JPH10281709A - Method and device for measuring dynamic strain - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform accurate correction for improved measurement precision based on the temperature characteristics of a dynamic strain sensor. SOLUTION: A low pass filter 5 separates such signal as containing frequency component less than specified frequency from output signal SA of a bridge circuit 1 as temperature change component signal, while a high pass filter 4 separates such signal as containing frequency component equal to or above specified frequency from the output signal SA as dynamic strain component signal. A data processing unit 7 calculates a dynamic strain sensitivity at such temperature as corresponding to the temperature change component signal based on a pre-stored dynamic strain sensitivity, and corrects the dynamic strain amount obtained based on dynamic strain component signal based on the calculated dynamic strain sensitivity, so a high precision dynamic strain measurement is performed with a simple configuration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic strain measuring device and a dynamic strain measuring method, and more particularly to a dynamic strain measuring device and a dynamic strain measuring method for detecting dynamic strain on the surface of a turbine blade of a jet engine in real time. About.

[0002]

2. Description of the Related Art In a dynamic strain measuring device for detecting dynamic strain on the surface of a turbine blade in real time,
A strain gauge sensor is attached to the surface of the turbine blade to detect a change in an electric resistance value (hereinafter simply referred to as a resistance value) of the strain gauge sensor. The resistance value and dynamic strain sensitivity of the strain gauge sensor are within a temperature range to be measured. , The signal processing is performed on the assumption that there is no change due to the temperature change, and the dynamic distortion is calculated.

[0003]

The above-described conventional dynamic strain measuring apparatus performs signal processing on the assumption that the resistance value of the strain gauge sensor used and the dynamic strain sensitivity are constant over a wide temperature range. The resistance value of the strain gauge sensor and the dynamic strain sensitivity change little by little depending on the ambient temperature of the place where the strain gauge sensor is attached, and as a result, there is a problem that the measurement accuracy cannot be increased.

[0004] This is because the temperature of the strain gauge sensor itself cannot be detected, and the temperature characteristics of the dynamic strain sensor cannot be accurately corrected. Accordingly, an object of the present invention is to provide a dynamic strain measuring device and a dynamic strain measuring method capable of performing highly accurate dynamic strain measurement over a wide temperature range.

[0005]

According to the first aspect of the present invention,
In a dynamic strain measurement device including a strain sensor including a strain gauge, an output signal of the strain sensor is applied to a temperature change component signal including a temperature change component due to a temperature change around the strain sensor and the strain sensor. And a signal component separating means for separating a dynamic distortion component signal including a distortion change component caused by the distortion change.

According to the first aspect of the present invention, the signal component separating means applies a temperature change component signal including a temperature change component caused by a temperature change around the strain sensor and an output signal of the strain sensor to the strain sensor. A dynamic distortion component signal including a distortion change component caused by the obtained distortion change is separated.

Accordingly, from the output signal of one strain sensor,
Information on dynamic strain change and temperature change can be obtained. The invention described in claim 2 is claim 1
In the invention described in the first aspect, the signal component separation unit separates a signal having a frequency component less than a predetermined frequency from the output signal of the distortion sensor as the temperature change component signal.
And a second separating unit configured to separate a signal having a frequency component equal to or higher than the predetermined frequency from the output signal as the dynamic distortion component signal.

According to the second aspect of the present invention, in addition to the function of the first aspect, the first separating means of the signal component separating means has a frequency component lower than a predetermined frequency from the output signal of the distortion sensor. The signal is separated as a temperature change component signal. The second separating unit separates a signal having a frequency component equal to or higher than a predetermined frequency from the output signal as a dynamic distortion component signal.

According to a third aspect of the present invention, in the second aspect of the present invention, the first separating means is a low-pass filter that passes only a frequency component lower than the predetermined frequency, and the second separating means is The high-pass filter is configured to pass only the frequency components equal to or higher than the predetermined frequency.

According to the third aspect of the present invention, in addition to the function of the second aspect of the invention, the low-pass filter functioning as the first separating means allows only the frequency component lower than the predetermined frequency to pass, and The high-pass filter functioning as a separating unit passes only frequency components equal to or higher than a predetermined frequency.

According to a fourth aspect of the present invention, in the second or third aspect, the predetermined frequency is set to 5 [H].
z]. According to the invention described in claim 4, in addition to the effect of the invention described in claim 2 or 3, the predetermined frequency is set to a frequency of 5 [Hz] or less, so that information on dynamic strain change and temperature change are obtained. Information can be easily separated.

According to a fifth aspect of the present invention, in accordance with the first aspect of the present invention, there is provided a storage means for storing dynamic strain sensitivity as a function of temperature in advance, and a storage means for storing the temperature change component signal. Dynamic strain calculating means for calculating the dynamic strain sensitivity at a temperature corresponding to the temperature to be stored, based on the dynamic strain sensitivity stored in the storage means, and calculating the dynamic strain amount obtained based on the dynamic strain component signal. Dynamic distortion amount correction means for performing correction based on the sensitivity and calculating the corrected dynamic distortion amount.

According to the fifth aspect of the present invention, in addition to the operation of the first aspect, the dynamic distortion calculating means corresponds to the temperature corresponding to the temperature change component signal. The dynamic strain sensitivity at the temperature is calculated based on the dynamic strain sensitivity stored in the storage means, and the dynamic strain amount correction means corrects the dynamic strain amount obtained based on the dynamic strain component signal based on the calculated dynamic strain sensitivity. , The amount of corrected dynamic distortion is calculated.

