A spatial coupling model to study dynamic performance of pantograph-catenary with vehicle-track excitation

Song, Ye‐Qiong; Wang, Zhiwei; Liu, Zhigang; Wang, Ruichen

doi:10.1016/j.ymssp.2020.107336

Cited by 179 publications

(98 citation statements)

References 66 publications

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“…e presence of both quadratic and cubic nonlinear terms in equation (8) gives rise to a rich and complex set of responses. A variety of phenomena are associated with the occurrence of the resonance conditions for the system, namely, the primary one, and the order one-half/one-third subharmonic resonances, and the two-order/three-order superharmonic resonances.…”

Section: Perturbation Analysismentioning

confidence: 99%

“…In the past few years, structures with flexible cables have attracted significant attention. e potential application of the fundamental research in practical industries is exhibited, especially the shape-finding [7] and dynamic analysis [8] as well as sliding mode control [9] of pantograph-catenary in high-speed railway engineering. ese flexible systems especially possess low structural damping and small stiffness, and thus any disturbances may cause large-amplitude vibrations [10].…”

Section: Introductionmentioning

confidence: 99%

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Temperature Effects on Dynamic Properties of Suspended Cables Subjected to Dual Harmonic Excitations

Zhao

Zheng

Lin

et al. 2021

Shock and Vibration

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The paper aims at studying the influences of temperature on the suspended cables’ dynamical behaviors subjected to dual harmonic excitations in thermal environments. Significantly, the quadratic nonlinearity and the corresponding secondary resonances are considered. By introducing a tension variation factor, the nonlinear vibration equations of motion could be obtained based on the condensation model. By using Galerkin’s procedure, the continuous model of the nonlinear system is reduced to a set of infinite models with quadratic and cubic nonlinearities. By using the multiple scales method, the resultant reduced model is solved and the stability analysis is also presented in two simultaneous resonance cases. Nonlinear dynamical behaviors with thermal effects are presented using bifurcation diagrams, time-history curves, phase portraits, frequency spectrums, and Poincaré sections. The numerical results show that thermal effects induce different scenarios. The sensitivities of linear (natural frequency) and nonlinear (quadratic and cubic) coefficients to temperature variations are different. The temperature may increase or decrease the response amplitudes depending on the excitation amplitude and the sag-to-span ratio. The inflection point is shifted and exhibited at a smaller or larger excitation amplitude in thermal environments. The resonant range between two Pitchfork bifurcations seems to be reduced when the temperature is decreasing. The response amplitude is very sensitive to temperature, and even an opposite spring behavior may be exhibited due to warming/cooling conditions. However, the periodic motions seem independent of temperature variations.

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Section: Perturbation Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Temperature Effects on Dynamic Properties of Suspended Cables Subjected to Dual Harmonic Excitations

Zhao

Zheng

Lin

et al. 2021

Shock and Vibration

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“…Therefore, after a period of proposing new algorithms, some of them began to be applied and fitted to specific engineering problems. The optimum design of concrete structures, which has been widely used in building [8], road [9], rail [10], and marine [11] engineering, is one of these specific problems.…”

Section: Introductionmentioning

confidence: 99%

“…The length of form is b + 2h. The optimization variable ξ is constrained in the interval [-0.7, 0.7]; the angle of the neutral fiber θ in [0, π/2] rad; the width of the cross-section b in [0.30, 0.50] m; the height h in [0.30, 0.90] m; the reinforcement bar diameters φ'x, φx in[10,32] mm; the number of reinforcement bars n'y, ny in [0, 0] and n'x, nx in[2,10]. The constraints (8) to (10),(11),(12) to(15) and(16) are considered in this example.…”

mentioning

confidence: 99%

Optimization of Reinforced Concrete Sections under Compression and Biaxial Bending by Using a Parallel Firefly Algorithm

Sánchez-Olivares

Espín

2021

Applied Sciences

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A simple formulation for the optimal design of reinforced concrete sections under compression and biaxial bending was established in a previous work by the authors. In that work, it was found that the formulation produced satisfactory results when used together with three algorithms that belong to the nature-inspired meta-heuristic algorithm group. However, despite the favorable results obtained, the necessary calculation times were extensive in all the cases. In order to solve this problem, the authors implemented a parallel calculation strategy in the algorithm that gave better results in the previous work. It was possible to verify, through two examples, that this strategy reduces calculation times as more processes are used in parallel, and that the adjustments made in the algorithm favor reaching designs close to the global optimum independently of the number of parallel processes adopted.

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“…On the other hand, about 44% of the railway networks are supplied in DC [5], where the braking energy can be reused only by other trains within the same network that need energy at the same time, since the traditional supply substations are unidirectional. In fact, they are equipped with diode rectifiers to transfer the power from the main AC grid to the overhead contact line [6], which carries the power to the trains through the pantograph [7]. In this condition, it is evident that this possibility of recovery is strongly influenced by the dynamic conditions of the line.…”

Section: Introductionmentioning

confidence: 99%

Design of a Stationary Energy Recovery System in Rail Transport

et al. 2021

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Although rail is one of the most sustainable transport systems, there is still room to reduce its energy demand. In particular, during the braking of DC powered trains, a significant amount of energy is wasted. The recent developments in energy storage system technologies, combined with the widely used technique of regenerative braking, can considerably increase energy saving. This paper explores this theme, quantifying the amount of braking energy that can be potentially recovered in a real case study, starting from the experimental data measured on-board train. A simplified numerical model of the recovery process has been implemented. Adopting it, the energy that can be saved, with one or two energy storage systems, has been quantified for each possible position along the track. The procedure allows to determine the optimal position. Further findings about the impact of voltage level on the efficiency of the recovery process have been reported. The optimal level of voltage has been determined, also considering the additional losses in the catenary, both during the traction and braking phase of the train. Moreover, it allows dimensioning of stationary storage systems considering two different energy management strategies and their impact on the peak of stored energy. The proposed approach will be presented with reference to the concrete case of a specific route on the Italian rail network, analyzing a train in normal commuter service and the obtained results will be discussed. In the best situation, about the 73% of the braking energy can be recovered.

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A spatial coupling model to study dynamic performance of pantograph-catenary with vehicle-track excitation

Cited by 179 publications

References 66 publications

Temperature Effects on Dynamic Properties of Suspended Cables Subjected to Dual Harmonic Excitations

Temperature Effects on Dynamic Properties of Suspended Cables Subjected to Dual Harmonic Excitations

Optimization of Reinforced Concrete Sections under Compression and Biaxial Bending by Using a Parallel Firefly Algorithm

Design of a Stationary Energy Recovery System in Rail Transport

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