JP2015158734A - 制御ループの周波数特性を算出する機能を有する数値制御装置 - Google Patents
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Abstract
【解決手段】正弦波信号を生成する正弦波生成部と、正弦波生成部から出力された正弦波信号を制御対象の制御ループ2に入力する制御ループ加振部と、制御ループ2に入力された入力信号と制御対象が出力する出力信号を一定の周期でサンプリングするデータ取得部と、入力信号および出力信号のサンプリングデータを用いて制御ループの周波数特性を算出する周波数特性算出部14とを備え、制御対象を制御する数値制御装置において、正弦波信号の初期位相を、正弦波生成部に設けた位相シフト部により一定量だけシフトした正弦波信号を制御ループ2に複数回入力したデータを用いて、周波数特性算出部14が制御ループの周波数特性を算出することにより、測定精度を向上させる。
【選択図】図4
Description
(2) 次に、入力信号U(t)と、この入力信号U(t)が制御ループ2に入力された際に、制御対象3から出力される出力信号Y(t)をサンプリング周期Δt毎にデータ取得部が取得し、周波数特性算出部14に入力する。
(3) 周波数特性算出部14では、入力された入力信号U(kΔt)と出力信号Y(kΔt)をフーリエ変換し、周波数領域ωの関数U(ω)とY(ω)に変換する。
(4) この後、周波数特性算出部14は、入力信号U(ω)と出力信号Y(ω)から振幅比|Y(ω)/U(ω)|と位相差ψを算出する。
(5) 数値制御装置1では、正弦波生成部から制御ループ2に入力される入力信号U(t)の周波数f(ω=2πf)を変更しながら(1)〜(4)の処理が繰り返され、周波数毎の振幅比|Y(ω)/U(ω)|と位相差ψから周波数特性算出部14がボード線図を作成する。
2 制御ループ
3 制御対象
10 位相シフト部
11 正弦波生成部
12 制御ループ加振部
13 データ取得部
14 周波数特性算出部
ここで、入力信号をU(s)、出力信号をY(s)とすると、伝達関数G(s)は式1で表される。
G(s)=Y(s)/U(s)=L[Y(t)]/L[U(t)]・・・(1)
そして、s=jωを式1に代入すると、式2のように分母と分子が複素数で表される。
G(s)=Y(jω)/U(jω)=(x 2 +j・y 2 )/(x 1 +j・y 1 )・・・(2)
分子、分母は、f=ω/2πで入力信号U(t)と出力信号Y(t)をフーリエ変換した時の値になるので、下記の式3,式4,式5及び式6は、x 1 、y 1、 x 2 、y 2 に対応することが分る。
但し、Tを測定時間、Δtをサンプリング時間として、N=T/Δtである。
Claims (6)
- 少なくとも1つの制御対象を制御する数値制御装置であって、
正弦波信号を生成する正弦波生成部と、
前記正弦波生成部から出力された正弦波信号を前記制御対象の制御ループに入力する制御ループ加振部と、
前記制御ループに入力された入力信号と前記制御対象が出力する出力信号を一定の周期でサンプリングするデータ取得部と、
入力信号および出力信号のサンプリングデータを用いて前記制御ループの周波数特性を算出する周波数特性算出部と、
前記正弦波信号の位相をシフトする位相シフト部とを備え、
所定の位相を初期位相とする正弦波信号と、初期位相を一定量だけシフトした正弦波信号とを前記制御ループに複数回入力したデータを用いて、前記周波数特性算出部が前記制御ループの周波数特性を算出することを特徴とする数値制御装置。 - 前記位相シフト部は、初期位相を2π/nずつシフトした正弦波信号を発生し、
前記制御ループ加振部は、初期位相が2π/nずつシフトされた正弦波信号を前記制御ループに入力し、
前記周波数特性算出部は、前記制御ループにk回入力されたデータを用いて、前記制御ループの周波数特性を算出することを特徴とする請求項1に記載の数値制御装置。 - 前記位相シフト部は、初期位相を2π/nずつシフトしたk種類の正弦波信号を発生し、
前記制御ループ加振部は、初期位相が2π/nずつシフトされた前記k種類の正弦波信号をそれぞれ1回ずつ前記制御ループに入力し、
前記周波数特性算出部は、前記制御ループにk回入力されたデータを用いて、前記制御ループの周波数特性を算出することを特徴とする請求項1に記載の数値制御装置。 - 前記位相シフト部は、初期位相を2π/3シフトした正弦波信号と、−2π/3シフトした正弦波信号とを発生し、
前記制御ループ加振部は、所定の位相を初期位相とする正弦波信号、初期位相が2π/3シフトされた正弦波信号及び−2π/3シフトされた正弦波信号の3種類の正弦波信号を前記制御ループに入力し、
前記周波数特性算出部は、前記制御ループに入力された前記3種類の正弦波信号を用いて、前記制御ループの周波数特性を算出することを特徴とする請求項3に記載の数値制御装置。 - 入力信号の周波数が所定の周波数よりも低い場合、前記制御ループ加振部は、初期位相の正弦波信号を1回だけ前記制御ループに入力し、前記周波数特性算出部は、入力信号および出力信号のサンプリングデータを用いて前記制御ループの周波数特性を算出し、
入力信号の周波数が前記所定の周波数以上の場合、前記制御ループ加振部は、所定の位相を初期位相とする正弦波信号と初期位相をシフトした正弦波信号とを複数回前記制御ループに入力し、前記周波数特性算出部は、複数の入力信号および前記複数の入力信号に対応する複数の出力信号のサンプリングデータを用いて前記制御ループの周波数特性を算出する、
