The wind-induced vibration of the high-speed catenary and dynamic behaviour pantograph–catenary under stochastic wind field are firstly analysed. model is established based on nonlinear cable truss elements, which can fully describe nonlinearity each wire initial configuration. aerodynamic forces acting messenger/contact deduced by considering effect vertical horizontal fluctuating winds. winds simulated employing Davenport Panofsky spectrums, respectively. coefficients contact/messenger...

Due to the intrinsic nonlinear characteristics and complex structure of high-speed catenary system, a modelling method is proposed based on analytical expressions cable truss elements. The calculation procedure for solving initial equilibrium state Newton–Raphson iteration method. deformed configuration system as well length each wire can be calculated. Its accuracy validity computing are verified by comparison with separate model method, absolute nodal coordinate formulation other methods...

As for the rapid expansion of high-speed electrified railway industry, current collection quality electric locomotives becomes one crucial technical issues stable operation trains. The key measurement index that can characterize is contact force between catenary and pantograph on locomotive roof. One major factors affect wire irregularity, which appears to be very difficult measured or detected at present. In recent years, frequency-domain indicators pantograph-catenary (PCCF) have been...

As the speed of train increases, current collection quality (CCQ) faces more challenges. In this article, an adaptive catenary form-finding method is proposed based on variable-length nonlinear cable and truss elements. Through machine-learning training, optimal parameters six surrogate models are obtained. By comparing performance models, best model selected to replace physical model. With model, a multidisciplinary design with collaborative optimization presented optimize 400 km/h...

Galloping of an electrified railway overhead contact line (also known as catenary galloping) is a large-amplitude wind-induced vibration under extreme conditions that extremely detrimental to the infrastructure. This paper attempts conduct numerical simulation galloping and analyse its behaviour. Computational fluid dynamics utilized calculate aerodynamic coefficients wire with different classes wear. The mechanism revealed by Den Hartog theory. To describe non-linear behaviour galloping,...

In modern electrified railway industries, the transmission quality of electric power from supply to locomotive is determined by dynamic performance catenary-pantograph interaction. The mathematical modelling a high-performance tool study behaviour system. order improve calculation efficiency, moving mesh method implemented with nonlinear finite element model catenary. contact wire re-meshed according point between pantograph and catenary in each simulation time step. Addressing unbalanced...

The fluctuation in contact force between the pantograph and catenary severely affects current collection quality of electric multiple units high-speed railway. In particular, when double pantographs operate simultaneously, on trailing (TP) fluctuates violently due to passage leading (LP). To address this problem, a prior-information-based finite-frequency H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">∞</sub> controller, incorporating an...

This paper explores the use of pantograph-catenary contact force (PCCF) for monitoring current collection quality and detection anomalies in interaction between pantograph catenary. The concept catenary structure wavelength (CSW) is proposed as dominant component PCCF. It describes signal components caused by cyclical span interdropper distance. To obtain CSWs non-CSW residual PCCF, an automatic extraction approach based on ensemble empirical mode decomposition (EEMD) proposed. In approach,...

Identification of vulnerable lines in power systems has great meaning to predict cascading failures and prevent the blackouts. A novel approach identify based on weighted H-index is proposed. Firstly, remove Kirchhoff's law constraint system, a second-level correlation network constructed considering secondary failure. Then, relative node strength defined improve identification effectiveness. Secondly, proposed, aiming at disadvantages classic only suited for unweighted networks. The...

In high-speed railways, the quality of current collection train is directly determined by contact force between wire catenary and registration strip pantograph. order to ensure a stable force, this paper proposes control strategy for active pantographs minimizing acceleration pantograph collector. The model pantograph-catenary interaction established based on finite element approach multibody dynamics. A Kalman filter designed obtain states considering complex electromagnetic circumstances...

Active control of the pantograph is one promising measures for decreasing fluctuation in contact force between and catenary. In this paper, an estimator-based multiobjective robust strategy proposed active pantograph, which consists a state estimator H ∞ controller. The former serves as essential tool obtaining states considering randomly missing measurements, latter employed limitation collector uplift. Control performance evaluated by implementing with nonlinear pantograph–catenary system...

Temperature control system of aircraft cabin is a large time-constant, nonlinear and time-varying complex system, the accurate mathematical model controlled object hard to establish. So it difficult achieve satisfying effect by means traditional temperature method. According this situation, new approach proposed in paper. A fuzzy controller designed on basis original realize compensation control. Simulation results show that with has better dynamic-response characteristics, comparing using...

This paper is concerned with the nonsingular terminal sliding-mode (NTSM) tracking controller design approach for active suspension systems. The control objective of systems to provide superior ride comfort and stabilize attitude vehicle within suspension's travelling range. During process, a time-delay estimation (TDE) used in cancelling system nonlinearities, uncertainties, disturbances by intentionally using time-delayed information. Thus, proposed not only assures fast convergence due...

The aim of this study was to isolate lactic acid bacteria (LAB) from Sichuan pickle and assess their probiotic potential. Total 66 LAB were isolated 2 types based on morphological, physiological, biochemical, genotypic characteristics. Then, 6 strains (BH6, BH9, BH18, BH46, BH48, BH59) selected as candidates for further studies. in vitro experiment showed that the cholesterol degradation rate 4 BH6, BH59 exceeded 60%. And triglyceride 3 BH18 more than 17%. Out tested strains, most them...

Based on BP neural network to control the complex hydraulic gap (HGC) system and point out boundness of selection uncertainty for layers neurons randomness connection weights between layers. In this paper, an improved PID (PIDNN) is proposed make trapezoidal integral transform hidden neuron nodes incomplete differential transformation nodes. The output function each node hyperbolic tangent replace proportion threshold function. To by PIDNN, simulation results show that has better efficiency...

The optimization design of a robot was usually conducted by the sequential design, which, however, neglected interactive impacts different disciplines. To address this shortage, article presents multidisciplinary procedure for 2-degree-of-freedom robot. In proposed optimization, four disciplines are involved, which composed kinematics, dynamics, structure, and control. coupling relationship among is analyzed based on variable sensitivity analysis. A collaborative to obtain optimum values...