JPS5912319A - Method for measuring energy transmitting property - Google Patents

Abstract

PURPOSE:To measure the energy transmitting property of a sample, by making a fundamental burst wave radiate to a sample to be measured, detecting the wave as an alternating wave, and processing the result by a computer. CONSTITUTION:A fundamental burst wave, which is generated by a tone burst wave oscillator 3, is applied to a sample to be measured 1, and the sample is vibrated. Meanwhile, an alternating wave is detected by a receiver 8, which is contacted with a part of the sample 1. By a waveform shaping circuit 11, which updates the peak of the alternating wave and stores the result, a DC output 19, which matches with the amplitude of the alternating wave, is obtained. A/D conversion of the DC output 19 is performed. Then, the data 25 is processed by a computer 18, and the result is displayed on a display device 30. The energy transmitting property of the sample 1 is measured from the value of the gradient of the rising part of the vibration application.

Description

[Detailed description of the invention] The present invention relates to a method for measuring energy transferability.

BACKGROUND ART Conventionally, as a method of measuring the energy transferability of a sample when a mechanical stimulus is applied to the sample, a method of displaying energy loss from a phase delay, such as a viscoelastic spectrometer, is known.

However, in such methods of mechanically applying stimulation from the outside and the devices used therefor, there is always the problem of resonance points, and for this reason, the frequency of stimulation is also 100 hertz (Hz).
) was the upper limit of oak. When the frequency exceeds 100 Hz, expensive equipment had to be manufactured specifically for that purpose.

It is an object of the present invention to solve these problems and to make it possible to easily measure energy transferability at relatively high frequencies using an inexpensive device. Therefore, the feature of the present invention is to radiate and excite a fundamental burst wave generated from a tone burst wave oscillator to a sample to be measured, and to detect an alternating wave using a geophone that is in contact with a part of the sample. Then, a waveform shaping circuit that updates and stores the peak of the alternating wave obtains a DC output that matches the amplitude of the alternating wave, A/D converts the DC output, processes the data using a computer, and displays it. The purpose of this method is to measure the energy transfer properties of the sample based on the value of the gradient of the rising edge of the excitation, which is displayed on the device.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

In FIG. 1, (1) is a sample to be measured, which is preferably spherical or nearly spherical in shape, but may also be in the shape of a cubic (rectangular parallelepiped) rod. The Hathorn burst wave is used as a fundamental wave to check the energy transferability of this sample (1). The basic m of this tone burst wave uses an audible frequency band. For example, as shown in Fig. 2, the tone burst wave (2) is shown with time T (μ5ec) on the horizontal axis and amplitude (G) on the vertical axis, 0N with 4 to 8 waves ON and 20 to 40 waves OFF. -O
Use one with FF wave number. (3) in FIG. 1 is a tone burst wave oscillator that generates such a tone burst wave (2), and (4) is a high voltage output circuit that increases the output from the oscillator (3), which uses a piezoelectric element ( 5) connected to
The output from the oscillator (3) is increased to sufficient voltage and current to drive the piezoelectric element (5).

In this way, the piezoelectric element (5) is forcibly driven.

(6) is a horn that contacts a part of the sample (1) and concentrates the sound energy at the tip (lower end of the figure).
radiate to. The horn (6) may be made of metal or plastic, but plastic is preferred because it can be made smaller. (7) is a bell and a horn (6)-4)
- In order to improve the contact between the tip and the sample (1), a horn (6) and a piezoelectric element (5) are attached to press from both sides. The shape of the horn (6) is appropriately determined by the frequency and load 5, and the weight of the bell (7) is determined by the sample (1).
) to be determined appropriately depending on the material and hardness.

(8) is a geophone that is placed in a position to sandwich the sample (1) together with the tip of the horn (6), and is placed in contact with a part of the sample (1), as shown in Figure 3. An alternating wave like that (9)...
・Detect. 00) is a preamplifier circuit, which functions to amplify the alternating wave (9) (sound wave) detected by the geophone (8). The output of the preamplifier circuit 01 is input to a waveform shaping circuit (10).

Further, the output of the preamplifier circuit 00 is supplied to the timing pulse generator 03. and branched into Pea Leaf Honda-04).
C5 human power θOo0 is connected. The timing signal α from the timing pulse generator 03 is input manually to the waveform shaping circuit (1υ).

This circuit is necessary for processing by the waveform shaping circuit (1υ is the data computer 08). Normally, the A/D exchange rate for computer α8) processing is 5
It is sampled every 0 to 100μ, but for example,
When a 5KHz burst wave (2) is used, the period of the oscillated alternating wave (9) is about 200μsec.''The sampling every 50 to 100μ as described in 2 above shows the temporal change in the wave amplitude (G). It becomes difficult to measure.

