JP2008018851A - Underframe structure of superconductive magnet - Google Patents

Underframe structure of superconductive magnet Download PDF

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JP2008018851A
JP2008018851A JP2006192624A JP2006192624A JP2008018851A JP 2008018851 A JP2008018851 A JP 2008018851A JP 2006192624 A JP2006192624 A JP 2006192624A JP 2006192624 A JP2006192624 A JP 2006192624A JP 2008018851 A JP2008018851 A JP 2008018851A
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underframe
superconducting magnet
frame
model
vibration
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Masaru Iwamatsu
勝 岩松
Hiroshi Kiyono
寛 清野
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Railway Technical Research Institute
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an underframe structure of a superconductive magnet for preventing resonance of a three-dimensional bending vibration mode of the superconductive magnet from existing in a traveling speed region, reducing weight of a superconductive magnet device, and improving mounting efficiency of actual equipment. <P>SOLUTION: In this underframe structure, three lateral beams 5, 6 and 7 of an underframe are arranged between side beams 3 and 4 of the underframe arranged along the superconductive magnets 1 and 2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、磁気浮上式鉄道の車両に搭載される超電導磁石の台枠構造に関するものである。   The present invention relates to a frame structure of a superconducting magnet mounted on a vehicle of a magnetic levitation railway.

かかる左右の超電導磁石の間には横梁を有する台枠が配置されるようになっている（下記特許文献１）。   A frame having a horizontal beam is arranged between the left and right superconducting magnets (Patent Document 1 below).

従来、超電導磁気浮上式鉄道用超電導磁石は走行中に地上コイルからの高調波磁場により振動を受ける。この振動は、超電導磁石のヘリウム温度領域に熱負荷を与え、加えて信頼性や耐久性を損なう原因となる。   Conventionally, superconducting magnetic levitation railway superconducting magnets are vibrated by a harmonic magnetic field from a ground coil during traveling. This vibration gives a heat load to the helium temperature region of the superconducting magnet, and in addition causes a deterioration in reliability and durability.

従来、実走行時の超電導磁石（ＳＣＭ）の振動特性を明らかにする目的で、ＳＣＭ−台車−ＳＣＭモデル（以下、実走行モデル）を作製して解析を行い、日の字浮上コイル模擬の電磁加振試験時と実走行時の振動特性の差異や外槽剛性や外槽−内槽間のばね定数を変化させた場合の特性等を明らかにしてきた（下記非特許文献１）。特に、日の字浮上コイルに起因した加振力で超電導磁石が振動する際の特性については、実験と解析の比較を行うことにより、その現象を説明することがほぼ可能なレベルとなった。その検討の中で、超電導磁石の左右振動については、超電導磁石自身の対策では不十分であり、他の検討ともあわせて、地上側コイルにおいて左右方向の加振力を低減する方向となっている。   Conventionally, for the purpose of clarifying the vibration characteristics of the superconducting magnet (SCM) during actual driving, an SCM-cart-SCM model (hereinafter referred to as an actual driving model) has been prepared and analyzed, and electromagnetic simulation of a Japanese character floating coil is performed. Differences in vibration characteristics during the vibration test and actual running, characteristics when the outer tank rigidity, and the spring constant between the outer tank and the inner tank are changed have been clarified (Non-Patent Document 1 below). In particular, the characteristics when the superconducting magnet vibrates due to the excitation force caused by the Japanese floating coil has reached a level where the phenomenon can be explained by comparing the experiment and analysis. In the study, for the left and right vibration of the superconducting magnet, the countermeasures of the superconducting magnet itself are insufficient, and together with other studies, the direction of the lateral excitation force is reduced in the ground side coil. .

