JP6922065B1 - Rotation speed detection system and rotation speed detection device for rotating equipment - Google Patents

Rotation speed detection system and rotation speed detection device for rotating equipment Download PDF

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JP6922065B1
JP6922065B1 JP2020212691A JP2020212691A JP6922065B1 JP 6922065 B1 JP6922065 B1 JP 6922065B1 JP 2020212691 A JP2020212691 A JP 2020212691A JP 2020212691 A JP2020212691 A JP 2020212691A JP 6922065 B1 JP6922065 B1 JP 6922065B1
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JP2022098983A (en
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雅司 ▲高▼橋
雅司 ▲高▼橋
直毅 山森
直毅 山森
龍太郎 古高
龍太郎 古高
晃 庄▲崎▼
晃 庄▲崎▼
一登 小松
一登 小松
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Kubota Corp
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Abstract

【課題】簡単に回転機器の実回転数を求めることができるようにする。【解決手段】回転機器の回転数検出システムは、設備に設置された回転機器において、回転機器が回転しているときの振動を検出する振動検出装置と、振動検出装置が検出した振動を解析したときの複数のピーク周波数を抽出するピーク抽出部と、ピーク抽出部が検出した複数のピーク周波数のそれぞれに対して、ピーク周波数を評価する評価指標を演算する評価演算部と、評価演算部で演算された複数の評価指標に基づいて、回転機器の実回転数を演算する回転演算部と、を備えている。【選択図】 図１PROBLEM TO BE SOLVED: To easily obtain an actual rotation speed of a rotating device. A rotation speed detection system for a rotating device analyzes a vibration detecting device that detects vibration when the rotating device is rotating and a vibration detected by the vibration detecting device in the rotating device installed in the facility. A peak extraction unit that extracts a plurality of peak frequencies at the time, an evaluation calculation unit that calculates an evaluation index for evaluating the peak frequency for each of the plurality of peak frequencies detected by the peak extraction unit, and an evaluation calculation unit that calculates the evaluation index. It is provided with a rotation calculation unit that calculates the actual rotation speed of the rotating device based on the plurality of evaluation indexes. [Selection diagram] Fig. 1

Description

本発明は、回転機器の回転数検出システム及び回転数検出装置に関する。 The present invention relates to a rotation speed detection system and a rotation speed detection device for rotating equipment.

水処理設備には攪拌機、ポンプおよび脱水機等の多くの回転機器が使用されている。上水設備、下水処理設備および工場等における排水処理設備において、回転機器の実回転数を正確に把握することは重要である。
特許文献１は、被試験装置に設置されたセンサで測定した物理量によって転がり軸受の状態監視を行なう状態監視方法であって、センサによって測定した測定波形のデータに対して高速フーリエ変換を少なくとも１回実行して、変換後波形を生成するステップと、 変換後波形の少なくとも３か所のピークを中心とした、少なくとも３つの特徴量算出範囲における変換後波形の部分波形から第１特徴量を算出するステップと、第１特徴量を用いて、転がり軸受の異常を検出するステップとを備えている。 Many rotating equipment such as stirrers, pumps and dehydrators are used in water treatment equipment. In water supply equipment, sewage treatment equipment, wastewater treatment equipment in factories, etc., it is important to accurately grasp the actual rotation speed of rotating equipment.
Patent Document 1 is a state monitoring method in which the state of a rolling bearing is monitored by a physical quantity measured by a sensor installed in a device under test, and fast Fourier transform is performed at least once on the measurement waveform data measured by the sensor. The first feature quantity is calculated from the step of generating the transformed waveform and the partial waveform of the converted waveform in at least three feature quantity calculation ranges centered on at least three peaks of the converted waveform. It includes a step and a step of detecting an abnormality of the rolling bearing by using the first feature quantity.

特開２０１９−４５４７２号公報Japanese Unexamined Patent Publication No. 2019-45472

特許文献１では、測定波形のデータのピークのうち、３つの特徴量を見ることによって転がり軸受の異常を検出することができるものの、回転機器の実回転数を把握することができないのが実情である。
本発明は、上述の問題に鑑みてなされたもので、簡単に回転機器の実回転数を求めることができる回転機器の回転数検出システム及び回転数検出装置を提供することを目的とする。 In Patent Document 1, although it is possible to detect an abnormality in a rolling bearing by looking at three feature quantities of the peaks of the measured waveform data, the actual situation is that the actual rotation speed of the rotating device cannot be grasped. be.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotation speed detection system and a rotation speed detection device for a rotating device, which can easily obtain the actual rotation speed of the rotating device.

回転機器の回転数検出システムは、設備に設置された回転機器において、前記回転機器が回転しているときの振動を検出する振動検出装置と、前記振動検出装置が検出した振動を解析したときの複数のピーク周波数を抽出するピーク抽出部と、前記ピーク抽出部が検出した前記複数のピーク周波数のそれぞれに対して、前記ピーク周波数を評価する評価指標を演算する評価演算部と、前記評価演算部で演算された複数の評価指標に基づいて、前記回転機器の実回転数を演算する回転演算部と、を備え、前記評価演算部は、前記複数のピーク周波数のそれぞれに対して、前記ピーク周波数よりも小さい複数の下側周波数と、前記ピーク周波数よりも大きい複数の上側周波数とを抽出し、前記複数の下側周波数及び前記複数の上側周波数に基づいて、前記ピーク周波数の急峻度及び前記ピーク周波数の対称度合を示す前記評価指標を演算する。 The rotation frequency detection system of the rotating device is a vibration detecting device that detects the vibration when the rotating device is rotating in the rotating device installed in the equipment, and analyzes the vibration detected by the vibration detecting device. A peak extraction unit that extracts a plurality of peak frequencies, an evaluation calculation unit that calculates an evaluation index for evaluating the peak frequency for each of the plurality of peak frequencies detected by the peak extraction unit, and the evaluation calculation unit. The evaluation calculation unit includes a rotation calculation unit that calculates the actual rotation speed of the rotation device based on the plurality of evaluation indexes calculated in the above, and the evaluation calculation unit has the peak frequency for each of the plurality of peak frequencies. A plurality of lower frequencies smaller than the peak frequency and a plurality of upper frequencies larger than the peak frequency are extracted, and the steepness of the peak frequency and the peak are based on the plurality of lower frequencies and the plurality of upper frequencies. It calculates the evaluation index indicating the symmetry degree of frequency.