According to a sixth aspect of the present invention, in the dynamic strain measuring apparatus provided with a strain sensor including a strain gauge, a temperature change component caused by a temperature change around the strain sensor is included in an output signal of the strain sensor. Signal component separating means for separating a dynamic distortion component signal including a temperature variation component signal and a distortion variation component caused by a distortion variation applied to the strain sensor; and a ratio of the dynamic distortion component signal to the temperature variation component signal. And a dynamic strain / temperature ratio signal generating means for generating a dynamic strain / temperature ratio signal.

According to the sixth aspect of the present invention, the signal component separating means applies a temperature change component signal including a temperature change component due to a temperature change around the strain sensor and an output signal from the strain sensor to the strain sensor. A dynamic distortion component signal including a distortion change component caused by the obtained distortion change is separated.

The dynamic strain / temperature ratio signal generation means determines the ratio between the dynamic strain component signal and the temperature change component signal, and generates a dynamic strain / temperature ratio signal. According to a seventh aspect of the present invention, in the sixth aspect of the invention, the signal component separating means separates a signal having a frequency component lower than a predetermined frequency from the output signal of the distortion sensor as the temperature change component signal. And a second separating unit configured to separate a signal having a frequency component equal to or higher than the predetermined frequency from the output signal as the dynamic distortion component signal.

According to the seventh aspect of the invention, in addition to the function of the sixth aspect, the first separating means of the signal component separating means has a frequency component lower than a predetermined frequency from the output signal of the distortion sensor. The signal is separated as a temperature change component signal, and the second separating unit separates a signal having a frequency component equal to or higher than a predetermined frequency from the output signal as a dynamic distortion component signal.

According to an eighth aspect of the present invention, in the invention of the seventh aspect, the first separating means is a low-pass filter that passes only a frequency component less than the predetermined frequency, and the second separating means is The high-pass filter is configured to pass only the frequency components equal to or higher than the predetermined frequency.

According to the invention of claim 8, in addition to the effect of the invention of claim 7, the low-pass filter functioning as the first separating means passes only the frequency components lower than the predetermined frequency, and The high-pass filter functioning as a separating unit passes only frequency components equal to or higher than a predetermined frequency.

According to a ninth aspect of the present invention, the predetermined frequency is set to 5 [H].
z]. According to the ninth aspect of the invention, in addition to the operation of the seventh or eighth aspect, the predetermined frequency is set to a frequency of 5 [Hz] or less. Information can be easily separated.

According to a tenth aspect of the present invention, in accordance with any one of the sixth to ninth aspects, a storage means for storing in advance a dynamic strain sensitivity as a function of temperature, and A dynamic strain calculating means for calculating the dynamic strain sensitivity at a temperature corresponding to the temperature to be stored based on the dynamic strain sensitivity stored in the storage means, and a dynamic strain amount obtained based on the dynamic strain / temperature ratio signal. Dynamic distortion amount correction means for performing correction based on the dynamic distortion sensitivity and calculating a corrected dynamic distortion amount.

According to the tenth aspect, the sixth aspect is provided.
In addition to the effects of the invention described in any one of claims 9 to 9,
The dynamic strain calculating means calculates the dynamic strain sensitivity at a temperature corresponding to the temperature corresponding to the temperature change component signal based on the dynamic strain sensitivity stored in the storage means.

The dynamic distortion correcting means corrects the dynamic distortion obtained based on the dynamic distortion / temperature ratio signal based on the calculated dynamic distortion sensitivity, and calculates the corrected dynamic distortion. According to an eleventh aspect of the present invention, in the dynamic strain measuring device provided with a strain sensor including a strain gauge, a temperature change component caused by a temperature change around the strain sensor and applied to the strain sensor from an output of the strain sensor. And a signal component separation step of separating a distortion change component caused by the obtained distortion change.

According to the eleventh aspect of the present invention, the signal component separating step is based on a temperature change component caused by a temperature change around the strain sensor and a strain change applied to the strain sensor from the output of the strain sensor. Separate the distortion change component. According to a twelfth aspect of the present invention, in the invention according to the eleventh aspect, the signal component separating step includes: a first separating step of separating a frequency component lower than a predetermined frequency from the output as the temperature change component; And a second separation step of separating a frequency component equal to or higher than a predetermined frequency as the dynamic distortion component.

According to the twelfth aspect, the first aspect
In addition to the effect of the invention described in item 1, the first of the signal component separation steps
The separation step separates a frequency component lower than a predetermined frequency from the output as a temperature change component, and the second separation step separates a frequency component higher than a predetermined frequency from the output as a dynamic distortion component.

According to a thirteenth aspect, in the eleventh or twelfth aspect, the predetermined frequency is set to a frequency of 5 [Hz] or less. According to the invention of claim 13, claim 11 or claim 12 is provided.
In addition to the operation of the invention described in the above, the predetermined frequency is set to 5 [Hz].
Since the following frequencies are used, the information on the dynamic strain change and the information on the temperature change can be easily separated.

[0027] According to a fourteenth aspect of the present invention, in accordance with any one of the eleventh to thirteenth aspects, the dynamic strain sensitivity at a temperature corresponding to the temperature change component is calculated based on a previously stored dynamic strain sensitivity. Dynamic distortion calculation step, and a dynamic distortion amount correction step of correcting the dynamic distortion amount obtained based on the dynamic distortion component based on the calculated dynamic distortion sensitivity,
It comprises.

