Railway Vehicle Carbody Research Articles

3207 鉄道車両の床下機器の高減衰弾性支持による車体弾性振動低減 : 新幹線相当車両における数値的検討と実車加振試験(OS1-2 振動の低減,OS1 交通・物流システムの高速化、利便性、快適性の向上,オーガナイズド・セッション(OS))

In this paper, we investigated the effect of reduction of flexural vibration in a railway vehicle carbody by supporting underfloor equipment using high-damping elastic mounts. At first, a numerical model for finite element method (FEM) simulation was built to check the reduction capability of flexural vibration by this method. Then, we developed underfloor equipment units with elastic mounts and dummy weight, so as to be able to easily change the layout and the mass of underfloor equipment. And excitation tests of a Shinkansen-type test vehicle with the underfloor equipment units were conducted, and good vibration reduction performance was observed in the tests.

Damping Effect Due to Passengers on Flexural Vibrations of Railway Vehicle Carbodies and a Simplified Modeling to Develop Vibration Reduction Devises Utilizing the Effect of Passengers

Damping Effect Due to Passengers on Flexural Vibrations of Railway Vehicle Carbodies and a Simplified Modeling to Develop Vibration Reduction Devises Utilizing the Effect of Passengers

Reduction of Flexural Vibration of Railway Vehicle Carbody Utilizing Multi-Axis Deformation of Elastic Body

Recent railway vehicle carbodies are getting light-weight and structurally-simplified in terms of speed-up and energy saving. They often lead to increase the vertical flexural vibration of carbody which causes deterioration of the ride comfort. Therefore, it has been required to reduce the flexural vibration. An elastic body deforming both vertical and horizontal direction in response to a vertical input has possibility to be a simple but effective vibration absorber, according to previous studies. This paper proposes a new numerical model called “equivalent deformation model” which is able to represent the vibration of such elastic body. The validity of the model is verified through excitation tests for elastic circular cylindrical shells filled with water. And its vibration reduction effect is examined using 1:5 scale model of a Shinkansen. It is confirmed that the equivalent deformation model is applicable for designing an elastic circular cylindrical shell as a dynamic vibration absorber (elastic DVA). And the first-mode of bending vibration of the scale model can be successfully reduced by utilizing the elastic DVA.

1401 任意形状の弾性体による鉄道車両の車体振動低減の基礎的検討(OS1-1 振動・騒音の低減,OS1 交通・物流システムの高速化・利便性・快適性の向上,オーガナイズド・セッション(OS))

1401 任意形状の弾性体による鉄道車両の車体振動低減の基礎的検討(OS1-1 振動・騒音の低減,OS1 交通・物流システムの高速化・利便性・快適性の向上,オーガナイズド・セッション(OS))

234 アクティブマスダンパを用いた鉄道車両の車体弾性振動の多モード制振 : 小型化に向けた加振試験

234 アクティブマスダンパを用いた鉄道車両の車体弾性振動の多モード制振 : 小型化に向けた加振試験

249 乗客による鉄道車両の車体弾性振動低減効果

249 乗客による鉄道車両の車体弾性振動低減効果

435 床下機器の高減衰弾性支持による鉄道車両の車体弾性振動低減

This report presents a simple method to reduce flexural vibrations in a railway vehicle carbody just by supporting underfloor equipments using high-damping elastic mounts. Recent studies by the authors show that on-boarding passengers have large additional damping effect on the carbody flexural vibrations. Since a human as a elastic body itself has relatively large damping coefficient, we tried to simulate the additional damping effect of passengers by supporting underfloor equipments using high-damping elastic material. Some numerical studies are firstly carried out to check the feasibity of the idea using simple single degree of freedom and two degrees of freedom systems. Then, two types of elastic mounting devices are built for actual railway vehicle. A series of excitation tests are conducted in the rolling stock testing plant in the Railway Technical Research Institute (RTRI) using a commuter type test vehicle by applying those elastic mounting devices, and good vibration reduction performances are observred by the tests.

Multimodal Vibration Control of Elastic Vibration of Railway Vehicle Carbody Using Active Mass Dampers (A Method for Making and Updating Analytical Model and Fundamental Test Using Actual Vehicle)

Recent light-weighted and structurally-simplified railway vehicle carbodies tend to have complicated three dimensional elastic vibration modes and such vibration modes affect riding quality. In particular, it is known that the mode similar to the first mode of free supported elastic beam (“B mode”) and diagonal distortion mode (“D mode”) whose natural frequencies are around 10Hz are important because 10Hz is known to be a sensitive frequency range for human. In this paper, a method aiming at reducing the two modes (B mode and D mode) simultaneously by using two active mass dampers (AMDs) is suggested, and its feasibility is examined numerically and experimentally. A simple analytical model which can express complicated 3D elastic vibrations of carbody is introduced, and the way to obtain appropriate model parameters is proposed employing genetic algorithm (GA). Using the analytical model including bogies and AMD models, the capability to reduce those two target elastic modes is investigated. A stationary excitation test for a commuter type test vehicle is then carried out using an electro-dynamic exciter. The peaks corresponding to those two target modes are reduced successfully when AMDs are applied in the excitation test.

