JP5275940B2 - Frequency variable fatigue testing equipment using electrodynamic vibration generator - Google Patents
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Description
本発明は、動電型振動発生装置を用いた周波数可変疲労試験装置に係り、特に、磁気浮上式鉄道用地上コイルのモールド樹脂材料（以下、モールド材と称する）を対象とした動電型振動発生装置を用いた周波数可変疲労試験装置に関するものである。 The present invention relates to a variable frequency fatigue testing apparatus using an electrodynamic vibration generator, and in particular, electrodynamic vibration for a molded resin material (hereinafter referred to as a mold material) of a magnetic levitation railway ground coil. The present invention relates to a frequency variable fatigue test apparatus using a generator.
従来、超電導磁気浮上式鉄道における地上コイルは、雨風にさらされる屋外に配置されるとともに、超電導磁石を搭載した高速列車通過時の電磁加振を受ける環境におかれている（下記特許文献１，２参照）。 Conventionally, a ground coil in a superconducting magnetic levitation railway is placed in an environment where it is placed outdoors exposed to rain and wind and is subjected to electromagnetic excitation when passing through a high-speed train equipped with a superconducting magnet (Patent Document 1, below). 2).
上記したように、長期の屋外使用が前提となる超電導磁気浮上式鉄道用地上コイルにとって、その地上コイルを支持すべきモールド材の強度評価は極めて重要であり、実機の機械的・電気的信頼性を如何にして立証するかが当面の重要な課題である。特に、高周波での加振環境は超電導磁気浮上式鉄道に固有であり、粘弾性挙動を示すモールド材としての高分子材料の疲労強度における周波数依存性の検証は、かかる地上コイルの強度設計に不可欠である。 As described above, for superconducting magnetically levitated railway ground coils that require long-term outdoor use, it is extremely important to evaluate the strength of the molding material that should support the ground coils, and the mechanical and electrical reliability of the actual machine How to prove this is an important issue for the time being. In particular, the high-frequency vibration environment is unique to superconducting magnetically levitated railways, and verification of the frequency dependence of the fatigue strength of polymer materials as viscoelastic behavior is essential for the strength design of such ground coils. It is.
一方、現在一般的に用いられている材料疲労試験装置としては、以下のようなものがある。
（１）ボールドウィンタイプ
不平衡振子を等速回転することにより遠心力を発生させ、左右の分力を板バネで拘束し上下力のみを利用した荷重一定平面曲げ疲労試験機である。
On the other hand, currently used material fatigue test apparatuses are as follows.
(1) Baldwin type This is a constant load plane bending fatigue testing machine that generates centrifugal force by rotating an unbalanced pendulum at a constant speed, restrains left and right component forces with leaf springs, and uses only vertical force.
従来の加振周波数は３０Ｈｚ固定であり、試験周波数が変えられない。そのため１００Ｈｚへの改造が試みられているが、構成部材が共振域の振動加速度に耐えられず、加振周波数を１００Ｈｚに変更することはこの種の疲労試験機では実現できる見通しがない。
（２）油圧タイプ
駆動源に油圧を利用した疲労試験機で、比較的大きな荷重が出力できる反面、樹脂片のように弾性率の小さい材料では、高周波での変位が追随しないため、高周波では高い応力が加えられない。
（３）リニアモータ駆動タイプ
駆動源にリニアモータを利用した電動疲労試験機であり、原理上高周波が出力し易いが、樹脂片のように弾性率の小さい材料では、油圧と同様に高周波での変位が追随せず、高い応力を加えることができない（上記非特許文献１参照）。
The conventional excitation frequency is fixed at 30 Hz, and the test frequency cannot be changed. Therefore, remodeling to 100 Hz has been attempted, but the structural members cannot withstand vibration acceleration in the resonance region, and changing the excitation frequency to 100 Hz is not expected to be realized with this type of fatigue testing machine.
(2) Hydraulic type Fatigue testing machine that uses hydraulic pressure as the drive source can output a relatively large load. On the other hand, a material with a low elastic modulus such as a resin piece does not follow high-frequency displacement, so it is high at high frequency. No stress is applied.
(3) Linear motor drive type This is an electric fatigue testing machine that uses a linear motor as the drive source. In principle, high frequency is easily output. However, in the case of a material with a low elastic modulus such as a resin piece, The displacement does not follow and high stress cannot be applied (see Non-Patent Document 1 above).