以前、左右振動特性を向上させるための車両側の対策を検討する一環として、一つの方策として、台枠の横梁を４本から５本に変更し、台枠の左右剛性を向上させた場合のモデル（以下、５本梁モデルと呼ぶ、比較のため従来モデルは４本梁モデルと呼ぶこととする）を作製し、解析を実施した。その結果、左右振動について、従来の４本梁モデルと比較して振動が大きく低減されることがわかった（下記非特許文献２）。しかしながら、横梁を５本とすることは、左右振動低減に効果的であるが実際の機器配置等で困難な要素が大きい問題が残されている。また、台枠の横梁の本数を４本としたままで、横梁の剛性だけを変えたモデル（以下、改良４本梁モデルと呼ぶ）を作製して左右振動特性がどの程度向上するかも計算し、ある基準を定義することにより振動低減効果を見出す手法を提案し、振動低減対策のメリットが得られる可能性を見出した。
特開平１１−２３４８１０号公報 日本ＡＥＭ学会誌 Ｖｏｌ．１２，Ｎｏ．４（２００４）ｐｐ．２７２−２７８ 日本ＡＥＭ学会誌 Ｖｏｌ．１３，Ｎｏ．３（２００５）ｐｐ．２５２−２５７ Previously, as part of examining vehicle-side measures to improve left-right vibration characteristics, as one measure, when changing the horizontal beam of the underframe from 4 to 5 to improve the left-right rigidity of the underframe A model (hereinafter referred to as a five-beam model, for comparison purposes, the conventional model is referred to as a four-beam model) was prepared and analyzed. As a result, it was found that the left and right vibrations are greatly reduced compared to the conventional four beam model (Non-Patent Document 2 below). However, the use of five horizontal beams is effective in reducing left-right vibration, but there remains a problem that there are large factors that are difficult in actual device arrangement and the like. In addition, while maintaining the number of horizontal beams of the underframe as four, a model in which only the stiffness of the horizontal beam was changed (hereinafter referred to as an improved four-beam model) was also calculated to calculate how much the left-right vibration characteristics were improved. Then, we proposed a method to find the vibration reduction effect by defining a certain standard, and found the possibility of obtaining the benefits of vibration reduction measures.
Japanese Patent Laid-Open No. 11-234810 Japanese AEM Society Vol. 12, no. 4 (2004) pp. 272-278 Japanese AEM Society Vol. 13, no. 3 (2005) p. 252-257

しかしながら、台枠の横梁の本数を４本又は５本としても、実際の機器配置等で困難な要素がある。つまり、横梁が多いだけ、実際の機器配置が制限されることになり、実装効率が低減する。   However, even if the number of horizontal beams of the underframe is set to 4 or 5, there are elements that are difficult in actual device arrangement or the like. That is, as many horizontal beams are used, the actual device arrangement is limited, and the mounting efficiency is reduced.

本発明は、上記状況に鑑みて、超電導磁石の３次元曲げ振動モードの共振が走行速度領域内に存在しないようにするととともに、超電導磁石装置の重量を軽減し、実際の機器の実装効率を向上させることができる超電導磁石の台枠構造を提供することを目的とする。   In view of the above situation, the present invention prevents the resonance of the three-dimensional bending vibration mode of the superconducting magnet from being present in the traveling speed region, reduces the weight of the superconducting magnet device, and improves the mounting efficiency of actual equipment. An object of the present invention is to provide a frame structure of a superconducting magnet that can be made to operate.

本発明は、上記目的を達成するために、
〔１〕超電導磁石の台枠構造において、超電導磁石に沿って配置される台枠の側梁の間に３本の台枠の横梁を配置することを特徴とする。 In order to achieve the above object, the present invention provides
[1] In a frame structure of a superconducting magnet, three transverse beams of the frame are arranged between side beams of the frame arranged along the superconducting magnet.

〔２〕上記〔１〕記載の超電導磁石の台枠構造において、左右３次曲げ振動モードの超電導磁石の共振周波数を、１５４Ｈｚ超過へシフトすることを特徴とする。   [2] In the superconducting magnet frame structure according to [1], the resonance frequency of the superconducting magnet in the left and right third-order bending vibration mode is shifted to more than 154 Hz.

本発明によれば、左右３次曲げ振動モードの超電導磁石の共振周波数を、１５４Ｈｚ超過へシフトすることができる。   According to the present invention, the resonance frequency of the superconducting magnet in the left and right third-order bending vibration mode can be shifted to more than 154 Hz.

また、超電導磁石装置の重量を軽減し、実際の機器の実装効率を向上させることができる。   Further, the weight of the superconducting magnet device can be reduced, and the mounting efficiency of the actual device can be improved.

本発明の超電導磁石の台枠構造は、超電導磁石に沿って配置される台枠の側梁の間に３本の台枠の横梁を配置する。よって、超電導磁石の３次元曲げ振動モードの共振が走行速度領域内に存在しないようにするととともに、超電導磁石装置の重量を軽減し、実際の機器の実装効率を向上させることができる。   In the superconducting magnet frame structure of the present invention, three horizontal beams of the frame are arranged between the side beams of the frame arranged along the superconducting magnet. Therefore, the resonance of the three-dimensional bending vibration mode of the superconducting magnet does not exist in the traveling speed region, the weight of the superconducting magnet device can be reduced, and the mounting efficiency of the actual device can be improved.

以下、本発明の実施の形態について詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail.

