JP3273034B2 - Vibration test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration test apparatus, and more particularly, to a vibration test apparatus that generates vibration by supplying a vibration acceleration while exciting a vibrating means to a predetermined power.

[0002]

2. Description of the Related Art In many technical fields, a vibration test using a vibration test apparatus is performed. In particular, in a department that performs product development, a vibration test is performed to examine the durability, strength, reliability, and the like of a prototype or a product. At this time,
The test is for a long time. FIG. 4 is a block diagram showing a conventional example.

[0003] A conventional vibration test apparatus 1 includes a vibration generator 2,
It comprises a vibration controller 3, a power amplifier 4, an excitation power supply 5, an air pressure source unit 6, a cooling blower power supply circuit 7, and a cooling blower 8. The vibration generator 2 vibrates the sample 9 according to the AC drive current supplied from the power amplifier 4 and the DC excitation current supplied from the excitation power supply 5.

Here, the vibration generator 2 will be described in detail. FIG. 5 is a sectional view of a conventional vibration generator.
The vibration generator 2 is disclosed in Japanese Patent Application No. Hei 10-327204 by the present applicant.
It is the same as the vibration generator proposed in No. As shown in FIG. 5, the vibration generator 2 moves the vibration table (vibration body) 26 to which the sample 13 is fixed and the cylindrical shaft (guided portion) 28 of the vibration table 26 in the vibration direction (A direction). A guide portion 30 slidably supported, an air bearing 32 provided on the guide portion 30, a drive coil (drive source) 34 provided on the outer peripheral end of the vibration table 26, and the drive coil 34 are in the upper position. It has an upper exciting coil 36 arranged so as to face outside when moved, and a lower exciting coil 38 arranged so as to face outside when the drive coil 34 moves to a lower position.

A guide portion 3 is provided on the inner periphery of the cylindrical shaft 28.
A cylindrical cylinder (guided portion) 39 into which the zero guide shaft 30a is inserted is fitted and fixed. Since an alternating current (AC) drive current from the power amplifier 20 is supplied to the drive coil 34, the direction of the magnetic flux from the drive coil 34 changes alternately. Therefore, the vibration table 26 vibrates in the axial direction by attracting or repelling to the magnetic field from the upper excitation coil 36 and the lower excitation coil 38 constituting the electromagnet.

Further, the vibration generator 2 includes a holder member 40 having an upper coil storage chamber 40a and a lower coil storage chamber 40b for storing the upper excitation coil 36 and the lower excitation coil 38, and the upper excitation coil 36 and the lower excitation coil 38. And cylindrical members 42 and 44 inserted through the inner peripheral side of the first and second members. The drive coil 34 is formed in a thin cylindrical shape, and is driven in the axial direction while being inserted into a gap formed between the inner periphery of the holder member 40 and the outer periphery of the cylindrical members 42 and 44. You. At this time, the drive coil 34 is
0 and the cylindrical members 42 and 44 so as to move in a non-contact manner.

The upper coil storage chamber 40a of the holder member 40 is closed by the upper cover member 46, and the lower coil storage chamber 40b is closed by the lower cover member 48. The holder member 40 is supported from both sides by the support member 50. The support member 50 includes a base 50a installed on the floor, and a pair of arms 50b and 50c extending above both sides of the base 50a. The horizontal shafts 52 fixed to both side surfaces of the holder member 40 are inserted through the upper ends of the arms 50b and 50c. Therefore, the holder member 40 can rotate around the horizontal shaft 52. Thereby, the vibration generator 2 can generate the vibration direction not only in the vertical direction but also in the oblique direction or the horizontal direction.

In the center hole 44a of the cylindrical member 44,
In a state where the guide portion 30 is inserted, the lower cover member 4
8 is fixed to a mounting plate 53 fixed to the bottom of the mounting plate 8 via mounting bolts 53a by fastening bolts 55 and nuts 57. The cylindrical shaft 28 of the vibration table 26 and the guide shaft 3
0a are housed in a state where they are slidably fitted to each other.