According to the fourteenth aspect of the present invention, a first aspect is provided.
In addition to the effect of the invention according to any one of claims 1 to 13, the dynamic strain calculating step calculates the dynamic strain sensitivity at a temperature corresponding to the temperature change component based on the dynamic strain sensitivity stored in advance. In the amount correction step, the amount of dynamic distortion obtained based on the dynamic distortion component is corrected based on the calculated dynamic distortion sensitivity.

According to a fifteenth aspect of the present invention, in the dynamic strain measuring device provided with a strain sensor including a strain gauge, a temperature change component caused by a temperature change around the strain sensor and the strain are calculated from an output of the strain sensor. A signal component separating step of separating a strain change component caused by a strain change applied to the sensor; and a dynamic strain / temperature ratio for obtaining a ratio of the dynamic strain component and the temperature change component to generate a dynamic strain / temperature ratio. And an operation step.

According to the fifteenth aspect of the present invention, the signal component separating step is based on a temperature change component caused by a temperature change around the strain sensor and a strain change applied to the strain sensor from the output of the strain sensor. Separate distortion change components.
In the dynamic strain / temperature ratio calculation step, a ratio between a dynamic strain component and a temperature change component is obtained to generate a dynamic strain / temperature ratio.

According to a sixteenth aspect, in the fifteenth aspect, the signal component separating step includes a first separating step of separating a frequency component lower than a predetermined frequency from the output as the temperature change component. A second separating step of separating a frequency component equal to or higher than the predetermined frequency from the output as the dynamic distortion component.

According to the sixteenth aspect of the present invention, the first aspect
In addition to the operation of the invention described in the fifth aspect, the first of the signal component separation steps
The separation step separates a frequency component lower than a predetermined frequency from the output as a temperature change component, and the second separation step separates a frequency component higher than a predetermined frequency from the output as a dynamic distortion component.

According to a seventeenth aspect of the present invention, in the first or the second aspect of the invention, the predetermined frequency is set to a frequency of 5 [Hz] or less. According to the invention of claim 17, claim 15 or claim 16 is provided.
In addition to the operation of the invention described in the above, the predetermined frequency is set to 5 [Hz].
Since the following frequencies are used, the information on the dynamic strain change and the information on the temperature change can be easily separated.

The invention according to claim 18 is the invention according to any one of claims 15 to 17, wherein the dynamic strain sensitivity at a temperature corresponding to the temperature corresponding to the temperature change component signal is stored in advance. A dynamic strain calculating step of calculating based on the sensitivity; and a dynamic strain amount correcting step of correcting a dynamic strain amount obtained based on the dynamic strain / temperature ratio based on the calculated dynamic strain sensitivity. .

According to the eighteenth aspect of the present invention, the first aspect is provided.
In addition to the effect of the invention according to any one of claims 5 to 17, the dynamic strain calculation step is based on the dynamic strain sensitivity in which the dynamic strain sensitivity at the temperature corresponding to the temperature corresponding to the temperature change component signal is stored in advance. The calculated dynamic strain correction step corrects the dynamic strain obtained based on the dynamic strain / temperature ratio based on the calculated dynamic strain sensitivity.

[0036]

Preferred embodiments of the present invention will now be described with reference to the drawings. First Embodiment FIG. 1 shows a schematic configuration block diagram of a dynamic strain measuring device according to a first embodiment.

The dynamic distortion measuring apparatus 100 is roughly divided into a bridge circuit 1 for measuring a dynamic distortion and outputting a detection signal S as a differential signal, and a constant voltage power supply 2 for applying a constant voltage to the bridge circuit 1. , One input terminal is the first input terminal of the bridge circuit 1.
An amplifier 3 connected to the output terminal TO1 and the other input terminal connected to the second output terminal TO2 of the bridge circuit for amplifying the detection signal S output from the bridge circuit 1 and outputting the amplified signal as an amplified detection signal SA; A high-pass filter (HPF) 4 which passes a high-frequency signal component (cut-off frequency = 5 [Hz] in the embodiment) of the signal SA and outputs it to a data processing unit 7 described later as a dynamic distortion detection signal SS;
In the amplified detection signal SA, a low-frequency signal component (in the embodiment, a cutoff frequency = 5 [Hz] is passed and the temperature detection signal S
A low-pass filter 5 that outputs T, a balance adjuster 6 that generates a balance adjustment temperature detection signal SBT for the bridge circuit 1 based on the temperature detection signal ST, and outputs the signal to the bridge circuit 1 and a data processing unit 7 described below; The dynamic strain sensitivity is collected and stored in advance, and the dynamic strain sensitivity at the temperature corresponding to the balance adjustment temperature detection signal SBT is calculated based on the stored dynamic strain sensitivity, and the dynamic strain detection signal SS is calculated.
And a data processing unit 7 that calculates corrected dynamic distortion data DCS by correcting

The bridge circuit 1 has a high potential side input terminal TH.
One end is connected to the first output terminal TO1, the other end is connected to the first output terminal TO1, the balance adjustment temperature detection signal SBT is input to the gate terminal of the balance adjustment FET Q1, and one end is connected to the low potential side input terminal TL. A strain gauge sensor 10 having the other end connected to one output terminal TO1, and a high potential side input terminal TH
A first resistor R1 having one end connected to the second output terminal TO2 and a second resistor having one end connected to the low potential side input terminal TL and the other end connected to the second output terminal TO2. Resistance R
2 is provided.

