Simulation Research on Electromagnetic Shielding Characteristics of Carbon Fiber Car Body for Railway Vehicles

Zhao, Ta; Teng, Wanxiu; Hong-hai, Hao; Sun, Ping; Liu, Yunqing

doi:10.1016/j.procs.2019.06.085

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…Further discussions about the advantages and disadvantages of light vehicle bodies can be found in. [7][8][9][10][11][12] To overcome the disadvantages of using lightweight materials in car bodies, the most practical solution is to employ effective suspension/dampers, as illustrated in Section 2.2. Moreover, changing the design and materials can also be a viable practical solution, especially if it increases the bending natural frequency by more than 10 Hz.…”

Section: Train Design and Modal Identificationmentioning

confidence: 99%

A combined review of vibration control strategies for high-speed trains and railway infrastructures: Challenges and solutions

Zhang

Kordestani

Shadabfar

2022

Journal of Low Frequency Noise, Vibration and Active Control

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People use trains as a means of transportation to travel to various nearby and distant destinations, resulting in an increasing amount of time spent inside such vehicles. Consequently, railway transportation sectors are focusing significantly more on enhancing passengers’ demand and level of satisfaction, including but not limited to high-speed travel, safety, and riding comfort. This paper provides a state-of-the-art review of available solutions for reducing undesired vibrations that have a substantial impact on improving the critical velocity limits of trains, maintaining the quality of riding comfort, and resolving safety concerns. In this regard, the solutions proposed for train vibration control are divided into two main categories: direct and indirect solutions. The direct solutions are those methods that are applied directly to trains’ bodies or bogies to attenuate the undesired vibrations, for example, improving the suspension/damper system, implementing active/semi-active control strategies, or applying various carriage optimization design modifications. Indirect solutions, on the other hand, are those that could indirectly affect trains’ vibrations, for example, controlling vibrations in railway bridge structures during train passages. Since the identification of vibration characteristics is assumed to be the first step in choosing proper solutions, particularly for active or semi-active control implementations, this review has examined the literature pertinent to modal identification of trains and railway infrastructures. Additionally, despite the installation of dampers between the bogie and suspension, the train’s equation of motion, and consequently, the vibration control of the bogie, has relied on the sky-hook model for decades. The fundamental problem for systems whose control strategies are based on the sky-hook concept is that the ‘sky’ does not actually exist. A solution to solve the sky-hook logic issue is using tuned rotatory inertia dampers and active rotatory inertia drivers which is addressed in this paper as well. Finally, it is concluded that these three solutions – employing a suspension/damper system in the bogie, an elastic connection for the train’s under-chassis-suspended equipment, and a ballastless railway – can practically mitigate vibration and noise in a train.

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Section: Train Design and Modal Identificationmentioning

confidence: 99%

A combined review of vibration control strategies for high-speed trains and railway infrastructures: Challenges and solutions

Zhang

Kordestani

Shadabfar

2022

Journal of Low Frequency Noise, Vibration and Active Control

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“…After differentiation of Equation (10) and its substitution into Equation (11), we obtain the following:…”

Section: Theoretical Aspects Of the "Field" Approachmentioning

confidence: 99%

“…The authors proposed two ways to reduce the reactive power which arises as a result of the formation of standing waves-either by the "suppression" (damping) of the already formed standing waves or by preventing the formation of reflected waves by the application of special thin film coatings (single or multi-layered) to the surface of these elements of the electric transport system. The last way is the most effective and state of the art method, which is developing in recent publications [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Electrodynamics of Power Losses in the Devices of Inter-Substation Zones of AC Electric Traction Systems

et al. 2022

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This article presents a new method for the estimation of active power losses based on a “field” approach, i.e., on the theory of the electromagnetic field and the theory of propagation of electromagnetic waves in a dielectric medium. Electromagnetic waves are assumed to transmit energy from the traction substation to electric rolling stock through the airspace of the inter-substation zone (i.e., not through the wires of the traction network) and meet electrically conductive surfaces on their way. The waves are partially reflected from the surfaces and partially penetrate them, thus creating thermal losses, the determination of which is the main task of this article. The analytical expressions for specific losses of active power are obtained by solving the system of Maxwell’s equations. Calculations of specific power losses in the catenary, rails, roofs, and bottoms of carriages and electric locomotives are performed. Power losses in carriages and electric locomotives are found to be at least 7%. A comparative assessment of the magnitude of total power losses of different types obtained by the “field” and “circuit” approaches is provided, which has established that “conditional” losses correspond to losses in rails, train carriages, and electric locomotives.

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“…The seat frame must meet various safety standards and also consider weight reduction to improve fuel economy [8][9][10]. Previous studies on the lightweight seat frame have reduced the weight of specific parts by applying high-strength and lightweight materials or by adjusting their geometry and thicknesses [11][12][13][14][15][16][17][18]. It is almost impossible, however, that high-strength lightweight materials, such as carbon fiber reinforced plastic (CFRP) and advanced high strength steel (AHSS), are applied to all the parts.…”

Section: Introduction (A Head)mentioning

confidence: 99%

Discrete Material and Thickness Optimization of Pop-Up Seat Frame in Static Condition

Moon

Shin

Jeon

et al. 2020

International Journal of Mechanical Engineering and Technology (Ijmet)

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With the increase in the number of lightweight, high-strength and highperformance automotive parts, studies are being conducted on the application of highstrength and lightweight materials and the optimization of the thickness values of these parts. From a practical perspective, however, the indiscriminate use of highstrength and lightweight materials leads to very low mass production. Suggesting optimum design values also requires the adoption of new processes that are not practical for application in manufacturing processes. In this study, discrete material and thickness optimization (DMTO) that considers materials and thickness values for commercialization was applied.A simple model of a retractable seat frame for recreational vehicles (RVs), whose thickness and material were not fixed, was investigated. Tests were conducted to secure accurate material properties for finite element analysis (FEA), and constraints were set based on the Federal Motor Vehicle Safety Standards (FMVSS) 207 and FMVSS 210 tests. The results of DMTO were compared with those of discrete thickness optimization (DTO) to verify the validity of the design parameters.

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Simulation Research on Electromagnetic Shielding Characteristics of Carbon Fiber Car Body for Railway Vehicles

Cited by 4 publications

References 5 publications

A combined review of vibration control strategies for high-speed trains and railway infrastructures: Challenges and solutions

A combined review of vibration control strategies for high-speed trains and railway infrastructures: Challenges and solutions

Electrodynamics of Power Losses in the Devices of Inter-Substation Zones of AC Electric Traction Systems

Discrete Material and Thickness Optimization of Pop-Up Seat Frame in Static Condition

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