The holder member 40, the cylindrical member 42,
The 44, upper cover member 46, and lower cover member 48 constitute a yoke (iron core) of the electromagnet. Guide part 30
An axial air supply passage 54 formed so as to extend in the axial direction, and a plurality of horizontal air supply passages each having one end communicating with the axial air supply passage 54 and the other end extending in the radial direction of the guide portion 30. It has a supply passage 56 and a plurality of air outlets 58 communicating with the horizontal air supply passage 56 and opening on the outer periphery of the guide portion 30.

The plurality of horizontal air supply passages 56 are arranged in parallel at predetermined intervals in the axial direction, and are also radially arranged at predetermined angular intervals in the circumferential direction. The outer peripheral surface of the guide portion 30 and the inner peripheral surface of the cylinder 39 of the vibration table 26 oppose each other with a small gap.
Since a plurality of air outlets 58 are provided at predetermined intervals on the outer peripheral surface of the, a uniform air pressure layer is formed on the entire circumference between the guide portion 30 and the cylinder 39, and the cylinder 39 is It is slidably guided in a non-contact state through the pneumatic layer.

An air spring chamber 60 is formed between the upper end 30b of the guide portion 30 in the axial direction and the cylinder 39. The air spring chamber 60 functions as an air spring because the air pressure blown out from the plurality of air outlets 58 accumulates. Therefore, the axial static load of the vibration table 26 is elastically supported by the air pressure of the air spring chamber 60.

The guide section 30 is provided with an exhaust passage 62 (indicated by a broken line in FIG. 2) penetrating in the axial direction.
That is, the exhaust passage 62 has an upper end opening to the upper end portion 30b of the guide portion 30 and communicating with the air spring chamber 60, and a lower end opening to the central hole 44a. And the central hole 44
a includes an air supply line 6 from the pneumatic source unit 16;
4 and an exhaust pipe 66 are inserted. Air supply line 6
4 is connected to the axial air supply passage 54, and the exhaust pipe 66 is connected to the exhaust passage 62.

The air supply line 64 and the exhaust line 66 are supplied to the air pressure source unit 6. The vibration of the vibration table 26 of the vibration generator 2 and the vibration of the sample 9 are detected by an acceleration sensor. The detection signal detected by the acceleration sensor is supplied to the vibration controller 3. The vibration controller 3 compares the vibration detection signal value of the sample 9 with a preset target value, and controls the vibration generator so as to achieve the target vibration.

The excitation signal generated by the vibration controller 3 is supplied to a power amplifier 4. The power amplifier 4 power-amplifies the vibration signal supplied from the vibration controller 3. The excitation signal power-amplified by the power amplifier 4 is supplied to a drive coil 34 provided in the vibration generator 2. Also, the vibration generator 2
A DC current is supplied from the excitation power supply 5 to the excitation coils 36 and 38 of FIG. The vibration generator 2 is excited by the DC current supplied from the excitation power supply 5 and vibrates the vibration table 10 in the direction of arrow A by the excitation signal supplied from the power amplifier 4.

The pneumatic source unit 6 supplies compressed air to the cylinder of the vibration generator 2. The compressed air supplied from the air pressure source unit 6 is supplied to the cylinder and used as an air spring, and is discharged from the side surface of the bearing to function as an air bearing. The temperature of the vibration generator 2 becomes high because it vibrates for a long time. Therefore, fresh air is blown from the outside by the cooling blower 8 to be cooled. The cooling blower power supply circuit 7 supplies driving power to the cooling blower 8.

At this time, the magnitude of the excitation of the vibration generator 2 was set to a required excitation level when the vibration was generated at the maximum vibration capacity. Similarly, the cooling capacity of the cooling blower 8 is also driven so as to obtain a cooling capacity that can withstand when vibrating at the maximum vibration capacity. Next, the operation of the conventional vibration test machine 1 will be described.

FIG. 6 shows an operation waveform diagram of an example of the related art. 6 (A) is an output signal of the excitation force controller 3, FIG. 6 (B) is an output signal of the power amplifier 4, FIG. 6 (C) is an output current of the excitation power supply 5, and FIG. 3 shows a state of a driving magnetic field of the machine 2. Assuming that the output amplitude of the excitation force controller 3 is ± V1 as shown by the broken line in FIG. 6A, the signal shown by the broken line in FIG. The signal is amplified by the power as shown by (1) and becomes a signal of amplitude ± V11, and is supplied to the drive coil 34 of the vibration generator 2.