Therefore, based on the timing signal α force from the timing pulse generator 03, the peak (P) of the alternating wave force Q21 is determined.
... are updated and stored by the waveform shaping circuit (l]). As a result, the DC output (Igl) that matches the amplitude (G) of the alternating wave (9) as shown in FIG. 3 is input to the conversion circuit.

/D ■υ is a timing pulse generator, which is an oscillator (3)
A signal is input to the peak level Holter (14) and the A7/D conversion circuit (A), and its output pulse (C) (C)
will be sent.

Peak level holder 04) When data is processed by computer α8), the maximum value of the waveform used for data standardization is output as a peak level output (product) and sent to the A/D conversion circuit. is input. (In addition,
The maximum value of the waveform can also be calculated from the output 09 of the waveform shaping circuit 0υ, but by using the peak level output as shown in Figure 1, calculations for data processing can be simplified. The calculation time of the computer 081 is shortened by increasing the number of units. ) Therefore, in the A/D conversion circuit (A), the output (product) from the DC output (+9. and peak level holder 04) from the waveform shaping circuit (1]) is caused by the pulse (A). , A/D converted, and the data (c) is sent to computer 0.
The information is processed by 8), outputted to a CRT display (a) and a printer, and displayed. In this example, the display device (7) is a CRT display (
Although c) and printer so are shown as examples, it is also preferable to use other display means.

Figure 4 shows an example of an image obtained from a CRT display (C), with time T plotted on the horizontal axis and transmitted output (G) plotted on the vertical axis. A is the excitation point where the sample (1) is gradually vibrated by the sound wave energy applied to the sample (1), and (A is the aftershock after the jJ oscillation stops, and the amplitude is low. This is an aftershock that is attenuating.

The energy transferability of the sample (1) can be measured based on the value of the gradient (-0) of this excitation rising portion (α).

That is, when the energy transferability of the sample (1) is high, the thermal energy loss when the fundamental burst wave (2) is radiated to the sample (1) and the excitation is started is small, and therefore the forced vibration ( (vibration), and the slope (tanθ) in FIG. 4 becomes large. Conversely, when the energy transferability is small, the gradient becomes small. By analyzing the gradient (tanθ) of the rising portion (α) in this manner, the energy transferability of the sample (1) can be determined.

The present invention effectively achieved the intended purpose with a dual configuration.

In particular, it has become possible to determine energy transferability in a relatively high frequency range exceeding 100 hertz (Hz) without the problem of resonance, easily and with an inexpensive device. Furthermore, the reliability of the measured values is excellent. Furthermore, the present invention has a wide range of applications. For example, when converting from the contact time between the ball and the club when a golf ball is hit with a club, the energy transferability of the golf ball at a frequency of approximately 1 kilohertz (IKH2) has a strong correlation with the coefficient of repulsion during actual hitting. Therefore, the measurement method of the present invention makes it possible to easily determine the restitution coefficient of a golf ball at a frequency around IKHz. Instead of the troublesome and time-consuming measurement method of determining the ball initial velocity and head speed and then calculating the repulsion coefficient, this method can be used to easily and quickly determine the accurate repulsion coefficient, and has many applications. became.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of a circuit used in the measurement method according to the present invention, Fig. 2 is a waveform diagram showing an example of tone burst wave (2), and Fig. 3 is a block diagram showing an example of a tone burst wave (2). A waveform diagram showing an example of the alternating wave (9) detected by the CRT.
FIG. 3 is a diagram showing an example of a display image. (G)...Amplitude, (P)...Peak, (α)...
Excitation rising part, (tanθ)...gradient, (1)...
・Sample, (2)...Tone burst wave, (3)...
Tone burst wave oscillator, (8)...geophone, (9)
... Alternating wave, (11) ... Waveform shaping circuit, 08)
...Computer, 09...DC output, (c)...
・Data, (to)...display device.

Claims (1)

[Claims] / Attach a tone burst wave oscillator (3) to the sample to be measured (1).
) that emits and excites a fundamental burst wave (2) generated from a geophone (8) that contacts a part of the sample (1).
The waveform shaping circuit 0υ detects the alternating wave (9), updates and stores the peak ψ) of the alternating wave (9), and outputs the DC output (II) that matches the amplitude of the alternating wave (9). Then, the DC output θQ is A/D converted, the data Q is processed by the computer 08), and displayed on the display device (7), and the gradient (-〇) of the excitation rising part (α) is An energy transferability measuring method characterized by measuring the energy transferability of a sample (1) based on the value of .