JP5035729B2 - 張力測定装置 - Google Patents
張力測定装置 Download PDFInfo
- Publication number
- JP5035729B2 JP5035729B2 JP2008117010A JP2008117010A JP5035729B2 JP 5035729 B2 JP5035729 B2 JP 5035729B2 JP 2008117010 A JP2008117010 A JP 2008117010A JP 2008117010 A JP2008117010 A JP 2008117010A JP 5035729 B2 JP5035729 B2 JP 5035729B2
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- Japan
- Prior art keywords
- magnetic
- measuring device
- tension
- tension measuring
- magnetic field
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- 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.)
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/04—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands
- G01L5/10—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means
- G01L5/102—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring tension in flexible members, e.g. ropes, cables, wires, threads, belts or bands using electrical means using sensors located at a non-interrupted part of the flexible member
Description
Hsf≒Heff=Hex−Hdemag=Hex−N(M/μ0) (1)
ここで、μ0は真空の透磁率である。上記(1)式において、外部磁界が一定(Hex=const.)のとき、磁化がM→M+ΔMに変化したとすると、有効磁界すなわち表面近傍の空間磁界は、下記(2)式で表される分だけ変化することになる。
ΔHsf≒ΔHeff=(−N/μ0)ΔM (2)
この磁化の変化ΔMが応力によってもたらされたものとすると、反磁界係数Nがゼロでない限り、応力の変化が対象材表面近傍の空間磁界の変化ΔHsfに現れることになる。しかも、反磁界係数Nが大きいほど(図10を参照すれば、磁化される部位の長さが短くなるほど)、空間磁界の変化ΔHsfが大きく現れる。そこで、本発明は、磁化区間を短くして、反磁界Hdemagが大きくなるような構造とすることにより、応力による空間磁界の変化ΔHsfを大きく取り出して、高感度な張力測定ができるようにしたのである。その磁化区間の長さは、対象材の直径に対する比が3以下となるようにすることが望ましい。磁化区間の長さと対象材の直径との比が大きくなるほど反磁界係数Nひいては測定の感度が低下し(例えば、図10では、この比が5の場合は3の場合に対して反磁界係数Nが約1/2になる。)、この比が3を超えると実用上十分な感度を得にくくなるからである。
<載荷条件1>
・負荷荷重 :21.6〜156kN
・載荷方法 :手動
・繰返し回数 :5回
<載荷条件2>
・負荷荷重 :21.6〜200kN
・載荷方法 :正弦波形0.002Hz
・繰返し回数 :10回
2 磁化器
3 スペーサ
4 ホール素子
5 増幅器
6 ヨーク
6a、6b ヨーク片
7 永久磁石
11 引張試験機
12 エポキシストランド
13 ロードセル
16 アンカープレート
17 PCストランド
18 防食用パイプ
19 グラウト
20 定着具
23 ハンガーケーブル
24 橋脚
25 メインケーブル
26 橋桁
A 磁性体
Claims (6)
- 長尺の磁性体の一部を囲むように配され、その磁性体を長手方向に飽和漸近磁化範囲まで直流磁化する筒状の磁化器と、前記磁性体の磁化区間の長手方向中央部の近傍に配され、磁性体表面近傍の空間磁界強度を検出する磁気センサとを備え、前記磁気センサで検出される空間磁界強度に基づいて磁性体に作用する張力を測定するようにした張力測定装置。
- 前記磁気センサを、前記筒状の磁化器の内周側に配したことを特徴とする請求項1に記載の張力測定装置。
- 前記磁化器が、前記磁性体の長手方向に間隔をおいて互いに異なる磁極で対向する少なくとも一対の永久磁石を備えたものであることを特徴とする請求項1または2に記載の張力測定装置。
- 前記磁化器を周方向に複数に分割したことを特徴とする請求項3に記載の張力測定装置。
- 前記磁気センサとしてホール素子を用いたことを特徴とする請求項1乃至4のいずれかに記載の張力測定装置。
- 前記磁性体が複数の素線を撚り合わせた撚り線構造となっており、前記磁気センサを磁性体の周方向に複数配し、これらの各磁気センサの出力の平均値を空間磁界強度の検出値として用いるようにしたことを特徴とする請求項1乃至5のいずれかに記載の張力測定装置。
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008117010A JP5035729B2 (ja) | 2008-04-28 | 2008-04-28 | 張力測定装置 |
KR1020107017678A KR101484032B1 (ko) | 2008-04-28 | 2009-04-24 | 장력 측정 장치 |
EP09738749.2A EP2273246B1 (en) | 2008-04-28 | 2009-04-24 | Device for measuring tension |
ES09738749T ES2739573T3 (es) | 2008-04-28 | 2009-04-24 | Dispositivo para medir la tensión |
CN2009801149148A CN102016528B (zh) | 2008-04-28 | 2009-04-24 | 张力测量装置 |
US12/864,768 US8890516B2 (en) | 2008-04-28 | 2009-04-24 | Tension measurement apparatus |
PCT/JP2009/058135 WO2009133812A1 (ja) | 2008-04-28 | 2009-04-24 | 張力測定装置 |
HK11107211.5A HK1153265A1 (en) | 2008-04-28 | 2011-07-12 | Tension measurement apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008117010A JP5035729B2 (ja) | 2008-04-28 | 2008-04-28 | 張力測定装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2009265003A JP2009265003A (ja) | 2009-11-12 |
JP5035729B2 true JP5035729B2 (ja) | 2012-09-26 |
Family
ID=41255028
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2008117010A Active JP5035729B2 (ja) | 2008-04-28 | 2008-04-28 | 張力測定装置 |
Country Status (8)
Country | Link |
---|---|
US (1) | US8890516B2 (ja) |
EP (1) | EP2273246B1 (ja) |
JP (1) | JP5035729B2 (ja) |
KR (1) | KR101484032B1 (ja) |
CN (1) | CN102016528B (ja) |
ES (1) | ES2739573T3 (ja) |
HK (1) | HK1153265A1 (ja) |
WO (1) | WO2009133812A1 (ja) |
