JPH0280925A - System for inspecting vibration testing apparatus - Google Patents
System for inspecting vibration testing apparatusInfo
- Publication number
- JPH0280925A JPH0280925A JP63232956A JP23295688A JPH0280925A JP H0280925 A JPH0280925 A JP H0280925A JP 63232956 A JP63232956 A JP 63232956A JP 23295688 A JP23295688 A JP 23295688A JP H0280925 A JPH0280925 A JP H0280925A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- vibration
- inspection
- fast fourier
- vibration testing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 44
- 238000007689 inspection Methods 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000001133 acceleration Effects 0.000 claims abstract description 7
- 230000001131 transforming effect Effects 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 abstract description 8
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000008054 signal transmission Effects 0.000 abstract description 3
- 230000001427 coherent effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000001228 spectrum Methods 0.000 description 6
- 230000005856 abnormality Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
Description
【発明の詳細な説明】
〔概要〕
振動試験装置の検査方式に関し、
振動試験装置の事故や故障を的確にチエ、・りすること
ができる振動試験装置の検査方式を提供することを目的
とし、
入力される駆動信号に基いて被試験体に振動を加える加
振部と、該振動に対して該被試験体が応答する加速度の
大きさを検出する検出部とを有して該被試験体の振動試
験を行う装置において、該加振部を駆動する信号を発生
する手段と、該発生手段からの駆動信号及び前記検出部
からの検出信号を高速フーリエ変換する手段、該高速フ
ーリエ変換された信号に基いてコヒーレンス関数を計算
する手段とを設け、該計算手段の計算結果に基いて前記
振動試験装置を検査するように構成する。[Detailed Description of the Invention] [Summary] Regarding an inspection method for vibration testing equipment, the present invention aims to provide an inspection method for vibration testing equipment that can accurately check for accidents and failures in the vibration testing equipment. The test object has an excitation section that applies vibration to the test object based on an input drive signal, and a detection section that detects the magnitude of acceleration that the test object responds to the vibration. An apparatus for performing a vibration test, comprising: means for generating a signal for driving the vibrating section; means for fast Fourier transforming the drive signal from the generating means and the detection signal from the detecting section; means for calculating a coherence function based on the signal, and the vibration testing apparatus is configured to be tested based on the calculation result of the calculation means.
〔産業−Ｆ２の利用分野〕
本発明は、振動試験を行う振動試験装置の検査方式に関
する。[Industry-Field of Application of F2] The present invention relates to an inspection method for a vibration testing device that performs a vibration test.
近年、被試験体に振動を加えて周波数応答スペクトルを
求め、被試験体の周波数に対する共振点や耐振性等を把
握して製品等の改良を図るなどの目的で振動試験装置が
製造業等に広く使用されている。従って、振動試験装置
の故障、障害等を検出すると共に、その信号伝送系がノ
イズ等の影ツを受けることなく正しく動作することを確
認する振動試験装置の検査方法が望まれている。In recent years, vibration testing equipment has been used in the manufacturing industry for the purpose of applying vibration to a test object to obtain a frequency response spectrum, understanding the resonance point and vibration resistance of the test object to the frequency, and improving products. Widely used. Therefore, there is a need for a method of testing vibration testing equipment that detects failures, failures, etc. in the vibration testing equipment, and also confirms that the signal transmission system operates correctly without being affected by noise or the like.
第３図は従来例を示すブロック図である。全図を通して
同一符号は同一対象物を示す。FIG. 3 is a block diagram showing a conventional example. The same reference numerals indicate the same objects throughout the figures.