前記回転演算部は、前記回転機器の設計回転数と、前記評価指標とに基づいて、前記回転機器の実回転数を演算する。
前記回転演算部は、前記複数の評価指標のうち、最も評価指標が大きい評価指標を抽出し、前記抽出した評価指標に対応する前記ピーク周波数と、前記設計回転数に対応する設計周波数とに基づいて前記回転機器の実回転数を演算する。 The rotation calculation unit calculates the actual rotation speed of the rotating device based on the design rotation speed of the rotating device and the evaluation index.
The rotation calculation unit extracts the evaluation index having the largest evaluation index from the plurality of evaluation indexes, and is based on the peak frequency corresponding to the extracted evaluation index and the design frequency corresponding to the design rotation speed. The actual rotation speed of the rotating device is calculated.

回転機器の回転数検出装置は、前記回転機器の回転数検出システムを備えている。 Speed detecting device of the rotating device is that have a speed detecting system of the rotating device.

本発明によれば、簡単に回転機器の実回転数を求めることができる。 According to the present invention, the actual rotation speed of the rotating device can be easily obtained.

回転機器の回転数検出システムの全体図である。It is the whole view of the rotation speed detection system of a rotating device. 水処理設備の一例を示す図である。It is a figure which shows an example of a water treatment facility. 回転機器を解析したときのスペクトルを示す図である。It is a figure which shows the spectrum when the rotating device is analyzed. 複数の下側周波数Ｐｎｄｉ及び上側周波数Ｐｎｕｋの説明図である。It is explanatory drawing of a plurality of lower frequency Pndi and upper frequency Pnuk. 評価指標ＨＴｎ、ピーク周波数Ｐｎ、下側周波数Ｐｎｄｉ、上側周波数Ｐｎｕｋ及び傾きの関係を示す図である。It is a figure which shows the relationship between the evaluation index HTn, the peak frequency Pn, the lower frequency Pndi, the upper frequency Pnuk, and the slope. 回転機器の回転数検出システムの動作を示す図である。It is a figure which shows the operation of the rotation speed detection system of a rotating device.

図１は、回転機器の回転数検出システム１及び回転検出システムを備えた回転数検出装置を示す図である。
図１に示す回転機器の回転数検出システム１及び回転検出システムを備えた回転数検出装置は、モータ、モータに連結されたポンプ、減速機などの回転機器の回転数を検出する。回転機器の回転数検出システム１は、例えば、図２に示す水処理設備２等に設けられたシステムである。なお、回転機器の回転数検出システム１は、水処理設備以外に設けられてもよく限定はされない。 FIG. 1 is a diagram showing a rotation speed detection system 1 of a rotation device and a rotation speed detection device including a rotation speed detection system.
The rotation speed detection system 1 of the rotating equipment shown in FIG. 1 and the rotation speed detecting device including the rotation detection system detect the rotation speed of the rotating equipment such as the motor, the pump connected to the motor, and the speed reducer. The rotation speed detection system 1 of the rotating device is, for example, a system provided in the water treatment facility 2 or the like shown in FIG. The rotation speed detection system 1 of the rotating equipment may be provided in addition to the water treatment equipment and is not limited.

まず、説明の便宜上、水処理設備２について説明する。
図２に示すように、水処理設備２は、水に関する処理をする設備であって、上水処理設備、下水処理設備などである。例えば、水処理設備２が下水処理設備である場合、図２に示すように、水処理設備２は、取水処理場１１、第１沈殿処理場１２、反応処理場１３、第２沈殿処理場１４、放流処理場１５を備えている。 First, for convenience of explanation, the water treatment facility 2 will be described.
As shown in FIG. 2, the water treatment facility 2 is a facility for treating water, such as a clean water treatment facility and a sewage treatment facility. For example, when the water treatment facility 2 is a sewage treatment facility, as shown in FIG. 2, the water treatment facility 2 includes an intake treatment plant 11, a first sedimentation treatment plant 12, a reaction treatment plant 13, and a second sedimentation treatment plant 14. , The discharge treatment plant 15 is provided.

取水処理場１１、第１沈殿処理場１２、反応処理場１３、第２沈殿処理場１４、放流処理場１５のそれぞれは、回転機器２１〜２６が設けられている。回転機器２１〜２６のそれぞれは、通信装置２７に接続されていて、回転機器２１〜２６の様々な情報が通信装置２７で受信することができる。通信装置２７で受信した様々な情報は、コンピュータ３１に送信可能である。 Rotating devices 21 to 26 are provided in each of the water intake treatment plant 11, the first precipitation treatment plant 12, the reaction treatment plant 13, the second precipitation treatment plant 14, and the discharge treatment plant 15. Each of the rotating devices 21 to 26 is connected to the communication device 27, and various information of the rotating devices 21 to 26 can be received by the communication device 27. Various information received by the communication device 27 can be transmitted to the computer 31.