In this case, the cut-off frequency of the high-pass filter 4 and the low-pass filter 5 is set to 5 [Hz].
The reason is that the resistance value change of the strain gauge sensor 10 due to the temperature change has a frequency of about 0 to 5 [Hz], and rarely changes at a frequency higher than 5 [Hz]. On the other hand, the gauge sensor 10 caused by dynamic strain
Is rarely changed at a low frequency of less than 5 Hz. Therefore, the cutoff frequency can be changed as needed. For example, in a measured system in which the cycle of the temperature change is about 10 [Hz], if it is desired to detect dynamic strain having a cycle of [10 [Hz] or more, the cutoff frequency is set to 1
It can be set to 0 [Hz].

FIG. 2 shows a schematic block diagram of the data processing unit 7. The data processing unit 7 converts the voltage-converted dynamic distortion detection signal SS into a converted dynamic distortion detection signal SSV.
An A / D converter 15 that performs analog / digital conversion of a converted balance adjusted temperature detection signal SBTV, which is a voltage-adjusted balance adjusted temperature detection signal SBT, and outputs dynamic strain detection data DS and temperature detection data DT; D
The interface operation between the converter 15 and the high-pass filter 4 is performed, and the input dynamic distortion detection signal SS is converted to A /
Interface section 16 which outputs as conversion dynamic distortion detection signal SSV having a voltage range that can be input to D converter 15
Performs an interface operation between the A / D converter 15 and the balance adjuster 6 and converts the input balance adjustment temperature detection signal SBT into a conversion balance adjustment temperature having a voltage range capable of being input to the A / D converter 15. It has an interface unit 17 that outputs a detection signal SBTV, and has an arithmetic function, a storage function, and a monitor display function, and performs correction based on dynamic strain detection data DS, temperature detection data DT, and the relationship between temperature and dynamic strain sensitivity stored in advance. And an operation display section 18 for outputting the dynamic strain data DCS.

Next, the operation will be described with reference to FIGS. The bridge circuit 1 measures a dynamic distortion and outputs a detection signal S, which is a differential signal, to the amplifier 3 while a constant voltage is applied from the constant voltage power supply 2. In parallel with this, a balance adjustment temperature detection signal SBT is input to the gate terminal of the FET Q1 of the bridge circuit 1 by the balance adjuster 6,
In order to correct the temperature characteristics of the strain gauge sensor 10, the balance of the bridge circuit 1 is adjusted by adjusting the average voltage of both ends of the strain gauge sensor 10 to be substantially constant, that is, the strain gauge sensor 10 detects the strain. Otherwise, the output voltage of the detection signal S, which is a differential signal, is zero.
The adjustment is constantly performed so as to be [V].

The amplifier 3 amplifies the detection signal S output from the bridge circuit 1 and outputs the amplified signal to the high-pass filter 4 and the low-pass filter 5 as an amplified detection signal SA. The high-pass filter 4 passes a high-frequency signal component of the amplified detection signal SA, that is, a signal component having a frequency of 5 [Hz] or more, and passes the data processing unit 7 as a dynamic distortion detection signal SS.
Output to

On the other hand, the low-pass filter 5 outputs a low-frequency signal component of the amplified detection signal SA, that is, a frequency of 5 [H].
z] is passed through and output to the balance adjuster 6 as a temperature detection signal ST. The balance adjuster 6 generates a balance adjustment temperature detection signal SBT of the bridge circuit 1 based on the temperature detection signal ST,
Output to the gate terminal of Q1 and the data processing unit 7.

The interface unit 16 of the data processing unit 7 converts the input dynamic distortion detection signal SS into the A / D converter 15 as a converted dynamic distortion detection signal SSV having a voltage range that can be input to the A / D converter 15. Output. At the same time, the interface unit 17 outputs the input balance adjustment temperature detection signal SBT to the A / D converter 15 as a conversion balance adjustment temperature detection signal SBTV having a voltage range that can be input to the A / D converter 15.

The A / D converter 15 is an analog of the converted dynamic distortion detection signal SSV, which is a voltage-converted dynamic distortion detection signal SS, and the converted balance adjustment temperature detection signal SBTV, which is a voltage-converted balance adjustment temperature detection signal SBT. / Digital conversion and dynamic strain detection data DS and temperature detection data DT
Is output to the calculation display unit 18.

Next, the operation of the operation display section 18 will be described. In this case, the detected temperature T and the dynamic strain sensitivity A
Is stored in the calculation display unit 18 in advance. Here, the dynamic strain sensitivity A is a temperature correction coefficient for temperature-correcting the obtained dynamic strain X to obtain a true dynamic strain Z, and has, for example, a relationship of Z = A · X.

Specifically, the temperatures T1, T2, T3, T
4, the dynamic strain sensitivities A1, A2, A3, A4,
.. Have a relationship as shown in FIG. FIG. 4 shows an example of an operation processing flowchart of the operation display unit 18. The calculation display unit 18 converts the temperature detection data DT into an A / D
It is input from the converter 15 (step S1), and the dynamic distortion detection data DS is input from the A / D converter 15 (step S1).
2).

Next, the operation display section 18 displays the temperature detection data D
The dynamic strain sensitivity A at the temperature T corresponding to T is searched. If the corresponding dynamic strain sensitivity A is stored, the dynamic strain sensitivity A is used as it is. If the corresponding dynamic strain sensitivity A is not stored, the dynamic strain sensitivity A is searched. The sensitivity A is calculated (Step S3).