The excitation power supply 5 supplies a constant current I0 to the vibration generator 2 as an excitation current as shown by a broken line in FIG. Therefore, the driving coil 34 of the vibration generator 2 is driven by a signal as shown by a broken line in FIG. 6B, and the exciting coils 36 and 38 are driven by a constant DC current I0 as shown in FIG. As a result, the vibration generator 2
It is driven by a driving magnetic field as shown by a broken line in (D).

When the detection result of the amplitude ± V2 shown by the solid line in FIG. 6A of the excitation force controller 3 is supplied, the signal shown by the broken line in FIG. 4), the power is amplified as shown by the broken line to obtain a signal having an amplitude of ± V11, which is supplied to the drive coil 34 of the vibration generator 2. Excitation power supply 5
Generates a current I0 as shown in FIG.
To supply. Therefore, the drive coil 34 of the vibration generator 2 is driven by a signal as shown by a solid line in FIG. 6B, and the exciting coils 36 and 38 are driven by a constant DC current I0 as shown by a solid line in FIG. When driven, the vibration generator 2
Are driven by a driving magnetic field as shown by a solid line in FIG.

As described above, in the conventional vibration test apparatus 1,
As shown by the solid line in FIG.
When this was vibrated, an unnecessary exciting magnetic field was generated.

[0021]

However, in the conventional vibration test apparatus, the exciting current of the exciting means is not controlled by the set exciting force but by the maximum exciting current which is the electric power capable of the exciting force at the maximum capacity. Since it is set, when operating with an excitation force smaller than the maximum capacity, there is a problem that an excessively large excitation power is applied and unnecessary power consumption is consumed.

The present invention has been made in view of the above points, and has as its object to provide a vibration test apparatus capable of reducing power consumption.

[0023]

According to the present invention, an exciting force applied to a sample is detected, and an excitation level is controlled in accordance with the detected exciting force. According to the present invention, the excitation force applied to the sample is detected, and the excitation level is set to a level corresponding to the excitation force. For example, when the excitation force applied to the sample is large, the excitation level is increased and applied to the sample. By reducing the excitation level when the excitation force is small, the excitation force applied to the sample is small, but an excessively large excitation level is not applied, and the power can be minimized.

[0024]

[0025]

FIG. 1 is a block diagram showing an embodiment of the present invention. 4, the same components as those of FIG. 4 are denoted by the same reference numerals, and the description thereof will be omitted. The vibration tester 100 of the present embodiment includes a vibration generator 2, a vibration controller 3, a power amplifier 4, an excitation power supply 101, a pneumatic power supply unit 6, a cooling blower power supply circuit 102, a capacity switching unit 103, and automatic / manual switching. The unit 104 includes a vibration detection circuit 105.

The excitation power supply 101 is connected to the power control circuit 105, and controls the output DC current in accordance with the result of the detection of the exciting force by the power control circuit 105. The cooling blower power supply circuit 102 is connected to the power control circuit 105,
The power supply to the cooling blower 8 is controlled according to the result of the detection of the exciting force by the power control circuit 105. Power control circuit 10
Reference numeral 5 is connected to the vibration controller 3 and the capability switching unit 103 via the automatic / manual switching unit 104. When the automatic / manual switching unit 104 is switched to the automatic side, the output of the vibration controller 3 is supplied to the power control circuit 105. When the automatic / manual switching unit 104 is switched to the manual side, the output is supplied to the capacity switching unit 103.

When the automatic / manual switching unit 104 is switched to the automatic side and the output of the vibration controller 3 is supplied, the power control circuit 105 controls the sample according to the excitation signal supplied from the vibration controller 3. The excitation force applied to 9 is detected. The power control circuit 105 detects the magnitude of the excitation force by detecting the amplitude of the excitation signal supplied from the vibration controller 3. If the amplitude of the excitation signal supplied from the vibration controller 3 is larger than the first level, it is determined that the excitation force is large, and the DC power supplied from the excitation power supply 101 to the excitation coils 36 and 38 is the maximum DC current. The current is controlled to be 1.