図において、
コントローラ９ａは、所定の周波数帯域において正弦波
等の信号周波数を掃引変化させる電気的駆動信号を出力
し、加振機２ａは駆動信号に応じた周波数の振動をテー
ブル２ｂに発生させて被試験体１ａに振動を加え、テー
ブル２ｂに取り付けられたセンサ３ａは被試験体１ａが
応答する加速度を電気信号に変換して出力する。コント
ローラ９ａは、この応答信号を解析して周波数応答スペ
クトルを求めることによって振動試験を行う。この試験
を実施する前に振動試験装置が正常に動作することを確
認する必要があり、コントローラ９ａは、駆動信号の発
生時にセンサから所定値以上の電圧レベルを検出するこ
とにより制御ループが断線等がなく閉ループを形成して
いること、かつ、駆動信号の停止時にセンサから所定値
以上の電圧レベルを検出しないことにより制御ループに
ノイズ等の影害がないことを確認して振動試験装置が正
常であることを確認するように構成されている。In the figure, the controller 9a outputs an electrical drive signal that sweeps and changes the signal frequency, such as a sine wave, in a predetermined frequency band, and the vibrator 2a generates vibrations at a frequency corresponding to the drive signal on the table 2b. Vibration is applied to the test object 1a, and the sensor 3a attached to the table 2b converts the acceleration responded by the test object 1a into an electrical signal and outputs the electrical signal. The controller 9a performs a vibration test by analyzing this response signal and obtaining a frequency response spectrum. Before conducting this test, it is necessary to confirm that the vibration test device operates normally, and the controller 9a detects a voltage level of a predetermined value or higher from the sensor when a drive signal is generated, thereby preventing the control loop from breaking. The vibration test equipment is operating normally by confirming that there is no noise or other influence on the control loop by not detecting a voltage level higher than a predetermined value from the sensor when the drive signal is stopped. is configured to confirm that
振動試験においてはセンサ３ａが外れたり、接触不良を
生じたり、また故障する可能性は高いが、上記のように
従来方法によると駆動信号を発生又は停止させた時のセ
ンサ３ａからの応答信号の出力電圧のレベルによって加
振システムの正常性を検査するので、センサ３ａからの
応答信号とこれら事故や故障との相関関係を的確にチエ
ツクすることができないという問題点があった。In a vibration test, there is a high possibility that the sensor 3a will come off, have poor contact, or break down, but as described above, according to the conventional method, the response signal from the sensor 3a when the drive signal is generated or stopped is Since the normality of the vibration system is tested based on the level of the output voltage, there is a problem in that it is not possible to accurately check the correlation between the response signal from the sensor 3a and these accidents and failures.
本発明は、振動試験装置の事故や故障を的確にチエツク
することができる振動試験装置の検査方式を提供するこ
とを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide an inspection method for vibration testing equipment that can accurately check for accidents or failures in the vibration testing equipment.
第１図は本発明の原理ブロック図を示す。 FIG. 1 shows a block diagram of the principle of the present invention.
図において、
２は入力される駆動信号に基いて被試験体１に振動を加
える加振部、
３は該振動に対して被試験体１が応答する加速度の大き
さを検出する検出部、
４は加振部２を駆動する信号を発生する手段、５は発生
手段４からの駆動信号及び検出部３からの検出信号を高
速フーリエ変換する手段、６は該高速フーリエ変換され
た信号に基いてコヒーレンス関数を計算する手段である
。In the figure, 2 is an excitation unit that applies vibration to the test object 1 based on the input drive signal, 3 is a detection unit that detects the magnitude of acceleration that the test object 1 responds to the vibration, and 4 5 is a means for generating a signal for driving the vibrating section 2; 5 is a means for fast Fourier transforming the drive signal from the generating means 4 and the detection signal from the detecting section 3; 6 is a means for fast Fourier transforming the driving signal from the generating means 4 and the detection signal from the detecting section 3; It is a means of calculating a coherence function.
従って、計算手段６の計算結果に基いて振動試験装置を
検査するように構成されている。Therefore, the vibration testing device is configured to be tested based on the calculation results of the calculation means 6.
本発明によれば、加振部２は発生手段４からの駆動信号
に基いて被試験体１を振動させ、検出部３は被試験体１
が応答する加速度の大きさを検出し、変換手段５は発生
手段４からの駆動信号及び検出部３からの検出信号を高
速フーリエ変換し、計算手段６は該高速フーリエ変換さ
れた信号に基いてコヒーレンス関数を計算するので、計
算手段６の計算結果に基いて雑音や他信号の混入を判定
することにより振動試験装置を検査することができる。According to the present invention, the vibrating section 2 vibrates the test object 1 based on the drive signal from the generating means 4, and the detecting section 3 vibrates the test object 1 based on the drive signal from the generating means 4.
The converting means 5 performs fast Fourier transform on the drive signal from the generating means 4 and the detection signal from the detecting section 3, and the calculating means 6 performs fast Fourier transform on the drive signal from the generating means 4 and the detection signal from the detecting section 3. Since the coherence function is calculated, the vibration testing apparatus can be inspected by determining whether noise or other signals are mixed in based on the calculation results of the calculation means 6.
以下、本発明の実施例を第２図を参照して説明する。全
図を通じて同一符号は同一対象物を示す。Hereinafter, embodiments of the present invention will be described with reference to FIG. The same reference numerals indicate the same objects throughout the figures.
第２図で第１図に対応するものは一点鎖線で囲んである
。Components in FIG. 2 that correspond to those in FIG. 1 are surrounded by dashed lines.
図において、
信号発生部４ｂは、加振機２ａを駆動するディジタル信
号を時間ｔの関数ｘ （ｔｌとして出力する。In the figure, the signal generator 4b outputs a digital signal that drives the vibrator 2a as a function x (tl) of time t.
