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JP-2026075966-A - Test equipment

JP2026075966AJP 2026075966 AJP2026075966 AJP 2026075966AJP-2026075966-A

Abstract

[Problem] To provide a testing device that can improve the accuracy of the test. [Solution] In the test apparatus 1, a first sensor 35 for controlling the power supplied by the servo amplifier 72 to the linear motor vibrator 3 and a second sensor 36 for updating the control target value by the control unit 712 are provided independently. This eliminates the need for information processing time in the servo amplifier 72, reduces the time lag from measurement by the second sensor 36 to information acquisition by the control unit 712, suppresses delays in updating the control target value, makes it easier to generate vibrations according to the desired control target value, and improves the accuracy of the test. [Selection Diagram] Figure 1

Inventors

  • 増山 良太郎
  • 小原 雅輝
  • 小境 学

Assignees

  • 株式会社鷺宮製作所

Dates

Publication Date
20260511
Application Date
20241023

Claims (6)

  1. A test apparatus for measuring the characteristics of a test specimen by applying vibration to the specimen, An electrically powered vibration excitation method that generates vibrations when electricity is supplied, A first sensor and a second sensor for measuring the physical quantities of the motion state of the output section of the vibration excitation means, A control unit that generates a control target value for the vibration excitation means, The system includes a servo amplifier that receives the control target value and the measurement value of the first sensor as input, and controls the power supplied to the excitation means based on the control target value and the measurement value of the first sensor, The test apparatus is characterized in that the control unit receives the measurement value from the second sensor and updates the control target value based on the measurement value from the second sensor.
  2. A test apparatus for measuring the characteristics of a test specimen by applying vibration to the specimen, An electrically powered vibration excitation method that generates vibrations when electricity is supplied, A first sensor and a second sensor for measuring the physical quantities of the motion state of the output section of the vibration excitation means, A control unit that generates a control target value for the vibration excitation means, A servo amplifier receives the control target value and the measurement value of the first sensor as input and controls the power supplied to the excitation means based on the control target value and the measurement value of the first sensor. The system includes a processing unit for processing the measurement results of the characteristics of the test specimen, The test apparatus is characterized in that the measurement value of the second sensor is input to the processing unit.
  3. The test apparatus according to claim 1 or 2, characterized in that vibration is applied to a shock absorber as the test specimen to measure its characteristics.
  4. The test apparatus according to claim 1 or 2, characterized in that the first sensor and the second sensor measure displacement as a physical quantity of the motion state.
  5. The test apparatus according to claim 3, characterized in that the control unit generates a target value for controlling the velocity of the excitation means.
  6. The test apparatus according to claim 1 or 2, characterized in that the resolution of the second sensor is higher than the resolution of the first sensor.

Description

This invention relates to a testing apparatus for measuring characteristics by applying vibration to a test specimen. Generally, testing devices are known that apply vibration to test specimens such as shock absorbers to measure the characteristics of the specimens. In such testing devices, a higher-level control unit determines what kind of vibration to apply to the specimen, and a lower-level control unit, a servo amplifier, may provide feedback control to the excitation means that generates the vibration in order to realize this vibration. As an example of a device using the above-mentioned control unit and servo amplifier, an electronic component mounting device equipped with a host computer and a servo amplifier has been proposed (see, for example, Patent Document 1). In the electronic component mounting device described in Patent Document 1, commands from the host computer are sent to the servo amplifier via a motion controller, and a linear motor and a linear encoder are attached to the movable element, with position information being fed back from the linear encoder to the servo amplifier. Japanese Patent Publication No. 2011-14592 This is a front view showing a test apparatus according to an embodiment of the present invention.This is a cross-sectional view showing the vibration means of the test apparatus.Another cross-sectional view showing the vibration means of the aforementioned test apparatus. Embodiments of the present invention will be described with reference to the drawings. As shown in Figure 1, the test apparatus 1 of this embodiment uses a shock absorber 100 as a test specimen, applies vibration along the longitudinal direction (extension direction) of the shock absorber 100, and measures various characteristics of the shock absorber 100 during vibration. Examples of characteristics of the shock absorber 100 to be measured include the extension/retraction speed, piston load, and displacement in the direction of vibration. Furthermore, positional and temporal characteristics (displacement, velocity, acceleration) can be converted to other characteristics by measuring the time variation of one characteristic, and the characteristics (physical quantities) to be directly measured can be appropriately selected. That is, an appropriate type of sensor can be used depending on the characteristics of the shock absorber 100 and the test conditions. In this embodiment, as described later, the first sensor 35 and the second sensor 36, which are linear encoders, are used, but other sensors may be used instead or in addition. Also, the test specimen may be the shock absorber 100 alone, or it may be the shock absorber 100 combined with other components such as a spring. The test apparatus 1 comprises a main frame 2, a linear motor exciter 3 as an electric vibration excitation means, a relay means 4, a holding means 5, a braking means 6, a control unit 7, and a display device 8 such as a display. Hereinafter, the horizontal plane will be defined as the XY plane, the vertical direction as the Z direction, and the up and down directions in the Z direction will simply be referred to as up and down. The main frame 2 comprises a lower frame 21, an upper frame 22, and a lifting cylinder 23 connecting the lower frame 21 and the upper frame 22. The lower frame 21 is placed on the floor of a test site or similar location, and is equipped with a linear motor vibrator 3. It also has a support base 211 above the linear motor vibrator 3. The support base 211 is provided with multiple guide sections 212 for guiding the rod 42, which will be described later. The upper frame 22 is positioned at a predetermined height relative to the lower frame 21, and the holding means 5 is suspended from it. The lifting cylinder 23 is configured to adjust the height of the upper frame 22 relative to the lower frame 21 by extending and retracting. That is, the lifting cylinder 23 can be appropriately extended or retracted according to the length of the shock absorber 100. As shown in Figures 2 and 3, the linear motor vibrator 3 comprises a case 31, a pair of motor coils 32 fixed to the inner surface of the case 31, an output section 34 positioned to move linearly inside the motor coils 32 and protruding from the outside of the case 31, a magnet 33 fixed to the output section 34, and a first sensor 35 and a second sensor 36, which are independently provided. The linear motor vibrator 3 is positioned so that the vibration direction is the Z direction. The output section 34 is formed as a flat plate extending along the YZ plane and penetrates the support base 211 in the Z direction. Note that Figures 2 and 3 are cross-sectional views along mutually orthogonal cross-sections, and it is sufficient that the Z direction shown in Figures 2 and 3 coincides with the Z direction in Figure 1; the X and Y directions when the linear motor vibrator 3 is installed in the test apparatus 1 are arbitrary. The first sensor 35 and the second sensor 36 m