ことを特徴とする請求項1から4の何れか1項に記載の数値制御装置。 - 前記所定の周波数がナイキスト周波数であることを特徴とする請求項5に記載の数値制御装置。
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CN201510080151.7A CN104865889B (zh) | 2014-02-21 | 2015-02-13 | 具有计算控制环路的频率特性的功能的数值控制装置 |
DE102015001888.4A DE102015001888B4 (de) | 2014-02-21 | 2015-02-13 | Numerische Steuerung mit Berechnung der Frequenzcharakteristik eines Regelkreises |
US14/627,527 US9887865B2 (en) | 2014-02-21 | 2015-02-20 | Numerical control device having function of calculating frequency characteristic of control loop |
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JP2017188033A (ja) * | 2016-04-08 | 2017-10-12 | オークマ株式会社 | 送り軸制御装置における周波数特性測定方法 |
JP2020165795A (ja) * | 2019-03-29 | 2020-10-08 | ファナック株式会社 | 周波数特性測定装置、制御装置、及び周波数特性測定方法 |
JP2021015355A (ja) * | 2019-07-10 | 2021-02-12 | 三菱電機株式会社 | 制御装置および周波数特性の同定方法 |
DE112021007761T5 (de) | 2021-08-25 | 2024-04-18 | Fanuc Corporation | Steuergerät und steuerverfahren |
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US9762382B1 (en) * | 2016-02-18 | 2017-09-12 | Teradyne, Inc. | Time-aligning a signal |
US11486927B2 (en) * | 2020-04-02 | 2022-11-01 | Applied Materials, Inc. | Bode fingerprinting for characterizations and failure detections in processing chamber |
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JP2017188033A (ja) * | 2016-04-08 | 2017-10-12 | オークマ株式会社 | 送り軸制御装置における周波数特性測定方法 |
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JP2020165795A (ja) * | 2019-03-29 | 2020-10-08 | ファナック株式会社 | 周波数特性測定装置、制御装置、及び周波数特性測定方法 |
JP7007318B2 (ja) | 2019-03-29 | 2022-01-24 | ファナック株式会社 | 周波数特性測定装置、制御装置、及び周波数特性測定方法 |
US11698656B2 (en) | 2019-03-29 | 2023-07-11 | Fanuc Corporation | Frequency characteristic measurement device, controller and frequency characteristic measurement method |
JP2021015355A (ja) * | 2019-07-10 | 2021-02-12 | 三菱電機株式会社 | 制御装置および周波数特性の同定方法 |
JP7162574B2 (ja) | 2019-07-10 | 2022-10-28 | 三菱電機株式会社 | 制御装置および周波数特性の同定方法 |
DE112021007761T5 (de) | 2021-08-25 | 2024-04-18 | Fanuc Corporation | Steuergerät und steuerverfahren |
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US9887865B2 (en) | 2018-02-06 |
DE102015001888A1 (de) | 2015-08-27 |
US20150241869A1 (en) | 2015-08-27 |
JP5813151B2 (ja) | 2015-11-17 |
CN104865889A (zh) | 2015-08-26 |
DE102015001888B4 (de) | 2017-03-30 |
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