本発明は、上記状況に鑑みて、超電導磁気浮上式鉄道用地上コイルのモールド材を対象に、駆動源として動電型振動発生装置を用いて材料試験片に曲げ疲労負荷を与えて疲労試験を実施する、動電型振動発生装置を用いた周波数可変疲労試験装置を提供することを目的とする。 In view of the above situation, the present invention applies a fatigue test by applying a bending fatigue load to a material specimen using an electrodynamic vibration generator as a driving source for a molding material of a superconducting magnetic levitation railway ground coil. An object of the present invention is to provide a variable frequency fatigue testing apparatus using an electrodynamic vibration generator.
本発明は、上記目的を達成するために、
〔１〕動電型振動発生装置を用いた周波数可変疲労試験装置において、固定側に配置される励磁コイル（２，３）による磁場環境に置かれた可動部コイル（４）に任意の周波数からなる電流を通電し、上部に配置される可動部（５）の上下方向の直線的な振動を発生させる動電型振動発生装置本体（１，１２、２１）と、前記可動部（５）の上方に配置される磁気浮上式鉄道用地上コイルのモールド材からなる試験片（１６，２５）の両側に構成されるリンク機構（１７）を有する試験片加振用治具（１８）とを備え、前記可動部（５）の駆動により前記リンク機構（１７）の両端の２点が固定され中央部２点のみが駆動するため、前記試験片（１６，２５）には前記リンク機構（１７）を有する試験片加振用治具（１８）により曲げ疲労負荷を与えることを特徴とする。
In order to achieve the above object, the present invention provides
[1] In a variable frequency fatigue testing apparatus using an electrodynamic vibration generator, an arbitrary frequency can be applied to a movable part coil (4) placed in a magnetic field environment by excitation coils (2, 3) arranged on a fixed side. An electrodynamic vibration generator main body (1, 12, 21) for generating a vertical vibration of the movable part (5) disposed in the upper part and the movable part (5) comprising a test piece and the pressurizing mutabilis jig (18) having both sides formed linkage test piece formed from the mold material maglev terrestrial coil disposed upward (16, 25) (17) Since the two points at both ends of the link mechanism (17) are fixed by driving the movable part (5) and only the two central parts are driven, the link mechanism (17) is provided on the test piece (16, 25). Bending fatigue resistance due to the test piece vibration jig (18) having Characterized in that it give.
〔２〕上記〔１〕記載の動電型振動発生装置を用いた周波数可変疲労試験装置において、前記可動部（５）に振動加速度計（１５，２３）を備えることを特徴とする。
〔３〕上記〔１〕記載の動電型振動発生装置を用いた周波数可変疲労試験装置において、前記可動部（５）と前記試験片加振用治具（１８）との間に荷重変換器（２０，２４）を備えることを特徴とする。
[ 2 ] A variable frequency fatigue test apparatus using the electrodynamic vibration generator according to [1] above, wherein the movable part (5) includes a vibration accelerometer (15, 23).
[ 3 ] In the frequency variable fatigue test apparatus using the electrodynamic vibration generator described in [1] above, a load converter is provided between the movable part (5) and the test piece vibration jig (18). (20, 24).
本発明によれば、超電導磁気浮上式鉄道用地上コイルのモールド材の試験片を任意の周波数で加振することができるので、疲労強度における周波数依存性の検証を行い、地上コイルの強度設計に資することができる。 According to the present invention, the test piece of the ground material for the superconducting magnetic levitation railway ground coil can be vibrated at an arbitrary frequency, so the frequency dependence of the fatigue strength is verified and the strength of the ground coil is designed. Can contribute.
本発明の動電型振動発生装置を用いた周波数可変疲労試験装置は、固定側に配置される励磁コイル（２，３）による磁場環境に置かれた可動部コイル（４）に任意の周波数からなる電流を通電し、上部に配置される可動部（５）の上下方向の直線的な振動を発生させる動電型振動発生装置本体（１，１２、２１）と、前記可動部（５）の上方に配置される磁気浮上式鉄道用地上コイルのモールド材からなる試験片（１６，２５）の両側に構成されるリンク機構（１７）を有する試験片加振用治具（１８）とを備え、前記可動部（５）の駆動により前記リンク機構（１７）の両端の２点が固定され中央部２点のみが駆動するため、前記試験片（１６，２５）には前記リンク機構（１７）を有する試験片加振用治具（１８）により曲げ疲労負荷を与える。 The variable frequency fatigue testing apparatus using the electrodynamic vibration generator of the present invention can be applied to the movable part coil (4) placed in the magnetic field environment by the exciting coils (2, 3) arranged on the fixed side from any frequency. An electrodynamic vibration generator main body (1, 12, 21) for generating a vertical vibration of the movable part (5) disposed in the upper part and the movable part (5) comprising a test piece and the pressurizing mutabilis jig (18) having both sides formed linkage test piece formed from the mold material maglev terrestrial coil disposed upward (16, 25) (17) Since the two points at both ends of the link mechanism (17) are fixed by driving the movable part (5) and only the two central parts are driven, the link mechanism (17) is provided on the test piece (16, 25). Bending fatigue load with a test piece vibration jig (18) having Obtain.