Ａ／Ｄ変換部５ｂは、センサ３ａからの加速度のアナロ
グ応答信号をディジタル変換して、時間ｔの関数ｙ （
ｔｌを出力する。The A/D converter 5b digitally converts the analog response signal of the acceleration from the sensor 3a, and converts the analog response signal of acceleration from the sensor 3a into a function y (
Output tl.
高速フーリエ変換（以下、ＦＦＴという）部５ｃは、ｘ
（ｔｌ及びｙ （ｔｌを高速フーリエ変換して、夫々
、周波数ｆの関数Ｘ ｆｆｌ及びＹ （ｆ）を出力する
。The fast Fourier transform (hereinafter referred to as FFT) section 5c performs x
(tl and y (tl is fast Fourier transformed to output functions X ffl and Y (f) of frequency f, respectively.
検査部６ｂは、ＦＦＴ部５ｃからの周波数関数Ｘ （ｆ
ｌ及びＹ （ｆｌに基いてコヒーレンス関数：ＸＹ（ｆ
）２
ＣＯＨ（ｆ）＝
Ｘ（ｆｌ Ｙ（［１２
（ここで、記号１１は複素数の絶対値を示し、ＸＹ（ｆ
ｉｌ”は人出力信号間のクロススペクトル、Ｘ（ｆｉｌ
”は入力信号のオートパワースペクトル、Ｙ（１２は出
力信号のオートパワースペクトルを表す。）
を検査の全周波数について計算し、平均値を求める。コ
ヒーレンス関数はＯ〜１の値を有し、１に近い程伝送系
への入力信号及びその出力信号の関連度が高いことを示
す公知の関数であって、所定値（例えば、０．９）以上
か否かに基いてノイズや他信号の混入の程度などを判定
し、判定結果を表示部７ｂに表示する。The inspection unit 6b calculates the frequency function X (f
l and Y (coherence function based on fl: XY(f
)2 COH(f)=X(fl Y([12 (Here, symbol 11 indicates the absolute value of the complex number, and XY(f
il” is the cross spectrum between human output signals, X(fil
” is the autopower spectrum of the input signal, Y (12 represents the autopower spectrum of the output signal) is calculated for all frequencies of inspection, and the average value is obtained. The coherence function has a value of O ~ 1, and 1 It is a known function that indicates that the closer the correlation between the input signal to the transmission system and its output signal, the higher the degree of correlation between the input signal to the transmission system and its output signal. The determination result is displayed on the display section 7b.
従って、予め、ＦＦＴ部５ｃ及び検査部６ｂは、信号発
生部４ｂからの駆動信号及びセンサ３ａからの応答信号
を解析することによって信号伝送系のノイズの混入、断
線等・を検査して検査結果を表示し、オペレータは異常
があれば異常要因を除去して振動試験装置の正常性を確
認した後、被試験体１ａの周波数応答スペクトルを求め
る本番の振動試験を実施するように構成されている。Therefore, in advance, the FFT section 5c and the inspection section 6b analyze the drive signal from the signal generation section 4b and the response signal from the sensor 3a to inspect the signal transmission system for noise contamination, disconnection, etc., and check the inspection results. is displayed, and if there is an abnormality, the operator removes the cause of the abnormality and confirms the normality of the vibration test equipment, and then performs the actual vibration test to obtain the frequency response spectrum of the test object 1a. .
以上説明したように本発明によれば、特別なハードウェ
アを設ける必要なく、コントローラ９ｂに検査用のプロ
グラムを追加するだけで、制御ループのノイズの混入、
断線を同時に検査でき、かつ、センサの取付は不良など
従来の検査方法では検出が困難であった障害を検出する
ことができるという効果がある。As explained above, according to the present invention, there is no need to provide special hardware, and by simply adding a test program to the controller 9b, noise contamination in the control loop can be prevented.
This method has the advantage that it is possible to simultaneously inspect for wire breaks, and to detect faults that are difficult to detect using conventional inspection methods, such as improperly installed sensors.