Cited By (3)
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JP2014134421A (ja) * | 2013-01-09 | 2014-07-24 | Sumitomo Denko Steel Wire Kk | Pc鋼材の張力表示器及びその表示方法 |
JP2014190854A (ja) * | 2013-03-27 | 2014-10-06 | Hitachi Metals Ltd | 磁化器 |
JP2017134013A (ja) * | 2016-01-29 | 2017-08-03 | 株式会社オンガエンジニアリング | 複合共振法による非接触応力測定方法及びその測定装置 |
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US9103131B2 (en) * | 2009-12-24 | 2015-08-11 | Vsl International Ag | Method and system for equally tensioning multiple strands |
NO335671B1 (no) * | 2010-04-23 | 2015-01-19 | Nmi Holding As | Anordning for demping av pendulære bevegelser og fremgangsmåte for anvendelse av samme |
DE102011081869A1 (de) * | 2011-08-31 | 2013-02-28 | Siemens Aktiengesellschaft | Messkopf für einen magnetoelastischen Sensor |
CN102519633B (zh) * | 2011-11-30 | 2014-07-16 | 浙江大学 | 磁弹磁电效应式应力监测装置 |
CH706135A2 (de) * | 2012-02-23 | 2013-08-30 | Polycontact Ag | Verfahren und Messanordnung zur Messung von mechanischen Spannungen in ferromagnetischen Werkstücken. |
US8919057B1 (en) * | 2012-05-28 | 2014-12-30 | Tracbeam, Llc | Stay-in-place insulated concrete forming system |
JP6010844B2 (ja) * | 2012-11-01 | 2016-10-19 | 住友電工スチールワイヤー株式会社 | 張力測定方法 |
CN103207041B (zh) * | 2013-05-08 | 2015-06-10 | 长安大学 | 压电式张拉力监测装置 |
JP6226131B2 (ja) * | 2014-02-21 | 2017-11-08 | 住友電工スチールワイヤー株式会社 | Pc鋼材の張力測定装置 |
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CN106092383A (zh) * | 2016-06-23 | 2016-11-09 | 南昌航空大学 | 磁弹索力测量方法及其可重构磁弹索力传感器 |
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CN107381285B (zh) * | 2017-08-27 | 2018-12-07 | 绍兴上虞华谊针纺有限公司 | 一种基于磁晶格的钢丝绳张力检测装置及方法 |
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US10816420B1 (en) | 2018-04-05 | 2020-10-27 | United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Non-invasive tension-measurement devices and methods |
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US11639879B2 (en) * | 2019-10-15 | 2023-05-02 | FUTEK Advanced Sensor Technology | Linear force sensor and method of use |
JP7446186B2 (ja) | 2020-09-04 | 2024-03-08 | 国立大学法人京都大学 | 張力測定方法 |
IT202000023185A1 (it) * | 2020-10-01 | 2022-04-01 | Aurora Sails | “sistema di ormeggio per imbarcazioni a pontili mobili e fissi e simili” |
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-
2008
- 2008-04-28 JP JP2008117010A patent/JP5035729B2/ja active Active
-
2009
- 2009-04-24 EP EP09738749.2A patent/EP2273246B1/en active Active
- 2009-04-24 WO PCT/JP2009/058135 patent/WO2009133812A1/ja active Application Filing
- 2009-04-24 CN CN2009801149148A patent/CN102016528B/zh active Active
- 2009-04-24 US US12/864,768 patent/US8890516B2/en active Active
- 2009-04-24 ES ES09738749T patent/ES2739573T3/es active Active
- 2009-04-24 KR KR1020107017678A patent/KR101484032B1/ko active IP Right Grant
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2011
- 2011-07-12 HK HK11107211.5A patent/HK1153265A1/xx unknown
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014134421A (ja) * | 2013-01-09 | 2014-07-24 | Sumitomo Denko Steel Wire Kk | Pc鋼材の張力表示器及びその表示方法 |
JP2014190854A (ja) * | 2013-03-27 | 2014-10-06 | Hitachi Metals Ltd | 磁化器 |
JP2017134013A (ja) * | 2016-01-29 | 2017-08-03 | 株式会社オンガエンジニアリング | 複合共振法による非接触応力測定方法及びその測定装置 |
Also Published As
Publication number | Publication date |
---|---|
EP2273246A1 (en) | 2011-01-12 |
HK1153265A1 (en) | 2012-03-23 |
KR101484032B1 (ko) | 2015-01-19 |
ES2739573T3 (es) | 2020-01-31 |
US20100315076A1 (en) | 2010-12-16 |
US8890516B2 (en) | 2014-11-18 |
EP2273246B1 (en) | 2019-07-17 |
CN102016528B (zh) | 2012-07-25 |
WO2009133812A1 (ja) | 2009-11-05 |
JP2009265003A (ja) | 2009-11-12 |
EP2273246A4 (en) | 2015-07-22 |
KR20110009078A (ko) | 2011-01-27 |
CN102016528A (zh) | 2011-04-13 |
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