以下、本発明の実施の形態について詳細に説明する。
図１は本発明に係る動電型振動発生装置の動作原理を示す模式図であり、図１（ａ）は可動部コイルに印加される電流波形を示し、図１（ｂ）は動電型振動発生装置の電磁力による力の発生原理を示す模式図である。
図１において、１は振動発生装置本体、２は下部励磁コイル、３は上部励磁コイル、４は任意の電流を通電することができる可動部コイル、５は可動部である。
Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is a schematic diagram showing an operation principle of an electrodynamic vibration generator according to the present invention, FIG. 1 (a) shows a current waveform applied to a movable part coil, and FIG. 1 (b) shows an electrodynamic type. It is a schematic diagram which shows the generation principle of the force by the electromagnetic force of a vibration generator.
In FIG. 1, 1 is a vibration generator main body, 2 is a lower excitation coil, 3 is an upper excitation coil, 4 is a movable part coil capable of supplying an arbitrary current, and 5 is a movable part.
図１（ａ）に示すような波形の電流が可動部コイル４に供給されると、プラス電流の場合は可動部５が上昇し、マイナス電流の場合は可動部５が下降する。つまり、正弦波が供給されると、可動部５は上下方向に直線的に振動することになる。なお、可動部コイル４に供給される周波数は可変にすることができる。
図２は本発明の実施例を示す動電型振動発生装置を用いた磁気浮上式鉄道用地上コイルのモールド材の疲労試験装置の模式図である。
When a current having a waveform as shown in FIG. 1A is supplied to the movable part coil 4, the movable part 5 rises in the case of a positive current, and the movable part 5 falls in the case of a negative current. That is, when a sine wave is supplied, the movable part 5 vibrates linearly in the up and down direction. In addition, the frequency supplied to the movable part coil 4 can be made variable.
FIG. 2 is a schematic view of a fatigue test apparatus for a magnetic levitation railway ground coil mold material using an electrodynamic vibration generator according to an embodiment of the present invention.
この図において、１１は動電型振動発生装置の固定部、１２は振動発生装置本体、１３は動電型振動発生装置の固定部１１と振動発生装置本体１２との間に配置される防振バネ、１４は振動発生装置本体１２の上部に配置される可動部、１５は可動部１４に搭載される振動加速度計、１６は磁気浮上式鉄道用地上コイルのモールド材からなる試験片、１８はリンク機構１７を有する試験片加振用治具、１９は試験片１６に貼付けられるひずみゲージであり、事前に加振条件を標定するために使用する。２０は可動部１４と試験片加振用治具１８との連結部に配置される荷重変換器であり、試験片１６に加わる荷重を一定に制御するためのものである。 In this figure, 11 is a fixed part of the electrodynamic vibration generator, 12 is a vibration generator body, and 13 is a vibration isolator disposed between the fixed part 11 of the electrodynamic vibration generator and the vibration generator body 12. A spring, 14 is a movable part arranged on the upper part of the vibration generator main body 12, 15 is a vibration accelerometer mounted on the movable part 14, 16 is a test piece made of a molded material of a magnetic levitation railway ground coil, and 18 is A test piece vibration jig 19 having a link mechanism 17 is a strain gauge affixed to the test piece 16, and is used to preliminarily determine the vibration conditions. Reference numeral 20 denotes a load converter disposed at a connecting portion between the movable portion 14 and the test piece vibration jig 18 for controlling the load applied to the test piece 16 to be constant.