図１に示すように、回転機器の回転数検出システム１は、振動検出装置３０と、コンピュータ３１とを備えている。振動検出装置３０は、水処理設備２などに設置された回転機器２１〜２６において、回転機器２１〜２６が回転しているときの振動を検出する装置である。振動検出装置３０は、例えば、測定部分の加速度を検出する加速度検出センサ、測定部分の速度を検出する速度検出センサ、測定部分の変位量を検出する変位検出センサなどである。即ち、振動検出装置３０は、測定部分の加速度、測定部分の速度、測定部分の変位量等によって、測定部分の振動を検出する装置である。 As shown in FIG. 1, the rotation speed detection system 1 of a rotating device includes a vibration detection device 30 and a computer 31. The vibration detection device 30 is a device that detects vibration when the rotating devices 21 to 26 are rotating in the rotating devices 21 to 26 installed in the water treatment facility 2 or the like. The vibration detection device 30 is, for example, an acceleration detection sensor that detects the acceleration of the measurement portion, a speed detection sensor that detects the speed of the measurement portion, a displacement detection sensor that detects the displacement amount of the measurement portion, and the like. That is, the vibration detection device 30 is a device that detects the vibration of the measurement portion based on the acceleration of the measurement portion, the speed of the measurement portion, the displacement amount of the measurement portion, and the like.

例えば、振動検出装置３０は、回転機器２１〜２６のそれぞれの筐体（測定部位）に固定された装置、又は、持ち運びが可能で回転機器２１〜２６のそれぞれの筐体（測定部位）にセンサ部を当てることが可能な装置であって、回転機器２１〜２６について、測定部分の回転数に応じて振動加速度、振動速度、振動変位のいずれかを測定する。
コンピュータ３１は、固定型コンピュータ(クラウドサーバ、オンプレミスサーバ)、スマートフォン、タブレット、ノートパソコン等の携帯型コンピュータである。コンピュータ３１は、振動検出装置３０が測定した測定情報を有線又は無線によって取得し、取得した情報を不揮発性メモリ等から構成された記憶装置３２に記憶する。 For example, the vibration detection device 30 is a device fixed to each housing (measurement site) of the rotating devices 21 to 26, or a portable sensor in each housing (measurement site) of the rotating devices 21 to 26. It is a device capable of hitting a portion, and measures any of vibration acceleration, vibration speed, and vibration displacement of the rotating devices 21 to 26 according to the rotation speed of the measurement portion.
The computer 31 is a portable computer such as a fixed computer (cloud server, on-premises server), a smartphone, a tablet, or a laptop computer. The computer 31 acquires the measurement information measured by the vibration detection device 30 by wire or wirelessly, and stores the acquired information in the storage device 32 composed of a non-volatile memory or the like.

コンピュータ３１は、解析部３１Ａと、ピーク抽出部３１Ｂと、評価演算部３１Ｃと、回転演算部３１Ｄとを有している。解析部３１Ａ、ピーク抽出部３１Ｂ、評価演算部３１Ｃ及び回転演算部３１Ｄは、コンピュータ３１に設けられた電気電子回路、当該コンピュータ３１に格納されたプログラム等から構成されている。
解析部３１Ａは、振動検出装置３０が測定した測定情報（振動加速度、振動速度、振動変位）に対して、高速フーリエ変換（ＦＦＴ）等を行うことにより、周波数解析を行う。例えば、解析部３１Ａの解析によって、図３に示すような、振動の周波数と、振動のピーク周波数Ｐｎ（ｎ＝１、２、３、４、５、６）とを含む解析結果（解析波形）Ｗ１を得ることができる。 The computer 31 has an analysis unit 31A, a peak extraction unit 31B, an evaluation calculation unit 31C, and a rotation calculation unit 31D. The analysis unit 31A, the peak extraction unit 31B, the evaluation calculation unit 31C, and the rotation calculation unit 31D are composed of an electric / electronic circuit provided in the computer 31, a program stored in the computer 31, and the like.
The analysis unit 31A performs frequency analysis by performing a fast Fourier transform (FFT) or the like on the measurement information (vibration acceleration, vibration velocity, vibration displacement) measured by the vibration detection device 30. For example, by the analysis of the analysis unit 31A, the analysis result (analysis waveform) including the vibration frequency and the vibration peak frequency Pn (n = 1, 2, 3, 4, 5, 6) as shown in FIG. W1 can be obtained.

ピーク抽出部３１Ｂは、解析部３１Ａが振動を解析したときの複数のピーク周波数Ｐｎを抽出する。例えば、ピーク抽出部３１Ｂは、解析した回転機器の設計回転数ＳＭを設計周波数に置き換えたとして、図３に示すような解析波形Ｗ１から、設計周波数の整数倍の周波数付近におけるピーク周波数Ｐｎを抽出する。例えば、定格の設計回転数ＳＭが３０００ｒｐｍ、即ち、設計周波数が５０Ｈｚであったとする。ピーク抽出部３１Ｂは、設計周波数の整数倍（５０Ｈｚ、１００Ｈｚ、１５０Ｈｚ、２００Ｈｚ、２４０Ｈｚ、２９０Ｈｚ・・・）の周辺周波数（設計回転数ＳＭ×ｎ倍±１０％）において、振幅（スペクトル強度）の最大値であるピーク周波数Ｐｎ（ｎ＝６：Ｐ１、Ｐ２、Ｐ３、Ｐ４、Ｐ５、Ｐ６）を抽出する。また、周辺周波数の±１０％は、任意に設定することが可能である。 The peak extraction unit 31B extracts a plurality of peak frequencies Pn when the analysis unit 31A analyzes the vibration. For example, assuming that the design rotation frequency SM of the analyzed rotating device is replaced with the design frequency, the peak extraction unit 31B extracts the peak frequency Pn near a frequency that is an integral multiple of the design frequency from the analysis waveform W1 as shown in FIG. do. For example, assume that the rated design rotation speed SM is 3000 rpm, that is, the design frequency is 50 Hz. The peak extraction unit 31B has an amplitude (spectral intensity) at a peripheral frequency (design rotation speed SM × n times ± 10%) that is an integral multiple of the design frequency (50 Hz, 100 Hz, 150 Hz, 200 Hz, 240 Hz, 290 Hz, etc.). The peak frequency Pn (n = 6: P1, P2, P3, P4, P5, P6) which is the maximum value is extracted. Further, ± 10% of the peripheral frequency can be arbitrarily set.

