scholarly journals A Study on the Method of Measuring the Contact Force between Pantograph and Contact Wire (1st Report, Extension of the Frequency Range for Contact Force Measurement by an Improved Method of Evaluating the Pantograph Inertia Force)

2004 ◽  
Vol 70 (694) ◽  
pp. 1636-1643 ◽  
Author(s):  
Mitsuru IKEDA
Keyword(s):  
Contact Force ◽  
Force Measurement ◽  
Inertia Force ◽  
Frequency Range ◽  
Improved Method ◽  
Contact Wire

scholarly journals Analysis of Contact Force Variation between Contact Wire and Pantograph Based on Multibody Dynamics

2010 ◽  
Vol 3 (3) ◽  
pp. 552-567 ◽  
Author(s):  
Mohd Azman ABDULLAH ◽  
Yohei MICHITSUJI ◽  
Masao NAGAI ◽  
Naoki MIYAJIMA
Keyword(s):  
Multibody Dynamics ◽  
Contact Force ◽  
Contact Wire ◽  
Force Variation

Adaptive Contact Force Control of a Flexible Beam Using Output Feedback

2000 ◽  
Author(s):  
Woosoon Yim
Keyword(s):  
Contact Force ◽  
Contact Surface ◽  
Force Control ◽  
Closed Loop ◽  
Force Measurement ◽  
Transient Behavior ◽  
Loop System ◽  
Flexible Beam ◽  
Reference Trajectory ◽  
Closed Loop System

Abstract This paper presents an adaptive force trajectory control of a flexible beam using a piezoceramic actuator. Based on the adaptive backstepping method, a force control system using only force measurement is designed. For the derivation of the control law, it is assumed that parameters of the beam and contact surface stiffness are unknown. It is shown that in the closed-loop system, the contact force tracks a given reference trajectory and the beam vibration is suppressed as well. Digital simulations results show that the closed-loop system has good transient behavior and robust performance in the presence of uncertainties in the parameters of the flexible beam and the contact surface.

Force Reduction by Motion Design in Spring-Loaded Cam Mechanisms

1984 ◽  
Vol 106 (3) ◽  
pp. 278-284 ◽  
Author(s):  
R. C. Johnson
Keyword(s):  
Contact Force ◽  
High Speed ◽  
Critical Force ◽  
Inertia Force ◽  
Motion Synthesis ◽  
Spring Force ◽  
Force Reduction ◽  
Motion Design

A strategy of motion synthesis is developed for reducing critical forces in relatively rigid high-speed spring-loaded cam mechanisms. A special motion is specifically presented to illustrate application of the developed strategy, for the dwell-rise-dwell displacement case. Critical force graphs are presented for a numerical industrial probelm in three examples, comparing the developed special motion with the commonly used cycloidal and modified trapezoidal motions. Maximum values of cam contact force, inertia force, and spring force are all appreciably reduced by the special motion.

The Behaviour of Railway Wheelsets and Track at High Frequencies of Excitation

1982 ◽  
Vol 24 (2) ◽  
pp. 103-111 ◽  
Author(s):  
S. L. Grassie ◽  
R. W. Gregory ◽  
K. L. Johnson
Keyword(s):  
Experimental Data ◽  
Mathematical Model ◽  
Contact Force ◽  
Analytical Methods ◽  
Dynamical Response ◽  
Frequency Range ◽  
High Frequencies ◽  
Good Agreement

The dynamical response in the frequency range 50–1500 Hz is investigated of a railway wheelset resting on the track and excited vertically, laterally and longitudinally at a point of contact. A mathematical model of a railway wheelset is developed which comprises a few simple components to which analytical methods can be applied. Good agreement is obtained between experimental data and calculations made using this model. For a given sinusoidal displacement imposed between wheel and rail, the contact force is in general greatest longitudinally and least laterally.

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