If the amplitude of the excitation signal supplied from the vibration controller 3 is smaller than the first level and larger than the second level, it is determined that the excitation force is moderate, and the excitation power supply 101 The DC current supplied to the exciting coils 36 and 38 is controlled to have a second current value. Further, if the amplitude of the excitation signal supplied from the vibration controller 3 is smaller than the second level, it is determined that the excitation force is small, and
The DC current supplied to the exciting coils 36 and 38 from
Is controlled so that the current value becomes as follows.

At this time, the power control circuit 105
If the amplitude of the excitation signal supplied from the vibration controller 3 is larger than the first level, it is determined that the excitation force is large, and the drive voltage supplied from the cooling blower power supply circuit 102 to the cooling blower 8 is increased. Blower power supply circuit 1 for cooling
02 is controlled. Further, if the amplitude of the excitation signal supplied from the vibration controller 3 is smaller than the first level and larger than the second level, it is determined that the excitation force is moderate, and the cooling blower power supply circuit 102 The cooling blower power supply circuit 102 is controlled so that the drive voltage supplied to the cooling blower 8 becomes medium.

If the amplitude of the vibration signal supplied from the vibration controller 3 is smaller than the second level, it is determined that the vibration force is small, the vibration force is determined to be small, and the cooling blower is determined. The cooling blower power supply circuit 102 is controlled so that the drive voltage supplied from the power supply circuit 102 to the cooling blower 8 is minimized. The power control circuit 105 includes the automatic / manual switching unit 1
When the output of the vibration controller 3 is being supplied and the output of the vibration controller 3 is being supplied, the excitation power supply 101 and the cooling blower power supply circuit 102 are switched according to a capability switching signal corresponding to the capability supplied from the capability switch 103. Control.

The power control circuit 105 includes a capacity switch 103
The magnitude of the capability switching signal corresponding to the capability supplied from is detected. If the capacity switching signal supplied from the capacity switch 103 is larger than the first level, it is determined that the exciting force is large, and the DC current supplied from the excitation power supply 101 to the excitation coils 36 and 38 is the first maximum. Control is performed so that the current value is obtained.

If the capacity switching signal supplied from the capacity switch 103 is smaller than the first level and larger than the second level, it is determined that the exciting force is moderate, and the excitation power supply 101 excites the excitation power. The DC current supplied to the coils 36 and 38 is controlled to have a second current value. Further, if the capacity switching signal supplied from the capacity switch 103 is smaller than the second level, it is determined that the exciting force is small, and the DC current supplied from the excitation power supply 101 to the excitation coils 36 and 38 is changed to the third level. Control is performed so that the current value is obtained.

At this time, the power control circuit 105
If the capacity switching signal supplied from the capacity switch 103 is larger than the first level, it is determined that the exciting force is large, and the drive voltage supplied from the cooling blower power supply circuit 102 to the cooling blower 8 becomes maximum. The cooling blower power supply circuit 102 is controlled so that Further, if the capacity switching signal supplied from the capacity switch 103 is smaller than the first level and larger than the second level, it is determined that the exciting force is medium, and the cooling blower power supply circuit 102 The cooling blower power supply circuit 102 is controlled so that the driving voltage supplied to the blower 8 becomes medium.

If the capacity switching signal supplied from the capacity switch 103 is smaller than the second level, it is determined that the exciting force is small, and it is determined that the exciting force is small. The cooling blower power supply circuit 10 is controlled so that the driving voltage supplied from the circuit 102 to the cooling blower 8 is minimized.
2 is controlled. Next, the operation of the present embodiment will be described.

FIG. 2 shows an operation waveform diagram of one embodiment of the present invention. FIG. 2A is an output signal of the excitation force controller 3, and FIG.
2 (B) is an output signal of the power amplifier 4, FIG. 2 (C) is an output current of the excitation power supply 101, FIG. 2 (D) is a state of a driving magnetic field of the vibration generator 2, and FIG. 2 (E) is a cooling blower 8. Shows the cooling capacity of Assuming that the amplitude of the output signal of the excitation force detector 3 is ± V1 as shown by a broken line in FIG.
The signal indicated by the broken line in FIG.
As shown by the dashed line in (B), the signal is power-amplified into a signal having an amplitude of ± V11 and supplied to the drive coil 34 of the vibration generator 2.