1111 変形する弾性体を用いた鉄道車両の車体振動低減(OS1-1 振動・騒音の低減,OS1 交通・物流システムの高速化・利便性・快適性の向上,オーガナイズド・セッション(OS))

1111 変形する弾性体を用いた鉄道車両の車体振動低減(OS1-1 振動・騒音の低減,OS1 交通・物流システムの高速化・利便性・快適性の向上,オーガナイズド・セッション(OS))

119 鉄道車両の車体上下弾性振動多モード制振用アクティブマスダンパの性能向上に関する検討

Recent light-weighted railway vehicle carbodies tend to have complicated three dimensional vertical elastic vibrations and such vibrations affect riding quality. In particular, the modes similar to the first bending mode of free supported elastic beam ("B mode") and diagonal distortion mode ("D mode") are important because natural frequencies of the two modes are around lOHz which is known to be a sensitive frequency range for human. A method to reduce the two elastic vibrations simultaneously with two active mass dampers (AMDs) was proposed in our previous researches and the validity was confirmed. As a next step, we are trying to develop a more practical AMD system with smaller and lighter actuators and more effective control law. In order to study the specification of actuator, such as maximum force and maximum stroke, a number of numerical simulations in time domain have to be carried out, therefore, we need a compact numerical model of a railway vehicle including AMDs. In this paper, examined a method to obtain reduced model with small DOF by using modal analysis is proposed, and the accuracy of the modal is examined by comparing with measurement results. By using the reduced model, the suitable specifications for the practical AMDs are studied numerically.

442 非構造部材を活用した鉄道車両の車体曲げ振動低減手法の検討

442 非構造部材を活用した鉄道車両の車体曲げ振動低減手法の検討

Reduction of bending vibration in railway vehicle carbodies using carbody–bogie dynamic interaction

This paper presents a theory to utilise the longitudinal vibration in bogies as a dynamic vibration absorber (DVA) to reduce the vertical bending vibration of railway vehicle carbodies in a simple and easy way. This study focuses upon the interaction between carbody vertical bending and bogie longitudinal motion, and the condition for tuning the natural frequency of the bogie motion to the target carbody vibration is derived theoretically using a very simple formula. Numerical and experimental studies are then outlined to validate the theory and formula, and the DVA effects are observed from both of them. The effectiveness of the method is also confirmed from a running test with a Shinkansen train on a commercial line.

63816 PARAMETER UPDATING OF THREE-DIMENSIONAL VIBRATION MODEL FOR RAILWAY VEHICLE CARBODIES USING MEASURED DATA(Railroad System Dynamics)

This paper proposes a method to determine model parameters of a numerical vibration model for railway vehicle carbodies by updating the model parameters using genetic algorithm (GA) together with measurement results. To analyze the three-dimensional elastic vibrations of recent light-weighted and structurally-simplified railway vehicle carbodies, a box-type analytical model was proposed. In this model, the carbodies are modeled as a box-type structure consisting of flexible plates and beams. These elements are connected each other by means of artificial springs. The model parameters such as the mass and stiffness properties of the beams and plates, and spring coefficients of the artificial springs must be specified to carry out a numerical calculation by the box-type model. The mass properties are relatively easy to determine, however, the choice of the stiffness parameters have not been well established, and the trial and error method is often adopted. Therefore, a reasonable and efficient methodology is strongly required. In this paper, an approach is proposed to determine the model parameters automatically using GA. In this method, the frequency response functions (FRFs) at the several points on the carbody are used to evaluate fitness between calculation and measurement results. By considering the FRFs at the points on the roof together with those for the floor, appropriate model data can be obtained both for FRFs and modal characteristics. Two different cases, a Shinkansen and commuter type vehicle, are employed as examples to evaluate the method. Good agreements between measurement and calculation results are observed for both cases and the validity of the proposed method is confirmed.

319 AMDを用いた鉄道車両の車体弾性振動の多モード振動制御(車両サスペンションおよび振動制御,OS-16 運動と振動の制御,総合テーマ「伝統を,未来へ!」)

The vertical elastic vibrations of railway vehicle carbodies are needed to reduce from the viewpoint of riding quality. The first bending mode and diagonal distortion mode are commonly observed almost all railway vehicle carbodies. The natural frequencies of the two modes exist around 10Hz which is known to be a sensitive frequency for human. In this paper, a vibration reduction method about the two modes by using active mass dampers is suggested. A stationary excitation test for an actual railway vehicle is conducted to confirm the feasibility of this method. As a result of the excitation test, two modes of above mentioned elastic vibration of the carbody are reduced successfully.