More specifically, when the temperature T matches any of the stored temperatures T1, T2, T3, T4,..., The corresponding dynamic strain sensitivities A1, A2, A3,.
Any of A4,... Is adopted as the dynamic distortion sensitivity A as it is. If the corresponding dynamic strain sensitivity A is not stored, the dynamic strain sensitivity A is calculated by interpolating or extrapolating the dynamic strain sensitivity A. More specifically, the temperature T
When the relationship between the temperature T and the dynamic strain sensitivity A can be approximated by a linear function, when the temperature T is higher than the temperature T1 in which the dynamic strain sensitivity is stored in advance and is lower than the temperature T2, FIG.
As shown in (b), the required dynamic strain sensitivity A should exist between the dynamic strain sensitivity A1 corresponding to the temperature T1 and the dynamic strain sensitivity A2 corresponding to the temperature T2.

Therefore, it is possible to calculate the dynamic distortion sensitivity A by performing the interpolation. More specifically, in the case of the above example, as shown in FIG. 3B, the dynamic distortion sensitivity A can be calculated by the following equation. A = (T · (A2−A1)) / (T2−T1) Next, the arithmetic display unit 18 calculates the true dynamic distortion amount Z based on the dynamic distortion detection data DS and the retrieved or calculated dynamic distortion sensitivity A.
Is estimated (step S4).

More specifically, if the dynamic distortion amount corresponding to the dynamic distortion detection data DS is X, then Z = A
-The value calculated by X is used as the estimated value. Then, the calculation display unit 18 displays the estimated value of the true dynamic distortion amount Z on a monitor (not shown) and outputs it as corrected dynamic distortion data DSC (step S5).

Next, the calculation display section 18 determines whether or not the measurement is to be continued (step S6), and when the measurement is completed (step S6; No), the processing is terminated. In the determination of step S6, when the measurement is to be continued (step S6; Ye
s), the process proceeds to step S1, and
Steps S6 to S6 are repeated.

As described above, according to the first embodiment, a signal component caused by a change in dynamic distortion and a signal component caused by a temperature change can be easily separated from an output signal of one bridge circuit. By correcting the amount of dynamic strain determined from the signal component caused by the change in dynamic strain with the temperature determined from the signal component caused by the change in temperature, the amount of vibration and dynamic strain can be estimated. Accurate dynamic strain measurement can be performed. Second Embodiment FIG. 5 shows a schematic block diagram of a dynamic strain measuring apparatus according to a second embodiment.

The dynamic strain measuring device 200 is roughly classified into a strain gauge sensor 21 for measuring a dynamic strain and outputting a detection signal S1, and a constant current for flowing a constant current through the strain gauge sensor 21 (biasing with a constant current). A power supply 22 and an input terminal are connected to an intermediate connection point between the strain gauge sensor 21 and the constant current source 22, and the detection signal S output from the strain gauge sensor 21
An amplifier 23 that amplifies 1 and outputs it as an amplified detection signal S1A, and a high-frequency signal component (cutoff frequency = 5 [Hz] in the embodiment) of the amplified detection signal S1A is passed and a dynamic distortion detection signal S1S is described later. A high-pass filter (HPF) 24 to be output to a divider 26;
1A, a low-pass filter component 25 that passes a low-frequency signal component (cutoff frequency = 5 [Hz] in the embodiment and outputs a temperature detection signal S1T to a divider 26 and a data processing unit 27 to be described later); A divider 2 that generates a division result signal SDV based on the signal S1S and the temperature detection signal S1T, and outputs the signal to the data processing unit 27 described later.
6, the dynamic strain sensitivity is collected and stored in advance, the dynamic strain sensitivity at the temperature corresponding to the temperature detection signal S1T is calculated, and the division result signal S is calculated based on the stored dynamic strain sensitivity.
Dynamic distortion detection signal S1S and temperature detection signal S1T corresponding to DV
, That is, a data processing unit 27 that calculates a corrected dynamic strain data D1CS by correcting a corrected dynamic strain detection signal obtained by correcting a change in bias voltage due to a temperature of the strain gauge sensor 21.

In this case, the data processing unit 2
7 has substantially the same configuration as the data processing unit 7 of the first embodiment. Next, the operation will be described. The strain gauge sensor 21 measures dynamic strain and outputs a detection signal S1 to the amplifier 23 in a state where a constant current is supplied from the constant current power supply 22.

The amplifier 23 amplifies the detection signal S1 output from the strain gauge sensor 21 and outputs the amplified signal to the high-pass filter 24 and the low-pass filter 25 as an amplified detection signal S1A. The high-pass filter 24 outputs the amplified detection signal S1
High-frequency signal component of A, that is, frequency = 5 [Hz]
The above signal components are passed and output to the divider 26 as a dynamic distortion detection signal S1S.

On the other hand, the low-pass filter 5 outputs a low-frequency signal component of the amplified detection signal S1A, that is, a frequency of 5 [H].
z], and passes the signal component to the divider 26 and the data processing unit 27 as a temperature detection signal S1T.
The divider 26 generates a division result signal SDV based on the dynamic distortion detection signal S1S and the temperature detection signal S1T by the following equation, and outputs the signal to the data processing unit 27 described later.