図１は本発明の実施例を示す超電導磁石の台枠構造の平面模式図である。   FIG. 1 is a schematic plan view of a superconducting magnet frame structure showing an embodiment of the present invention.

これらの図において、１，２は左右に配置される超電導磁石、３，４は超電導磁石１，２に沿って配置される台枠の側梁、５，６，７は台枠の側梁３，４間に配置される台枠の横梁である。   In these drawings, 1 and 2 are superconducting magnets arranged on the left and right sides, 3 and 4 are side beams of the frame arranged along the superconducting magnets 1 and 2, and 5, 6 and 7 are side beams 3 of the frame. , 4 is a horizontal beam of the underframe disposed between.

今回のモデルは、台枠の横枠が５本である、つまり５本梁モデル（下記非特許文献２）を基本として、２本の台枠の横梁を削除し、かつ台枠の横梁の剛性を任意に変更できるように台枠の側梁と台枠の横梁の物性情報を独立に変更できるような改良を行った。なお、超電導磁石部分は改良していない。   This model has 5 horizontal frames of the underframe, that is, based on the 5-beam model (Non-patent Document 2 below), the two horizontal beams of the underframe are deleted, and the rigidity of the horizontal beams of the underframe The property information of the side beam of the frame and the horizontal beam of the frame can be changed independently. The superconducting magnet part is not improved.

図２はその超電導磁石の台枠構造の解析モデル外観図である。   FIG. 2 is an external view of the analytical model of the frame structure of the superconducting magnet.

解析モデル上の重量を表１に示す。   Table 1 shows the weight on the analysis model.

本発明の台枠の横梁の３本梁モデルは、従来からの４本梁モデルよりも約３０ｋｇ、５本梁モデルよりも約８０ｋｇの低減効果があることがわかる。 It can be seen that the three-beam model of the horizontal beam of the underframe of the present invention has a reduction effect of about 30 kg than the conventional four-beam model and about 80 kg than the five-beam model.

次に、解析結果について説明する。   Next, the analysis result will be described.

（Ａ）固有値解析結果
調和応答解析に先立ち、固有値解析を行った。日の字加振による調和応答を行った際に出現する可能性が高い振動モードをその５本梁モデルと比較して図３〜図６に示す。 (A) Eigenvalue analysis results Prior to the harmonic response analysis, eigenvalue analysis was performed. FIGS. 3 to 6 show vibration modes that are likely to appear when a harmonic response is performed by vibration of the Japanese character in comparison with the five beam model.

本発明の台枠の横梁の３本梁モデルの共振周波数はその５本梁モデルと比較して、数Ｈｚのみ下がる傾向にある。重量が軽くなることで周波数が上方にシフトするのと横梁の本数が少なくなることによる剛性の低下で周波数が下方にシフトするのを相殺していると推測される。特に、台枠の横梁の３本梁モデルの場合、時速５００ｋｍの加振周波数１５４Ｈｚ近傍においても、台枠の横梁の５本梁モデルに比して安定な状態にある。   The resonance frequency of the three-beam model of the transverse beam of the underframe of the present invention tends to decrease by only a few Hz compared to the five-beam model. It is presumed that the frequency shifts upward due to the weight being reduced and the frequency shifts downward due to a decrease in rigidity due to a decrease in the number of cross beams. In particular, in the case of the three beam model of the horizontal beam of the underframe, the state is more stable than the five beam model of the horizontal beam of the underframe even in the vicinity of an excitation frequency of 154 Hz at a speed of 500 km / h.

（Ｂ）調和応答解析結果
調和応答解析は以下のように行った。 (B) Harmonic response analysis result The harmonic response analysis was performed as follows.

荷重は、図７に示す通り軌道側外槽表面の超電導コイル位置中心に加えた。   The load was applied to the center position of the superconducting coil on the surface of the track-side outer tub as shown in FIG.

荷重条件は日の字浮上実走行とし、ｙ方向成分を明確にするために以下の荷重条件で解析した。   The load condition was a Japanese character floating actual running, and analysis was performed under the following load condition in order to clarify the y-direction component.