なお、図３では、説明の便宜上、ピーク抽出部３１Ｂは、５０Ｈｚ、９５Ｈｚ、１４５Ｈｚ、２００Ｈｚ、２４０Ｈｚ、２９０Ｈｚをピーク周波数Ｐ１〜Ｐ６として抽出したものとして説明を進める。
評価演算部３１Ｃは、ピーク抽出部３１Ｂが検出した複数のピーク周波数Ｐｎ（Ｐ１〜Ｐ６）のそれぞれに対して、ピーク周波数Ｐｎ（Ｐ１〜Ｐ６）を評価する評価指標ＨＴｎ（ＨＴ１〜ＨＴ６）を演算する。 In FIG. 3, for convenience of explanation, the peak extraction unit 31B will be described assuming that 50 Hz, 95 Hz, 145 Hz, 200 Hz, 240 Hz, and 290 Hz are extracted as peak frequencies P1 to P6.
The evaluation calculation unit 31C calculates an evaluation index HTn (HT1 to HT6) for evaluating the peak frequency Pn (P1 to P6) for each of the plurality of peak frequencies Pn (P1 to P6) detected by the peak extraction unit 31B. do.

図４に示すように、評価演算部３１Ｃは、複数のピーク周波数Ｐｎのうち、所定のピーク周波数（あるピーク周波数）Ｐｎに着目して、当該所定のピーク周波数Ｐｎよりも小さい複数の下側周波数Ｐｎｄｉ（ｎ＝１〜６、ｉ＝１〜５）と、所定のピーク周波数Ｐｎよりも上側周波数Ｐｎｕｋ（ｎ＝１〜６、ｋ＝１〜５）とを、測定情報（実測値）から抽出し、抽出した複数の下側周波数Ｐｎｄｉ及び複数の上側周波数Ｐｎｕｋとに基づいて、評価指標ＨＴｎを演算する。 As shown in FIG. 4, the evaluation calculation unit 31C focuses on a predetermined peak frequency (certain peak frequency) Pn among the plurality of peak frequencies Pn, and a plurality of lower frequencies smaller than the predetermined peak frequency Pn. Pndi (n = 1 to 6, i = 1 to 5) and frequencies Pnuk (n = 1 to 6, k = 1 to 5) above the predetermined peak frequency Pn are extracted from the measurement information (actual measurement values). Then, the evaluation index HTn is calculated based on the extracted plurality of lower frequency Pndi and the plurality of upper frequency Pnuk.

例えば、図５に示すように、ピーク周波数Ｐ１〜Ｐ６が６個ある場合、評価演算部３１Ｃは、ピーク周波数Ｐ１を中心とする下側周波数Ｐ１ｄ１〜Ｐ１ｄ５、上側周波数Ｐ１ｕ１〜Ｐ１ｕ５、ピーク周波数Ｐ２を中心とする下側周波数Ｐ２ｄ１〜Ｐ２ｄ５、上側周波数Ｐ２ｕ１〜Ｐ２ｕ５、ピーク周波数Ｐ３を中心とする下側周波数Ｐ３ｄ１〜Ｐ３ｄ５、上側周波数Ｐ３ｕ１〜Ｐ３ｕ５、ピーク周波数Ｐ４を中心とする下側周波数Ｐ４ｄ１〜Ｐ４ｄ５、上側周波数Ｐ４ｕ１〜Ｐ４ｕ５、ピーク周波数Ｐ５を中心とする下側周波数Ｐ５ｄ１〜Ｐ５ｄ５、上側周波数Ｐ５ｕ１〜Ｐ５ｕ５、ピーク周波数Ｐ６を中心とする下側周波数Ｐ６ｄ１〜Ｐ６ｄ５、上側周波数Ｐ６ｕ１〜Ｐ６ｕ５に基づいて、評価指標ＨＴ１〜ＨＴ６を演算する。 For example, as shown in FIG. 5, when there are six peak frequencies P1 to P6, the evaluation calculation unit 31C sets the lower frequencies P1d1 to P1d5, the upper frequencies P1u1 to P1u5, and the peak frequency P2 centered on the peak frequency P1. Lower frequencies P2d1 to P2d5 centered, upper frequencies P2u1 to P2u5, lower frequencies P3d1 to P3d5 centered on peak frequency P3, upper frequencies P3u1 to P3u5, lower frequencies P4d1 to P4d5 centered on peak frequency P4, Evaluation based on upper frequencies P4u1 to P4u5, lower frequencies P5d1 to P5d5 centered on peak frequency P5, upper frequencies P5u1 to P5u5, lower frequencies P6d1 to P6d5 centered on peak frequency P6, and upper frequencies P6u1 to P6u5. Calculate the indexes HT1 to HT6.

