration table.
The aim was to obtain the necessary excitation force for the structure.

[Problems to be solved by the invention]

Conventional vibration excitation devices such as those described above obtain excitation force by coupling multiple vibrators to one vibration table, so large excitation is required to excite large structures. As a table is required, the weight of the vibration table increases accordingly, and the vibration table needs to have a large vibration force. In addition, when such a large vibration table is also used to vibrate a light, heavy, and small structure, most of the excitation force is spent shaking the large vibration table, and the light, weight, and small structure cannot be moved at high acceleration. It becomes difficult to excite. In addition, when one vibration table is vibrated by multiple vibration machines, it is difficult to maintain balance between the vibration machines, and unbalanced movements are likely to occur in the vibration table, which impairs test accuracy. There was a problem. This invention solves the above-mentioned problems, and can be used for high-acceleration excitation of lightweight, small structures, and for excitation of heavy, heavy, large-scale structures.
It is an object of the present invention to provide a vibration table control device that facilitates balanced vibration control between vibration tables.

[Means to solve the problem]

The vibration table control device of the present invention has a set of two vibration tables each having a vibration exciter and its feedback input system, and uses the displacement difference of each vibration table to the input system of one vibration table. an adder that feeds back to
There is a standalone operation mode in which input signals are supplied to the input systems of each vibration table and the feedback system from the adder to one of the vibration table input systems is separated; It is provided with opening/closing means for supplying an input signal and switching to a simultaneous operation mode for connecting a feedback system from the adder to the one of the vibration table input systems.

[Effect]

In this invention, when the opening/closing means is deenergized, each input signal is supplied to the feedback input system of each vibration table, and each vibration table is operated separately. When the means is energized, the same input signal is supplied to the feedback input system of each vibration table, and the displacement difference signal from the adder is input to one of the feedback input systems. It will be driven. Therefore, in this invention, when the vibration table is in the simultaneous operation mode, heavy and large structures can be vibrated, and when the vibration table is in the single operation mode, it is possible to vibrate light and heavy and small structures. High-acceleration excitation becomes possible.

【Example】

Embodiments of the present invention will be described below with reference to the drawings. This inventive device consists of a vibration table 1 consisting of two vibration tables.
a, 1b, and each of the vibration tables 1a, 1b is provided with a separate vibration exciter 2a, 2b,
The output sides of servo amplifiers 3a, 3b are connected to the vibration exciters 2a, 2b, and displacement meters 4a, 4b for displacement feedback are connected to each vibration table 1a, 1b. Moreover, each displacement signal of displacement meters 4a and 4b is transmitted to each servo amplifier 3a and 3.
On the other hand, it is fed back to adder 5, and one of the signals is added as + and the other as -, and the output signal of adder 5 is input to adder 5 when the relay is normally open. Feedback is provided to one of the servo amplifiers 3b via the contact 6a. In addition, each servo amplifier 3
Input signals Sa and Sb from terminals Ta and Tb are input to a and 3b.
has been introduced, and both terminals
Ta and Tb are opened and closed by a normally open contact 6a of a relay. Next, the operation of the inventive device configured as described above will be explained. First, when the vibration tables 1a and 1b are in the individual operation mode, a relay (not shown) is deenergized and its contacts 6a and 6b are kept open. As a result, the signals Sa and Sb are inputted from the respective terminals Ta and Tb, and the servo amplifiers 3a and 3 are inputted, respectively.
b, and the vibrating machines 2a and 2b are operated to vibrate the respective vibrating tables 1a and 1b. At this time, the displacement signals from the displacement meters 4a, 4b are fed back to the servo amplifiers 3a, 3b of the vibration machines 2a, 2b of both vibration tables 1a, 1b. The displacement is not fed back to one servo amplifier 3b. On the other hand, 2
When the vibrating tables 1a and 1b of the table are operated at the same time, their contacts 6a and 6b are activated by the relay.
Since it is turned on, input terminals Ta and Tb are short-circuited,
One of the input signals Sa and Sb is applied to the servo amplifiers 3a and 3b. At this time, the displacements of the vibration tables 1a and 1b are detected by the displacement meters 4a and 4b and input to the adder 5.
If there is a relative displacement between the two excitation tables 1a, a signal taken out as a difference in displacement from the adder 5 is fed back to the vibration exciter 2b via the servo amplifier 3b so that this relative displacement becomes 0, and both vibration tables 1a , 1b are controlled so that the movements of one of the excitation tables 1a are always equal. As described above, according to the present invention, when two excitation tables are set as a set and the two excitation tables are set to a mode in which they are operated simultaneously by the opening/closing means, the displacement of the two excitation tables is The difference is extracted by an adder, and this displacement difference is fed back to the input system of one of the vibration tables, so there is no relative displacement between the two vibration tables, and the same operating conditions are used to control heavy and large structures. By switching the opening/closing means to put each vibration table into independent operation mode, it is possible to vibrate small, lightweight structures with high acceleration, and the vibration table can be made larger. Therefore, it is possible to obtain an excitation device that does not cause problems and can easily control balanced excitation.

[Brief explanation of drawings]

The drawing is a block diagram of a vibration table control device according to the present invention. 1a, 1b... Vibration table, 2a, 2b... Vibrator, 3a, 3b... Servo amplifier, 4a, 4b...
...Displacement meter, 5...Adder, 6a, 6b...Relay contact.

Claims (1)

[Claims] 1. A set of two vibration tables, an input system that includes a vibration machine that vibrates each vibration table separately, and a displacement feedback system, and a system that calculates the displacement difference between the vibration tables. an adder that detects and feeds back only to the input system of one of the vibration tables; and an adder that supplies respective input signals to the input systems of each of the vibration tables and from the adder to the input system of one of the vibration tables. A standalone operation mode in which the feedback system of one of the vibration tables is separated, and the same input signal can be supplied to the input system of each of the vibration tables, and the feedback system from the adder to the input system of one of the vibration tables is connected. A vibration table control device consisting of an opening/closing means for switching to simultaneous operation mode.