1202 AMDを用いた鉄道車両の車体弾性振動多モード制振による乗り心地改善(OS3-1 二輪車・鉄道・クレーンの制御,OS3 交通・物流システムの制御,オーガナイズド・セッション(OS))

The vertical elastic vibrations of railway vehicle carbodies are needed to reduce from the viewpoint of riding comfort. In particular, more than one elastic vibration modes having natural frequencies around 10Hz are known to be affect riding comfort. To reduce those elastic vibrations, we suggested a method by using active mass dampers (AMD). This paper describes the excitation test using a test vehicle in the rolling stock testing plant at RTRI to verify the effectiveness of the proposed method. Two linear actuators are applied as AMDs and the vibration reduction effect for major two elastic vibration modes and improvement of riding comfort are investigated.

3107 鉄道車両の側面衝撃圧縮強度特性評価(OS5-4 鉄道の安全・環境技術,OS5 安全・安心・防災・環境負荷低減,オーガナイズド・セッション(OS))

This paper describes a study of crush behaviour of railway vehicle carbodies under side collision accidents. As the first step for evaluating the carbody side strength, the authors had previously performed static compression tests using full-size partial carbodies, and performed FE analyses in order to verify empirical results. In this paper, we describe the results of dynamic compression tests and FE analysis under the same condition as the tests. The numerical result by FE analysis was consistent with the empirical results in terms of the load-time characteristics as well as their deformed shape. We constructed a method for the evaluation of the impact deformation behavior against loads from the side by using FE analysis.

540 水を充填した柔軟円筒による車体弾性振動の減衰効果(自動車・鉄道車両の制震,OS-3 ダンピング,総合テーマ「伝統を,未来へ!」)

540 水を充填した柔軟円筒による車体弾性振動の減衰効果(自動車・鉄道車両の制震,OS-3 ダンピング,総合テーマ「伝統を,未来へ!」)

Evaluation of Railway Vehicle Car Body Fatigue Life and Durability using a Multi-disciplinary Analysis Method

Evaluation of Railway Vehicle Car Body Fatigue Life and Durability using a Multi-disciplinary Analysis Method

Evaluation of Railway Vehicle Car Body Fatigue Life and Durability using a Multi-disciplinary Analysis Method

In this paper, a multi-disciplinary analysis method is proposed for evaluating the fatigue life and durability of railway vehicle car body structure under random dynamic loads. The proposed analysis involves the following steps: (1) Multibody dynamics Simulation (MBS) and Finite Element Analysis (FEA), which derives the load time histories for durability analysis, are performed to model the full vehicle complex system and simulate the rigid or flexible dynamic properties of the car body. (2) Car body durability analysis is involving a definition of the useful life and damage distribution of car body structure, including the stress or strain rainflow cycle counting, damage prediction, and remaining life estimation. (3) Multi-Disciplinary Optimization (MDO) method, an iterative procedure incorporated with several kinds of analysis results, is performed in a batch manner using some standard softwares, such as SIMPACK, ANSYS, FE-FATIGUE and modeFRONTIER. The methodology is also illustrated for handling conflicting problems of railway car body design for lightweight and fatigue requirements. Finally, the proposed methodology and its detailed steps are discussed using a locomotive car body structure. A comparison of analysis results with experimental test results and the necessary car body structure fatigue design considering full vehicle dynamic property are also detailed.

Suppression of vertical bending and rigid-body-mode vibration in railway vehicle car body by primary and secondary suspension control: Results of simulations and running tests using Shinkansen vehicle

To improve ride comfort in railway vehicles, the suppression of vertical bending vibration and rigid-body-mode vibration in the car body is essential. In this paper, a system is proposed that aims to reduce bending and rigid-body-mode vibration simultaneously by introducing damping control devices in the primary and secondary suspensions. The technique involves a control system of primary vertical dampers and air springs; the former are used to suppress the first bending mode vibration; the latter, to suppress the rigid-body-mode vibration. The results of both simulations and vehicle running tests on the Sanyo—Shinkansen line demonstrate that this system reduced vertical vibrations in the bogies and the car body using the sky-hook control theory. In the running tests in particular, the system reduced the vertical vibration acceleration PSD peak value in the first bending mode to almost 20 per cent and in the rigid body mode to almost 50 per cent compared with the case when the system was not used. As a result, the ride quality level LT (a widely used index of ride comfort in Japan) decreased by at least 3 dB, indicating greater ride comfort.