JPS5836085B2 - Method for measuring cocoon ripeness using shock response characteristics - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cocoon ripeness measurement method that focuses on the viscoelastic properties of the cocoon in order to determine the cocoon's boiled state, and performs measurements to instantly obtain the characteristic values. It is.

In the cocoon-cocoon boiling process of general silk mills, there is no detection mechanism to grasp the properties of the given raw material cocoon before boiling, so it is not possible to determine in advance the cocoon-cocooning conditions suitable for the raw material cocoon. However, it is difficult to set a certain condition to boil cocoons, and then reel the silk.Based on the production information expressed by the raw silk yield, production efficiency, raw silk quality, etc., in the cocoon boiling machine Appropriate cocoon boiling conditions are found by a so-called trial and error method of controlling temperature, steam volume, cocoon boiling time, etc.

Since it is not possible to determine the ripeness of cocoons that have been boiled in this manner unless the cocoons are reeled, it takes a considerable amount of time to find the optimal cocoon boiling conditions.

Particularly in cases where parcel cocoons with different properties of original cocoons are boiled in succession, when the production information of a certain parcel cocoon is obtained, it may be necessary to boil a separate parcel cocoon.
In such cases, it has been difficult to find cocoon boiling conditions suitable for the properties of the original cocoon.

Therefore, in the cocoon-cocoon boiling process, in order to quickly determine the cocoon's ripeness, engineers use their years of experience and intuition to intuitively judge the cocoon's hue, hardness and elasticity when compressed with the tips of their fingers. However, there was a desire to develop a method to accurately measure the cocoon's ripening state.

The purpose of the present invention is to provide a method for accurately and quickly obtaining information on the degree of boiling of a cocoon that is easy to handle. Applying an impact force, detecting the damped vibration wave of the cocoon layer generated as a response wave at a certain distance from the point where the impact force was applied, and determining the rise of the waveform of the damped vibration wave, X1, and the logarithmic damping rate δ. , response frequency f, and difference h between the rising level and convergence level of the waveform, etc., to measure and evaluate the boiling state of the cocoon.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a block diagram of an apparatus for implementing a method for measuring cocoon ripeness based on impact response characteristics.

The device shown in the first figure is divided into a part that drives a vibrator for applying a shock wave to the cooked cocoon, and a part that detects, records and displays response waves from the cooked cocoon.

That is, in the former case, a pulse signal is output from a pulse signal generator A, the pulse signal is amplified by an amplifier B, and the electrical pulse signal is converted into mechanical force by a vibrator C, as shown in Fig. 2A. It has a function to record the magnitude of the pulse wave input to the vibrator C with a recorder D.

On the other hand, the latter has a function of detecting the response wave at a fixed interval, for example, 10 mm from the input point of the impact force applied to the cocoon layer, and storing and displaying the waveform.

That is, after the response wave is detected by the detector E, it is amplified by the amplifier F, and the waveform is temporarily stored in the waveform storage device G.

This is because a damped oscillatory wave, which is a response wave, occurs instantaneously, and it is difficult to analyze even if the waveform is drawn directly on an oscilloscope, etc. Therefore, the waveform is stored in the waveform storage device G, and then played back at a slow speed for analysis. This is to make it easier.

The waveform storage device G used in this example samples an analog signal at an arbitrary timing, converts it into an 8-bit digital signal using an A/D converter, and converts it into an 8-bit digital signal.
It is stored in 1024 words of memory.

According to the results of this experiment, it was confirmed that even if the detected waveform is converted into an 8-bit digital signal, it can be reproduced with almost no change to its original form.

In this way, the response wave is stored in the waveform storage device G, and the response wave is accordingly displayed on the screen of the oscilloscope H, and the waveform form is recorded on the recorder (2).

Next, to explain the method for analyzing the response waveform shown in Figure 2, when the response waveform when an impact force is applied to the boiled cocoon is observed using an oscilloscope H or a recorder ■, the response waveform shown in Figure 2 Draw a damped vibration curve like this.

It is known that the form of the damped oscillation curve changes according to a certain tendency when the cocoon's ripening state changes from young to old boiled, so the damped oscillation waveform shown in Figure 2 can be expressed simply Therefore, we devised an evaluation method using the following characteristic values.

That is, ■ the magnitude of the rising amplitude of the waveform x1, ■ the wave I
Logarithmic damping rate δ representing the damping state of the X1 type: M l o g
, -, where n indicates the n-th cycle of the damped vibration curve,
X indicates the amplitude of the n-th cycle.

(2) Frequency f of the waveform; (2) Difference h between the rising level and convergence level of the waveform.

In this way, the characteristic values representing the boiled state of the cocoon are as follows:
As evaluated in (2) above, to briefly summarize the tendency of changes in various characteristic values as the cocoon's boiling state changes, as the cocoon transitions from young to old boiling, the magnitude of the rise in the waveform, X1, increases; The waveform rapidly attenuates, and permanent distortion occurs in the boiled cocoon.

That is, the logarithmic attenuation rate δ increases, and the difference between the rising level and the convergence level of the waveform, h, which indicates the so-called permanent distortion of the boiled cocoon, increases.

On the other hand, the frequency f of the waveform tends to become lower.

In order to examine whether this tendency is the same as that of viscoelastic bodies, which is generally expressed in models, we constructed a differential equation that describes the behavior of a viscoelastic body model and performed a simulation using an electronic computer. The tendency of the response waveform of the viscoelastic body and the results actually measured on boiled cocoons was consistent, supporting the reliability of this measurement method.

Since the characteristic values of the response waveform of the boiled cocoon obtained by this measuring device vary according to a certain tendency, when determining the boiled state, the four characteristics shown in ■ to ■ above are used. The cooked state can be determined by focusing on one of the values and understanding its change, or by comparing and examining the response waveform pattern of the properly cooked state and the measurement results.

In this way, the boiling state of the cocoon, which was conventionally determined by the feeling of compression with the tip of a finger immediately after cocoon boiling, can be grasped as the characteristic value of the response waveform that occurs instantaneously, and the waveform storage device can also be used to store the waveform. However, by replacing it with a microcomputer or the like that can immediately calculate various characteristic values, the response waveform can be analyzed quickly.

In addition, this measuring device can also be applied to determine the cocoon layer structure, such as the hardness of the cocoon layer and the state of relaxation, in order to understand the characteristics of the raw cocoon before boiling.

As described above, according to the method of the present invention, the boiling state of the cocoon can be accurately grasped as a characteristic value after the cocoon is boiled, so it can be a method that provides effective information when constructing an optimal cocoon boiling system using an electronic computer. have an effect.

[Brief explanation of the drawing]

FIG. 1 shows a block diagram of an apparatus for implementing the method of the invention. Figure 2A shows the waveform of the shock wave applied to the cooked cocoon, and Figure 2A shows the damped vibration waveform caused by the shock wave. A... Pulse signal generator, B, F...
Amplifier, C... vibrator, D, I... recorder, E... detector, G... waveform storage device, H... ...Oscilloscope, J...
Boiled cocoon.

Claims (1)

[Claims] 1 Set a boiled cocoon in a fixed position, apply an impact force to one point on its body, and detect the damped vibration wave of the cocoon layer that occurs as a response wave at a certain distance from the point where the impact force was applied,
The boiling state of the cocoon is measured and evaluated based on the characteristic values of the waveform, such as the rise size x1 of the waveform of the damped oscillation wave, the logarithmic damping rate δ, the response frequency f, and the difference h between the rise level and convergence level of the waveform. A method for measuring the degree of boiling of cocoons.