Ｆｙ＋Ｍｚ加振（両側加振）・・・ｙ方向成分に着目
Ｆｙ＋Ｍｙ加振（両側加振）・・・ｚ方向成分に着目
調和応答結果はＳＣＭ端部に着目した。（節点番号は、図１参照）
（１）Ｆｚ＋Ｍｙ加振
軌道側外槽表面の超電導コイル中心位置に、日の字実走行加振時のＦｚ及びＭｙ成分を荷重として入力した場合の解析結果を図８に示す。力の方向に合せてｚ方向に着目した。比較のために節点番号２５３における横梁の違いによる応答の結果を図９に示す。 Fy + Mz excitation (both sides excitation): focusing on y-direction component Fy + My excitation (both sides excitation): focusing on z-direction component The harmonic response results focused on the SCM end. (See Figure 1 for node numbers)
(1) Fz + My excitation FIG. 8 shows the analysis result when the Fz and My components at the time of the Japanese character actual running excitation are input as loads to the center position of the superconducting coil on the surface of the track-side outer tank. We focused on the z direction according to the direction of the force. For comparison, FIG. 9 shows the result of response due to the difference in the cross beam at the node number 253.

図８，図９より、以下のことがわかる。   8 and 9, the following can be understood.

Ｆｚ＋Ｍｙ加振の場合には、台枠の横梁の本数にかかわらず共振周波数並びに共振時の振動加速度には大きな差は認められない。   In the case of Fz + My excitation, no significant difference is recognized in the resonance frequency and the vibration acceleration at the time of resonance regardless of the number of horizontal beams of the frame.

（２）Ｆｙ＋Ｍｚ加振
軌道側外槽表面の超電導コイル中心位置に、日の字実走行加振時のＦｙ及びＭｚ成分を荷重として入力した場合の解析結果を図１０に示す。力の方向に合せてｙ方向に着目した。上記（１）と同様に、比較のために節点番号２５３における横梁の違いによる応答の結果を図１１に示す。 (2) Fy + Mz excitation FIG. 10 shows the analysis result when the Fy and Mz components at the time of the actual Japanese character traveling vibration are input as loads to the center position of the superconducting coil on the surface of the track-side outer tank. We focused on the y direction according to the direction of the force. Similarly to the above (1), the result of the response due to the difference in the cross beam at the node number 253 is shown in FIG. 11 for comparison.

図１０，図１１より、以下のことがわかる。   10 and 11, the following can be understood.

３本梁モデルは、５本梁モデルほどの振動抑制効果はないが、走行時に蒸発量の増大が顕著に認められる左右３次曲げ振動モード（逆位相）が走行速度領域内に存在しないなど有効性は高い。特に、３本梁モデルでは周波数１８０Ｈｚあたりに共振周波数をシフトしていることが明らかである。   The three-beam model is not as effective as the five-beam model, but it is effective in that there is no left-right third-order bending vibration mode (opposite phase) in the travel speed range where a significant increase in evaporation during travel is observed. The nature is high. In particular, it is clear that the resonance frequency is shifted around 180 Hz in the three-beam model.

台枠の横梁の３本梁モデルの場合でも、その５本梁モデルと同様に左右３次曲げ振動モードの腹となる部分に横梁が存在することにより、振動を抑制する効果が大きいことが今回の解析で明らかとなった。   Even in the case of a three-beam model of a horizontal beam of the underframe, as in the case of the five-beam model, the presence of the horizontal beam in the antinode of the left and right third-order bending vibration mode has a great effect of suppressing vibration. It became clear by analysis.

本発明の台枠の横梁の３本梁モデルの固有値解析及び調和応答解析結果から以下のことが明らかとなった。   From the eigenvalue analysis and harmonic response analysis results of the three-beam model of the transverse beam of the underframe of the present invention, the following became clear.

固有値解析の結果より、従来の台枠の横梁の４本梁モデル及び５本梁モデルと比較して上下方向が主体となる振動モードは周波数がほとんど変わらない。   As a result of the eigenvalue analysis, the frequency of the vibration mode mainly in the vertical direction is almost the same as that of the conventional 4-beam model and 5-beam model of the horizontal beam of the underframe.

左右方向が主体となる振動モードは台枠の横梁の５本梁モデルの共振周波数に比較的近い傾向にある。   The vibration mode mainly in the left-right direction tends to be relatively close to the resonance frequency of the five-beam model of the horizontal beam of the underframe.

日の字浮上実走行時の加振力による調和応答解析を行った。   Harmonic response analysis was performed by the excitation force during actual running on the Japanese character.

上下振動では、台枠の横梁の本数にかかわらず共振周波数並びに共振時の振動加速度には大きな差は認められない。   In vertical vibration, regardless of the number of horizontal beams in the underframe, there is no significant difference in the resonance frequency and the vibration acceleration at the time of resonance.

