Analysis of the Influence of Multi-Flexible Vehicle Coupling System on Dynamic Performance

2021 ◽  
Vol 10 (01) ◽  
pp. 1-10
Author(s):  
建安 敖
Keyword(s):  
Dynamic Performance ◽  
Coupling System

Modelling of Joint Interface of Turn-Milling Centre Based on Rigid-Flexible Coupling System

2011 ◽  
Vol 186 ◽  
pp. 412-417
Author(s):  
Li Da Zhu ◽  
Jian Qiu ◽  
Yue Hu Wang ◽  
Jiang Li ◽  
Wan Shan Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Models ◽  
Dynamic Performance ◽  
Joint Interface ◽  
Flexible Joints ◽  
Flexible Coupling ◽  
Plane Contact ◽  
Coupling System ◽  
Turn Milling

The mathematic models describing various joints of whole machine are founded to research dynamic performance of turn-milling center based on rigid-flexible coupling system. The various joint interfaces including the conical and cylinder contact, plane contact and fixed connection are regarded as flexible joints by using the spring and damping unit and the equivalent dynamic models of joint interfaces are built by finite element method based on different connection modes. Therefore, these mathematic models are used as references and foundations for research on dynamic performance of turn-milling center next stage.

Precise Position Adjustment of Automotive Electro-Hydraulic Coupling System with Parameter Perturbations

2022 ◽  
Author(s):  
Mingming Mei ◽  
Shuo Cheng ◽  
Liang Li ◽  
Bingjie Yan
Keyword(s):  
Dynamic Performance ◽  
Permanent Magnet Synchronous Motor ◽  
Low Frequency ◽  
Phase Lag ◽  
Precise Position ◽  
Coupling System ◽  
Guaranteed Cost ◽  
Hydraulic Coupling ◽  
Parameter Perturbations ◽  
Model Linearization

Abstract Based on the guaranteed cost theory, this paper proposes a robust controller for the automotive electro-hydraulic coupling system. However, parameter perturbation caused by the model linearization is a critical challenge for the nonlinear electro-hydraulic coupling system. Generally, the electrical brake booster system (E-Booster) can be separated into three parts, a permanent magnet synchronous motor (PMSM), a hydraulic model of the master cylinder, and the transmission mechanism. In this paper, the robust guaranteed cost controller (RGCC) could adjust accurately the pushrod position of the E-Booster and has strong robustness against internal uncertainties, and the linear extended state observer (LESO) was utilized to optimize E-Booster's dynamic performance. Thus, the tracking differentiator (TD) and LESO are used to improve the dynamic precision and reduce the hysteresis effect. The overshoot is suppressed by TD, and the disturbance caused by nonlinear uncertainty is restrained by LESO. Experiment results show that RGCC sacrifices 6% phase lag in the low-frequency domain for a 10% and 40% reduction in first and second-order respectively compared with the proportion integration differentiation (PID). Results demonstrate that RGCC has higher precision and stronger robustness in dynamic behaviour.

Dynamic Performance of Vehicle-Turnout-Bridge Coupling System in High-Speed Railway

2011 ◽  
Vol 50-51 ◽  
pp. 654-658
Author(s):  
Rong Chen ◽  
Wang Ping ◽  
Shun Xi Quan
Keyword(s):  
Relative Position ◽  
High Speed ◽  
Dynamic Performance ◽  
Dynamic Responses ◽  
Continuous Beam ◽  
Analysis Model ◽  
Wheel Load ◽  
System A ◽  
Coupling System ◽  
Contact Relation

In order to study dynamic behavior of vehicle-turnout-bridge coupling system, a vehicle-turnout-bridge dynamic analysis model is established by employing the dynamic finite element method (FEM). When No.18 crossover turnouts(with a speed of 350km/h) are laid symmetrically on the 6×32m continuous beam, influences of turnout/bridge relative position and wheel/rail contact relation in turnout zone on the system dynamic responses are analyzed. The result shows that: wheel/rail contact of turnout zone (especially the frog) has great effect on dynamic responses of turnout on bridge, thus the nose rail height of frog should be optimized to mitigate the wheel load transition and its longitudinal gradient. In terms of the 32m-span continuous beam, the best relative position is frog part of turnout arranged in the range of 1/8 and 1/4 of span.

Dynamic Assessment of Ballastless Track Stiffness and Settlement in High-Speed Railway

2010 ◽  
Author(s):  
P. Wang ◽  
R. Chen ◽  
X. P. Chen
Keyword(s):  
High Speed ◽  
High Stability ◽  
Dynamic Assessment ◽  
Dynamic Performance ◽  
Dynamic Interaction ◽  
High Speed Railway ◽  
Rigidity Results ◽  
Ballastless Track ◽  
Coupling System ◽  
Track Stiffness

Although ballastless track has such advantages as less maintenance and high stability, its big rigidity results in a strong wheel/rail dynamic interaction. In order to study a reasonable stiffness and uneven settlement limit for ballastless track and to optimize the dynamic performance of ballastless track under condition of high-speed running, vehicle together with ballastless track was viewed as an entire coupling system in this study. By adopting numerical simulation, we studied how the stiffness of foundation under rail and uneven settlement of subgrade influence the wheel/rail dynamic interaction. The results show that the reasonable stiffness of foundation under rail is within a range of 20∼30kN/mm, accordingly with a rail deformation within 1.3 ∼ 1.7mm. Through its dynamic analysis under different wavelengths and amplitudes, the uneven settlement of subgrade should be ≤L/1000.