SDV = S1S / S1T The data processing unit 27 receives the divided result signal S
A / D conversion of DV and A / D conversion of the input temperature detection signal S1T are performed. The arithmetic display unit (not shown) of the data processing unit 27 displays the division result signal S based on the relationship between the detected temperature T and the dynamic distortion sensitivity A stored in advance.
DV is handled in the same manner as the dynamic distortion detection data DS in the first embodiment, the true dynamic distortion amount is estimated, and the true dynamic distortion amount Z is estimated.
Is displayed on a monitor (not shown) and output as corrected dynamic distortion data D1CS.

Next, an arithmetic display unit (not shown) determines whether or not to continue the measurement, and thereafter performs the same processing as in the first embodiment. As described above, according to the second embodiment, a signal component caused by a change in dynamic strain and a signal component caused by a temperature change can be easily separated from an output signal of one strain gauge sensor. With a simple configuration, the amount of vibration and dynamic distortion can be estimated by correcting the amount of dynamic distortion obtained from the signal component caused by the change in dynamic distortion with the temperature determined from the signal component caused by the change in temperature. Accurate dynamic strain measurement can be performed.

[0060]

According to the first aspect of the present invention, the signal component separating means converts the output signal of the strain sensor into a temperature change component signal including a temperature change component caused by a temperature change around the strain sensor and the strain sensor. A dynamic strain component signal including a strain change component caused by a strain change applied to the sensor is separated, and a dynamic strain component signal that is information about a dynamic strain change and a temperature change that is information about a temperature change from an output signal of one strain sensor. Since the component signal can be obtained, highly accurate dynamic strain measurement can be performed by correcting the dynamic strain component signal based on the temperature change component signal.

According to the second aspect of the invention, in addition to the effect of the first aspect, the first separating means of the signal component separating means has a frequency component lower than a predetermined frequency from the output signal of the distortion sensor. The signal is separated as a temperature change component signal, and the second separation unit separates a signal having a frequency component equal to or higher than a predetermined frequency from the output signal as a dynamic distortion component signal. The signals can be easily separated, no extra measurement error occurs, and more accurate dynamic strain measurement can be performed.

According to the third aspect of the present invention, in addition to the effect of the second aspect of the invention, the low-pass filter functioning as the first separating means allows only the frequency components lower than the predetermined frequency to pass, and The high-pass filter that functions as the separating means passes only the frequency components equal to or higher than the predetermined frequency, so that the temperature change component signal and the dynamic distortion component signal can be reliably separated with a simple configuration, and thus, highly accurate dynamic distortion measurement can be performed. I can do it.

According to the invention of claim 4, in addition to the effect of the invention of claim 2 or 3, the predetermined frequency is set to a frequency of 5 [Hz] or less. Information on temperature changes can be easily separated,
Accurate dynamic strain measurement can be performed. According to the fifth aspect of the present invention, in addition to the effects of the first aspect, the dynamic strain calculating means may include a dynamic strain at a temperature corresponding to the temperature corresponding to the temperature change component signal. The distortion sensitivity is calculated based on the dynamic distortion sensitivity stored in the storage means, and the dynamic distortion amount correction means corrects the dynamic distortion amount obtained based on the dynamic distortion component signal based on the calculated dynamic distortion sensitivity, and corrects the correction sensitivity. Since the amount of strain is calculated, highly accurate dynamic strain measurement can be performed.

According to the sixth aspect of the present invention, the signal component separating means applies, from the output signal of the strain sensor, a temperature change component signal including a temperature change component caused by a temperature change around the strain sensor and the signal to the strain sensor. The dynamic distortion component signal including the distortion change component caused by the distortion change is separated, and the dynamic distortion /
The temperature ratio signal generation means obtains a ratio between the dynamic strain component signal and the temperature change component signal and generates a dynamic strain / temperature ratio signal. Therefore, the dynamic strain / temperature ratio signal is a bias voltage of the bias voltage applied to the strain sensor. Since information on dynamic strain is included without being affected by the change, highly accurate dynamic strain measurement can be performed with a simple configuration.

According to the invention of claim 7, in addition to the effect of the invention of claim 6, the first separating means of the signal component separating means has a frequency component lower than a predetermined frequency from the output signal of the distortion sensor. The signal is separated as a temperature change component signal, and the second separation unit separates a signal having a frequency component equal to or higher than a predetermined frequency from the output signal as a dynamic distortion component signal. The signals can be easily separated, no extra measurement error occurs, and more accurate dynamic strain measurement can be performed.

According to the invention described in claim 8, in addition to the effect of the invention described in claim 7, the low-pass filter functioning as the first separating means allows only the frequency component lower than the predetermined frequency to pass, and The high-pass filter that functions as the separating means passes only the frequency components equal to or higher than the predetermined frequency, so that the temperature change component signal and the dynamic distortion component signal can be reliably separated with a simple configuration, and thus, highly accurate dynamic distortion measurement can be performed. I can do it.

According to the ninth aspect of the present invention, in addition to the effect of the seventh or eighth aspect, the predetermined frequency is set to a frequency of 5 [Hz] or less. Information on temperature changes can be easily separated,
Accurate dynamic strain measurement can be performed. According to the tenth aspect, in addition to the effect of the sixth aspect, the dynamic strain calculating means may determine whether the dynamic strain is at a temperature corresponding to the temperature corresponding to the temperature change component signal. The dynamic strain sensitivity is calculated based on the dynamic strain sensitivity stored in the storage means, and the dynamic strain amount correction means corrects the dynamic strain amount obtained based on the dynamic strain / temperature ratio signal based on the calculated dynamic strain sensitivity. Since the corrected dynamic distortion amount is calculated, highly accurate dynamic distortion measurement can be performed.