動電型振動発生装置の駆動により、可動部１４は上下方向に直線的に振動をする。すると、リンク機構１７を有する試験片加振用治具１８にその振動は伝達され、試験片１６に曲げ疲労負荷を与えることができ、材料疲労試験を行うことができる。
図３は本発明の実施例を示す動電型振動発生装置の設定荷重に対する試験片の発生ひずみの特性図であり、図３（ａ）は３０Ｈｚ、図３（ｂ）は７０Ｈｚ、図３（ｃ）は１００Ｈｚ、図３（ｄ）は１４０Ｈｚにてそれぞれ駆動させた場合の設定荷重（Ｎ）に対する試験片のひずみ（μ）特性図である。
By driving the electrodynamic vibration generator, the movable portion 14 vibrates linearly in the vertical direction. Then, the vibration is transmitted to the test piece vibration jig 18 having the link mechanism 17, and a bending fatigue load can be applied to the test piece 16, and a material fatigue test can be performed.
FIG. 3 is a characteristic diagram of the generated strain of the test piece with respect to the set load of the electrodynamic vibration generator according to the embodiment of the present invention. FIG. 3 (a) is 30 Hz, FIG. 3 (b) is 70 Hz, and FIG. FIG. 3C is a strain (μ) characteristic diagram of the test piece with respect to a set load (N) when driven at 100 Hz and FIG. 3D, respectively.
これらの図から、各周波数における荷重に対するひずみは線形性を有していることがわかる。つまり、本発明の動電型振動発生装置が周波数可変疲労試験装置として有効に機能することが分かる。
図４は本発明の動電型振動発生装置を用いた磁気浮上式鉄道用地上コイルのモールド材の疲労試験装置を示す図面代用写真である。
From these figures, it can be seen that the strain with respect to the load at each frequency has linearity. That is, it can be seen that the electrodynamic vibration generator of the present invention functions effectively as a frequency variable fatigue test apparatus.
FIG. 4 is a drawing-substituting photograph showing a fatigue test apparatus for a magnetic levitation railway ground coil mold material using the electrodynamic vibration generator of the present invention.
この図において、２１は振動発生装置本体、２２は可動部、２３は可動部２２に搭載される振動加速度計、２４は荷重変換器、２５は磁気浮上式鉄道用地上コイルのモールド材からなる試験片である。
このように構成したので、動電型振動発生装置を用いて試験片加振用治具を介して材料試験片に曲げ疲労負荷を与えることができ、疲労強度における周波数依存性の検証を行い、地上コイルの強度設計に役立てることができる。
In this figure, 21 is a vibration generator main body, 22 is a movable part, 23 is a vibration accelerometer mounted on the movable part 22, 24 is a load transducer, and 25 is a test made of a molded material of a magnetic levitation railway ground coil. It is a piece.
Because it is configured in this way, bending fatigue load can be applied to the material test piece via the test piece vibration jig using the electrodynamic vibration generator, and the frequency dependence in the fatigue strength is verified, It can be used for the strength design of the ground coil.
なお、本発明は上記実施例に限定されるものではなく、本発明の趣旨に基づき種々の変形が可能であり、これらを本発明の範囲から排除するものではない。 In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.
本発明の動電型振動発生装置を用いた周波数可変疲労試験装置は、超電導磁気浮上式鉄道用地上コイルのモールド材を対象に、疲労試験時の駆動源として動電型振動発生装置を用いてリンク機構を有する試験片加振用治具を介して材料試験片に曲げ疲労負荷を与えることができる疲労試験装置として利用可能である。 The variable frequency fatigue test apparatus using the electrodynamic vibration generator of the present invention is directed to a superconducting magnetic levitation railway ground coil mold material, using the electrodynamic vibration generator as a drive source during a fatigue test. The present invention can be used as a fatigue test apparatus capable of applying a bending fatigue load to a material test piece via a test piece vibration jig having a link mechanism.
１，１２，２１ 振動発生装置本体
２ 下部励磁コイル
３ 上部励磁コイル
４ 可動部コイル
５，１４，２２ 可動部
１１ 固定部
１３ 防振バネ
１５，２３ 振動加速度計
１６，２５ 磁気浮上式鉄道用地上コイルのモールド材からなる試験片
１７ リンク機構
１８ 試験片加振用治具
１９ ひずみゲージ
２０，２４ 荷重変換器
DESCRIPTION OF SYMBOLS 1, 12, 21 Vibration generator main body 2 Lower excitation coil 3 Upper excitation coil 4 Movable part coil 5, 14, 22 Movable part 11 Fixed part 13 Anti-vibration spring 15, 23 Vibration accelerometer 16, 25 Magnetically levitated railway ground Test piece made of coil molding material 17 Link mechanism 18 Test piece vibration jig 19 Strain gauge 20, 24 Load transducer
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| CN112539991A (en) * | 2020-11-11 | 2021-03-23 | 贵州天义电器有限责任公司 | Simulation reed elasticity fatigue test device |
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