つまり、まず、図５に示すように、評価演算部３１Ｃは、ピーク周波数Ｐ１〜Ｐ６のそれぞれに対して、下側周波数Ｐｎｄ１〜Ｐｎｄ５、上側周波数Ｐｎｕ１〜Ｐｎｕ５と用いて評価指標ＨＴ１〜ＨＴ６を求める。
そして、評価演算部３１Ｃは、下側周波数Ｐｎｄ１〜Ｐｎｄ５によって下側の傾き「Ａ」を求め、上側周波数Ｐｎｕ１〜Ｐｎｕ５によって上側の傾き「Ｂ」を求め、傾きＡ、Ｂを式（１）に代入することにより、６個のピーク周波数Ｐ１〜Ｐ６のそれぞれの評価指標ＨＴｎを求める。なお、傾きＡ、Ｂは、絶対値であるとする。 That is, first, as shown in FIG. 5, the evaluation calculation unit 31C obtains the evaluation indexes HT1 to HT6 by using the lower frequencies Pnd1 to Pnd5 and the upper frequencies Pnu1 to Pnu5 for each of the peak frequencies P1 to P6. ..
Then, the evaluation calculation unit 31C obtains the lower slope "A" by the lower frequencies Pnd1 to Pnd5, obtains the upper slope "B" by the upper frequencies Pnu1 to Pnu5, and formulates the slopes A and B into the equation (1). By substituting, each evaluation index HTn of the six peak frequencies P1 to P6 is obtained. It is assumed that the slopes A and B are absolute values.

評価指標ＨＴｎ＝[(Ａ＋Ｂ)÷２]÷（│Ａ−Ｂ＋１│） ・・・（１）
式（１）の[(Ａ＋Ｂ)÷２]は、ピーク周波数Ｐｎの急峻度を評価する指標であり、式（１）の（│Ａ−Ｂ＋１│）は、ピーク周波数Ｐｎの下側及び上側の対称性（対称の度合い）を評価する指標である。つまり、評価演算部３１Ｃは、少なくとも複数の下側周波数Ｐｎｄｉ及び複数の上側周波数Ｐｎｕｋを用いて、ピーク周波数Ｐｎの急峻度及びピーク周波数Ｐｎの対称度合を評価指標ＨＴｎとして演算する。 Evaluation index HTn = [(A + B) ÷ 2] ÷ (│AB + 1│) ・ ・ ・ (1)
[(A + B) ÷ 2] in the formula (1) is an index for evaluating the steepness of the peak frequency Pn, and (│AB + 1│) in the formula (1) is the lower and upper sides of the peak frequency Pn. It is an index for evaluating symmetry (degree of symmetry). That is, the evaluation calculation unit 31C calculates the steepness of the peak frequency Pn and the degree of symmetry of the peak frequency Pn as the evaluation index HTn by using at least a plurality of lower frequency Pndi and a plurality of upper frequency Pnuk.

なお、上述した実施形態では、評価演算部３１Ｃは、式（１）を用いてピーク周波数Ｐｎの急峻度及びピーク周波数Ｐｎの対称度合を、評価指標ＨＴｎとして求めているが、ピーク周波数Ｐｎの急峻度及びピーク周波数Ｐｎの対称度合のいずれかを、評価指標ＨＴｎとして求めてもよい。
また、上述した実施形態では、ピーク周波数Ｐｎを中心として、下側に５個、上側に５個の下側周波数Ｐｎｄｉ、上側周波数Ｐｎｕｋを抽出して、評価指標ＨＴｎを求めていたが、下側周波数Ｐｎｄｉ及び上側周波数Ｐｎｕｋの個数は限定されない。なお、下側周波
数Ｐｎｄｉ及び上側周波数Ｐｎｕｋの個数は同じであることが好ましい。 In the above-described embodiment, the evaluation calculation unit 31C uses the equation (1) to obtain the steepness of the peak frequency Pn and the degree of symmetry of the peak frequency Pn as the evaluation index HTn, but the steepness of the peak frequency Pn. Either the degree or the degree of symmetry of the peak frequency Pn may be obtained as the evaluation index HTn.
Further, in the above-described embodiment, the evaluation index HTn is obtained by extracting 5 lower frequencies Pndi and 5 upper frequencies Pnuk on the lower side and 5 on the upper side with the peak frequency Pn as the center. The number of frequency Pndi and upper frequency Pnuk is not limited. It is preferable that the number of the lower frequency Pndi and the number of the upper frequency Pnuk are the same.

また、評価演算部３１Ｃは、複数のピーク周波数Ｐｎのそれぞれに対して、ピーク周波数Ｐｎよりも小さい複数の下側周波数Ｐｎｄｉ、又は、ピーク周波数Ｐｎよりも大きい複数の上側周波数Ｐｎｕｋを抽出し、抽出した複数の下側周波数Ｐｎｄｉ、又は、複数の上側周波数Ｐｎｕｋに基づいて、評価指標ＨＴｎを演算すればよく、下側周波数Ｐｎｄｉ及び上側周波数Ｐｎｕｋの両方を用いなくてもよい。 Further, the evaluation calculation unit 31C extracts and extracts a plurality of lower frequencies Pndi smaller than the peak frequency Pn or a plurality of upper frequencies Pnuk larger than the peak frequency Pn for each of the plurality of peak frequencies Pn. The evaluation index HTn may be calculated based on the plurality of lower frequency Pndi or the plurality of upper frequency Pnuk, and it is not necessary to use both the lower frequency Pndi and the upper frequency Pnuk.