According to the eleventh aspect of the present invention, the signal component separating step is based on a temperature change component caused by a temperature change around the strain sensor and a strain change applied to the strain sensor from the output of the strain sensor. Since the strain change component is separated, a dynamic strain component signal that is information about dynamic strain change and a temperature change component signal that is information about temperature change can be obtained from the output signal of one strain sensor.
By correcting the dynamic strain component signal based on the temperature change component signal, highly accurate dynamic strain measurement can be performed. According to the twelfth aspect of the present invention, in addition to the effect of the eleventh aspect, in the first separating step of the signal component separating step, a frequency component lower than a predetermined frequency is separated from the output as a temperature change component. In the 2 separation process, since a frequency component higher than a predetermined frequency is separated from the output as a dynamic distortion component, a temperature change component signal and a dynamic distortion component signal can be easily separated with a simple configuration, and no extra measurement error occurs. More accurate dynamic strain measurement can be performed.

According to the thirteenth aspect of the present invention, the first aspect
In addition to the effect of the first or twelfth aspect, the predetermined frequency is set to a frequency of 5 [Hz] or less, so that information on dynamic strain change and information on temperature change can be easily separated, and accurate dynamic strain measurement can be performed. Can be performed.

According to the invention of claim 14, claim 1 is
In addition to the effect of the invention according to any one of claims 1 to 13, the dynamic strain calculating step calculates the dynamic strain sensitivity at the temperature corresponding to the temperature change component based on the dynamic strain sensitivity stored in advance. In the amount correction step, the dynamic distortion amount obtained based on the dynamic distortion component is corrected based on the calculated dynamic distortion sensitivity, so that highly accurate dynamic distortion measurement can be performed.

According to the fifteenth aspect of the present invention, the signal component separating step is based on a temperature change component caused by a temperature change around the strain sensor and a strain change applied to the strain sensor from the output of the strain sensor. In the dynamic strain / temperature ratio calculation step, the ratio between the dynamic strain component and the temperature change component is determined to generate the dynamic strain / temperature ratio.
The temperature ratio includes information on dynamic strain without being affected by a change in the bias voltage applied to the strain sensor, and high-precision dynamic strain measurement can be performed with a simple configuration.

According to the invention of claim 16, claim 1 is
In addition to the effects of the invention described in 5, the first of the signal component separation steps
The separation step separates a frequency component lower than a predetermined frequency from the output as a temperature change component, and the second separation step separates a frequency component higher than a predetermined frequency from the output as a dynamic distortion component. The signal and the dynamic distortion component signal can be easily separated, and no extraordinary measurement error occurs, and more accurate dynamic distortion measurement can be performed.

According to the seventeenth aspect of the present invention, the first aspect
In addition to the effect of the fifth aspect or the invention according to the sixteenth aspect, since the predetermined frequency is set to a frequency of 5 [Hz] or less, information on dynamic strain change and information on temperature change can be easily separated, and accurate dynamic strain measurement can be performed. Can be performed.

According to the eighteenth aspect, according to the first aspect,
In addition to the effects of the fifth to seventeenth aspects, in the dynamic distortion calculating step, the dynamic distortion sensitivity at the temperature corresponding to the temperature corresponding to the temperature change component signal is based on the dynamic distortion sensitivity stored in advance. The dynamic strain / temperature ratio correction step corrects the dynamic strain amount obtained based on the dynamic strain / temperature ratio based on the calculated dynamic strain sensitivity. Therefore, the dynamic strain / temperature ratio is determined by the bias applied to the strain sensor. Since information on dynamic strain is included without being affected by a change in voltage, high-precision dynamic strain measurement can be performed with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a schematic configuration block diagram of a dynamic strain measurement device according to a first embodiment.

FIG. 2 is a schematic configuration block diagram of a data processing unit according to the first embodiment.

FIG. 3 is an explanatory diagram of a correction process according to the first embodiment.

FIG. 4 is an operation processing flowchart of the first embodiment.

FIG. 5 is a schematic configuration block diagram of a dynamic strain measurement device according to a second embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Dynamic strain measuring device 200 Dynamic strain measuring device 1 Bridge circuit 2 Constant voltage power supply 3 Amplifier 4 High pass filter (HPF) 5 Low pass filter (LPF) 6 Balance adjuster 7 Data processing unit 10 Strain gauge sensor 15 A / D converter Reference Signs List 16 interface section 17 interface section 18 operation display section 21 strain gauge sensor 22 constant current power supply 23 amplifier 24 high-pass filter (HPF) 25 low-pass filter (LPF) 26 divider 27 data processing unit S detection signal SA amplification detection signal SS operation Distortion detection signal ST Temperature detection signal SBT Balance adjustment temperature detection signal DSC Correction dynamic distortion detection data

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI G01L 1/00 G01D 3/04 D

Claims (18)