第１図は本発明の原理ブロック図、
第２図は本発明の実施例を示すブロック図、第３図は従
来例を示すブロック図である。
図において、
１．１ａは被試験体、
２は加振部、
２ａは加振機、
３は検出部、
４は信号発生手段、
５は変換手段、
５ｂはＡ／Ｄ変換部、
６は計算手段、
７ｂは表示部、
を示す。
５ｃはＦＦＴ部、
６ｂは検査部、
９ａ、 ９ｂはコントローラ
２ｂはテーブル、
３ａはセンサ、
４ｂは信号発生部、
第 １ 図
本、劣４日月の欠゛ろ他、イタ１腿ホ１フ′”ロック図
第 Ｚ 図FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a block diagram showing a conventional example. In the figure, 1.1a is the test object, 2 is the vibrator, 2a is the vibrator, 3 is the detection unit, 4 is the signal generation means, 5 is the conversion means, 5b is the A/D conversion unit, 6 is the calculation 7b is a display unit. 5c is an FFT section, 6b is an inspection section, 9a, 9b is a controller 2b is a table, 3a is a sensor, 4b is a signal generation section, Fig. ’”Lock diagram Diagram Z
Claims (1)
える加振部（２）と、該振動に対して該被試験体（１）
が応答する加速度の大きさを検出する検出部（３）とを
有して該被試験体（１）の振動試験を行う装置において
、 該加振部（２）を駆動する信号を発生する手段（４）と
、 該発生手段（４）からの駆動信号及び前記検出部（３）
からの検出信号を高速フーリエ変換する手段（５）と、 該高速フーリエ変換された信号に基いてコヒーレンス関
数を計算する手段（６）とを設け、該計算手段（６）の
計算結果に基いて前記振動試験装置を検査することを特
徴とする振動試験装置検査方式。[Claims] A vibrator (2) that applies vibration to the object under test (1) based on an input drive signal;
In an apparatus for performing a vibration test on the test object (1), the apparatus includes a detection section (3) for detecting the magnitude of acceleration to which the test object (1) responds, and means for generating a signal for driving the vibrating section (2). (4), a drive signal from the generating means (4) and the detection section (3);
means (5) for fast Fourier transforming a detection signal from the signal; and means (6) for calculating a coherence function based on the fast Fourier transformed signal; A vibration test device inspection method, characterized in that the vibration test device is inspected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63232956A JPH0678936B2 (en) | 1988-09-16 | 1988-09-16 | Vibration test equipment inspection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63232956A JPH0678936B2 (en) | 1988-09-16 | 1988-09-16 | Vibration test equipment inspection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0280925A true JPH0280925A (en) | 1990-03-22 |
| JPH0678936B2 JPH0678936B2 (en) | 1994-10-05 |
Family
ID=16947500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63232956A Expired - Lifetime JPH0678936B2 (en) | 1988-09-16 | 1988-09-16 | Vibration test equipment inspection method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0678936B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014064924A1 (en) * | 2012-10-24 | 2014-05-01 | 京セラ株式会社 | Vibration pick-up device, vibration measurement device, measurement system, and measurement method |
| JP2014171126A (en) * | 2013-03-04 | 2014-09-18 | Kyocera Corp | Measurement device and measurement method |
| WO2016147800A1 (en) * | 2015-03-19 | 2016-09-22 | Ntn株式会社 | Anomaly diagnostic device |
| JP2017026514A (en) * | 2015-07-24 | 2017-02-02 | Ntn株式会社 | Abnormality examination device and off-sensor detection method |
| JP2017098963A (en) * | 2016-12-02 | 2017-06-01 | 京セラ株式会社 | measuring device |
-
1988
- 1988-09-16 JP JP63232956A patent/JPH0678936B2/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014064924A1 (en) * | 2012-10-24 | 2014-05-01 | 京セラ株式会社 | Vibration pick-up device, vibration measurement device, measurement system, and measurement method |
| US9462374B2 (en) | 2012-10-24 | 2016-10-04 | Kyocera Corporation | Vibration pickup device, vibration measurement device, measurement system, and measurement method |
| US9591401B2 (en) | 2012-10-24 | 2017-03-07 | Kyocera Corporation | Vibration pickup device, vibration measurement device, measurement system, and measurement method |
| US9596535B2 (en) | 2012-10-24 | 2017-03-14 | Kyocera Corporation | Vibration pickup device, vibration measurement device, measurement system, and measurement method |
| JP2014171126A (en) * | 2013-03-04 | 2014-09-18 | Kyocera Corp | Measurement device and measurement method |
| WO2016147800A1 (en) * | 2015-03-19 | 2016-09-22 | Ntn株式会社 | Anomaly diagnostic device |
| JP2017026514A (en) * | 2015-07-24 | 2017-02-02 | Ntn株式会社 | Abnormality examination device and off-sensor detection method |
| WO2017018112A1 (en) * | 2015-07-24 | 2017-02-02 | Ntn株式会社 | Abnormality diagnosing device and sensor detachment detecting method |
| US10830637B2 (en) | 2015-07-24 | 2020-11-10 | Ntn Corporation | Abnormality diagnosis device and sensor detachment detection method |
| JP2017098963A (en) * | 2016-12-02 | 2017-06-01 | 京セラ株式会社 | measuring device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0678936B2 (en) | 1994-10-05 |
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