次に、回転演算部３１Ｄは、評価演算部３１Ｃで演算された複数の評価指標ＨＴｎに基づいて、回転機器２１〜２６のそれぞれの実回転数を演算する。例えば、回転演算部３１Ｄは、回転機器２１〜２６のそれぞれの設計回転数ＳＭと、評価指標ＨＴｎとに基づいて、回転機器２１〜２６の実回転数を演算する。
回転演算部３１Ｄは、複数の評価指標ＨＴ１〜ＨＴ６のうち、最も評価指標ＨＴｎが大きい評価指標ＨＴｎを抽出し、抽出した評価指標ＨＴｎに対応するピーク周波数Ｐｎと、設計回転数ＳＭに対応する設計周波数とに基づいて回転機器２１〜２６の実回転数を演算する。例えば、ピーク周波数Ｐ１〜Ｐ６の評価指標ＨＴ１〜ＨＴ６のうち、評価指標ＨＴ４が最も大きい場合、回転演算部３１Ｄは、評価指標ＨＴ４に対応するピーク周波数Ｐ４（２００Ｈｚ）を抽出し、抽出したピーク周波数Ｐ４（２００Ｈｚ）をｎ数（整数倍：ｎ＝４）で割る（除算する）ことで、実周波数（５０Ｈｚ）を求め、実周波数（５０Ｈｚ）を実回転数（３０００ｒｐｍ）に換算することによって、実回転数（３０００ｒｐｍ）を求める。 Next, the rotation calculation unit 31D calculates the actual rotation speed of each of the rotation devices 21 to 26 based on the plurality of evaluation indexes HTn calculated by the evaluation calculation unit 31C. For example, the rotation calculation unit 31D calculates the actual rotation speed of the rotation devices 21 to 26 based on the design rotation speed SM of each of the rotation devices 21 to 26 and the evaluation index HTn.
The rotation calculation unit 31D extracts the evaluation index HTn having the largest evaluation index HTn from the plurality of evaluation indexes HT1 to HT6, and has a peak frequency Pn corresponding to the extracted evaluation index HTn and a design corresponding to the design rotation speed SM. The actual rotation speed of the rotating devices 21 to 26 is calculated based on the frequency. For example, when the evaluation index HT4 is the largest among the evaluation indexes HT1 to HT6 of the peak frequencies P1 to P6, the rotation calculation unit 31D extracts the peak frequency P4 (200 Hz) corresponding to the evaluation index HT4, and the extracted peak frequency. By dividing (dividing) P4 (200 Hz) by the number of n (integer multiple: n = 4), the actual frequency (50 Hz) is obtained, and by converting the actual frequency (50 Hz) into the actual rotation speed (3000 rpm), Obtain the actual rotation speed (3000 rpm).

以上のように、回転機器２１〜２６のそれぞれの振動に基づいて、当該回転機器２１〜２６のそれぞれの実回転数を求めることができる。
図６は、回転機器の回転数検出システム１の動作をまとめた図である。
図６に示すように、振動検出装置３０を用いて、測定対象の回転機器の振動を測定する（Ｓ１）。振動検出装置３０で測定した測定情報（測定結果）を記憶装置３２に記憶する（Ｓ２）。解析部３１Ａは、記憶装置３２から測定情報を抽出して、高速フーリエ変換（ＦＦＴ）等を行うことにより周波数解析を行う（Ｓ３）。ピーク抽出部３１Ｂは、解析波形Ｗ１を参照し、設計周波数の整数倍の周波数の付近、例えば、設計周波数の整数倍の±１０％前後の周波数領域において、複数のピーク周波数Ｐｎを抽出する（Ｓ４）。複数のピーク周波数Ｐｎ毎に評価指標ＨＴｎを演算する（Ｓ５）。複数のピーク周波数Ｐｎの全ての評価指標ＨＴｎの演算が終了すると、最も大きい評価指標ＨＴｎを抽出する（Ｓ６）。最も大きい評価指標ＨＴｎに対応するピーク周波数Ｐｎを整数倍ｎで除算して、除算した値（周波数）を実回転数に変換することにより、回転機器の実回転数を求める（Ｓ７）。なお、回転機器の実回転数は、コンピュータ３１等に表示することで、監視者等が実回転数を把握することができる。 As described above, the actual rotation speed of each of the rotating devices 21 to 26 can be obtained based on the respective vibrations of the rotating devices 21 to 26.
FIG. 6 is a diagram summarizing the operation of the rotation speed detection system 1 of the rotating device.
As shown in FIG. 6, the vibration detection device 30 is used to measure the vibration of the rotating device to be measured (S1). The measurement information (measurement result) measured by the vibration detection device 30 is stored in the storage device 32 (S2). The analysis unit 31A extracts measurement information from the storage device 32 and performs frequency analysis by performing a fast Fourier transform (FFT) or the like (S3). The peak extraction unit 31B refers to the analysis waveform W1 and extracts a plurality of peak frequencies Pn in the vicinity of a frequency that is an integral multiple of the design frequency, for example, in a frequency region of about ± 10% that is an integral multiple of the design frequency (S4). ). The evaluation index HTn is calculated for each of the plurality of peak frequencies Pn (S5). When the calculation of all the evaluation indexes HTn of the plurality of peak frequencies Pn is completed, the largest evaluation index HTn is extracted (S6). The actual rotation speed of the rotating device is obtained by dividing the peak frequency Pn corresponding to the largest evaluation index HTn by an integral multiple n and converting the divided value (frequency) into the actual rotation speed (S7). By displaying the actual rotation speed of the rotating device on the computer 31 or the like, the observer or the like can grasp the actual rotation speed.

