Railway Vehicle Carbody Research Articles

シェルモデルを用いた鉄道車体弾性振動解析 : 屋根-側結合部分の剛性が振動特性に及ぼす影響(<特集>D&D 2008)

シェルモデルを用いた鉄道車体弾性振動解析 : 屋根-側結合部分の剛性が振動特性に及ぼす影響(<特集>D&D 2008)

3316 隣接車両の運動が車体曲げ振動に与える影響について(OS2-2:エレベータ・鉄道のダイナミクス,OS2:交通・物流システムのダイナミクス,オーガナイズド・セッション(OS),第18回交通・物流部門大会(TRANSLOG2009))

3316 隣接車両の運動が車体曲げ振動に与える影響について(OS2-2:エレベータ・鉄道のダイナミクス,OS2:交通・物流システムのダイナミクス,オーガナイズド・セッション(OS),第18回交通・物流部門大会(TRANSLOG2009))

Improving the Rigidity of Railway Vehicle Carbodies Using Non-Structural Members

For this study, a rigidity test car was designed and manufactured to enable investigation of how non-structural members in the carbody influence the rigidity and vibration characteristics of a commuter-type railway vehicle. Reinforcing beams and pillars designed for easy attachment and removal were installed on the ceiling, the side panels and the floor. The authors performed static load and excitation tests, and the results showed that the non-structural members, as well as the main (outer) body structures, affected the equivalent rigidity, natural frequencies, vibration shapes and response accelerations of the carbody.

Modal Analysis of Railway Vehicle Carbodies Using a Linear Prediction Model

This paper reports on a study regarding modal property identification for railway vehicles using a linear prediction model. The relationship between input (excitation force or axlebox acceleration) and output (carbody acceleration) of an actual railway vehicle obtained by stationary or running tests is expressed by means of an ARX (Auto-Regressive eXogenious) model, and the procedure for the extraction of modal properties is described in detail. Determination of an appropriate model order (i.e., the order of the prediction coefficients in the ARX model) is specifically discussed from the viewpoint of practical use. The implementation of average estimation errors for two different parts of the analyzed data is proposed, and their effectiveness in determining the model order is evaluated. Suitability for the MIMO (multiple-input multipleoutput) problem using the ARX model is also described. It is shown that detailed modal characteristics can be successfully identified using the proposed method from measured data for both stationary and running tests.

261 箱形構造物としての鉄道車両の車体上下弾性振動解析 : 車体側面の曲率を考慮した曲がりはりの導入

An analytical method to treat flexural vibration of railway vehicle carbody is investigated. From several measurement results for actual railway vehicles, it has been found that the relative vertical displacement between roof and floor couples strongly with lateral deformation of side panels. An analytical model, therefore, has to express such coupling effect correctly. A curved beam, in which circumferential and radial deformation couples each other, is introduced to express the deformation of side pillar in this study. The strain energy of the curved beam is derived based on a shell theory, and some numerical calculations are carried out. A straight and curved beam coupled system is proposed as a reduced system representing side panel of a railway vehicle carbody. Numerical result shows that the beam system can express the coupling effect between roof-floor relative vertical displacement and side panel lateral deformation successfully.

565 内部骨組を活用した鉄道車両の車体剛性向上手法の検討 : 補強部材の軽量化による実用性の向上

565 内部骨組を活用した鉄道車両の車体剛性向上手法の検討 : 補強部材の軽量化による実用性の向上

鉄道車両の振動モード解析への線形予測モデルの適用(<特集>D&D 2008)

鉄道車両の振動モード解析への線形予測モデルの適用(<特集>D&D 2008)

Bending Vibration Suppression of Railway Vehicle Carbody with Piezoelectric Elements (Experimental Results of Excitation Tests with a Commuter Car)

Bending Vibration Suppression of Railway Vehicle Carbody with Piezoelectric Elements (Experimental Results of Excitation Tests with a Commuter Car)

468 非構造部材を活用した鉄道車両の車体剛性向上手法の検討

468 非構造部材を活用した鉄道車両の車体剛性向上手法の検討

Vibration Suppression of Railway Vehicle Carbody with Piezoelectric Elements (A Study by Using a Scale Model of Shinkansen)

Piezoelectric elements, which are electrically connected to external shunt circuits, are introduced to suppress bending vibration of a scale model of a railway vehicle. The authors proposed two types of shunt circuits aiming at practical use. One circuit is equivalent to an inductor and a resistor in series, and the other a negative capacitor and a resistor, and both circuits are designed for use under conditions of large vibration amplitude that causes high voltage generated by the elements. Results of excitation tests show that the first bending mode of the scale model can be suppressed successfully. Moreover, the circuit including the negative capacitor can also reduce vibration associated with higher eigen modes simultaneously with the first mode.