左右振動では、台枠の横梁の３本梁モデルは５本梁モデルほどの振動抑制効果はないが、実験時に蒸発量の増大が顕著に認められる左右３次曲げ振動モード（逆位相）の共振が走行速度領域内に存在しないなど有効性は高い。   In the left-right vibration, the three-beam model of the horizontal beam of the underframe is not as effective as the five-beam model, but the resonance of the left-right third-order bending vibration mode (reverse phase) in which the increase in evaporation is noticeable during the experiment. The effectiveness is high, such as being not in the travel speed range.

このように、振動低減に寄与している横梁の効果を明らかにすることができた。今回の解析したモデルでは、重量を低減できる可能性があるなど有効性は高いと考えられる。仮に、台枠の横梁の３本梁モデルの場合には、支持脚８，９は図１４に示すような配置が考えられる。   Thus, the effect of the cross beam contributing to vibration reduction could be clarified. The model analyzed this time is thought to be highly effective because it may reduce the weight. In the case of a three-beam model of a horizontal beam of the underframe, the support legs 8 and 9 can be arranged as shown in FIG.

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.

本発明の超電導磁石の台枠構造は、重量を軽減し、かつ実際の機器の実装効率を向上させることができる超電導磁石の台枠構造として利用可能である。   The superconducting magnet frame structure of the present invention can be used as a superconducting magnet frame structure capable of reducing the weight and improving the mounting efficiency of an actual device.

本発明の実施例を示す超電導磁石の台枠構造の平面模式図である。It is a plane schematic diagram of the frame structure of the superconducting magnet which shows the Example of this invention. 本発明の実施例を示す超電導磁石の台枠構造の解析モデル外観図である。It is an analysis model external view of the frame structure of the superconducting magnet which shows the Example of this invention. 台枠の固有値解析結果（その１）を示す図である。It is a figure which shows the eigenvalue analysis result (the 1) of a frame. 台枠の固有値解析結果（その２）を示す図である。It is a figure which shows the eigenvalue analysis result (the 2) of a frame. 台枠の固有値解析結果（その３）を示す図である。It is a figure which shows the eigenvalue analysis result (the 3) of a frame. 台枠の固有値解析結果（その４）を示す図である。It is a figure which shows the eigenvalue analysis result (the 4) of a frame. 台枠の荷重位置を示す図である。It is a figure which shows the load position of a frame. 本発明の超電導磁石の台枠の調和応答解析結果を示す図（その１）である（日の字浮上コイル加振）。It is a figure (the 1) which shows the harmonic response analysis result of the frame of the superconducting magnet of this invention (day-shaped floating coil excitation). 超電導磁石の台枠の横梁の本数の違いによる調和応答解析結果を示す図（その１）である（ノード２５３）。It is a figure (the 1st figure) which shows the harmonic response analysis result by the difference in the number of the horizontal beams of the frame of a superconducting magnet (node 253). 本発明の超電導磁石の台枠の調和応答解析結果を示す図（その２）である（日の字浮上コイル加振）。It is a figure (the 2) which shows the harmonic response analysis result of the frame of the superconducting magnet of this invention (day-shaped floating coil vibration). 超電導磁石の台枠の横梁の本数の違いによる調和応答解析結果を示す図（その２）である（ノード２５３）。It is a figure (the 2) which shows the harmonic response analysis result by the difference in the number of the horizontal beams of the frame of a superconducting magnet (node 253). 本発明の超電導磁石の台枠の横梁に支持脚がついた状態を示す模式図である。It is a schematic diagram which shows the state which the support leg attached to the cross beam of the frame of the superconducting magnet of this invention.

符号の説明Explanation of symbols

１，２ 超電導磁石
３，４ 超電導磁石に沿って配置される台枠の側梁
５，６，７ 台枠の側梁間に配置される台枠の横梁
８，９ 支持脚 1, 2 Superconducting magnets 3, 4 Side beams of frame placed along superconducting magnets 5, 6, 7 Horizontal beams of frame placed between side beams of frame 8, 9 Support legs

Claims (2)

超電導磁石に沿って配置される台枠の側梁の間に３本の台枠の横梁を配置することを特徴とする超電導磁石の台枠構造。   3. A superconducting magnet frame structure, wherein three frame horizontal beams are arranged between side beams of the frame arranged along the superconducting magnet. 請求項１記載の超電導磁石の台枠構造において、左右３次曲げ振動モードの超電導磁石の共振周波数を、１５４Ｈｚ超過へシフトすることを特徴とする超電導磁石の台枠構造。   2. The superconducting magnet frame structure according to claim 1, wherein the resonance frequency of the superconducting magnet in the left and right third-order bending vibration mode is shifted to more than 154 Hz.
JP2006192624A 2006-07-13 2006-07-13 Underframe structure of superconductive magnet Pending JP2008018851A (en)

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