回転機器の回転数検出システム１は、設備に設置された回転機器２１〜２６において、回転機器２１〜２６が回転しているときの振動を検出する振動検出装置３０と、振動検出装置３０が検出した振動を解析したときの複数のピーク周波数Ｐｎを抽出するピーク抽出部３１Ｂと、ピーク抽出部３１Ｂが検出した複数のピーク周波数Ｐｎのそれぞれに対して、ピーク周波数Ｐｎを評価する評価指標ＨＴｎを演算する評価演算部３１Ｃと、評価演算部３１Ｃで演算された複数の評価指標ＨＴｎに基づいて、回転機器２１〜２６の実回転数を演算する回転演算部３１Ｄと、を備えている。これによれば、回転機器２１〜２６が回転しているときの振動を解析したときのピーク周波数Ｐｎに基づいて、簡単に回転機器２１〜２６の実回転数を求めることができる。 In the rotation speed detection system 1 of the rotating device, the vibration detecting device 30 and the vibration detecting device 30 detect the vibration when the rotating devices 21 to 26 are rotating in the rotating devices 21 to 26 installed in the equipment. For each of the peak extraction unit 31B that extracts a plurality of peak frequency Pn when the generated vibration is analyzed and the plurality of peak frequency Pn detected by the peak extraction unit 31B, an evaluation index HTn for evaluating the peak frequency Pn is calculated. The evaluation calculation unit 31C is provided, and the rotation calculation unit 31D for calculating the actual rotation speed of the rotating devices 21 to 26 based on the plurality of evaluation indexes HTn calculated by the evaluation calculation unit 31C. According to this, the actual rotation speed of the rotating devices 21 to 26 can be easily obtained based on the peak frequency Pn when the vibration when the rotating devices 21 to 26 are rotating is analyzed.

回転演算部３１Ｄは、回転機器２１〜２６の設計回転数ＳＭと、評価指標ＨＴｎとに基づいて、回転機器２１〜２６の実回転数を演算する。これによれば、回転機器２１〜２６の設計回転数ＳＭと、評価指標ＨＴｎとによって回転機器２１〜２６の実回転数を求めることができる。
回転演算部３１Ｄは、複数の評価指標ＨＴｎのうち、最も評価指標ＨＴｎが大きい評価指標ＨＴｎを抽出し、抽出した評価指標ＨＴｎに対応するピーク周波数Ｐｎと、設計回転数ＳＭに対応する設計周波数とに基づいて回転機器２１〜２６の実回転数を演算する。こ
れによれば、特に、回転機器２１〜２６が定格で回転しているときなど、安定して回転しているときの実回転数を簡単に求めることができる。 The rotation calculation unit 31D calculates the actual rotation speed of the rotation devices 21 to 26 based on the design rotation speed SM of the rotation devices 21 to 26 and the evaluation index HTn. According to this, the actual rotation speed of the rotating devices 21 to 26 can be obtained from the design rotation speed SM of the rotating devices 21 to 26 and the evaluation index HTn.
The rotation calculation unit 31D extracts the evaluation index HTn having the largest evaluation index HTn from the plurality of evaluation index HTn, and has a peak frequency Pn corresponding to the extracted evaluation index HTn and a design frequency corresponding to the design rotation speed SM. The actual rotation speed of the rotating devices 21 to 26 is calculated based on. According to this, it is possible to easily obtain the actual number of rotations when the rotating devices 21 to 26 are rotating stably, such as when the rotating devices 21 to 26 are rotating at the rated value.

評価演算部３１Ｃは、複数のピーク周波数Ｐｎのそれぞれに対して、ピーク周波数Ｐｎよりも小さい複数の下側周波数と、ピーク周波数Ｐｎよりも大きい複数の上側周波数とを抽出し、抽出した複数の下側周波数及び複数の上側周波数とに基づいて、評価指標ＨＴｎを演算する。これによれば、回転機器２１〜２６が回転時における振動において、比較的実回転数を反映したピーク周波数Ｐｎを導くことができ、導かれたピーク周波数Ｐｎによって簡単に実回転数を把握することができる。 The evaluation calculation unit 31C extracts a plurality of lower frequencies smaller than the peak frequency Pn and a plurality of upper frequencies larger than the peak frequency Pn for each of the plurality of peak frequencies Pn, and extracts a plurality of lower frequencies. The evaluation index HTn is calculated based on the side frequency and the plurality of upper frequencies. According to this, the rotating devices 21 to 26 can derive a peak frequency Pn that relatively reflects the actual rotation speed in the vibration during rotation, and the actual rotation speed can be easily grasped by the derived peak frequency Pn. Can be done.

評価演算部３１Ｃは、複数のピーク周波数Ｐｎのそれぞれに対して、ピーク周波数Ｐｎよりも小さい複数の下側周波数、又は、ピーク周波数Ｐｎよりも大きい複数の上側周波数を抽出し、抽出した複数の下側周波数、又は、複数の上側周波数に基づいて、評価指標ＨＴｎを演算する。これによれば、回転機器２１〜２６が回転時における振動において、比較的実回転数を反映したピーク周波数Ｐｎを導くことができ、導かれたピーク周波数Ｐｎによって簡単に実回転数を把握することができる。 The evaluation calculation unit 31C extracts a plurality of lower frequencies smaller than the peak frequency Pn or a plurality of upper frequencies larger than the peak frequency Pn for each of the plurality of peak frequencies Pn, and extracts a plurality of lower frequencies. The evaluation index HTn is calculated based on the side frequency or a plurality of upper frequencies. According to this, the rotating devices 21 to 26 can derive a peak frequency Pn that relatively reflects the actual rotation speed in the vibration during rotation, and the actual rotation speed can be easily grasped by the derived peak frequency Pn. Can be done.