Influencing Factors of Dynamic Performance of Jointless Turnout on Bridge in High-Speed Railway

2010 ◽  
Author(s):  
R. Chen ◽  
P. Wang ◽  
X. P. Chen
Keyword(s):  
High Speed ◽  
Dynamic Performance ◽  
Dynamic Responses ◽  
Wheel Load ◽  
Longitudinal Gradient ◽  
High Speed Railway ◽  
Coupling Vibration ◽  
Vertical Stiffness ◽  
Coupling System ◽  
Chinese Standard

Taking the case of 18# turnout (350km/h) laid on 6×32m continuous girder, a dynamic model for coupling system of vehicle and jointless turnout on bridge was established to analyze the factors that affected dynamic performance of jointless turnout on bridge, and several aspects were taken into consideration, i.e. train’s running quality, rail stress of turnout, vibration of turnout and bridge, and deformation, etc. It is shown that influenced by vibration and deformation of bridge, the train, turnout and bridge form a coupling vibration system, whose dynamic responses are stronger than those caused by train/turnout interaction on subgrade. Wheel/rail contact of turnout zone (especially the frog) has great effect on dynamic responses of jointless turnout on bridge, thus the nose rail height of frog should be optimized to mitigate the wheel load transition and its longitudinal gradient. When a train is passing a jointless turnout on bridge, a reasonable vertical stiffness for bridge is the key to keep its safety and comfort; as for the 32m continuous girder, the ratio of deflection to span should be ≤1/9000 under the ZK load (Chinese standard).

scholarly journals Study on the Influence of the Marshalling Position of Vehicles Without Braking Function on the Safety of Empty Freight Trains Under Braking Condition

2020 ◽  
Author(s):  
Yiping Jiang ◽  
Chunhui Yang ◽  
Shimin Luo
Keyword(s):  
System Dynamics ◽  
Dynamic Model ◽  
Dynamic Performance ◽  
Safety Performance ◽  
Front Part ◽  
Freight Train ◽  
Derailment Coefficient ◽  
Coupling System ◽  
Coupling Dynamics ◽  
Unloading Rate

In order to study the influence of the position of without braking function on the safety of empty freight trains, a dynamic model of the locomotive and vehicle-track coupling system was established based on the theory of vehicle system dynamics and the theory of train-track coupling dynamics. And the safety indicators of the empty freight train’s lateral wheelset force, derailment coefficient, and wheel unloading rate were analyzed and compared with the dynamic safety indicators of the empty freight trains with normal braking function, while the vehicles without braking function located in the front, middle and rear parts of the freight train. The results show that during the service brake conditions, whether there are vehicles without braking function or not, the safety performance of the empty freight train is not much different, and all meet the requirements of the GB5599-2019 standard, the safety performance of the vehicles without braking function is not significantly different from that of the normal vehicles, the lateral wheelset force and the derailment coefficient are slightly greater than those in other parts while the vehicles without braking function located at the front part of the train, and the dynamic performance is not much different when the vehicles without braking function located in the middle and rear of the train.

Application of Asymmetric Eigenvalue Method for Dynamic Analysis of Aqueducts

2012 ◽  
Vol 430-432 ◽  
pp. 799-802
Author(s):  
Yang Yang ◽  
Jian Min Ren ◽  
De Zhi Liu
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Properties ◽  
Dynamic Performance ◽  
Hydraulic Structures ◽  
Analysis Model ◽  
Irrigation Project ◽  
System A ◽  
Coupling System ◽  
Eigenvalue Method ◽  
Large Rectangle

Taking into consideration of the boundary conditions in fluid-solid interactions, the author built the FSI large rectangle aqueduct model of dynamic analysis according to the equation dynamic performance of the fluid-solid coupling system. Large aqueduct of the dynamic properties were analyzed with asymmetric eigenvalue method, dynamic properties rules were calculated by changing the depth of the water in the aqueduct. Aqueduct, also called elevated canal, is usually built over valley, lower land or river for conducting water from a distance or even for shipping.The aqueduct is one of the most important hydraulic structures in Yindaruqin Irrigation Project. After aqueduct is built, all kinds of reasons get its degree of safety descent so as to affect its ordinary running with the time going. Based on fluid-solid coupling system, a FSI analysis model of the aqueduct structure is established.

Ultrastructural Localization of Acid Mucosubstance in Skeletal Muscle

1967 ◽  
Vol 25 ◽  
pp. 52-53 ◽  
Author(s):  
William J. Dougherty ◽  
Samuel S. Spicer
Keyword(s):  
Striated Muscle ◽  
Divalent Cations ◽  
Ultrastructural Localization ◽  
Major Elements ◽  
Frozen Sections ◽  
Thorium Dioxide ◽  
Iron Solution ◽  
Coupling System ◽  
Psoas Muscles ◽  
Formalin Fixed

In recent years, considerable attention has focused on the morphological nature of the excitation-contraction coupling system of striated muscle. Since the study of Porter and Palade, it has become evident that the sarcoplastic reticulum (SR) and transverse tubules constitute the major elements of this system. The problem still exists, however, of determining the mechamisms by which the signal to interdigitate is presented to the thick and thin myofilaments. This problem appears to center on the movement of Ca++ions between myofilaments and SR. Recently, Philpott and Goldstein reported acid mucosubstance associated with the SR of fish branchial muscle using the colloidal thorium dioxide technique, and suggested that this material may serve to bind or release divalent cations such as Ca++. In the present study, Hale's iron solution adapted to electron microscopy was applied to formalin-fixed myofibrils isolated from glycerol-extracted rabbit psoas muscles and to frozen sections of formalin-fixed rat psoas muscles.

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