JPH0555043U - Torsional vibration test equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a test device capable of accurately performing a torsion test by eliminating an artificial measurement error. [Structure] A base 11 to which one end of a test piece 12 is attached, and a suspension which is attached to the other end of the test piece 12 and has a rotor 14 and a weight for inertia 15 and a counterweight 16 at the other end. The rotor 13 includes a rotor 13 suspended by a member 17, a gap sensor 19 disposed near the outer peripheral edge of the rotor 14, and a recording device 20 for recording a signal from the gap sensor 19. A torsional vibration testing device formed so that the outer peripheral edge of 14 is a curve in which the radius of the half circumference changes in proportion to the angle.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a torsional vibration testing device, and more particularly, to a torsional vibration testing device used for obtaining internal friction and damping rate of a metal material.

[0002]

[Prior Art]

 In general, for metallic materials, especially for damping alloys made of new materials, internal friction and damping rate are determined. Torsional vibration test equipment is used to determine the internal friction and damping rate of these metallic materials. As a device for measuring such a characteristic, a device using an optical lever method has been conventionally known.

An example thereof will be described with reference to FIG. 4. One end of a test piece 2 formed of a metal material as a wire is attached to the base 1, and the other end of this test piece is attached to the lower part of the rotating body 3. It has become. A reflector 4 and an inertia dangle 5 are attached to the rotating body 3, and a suspending member 7 having a counterweight 6 at one end is attached to the upper portion thereof. Tension is applied to the test piece 2 by suspending it via. The laser light L projected from the laser oscillator 9 is reflected by the reflecting mirror 4 and projected on the scale 10, and the light spot is projected on the scale 10. As described above, in the conventional test apparatus, the rotation angle of the reflecting mirror 4, that is, the rotation angle when the rotating body 3 horizontally rotates is enlarged on the scale 10 by using the optical lever. The internal friction and damping rate are obtained by visually observing the light spot of the angle and determining the angle change and time.

[0004]

[Problems to be solved by the device]

 However, the conventional torsional vibration testing device as described above has a problem. That is, since the scale 10 is generally separated from the rotating body 3, its positioning is artificial, and the change in the position of the light spot moving on the scale 10 is read by the naked eye, so that the measurement error is caused. Occurs, and as a result, precise measurement cannot be performed. Furthermore, this test device had the problem that it could only read at the maximum amplitude point and could not obtain an accurate frequency value.

[0005]

[Means for Solving the Problems]

 The present invention has been made to solve the above-mentioned conventional problems, and has a base for mounting one end of a test piece, a rotor and an inertia drip for mounting the other end of the test piece. And a rotating body suspended by a suspending member having a counterweight at the other end, a gap sensor arranged close to the outer peripheral edge of the rotor, and a recording device for recording the signal of the gap sensor. The present invention provides a torsional vibration testing device in which the outer peripheral edge of the rotor is formed into a curved surface whose half radius changes in proportion to the angle.

[0006]

[Work]

 In the torsional vibration testing apparatus according to the present invention, an electric signal proportional to the displacement angle due to the rotation of the rotor is taken out by the gap sensor, and the electric signal is recorded in the recording device as an attenuation waveform.

[0007]

【Example】

 An embodiment of the torsional vibration test apparatus according to the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a schematic side view of the torsional vibration test apparatus, in which 11 is a base on which the lower end of the test piece 12 is attached, and this base 11 can be moved with casters or the like arranged under the base 11 if necessary. It is like this. The rotating body 13 to which the upper end of the test piece 12 is attached is provided with a rotor 14 and an inertia weight drip 15, and an upper end of the rotating member 13 has one end of a hanging member 17 such as a Tegus having a counterweight 16 at one end. It is attached via a pulley 18 supported by a frame (not shown). That is, the rotating body 13 is suspended by the counterweight 16 and the suspending member 17. The configuration so far is the same as the conventional device.

The rotor 14 is specially devised in the present invention, and as shown in FIGS. 2 and 3, the rotor 14 is formed into a cap-shaped body having an open lower portion, and its outer peripheral edge 14a is a half circumference. Is formed so as to have a curved surface whose radius r changes in proportion to the angle. Further, if necessary, angle scale lines 14b are drawn on the upper surface at equal angles so that the rotation angle of the rotor 14 can be visually checked.

A gap sensor 19 supported by a gap adjuster or the like (not shown) is arranged in the vicinity of the rotor 14 configured as described above, and the signal from the gap sensor 19 is transferred from the circuit L ₁ to the displacement meter 20. The signal is guided and introduced into a recording device 21 such as an FFT analyzer. A thermocouple-type thermometer 22 is provided near the test piece 12 so that the temperature of the test piece 12 can be indirectly measured.

In the above configuration, when measuring the internal friction and the damping rate of the test piece 12, if the test piece 12 is set in the torsional vibration test apparatus as shown in FIG. Give the rotation of. Then, the rotor 14 reciprocally rotates, but at this time, the distance between the outer peripheral edge 14a and the gap sensor 19 held at a predetermined interval changes in proportion to the rotation angle.

This change in distance is detected by the gap sensor 19 as an electric output, and the signal is input to the displacement meter 20 where it is converted as a displacement amount and introduced into the recording device 21. This displacement amount is continuously guided to the recording device 21 while the rotor 14 is rotating, so that it is recorded as an attenuation waveform and displayed as needed. In the present invention, the curve formed on the outer peripheral edge 14a of the rotor 14 has an important meaning. Regarding this shape, the gap sensor 19 arranged facing the outer peripheral edge 14a has a rotor 14a. It is arranged to generate a signal proportional to the rotation angle of the.

[0012]

The torsional vibration testing apparatus of the present invention has a base to which one end of a test piece is attached, the other end of the test piece, a rotor and a weight for inertia, and a counter at the other end. The rotor comprises a rotating body suspended by a suspending member having a tar weight, a gap sensor arranged close to the outer peripheral edge of the rotor, and a recording device for recording a signal of the gap sensor. The outer peripheral edge is formed so as to have a curved surface whose half radius changes in proportion to the angle.

Therefore, since the rotation angle of the rotor is detected and recorded by the gap sensor, it is possible to perform not only precise measurement without using an optical lever but also automatic measurement. Since the rotation angle can be measured, the work can be saved and the damping frequency can be measured.

[Brief description of drawings]

FIG. 1 is a schematic side view of a torsional vibration test apparatus according to the present invention.

FIG. 2 is a plan view of a rotor of the torsional vibration testing device.

3 is a partially cutaway side view of the rotor shown in FIG.

FIG. 4 is a schematic side view of a conventional torsional vibration test apparatus.

[Explanation of symbols]

1, 11 Base 2, 12 Test piece 3, 13 Rotor 4 Reflector 5, 15 Inertia heavy suspension 6, 16 Counterweight 7, 17 Suspension member 8, 18 Pulley 9 Laser 10 Scale 14 Rotor 19 Gap sensor 20 Displacement meter 21 Recording device 23 Thermocouple

Claims (1)

[Scope of utility model registration request] 1. A base to which one end of a test piece is attached, and the other end of the test piece, and a suspension member having a rotor and a weight for inertia and a counterweight at the other end. The rotor, a gap sensor disposed close to the outer peripheral edge of the rotor, and a recording device for recording a signal from the gap sensor. The outer peripheral edge of the rotor has a radius of a half circle. A torsional vibration test apparatus, which is formed so as to have a curved surface that changes in proportion to.