2208 静的荷重試験結果を活用した鉄道車両用車体のFEM振動解析モデル構築に関する研究(シミュレーション技術,OS3 交通・物流システムのダイナミクスと制御)

2208 静的荷重試験結果を活用した鉄道車両用車体のFEM振動解析モデル構築に関する研究(シミュレーション技術,OS3 交通・物流システムのダイナミクスと制御)

Numerical analysis of three-dimensional flexural vibration of railway vehicle car body

An analytical method to investigate the three-dimensional (3D) flexural vibration of railway vehicle car bodies is presented in this article. In the method, a car body is modeled as a box-type structure consisting of plates and beams. The condition to connect components is satisfied by introducing artificial springs at their joints. The detailed analytical procedure is described. Some numerical calculations are carried out employing a commuter vehicle, which has a stainless steel car body, as an example. The numerical results are compared with the measured data to evaluate the validity of the model. Although the target vehicle has complicated mode shapes, it is shown that the analytical model can express such 3D vibration mode shapes successfully. It is also demonstrated that a good agreement is observed between the calculation results by the above method and the measured data for both stationary excitation and running test.

419 乗客による鉄道車両の車体弾性振動への減衰付与効果

419 乗客による鉄道車両の車体弾性振動への減衰付与効果

416 ピエゾ素子を用いた鉄道車両の車体曲げ振動低減 : 通勤形車両による実車加振試験結果

近年の鉄道車両は軽量化や構造の簡素化が進められており,高速化による速達性の向上,省エネルギ,低コスト化,地盤振動低減などに貢献している一方,それにともなって車体の上下方向の曲げ振動(以下,車体曲げ振動)が顕著に発生する傾向がある.このような車体曲げ振動は人間が敏感な10Hz付近の周波数に発生することが多く,乗り心地向上の観点から低減対策が求められる事例が増えている.これに対して筆者らは,ピエゾ素子とこれに接続した外部電気回路(以下,分岐回路)を組み合わせた制振手法に注目し,鉄道車両の車体曲げ振動低減への適用をめざして開発を行っている.本報告では,素子の車体への具体的な取付方法の検討,および実用を考慮した分岐回路の設計を行い,在来線通勤車両相当の実車体を用いて定置加振試験を行った結果について報告する. ピエゾ素子の車体への取付方法としては,素子をあらかじめアルミブロック製治具に接着したユニットとし,車体にはボルトにより車体に固定する方法により,脱着可能な構成を採用した.分岐回路は,インダクタと抵抗の直列接続(L-R回路)および負の値を持つキャパシタと抵抗(負性C-R)回路を用い,L-R回路は受動素子のみで構成できる巻線コイルにより,また負性C-R回路については,特性の一部を電子回路を用いて仮想的に実現する手法により実装した 定置加振試験は,在来線通勤車両相当の軽量ステンレス車体(図A1)を,動電型加振器により床下から上下方向に加振することにより実施した.質量約10.7tの車体に対して,58kg(質量比0.55%)の制振ユニットを車体に取付けて行った定置加振試験結果を,図A2に示す.グラフの横軸は周波数,縦軸は単位加振力あたりの床上中央付近における加速度の周波数応答であり,両者とも素子による制振効果が現れない電極短絡時の固有振動数における値で正規化している.黒線が電極短絡時,濃灰線,薄灰色線はそれぞれ分岐回路としてL-R回路,負性C-R回路を用いた場合の結果である.固有振動モードに対応する周波数応答のピークが20〜30%程度低減しており,実車両においても振動低減効果が得られることが確認できた.

511 複雑な振動形状を持つ鉄道車両のFEM 解析

511 複雑な振動形状を持つ鉄道車両のFEM 解析

306 鉄道車両の車体弾性振動低減のためのダンパ内蔵スタンションポールの開発

306 鉄道車両の車体弾性振動低減のためのダンパ内蔵スタンションポールの開発

1715 圧電素子を用いた鉄道車両の制振に関する研究 : 制振性能向上を目指した素子設置方法(J08-4 振動・騒音制御,適応構造,J08 知的材料・構造システム)

This paper describes the way to apply the piezoelectric elements for the vibration suppression of actual railway vehicle carbody. To suppress the bending vibration of the carbody, the amount of electrical energy generated by piezoelectric elements should be increased. We designed several kinds of removable piezoelectric dampers. Afterwards, we carried out the excitation tests by putting the dampers to the carbody. From the experiment results, the most effective damper for the vibration suppression was identified by evaluating the voltage generated by each piezoelectric damper.

Suppression of Bending Vibration of Railway Vehicle Carbody by using Carbody-Truck Interaction

This paper presents a method to suppress the vertical bending vibration of railway vehicle carbody by using carbody-truck (or bogie) interaction. It is shown from the running test result of an actual Shinkansen vehicle that the bending vibration can greatly be reduced when the rigidity of carbody-truck connecting elements in the longitudinal direction (i.e., rubber bush rigidity of traction links and anti-yaw dampers) Kx is set at the optimum value. The mechanism of the effect to reduce such vibration is analyzed theoretically. As a result, it is found that the truck frames and wheelsets act as dynamic vibration absorbers against the bending vibration of carbody. A formula to adjust Kx to its suitable value is derived. The accuracy and validity of the formula is evaluated numerically.

454 ピエゾ素子を用いた受動的制振法による鉄道車両の車体弾性振動低減 : 実用性を考慮した素子の取付方法の検討

454 ピエゾ素子を用いた受動的制振法による鉄道車両の車体弾性振動低減 : 実用性を考慮した素子の取付方法の検討

1204 鉄道車両の車体弾性振動低減のためのピエゾ素子の適切な取付手法の検討

1204 鉄道車両の車体弾性振動低減のためのピエゾ素子の適切な取付手法の検討