At this time, the power control circuit 105
It is assumed that an amplitude ± V1 indicated by a broken line in FIG. The amplitude ± V indicated by a broken line in FIG.
1 is detected, the excitation power supply 101
A current I2 as shown by a broken line in FIG.
1 to the vibration generator 2. Therefore, the vibration generator 2
2B is driven by a signal as shown by a broken line in FIG. 2B, and the exciting coils 36 and 38 are driven by a DC current as shown by a broken line in FIG. 2 is driven by a drive magnetic field as shown by a broken line in FIG. At this time, the cooling blower power supply circuit 10
2 is controlled, and the cooling blower 8 is controlled so as to have a cooling capacity indicated by a broken line in FIG.

It is assumed that the power control circuit 105 detects the amplitude ± V2 shown by the solid line in FIG. Power control circuit 10
5, when the detection result of the amplitude ± V2 indicated by the solid line in FIG. 2A is detected, the excitation power supply 101 supplies the current I1 as indicated by the solid line in FIG. To supply. Therefore, the drive coil 3 of the vibration generator 2
4 is driven by a signal as shown by a solid line in FIG. 2 (B), and the exciting coils 36 and 38 are driven by a DC current as shown by a solid line in FIG. 2 (C). FIG.
It is driven by a driving magnetic field as shown by the solid line in (D). At this time, the cooling blower power supply circuit 102 is controlled, and the cooling blower 8 is controlled so as to have a cooling capacity indicated by a solid line in FIG.

As described above, when the exciting force on the sample 9 is small, the exciting coil 3 supplied from the exciting power source 101
The current supplied to 6, 6 is reduced, and power consumption can be reduced. Similarly, the cooling capacity of the cooling blower 8 can be reduced, and the power consumption can be reduced. FIG. 3 shows a characteristic diagram of the excitation force with respect to the excitation power in one embodiment of the present invention.

As shown in FIG. 3, the exciting power when the maximum exciting force is generated is 1 [KVA], but when the exciting force is reduced to 1/2, the exciting power is reduced to about 1/3 [KVA]. Since the power can be reduced, the power consumption can be significantly reduced by controlling the excitation power in accordance with the exciting force. In this embodiment, the outputs of the excitation power supply 101 and the cooling blower power supply circuit 102 are controlled stepwise by the power control circuit 105. However, the present invention is not limited to this. May be controlled. Further, the capability switching unit 103 may be switched continuously.

[0040]

As described above, according to the present invention, the exciting force applied to the sample is detected, and the exciting current is set to an amount corresponding to the required exciting force. For example, the exciting force applied to the sample is large. Sometimes, the excitation level is increased, and the excitation current is reduced when the excitation force applied to the sample is small, so that the excitation force applied to the sample is small but an excessively large excitation level is not applied. In addition, the power consumption can be minimized, and power can be saved.

[0041]

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is an operation waveform diagram of one embodiment of the present invention.

FIG. 3 is a characteristic diagram of excitation force with respect to excitation power according to one embodiment of the present invention.

FIG. 4 is a block diagram of a conventional example.

FIG. 5 is a cross-sectional view of a conventional vibration generator.

FIG. 6 is an operation waveform diagram of a conventional example.

[Explanation of symbols]

 2 Vibration Generator 3 Excitation Controller 4 Power Amplifier 6 Pneumatic Source Unit 8 Cooling Blower 9 Sample 100 Vibration Tester 101 Excitation Power Supply 102 Cooling Blower Power Circuit 103 Capability Switching Circuit 104 Automatic / Manual Switching Circuit 105 Excitation Force Detection circuit

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01M 7/02

Claims (1)

(57) [Claims] 1. A vibration test apparatus having a vibration means for vibrating a sample by supplying a vibration acceleration according to a vibration force to the sample in a state of being excited to a predetermined power, wherein a vibration force applied to the sample is provided. A vibration test apparatus, comprising: an exciting force detecting means for detecting the excitation force; and an exciting power control means for controlling the exciting power according to the exciting force detected by the exciting force detecting means.