評価演算部３１Ｃは、少なくとも複数の下側周波数及び複数の上側周波数のいずれかを用いて、ピーク周波数Ｐｎの急峻度を評価指標ＨＴｎ、又は、ピーク周波数Ｐｎの対称度合を評価指標ＨＴｎとして演算する。これによれば、回転機器２１〜２６が回転時における振動において、比較的実回転数を反映したピーク周波数Ｐｎを導くことができ、導かれたピーク周波数Ｐｎによって簡単に実回転数を把握することができる。 The evaluation calculation unit 31C calculates the steepness of the peak frequency Pn as the evaluation index HTn or the degree of symmetry of the peak frequency Pn as the evaluation index HTn using at least one of a plurality of lower frequencies and a plurality of upper frequencies. .. According to this, the rotating devices 21 to 26 can derive a peak frequency Pn that relatively reflects the actual rotation speed in the vibration during rotation, and the actual rotation speed can be easily grasped by the derived peak frequency Pn. Can be done.

今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は上記した説明ではなくて特許請求の範囲によって示され、特許請求の範囲と均等の意味及び範囲内での全ての変更が含まれることが意図される。 It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

１ ：回転数検出システム
２ ：水処理設備
１１ ：取水処理場
１２ ：第１沈殿処理場
１３ ：反応処理場
１４ ：第２沈殿処理場
１５ ：放流処理場
２１〜２６：回転機器
２７ ：通信装置
３０ ：振動検出装置
３１ ：コンピュータ
３１Ａ ：解析部
３１Ｂ ：ピーク抽出部
３１Ｃ ：評価演算部
３１Ｄ ：回転演算部
３２ ：記憶装置
Ａ ：傾き
Ｂ ：傾き
ＨＴ１〜ＨＴ６：評価指標
ＨＴｎ ：評価指標
Ｐｎ ：ピーク周波数
Ｐｎｄｉ ：下側周波数
Ｐｎｕｋ ：上側周波数
ＳＭ ：設計回転数 1: Rotation speed detection system 2: Water treatment facility 11: Intake treatment plant 12: First sedimentation treatment plant 13: Reaction treatment plant 14: Second sedimentation treatment plant 15: Discharge treatment plant 21-26: Rotating equipment 27: Communication device 30: Vibration detection device 31: Computer 31A: Analysis unit 31B: Peak extraction unit 31C: Evaluation calculation unit 31D: Rotation calculation unit 32: Storage device A: Tilt B: Tilt HT1 to HT6: Evaluation index HTn: Evaluation index Pn: Peak Frequency Pndi: Lower frequency Pnuk: Upper frequency SM: Design rotation speed

Claims (4)

設備に設置された回転機器において、前記回転機器が回転しているときの振動を検出する振動検出装置と、
前記振動検出装置が検出した振動を解析したときの複数のピーク周波数を抽出するピーク抽出部と、
前記ピーク抽出部が検出した前記複数のピーク周波数のそれぞれに対して、前記ピーク周波数を評価する評価指標を演算する評価演算部と、
前記評価演算部で演算された複数の評価指標に基づいて、前記回転機器の実回転数を演算する回転演算部と、を備え、
前記評価演算部は、前記複数のピーク周波数のそれぞれに対して、前記ピーク周波数よりも小さい複数の下側周波数と、前記ピーク周波数よりも大きい複数の上側周波数とを抽出し、前記複数の下側周波数及び前記複数の上側周波数に基づいて、前記ピーク周波数の急峻度及び前記ピーク周波数の対称度合を示す前記評価指標を演算する回転機器の回転数検出システム。 In the rotating equipment installed in the equipment, a vibration detection device that detects the vibration when the rotating equipment is rotating, and
A peak extraction unit that extracts a plurality of peak frequencies when the vibration detected by the vibration detection device is analyzed, and a peak extraction unit.
An evaluation calculation unit that calculates an evaluation index for evaluating the peak frequency for each of the plurality of peak frequencies detected by the peak extraction unit.
A rotation calculation unit that calculates the actual rotation speed of the rotating device based on a plurality of evaluation indexes calculated by the evaluation calculation unit is provided .
The evaluation calculation unit extracts a plurality of lower frequencies smaller than the peak frequency and a plurality of upper frequencies larger than the peak frequency for each of the plurality of peak frequencies, and extracts the plurality of lower frequencies. based on the frequency and the plurality of upper frequency, rotational speed detection system of the rotating device calculate the evaluation index indicating the steepness and symmetry degree of the peak frequency of the peak frequency. 前記回転演算部は、前記回転機器の設計回転数と、前記評価指標とに基づいて、前記回転機器の実回転数を演算する請求項１に記載の回転機器の回転数検出システム。 The rotation speed detection system for a rotating device according to claim 1, wherein the rotation calculation unit calculates the actual rotation speed of the rotating device based on the design rotation speed of the rotating device and the evaluation index. 前記回転演算部は、前記複数の評価指標のうち、最も評価指標が大きい評価指標を抽出し、前記抽出した評価指標に対応する前記ピーク周波数と、前記設計回転数に対応する設計周波数とに基づいて前記回転機器の実回転数を演算する請求項２に記載の回転機器の回転数検出システム。 The rotation calculation unit extracts the evaluation index having the largest evaluation index from the plurality of evaluation indexes, and is based on the peak frequency corresponding to the extracted evaluation index and the design frequency corresponding to the design rotation speed. The rotation speed detection system for a rotating device according to claim 2, wherein the actual rotation speed of the rotating device is calculated. 請求項１〜３のいずれかに記載された回転機器の回転数検出システムを備えた回転数検出装置。 A rotation speed detection device including the rotation speed detection system for the rotating device according to any one of claims 1 to 3.
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