[Claims] 1. A dynamic strain measurement device provided with a strain sensor including a strain gauge, wherein a temperature change component signal including a temperature change component caused by a temperature change around the strain sensor is obtained from an output signal of the strain sensor. A dynamic distortion measuring device comprising: a signal component separating unit that separates a dynamic distortion component signal including a distortion change component caused by a distortion change applied to a distortion sensor. 2. The dynamic strain measuring apparatus according to claim 1, wherein the signal component separating unit separates a signal having a frequency component lower than a predetermined frequency from the output signal of the strain sensor as the temperature change component signal. A dynamic distortion measuring device, comprising: a separating unit; and a second separating unit configured to separate a signal having a frequency component equal to or higher than the predetermined frequency from the output signal as the dynamic distortion component signal. 3. The dynamic distortion measuring device according to claim 2, wherein the first separating unit is a low-pass filter that passes only a frequency component less than the predetermined frequency, and the second separating unit is a low-pass filter. A dynamic distortion measuring device, which is a high-pass filter that passes only the above frequency components. 4. The dynamic strain measuring device according to claim 2, wherein the predetermined frequency is a frequency of 5 [Hz] or less. 5. The dynamic strain measuring apparatus according to claim 1, wherein said dynamic strain sensitivity is a function of a temperature, and said dynamic strain sensitivity is stored in advance. A dynamic strain calculating means for calculating a dynamic strain sensitivity at a corresponding temperature based on the dynamic strain sensitivity stored in the storage means, and a dynamic strain amount obtained based on the dynamic strain component signal based on the calculated dynamic strain sensitivity. And a dynamic distortion amount correcting means for calculating a corrected dynamic distortion amount. 6. A dynamic strain measurement device provided with a strain sensor including a strain gauge, wherein a temperature change component signal including a temperature change component caused by a temperature change around the strain sensor is obtained from an output signal of the strain sensor. A signal component separation unit for separating a dynamic distortion component signal including a distortion change component caused by a distortion change applied to the distortion sensor; and determining a ratio between the dynamic distortion component signal and the temperature change component signal to obtain a dynamic distortion / temperature. A dynamic strain / temperature ratio signal generating means for generating a ratio signal; 7. The dynamic strain measuring device according to claim 6, wherein the signal component separating unit separates a signal having a frequency component lower than a predetermined frequency from the output signal of the strain sensor as the temperature change component signal. A dynamic distortion measuring device, comprising: a separating unit; and a second separating unit configured to separate a signal having a frequency component equal to or higher than the predetermined frequency from the output signal as the dynamic distortion component signal. 8. The dynamic distortion measuring device according to claim 7, wherein the first separating unit is a low-pass filter that passes only a frequency component less than the predetermined frequency, and the second separating unit is a low-pass filter. A dynamic distortion measuring device, which is a high-pass filter that passes only the above frequency components. 9. The dynamic strain measuring device according to claim 7, wherein the predetermined frequency is a frequency of 5 [Hz] or less. 10. The dynamic strain measuring device according to claim 6, wherein a storage means for previously storing a dynamic strain sensitivity which is a function of a temperature, and a temperature corresponding to the temperature change component signal. Dynamic strain calculating means for calculating dynamic strain sensitivity at a corresponding temperature based on the dynamic strain sensitivity stored in the storage means; and dynamic strain sensitivity obtained based on the dynamic strain amount obtained based on the dynamic strain / temperature ratio signal. A dynamic distortion amount corrector that corrects based on the equation (1) and calculates a corrected dynamic distortion amount. 11. A dynamic strain measuring method for a dynamic strain measuring apparatus including a strain sensor including a strain gauge, wherein a temperature change component caused by a temperature change around the strain sensor and an output of the strain sensor and the strain sensor And a signal component separating step of separating a strain change component caused by a strain change applied to the dynamic strain measurement. 12. The dynamic distortion measuring method according to claim 11, wherein the signal component separating step includes: a first separating step of separating a frequency component lower than a predetermined frequency from the output as the temperature change component; A second separating step of separating a frequency component equal to or higher than a predetermined frequency as the dynamic distortion component. 13. The dynamic strain measurement method according to claim 11, wherein the predetermined frequency is a frequency of 5 [Hz] or less. 14. The dynamic strain measurement method according to claim 11, wherein the dynamic strain sensitivity at a temperature corresponding to the temperature change component is calculated based on a previously stored dynamic strain sensitivity. A dynamic distortion measurement method, comprising: a calculating step; and a dynamic distortion amount correcting step of correcting a dynamic distortion amount obtained based on the dynamic distortion component based on the calculated dynamic distortion sensitivity. 15. A dynamic strain measuring method for a dynamic strain measuring device provided with a strain sensor including a strain gauge, wherein a temperature change component caused by a temperature change around the strain sensor from the output of the strain sensor and the strain sensor. A signal component separating step for separating a distortion change component caused by a change in distortion applied to the first and second components; and a dynamic distortion / temperature ratio calculation for determining a ratio between the dynamic distortion component and the temperature change component to generate a dynamic distortion / temperature ratio. A dynamic strain measurement method, comprising: 16. The dynamic distortion measuring method according to claim 15, wherein the signal component separating step includes: a first separating step of separating a frequency component lower than a predetermined frequency from the output as the temperature change component; A second separating step of separating a frequency component equal to or higher than a predetermined frequency as the dynamic distortion component. 17. The dynamic strain measurement method according to claim 15, wherein the predetermined frequency is a frequency of 5 [Hz] or less. 18. The dynamic strain measuring method according to claim 15, wherein a dynamic strain sensitivity at a temperature corresponding to a temperature corresponding to the temperature change component signal is stored in advance. And a dynamic distortion amount correction step of correcting a dynamic distortion amount obtained based on the dynamic distortion / temperature ratio based on the calculated dynamic distortion sensitivity. Dynamic strain measurement method.