scholarly journals Tracking Control for High-Performance Motion of a Hydraulic Infinite Linear Actuator

2018 ◽  
Vol 23 (6) ◽  
pp. 2782-2793
Author(s):  
Martin Hochwallner ◽  
Lie Pablo Grala Pinto ◽  
Petter Krus
Keyword(s):  
Tracking Control ◽  
High Performance ◽  
Linear Actuator ◽  
Infinite Linear

Motion Control Concepts for the Hydraulic Infinite Linear Actuator

2016 ◽  
Author(s):  
Martin Hochwallner ◽  
Petter Krus
Keyword(s):  
Motion Control ◽  
Digital Control ◽  
Hydraulic System ◽  
Degrees Of Freedom ◽  
The Other ◽  
Linear Actuator ◽  
The Novel ◽  
Smooth Motion ◽  
Three Degrees Of Freedom ◽  
Infinite Linear

This contribution presents the novel Hydraulic Infinite Linear Actuator (HILA). It focuses on the control of motion and is based on simulation and analysis. The novel actuator consists of two symmetric double acting cylinders with a common piston rod and hydraulically detachable pistons. Alternatingly one cylinder engages and drives the load while the other retracts, the HILA thus works in a kind of rope climbing motion. The purpose of this contribution is to study the motion control of the HILA and to mimic the behaviour of a conventional cylinder. The HILA has three degrees of freedom which are temporarily coupled compared with one in a conventional cylinder. Further, the HILA with the chosen hydraulic system has two continuous and two digital control inputs. The challenge to be tackled is to combine the short stroke back and forth motions of the cylinders into a continuous smooth motion ofthe whole actuator. Results from simulations and analyses show that the investigated concepts can keep the jerk within acceptable limits for many applications.

scholarly journals Numerical Evaluation of Structural Safety of Linear Actuator for Flap Control of Aircraft Based on Airworthiness Standard

Aerospace ◽  
2021 ◽  
Vol 8 (4) ◽  
pp. 104
Author(s):  
Dong-Hyeop Kim ◽  
Young-Cheol Kim ◽  
Sang-Woo Kim
Keyword(s):  
Numerical Analysis ◽  
Analytical Method ◽  
Safety Evaluation ◽  
Experimental Tests ◽  
Structural Safety ◽  
Linear Actuator ◽  
The Finite Element Method ◽  
Margin Of Safety ◽  
Verification Methodology ◽  
The Given

Airworthiness standards of Korea recommend verifying structural safety by experimental tests and analytical methods, owing to the development of analysis technology. In this study, we propose a methodology to verify the structural safety of aircraft components based on airworthiness requirements using an analytical method. The structural safety and fatigue integrity of a linear actuator for flap control of aircraft was evaluated through numerical analysis. The static and fatigue analyses for the given loads obtained from the multibody dynamics analysis were performed using the finite element method. Subsequently, the margin of safety and vulnerable area were acquired and the feasibility of the structural safety evaluation using the analytical method was confirmed. The proposed numerical analysis method in this study can be adopted as an analytical verification methodology for the airworthiness standards of civilian aircraft in Korea.

An Electrostatic Stepper Motor

1996 ◽  
Vol 10 (23n24) ◽  
pp. 2917-2923
Author(s):  
E.C. Partington ◽  
Edward Chun Kay Wong ◽  
W.A. Bullough
Keyword(s):  
Electrorheological Fluid ◽  
Stepper Motor ◽  
Linear Actuator ◽  
Step Width ◽  
Primary Motion

This paper describes a new concept in pulse controlled motor and precision linear actuator techniques. Piezo translators [PZT] employed to provide reciprocating primary motion are connected to a load via a controllable electrorheological fluid [ERF] clutch to form a programmable speed and step-width drive. Ideal considerations are used to quantify the limiting potential of the drive and details are given of its development and progress.

On the theory of infinite linear and quasilinear automata

Cybernetics ◽  
1974 ◽  
Vol 7 (4) ◽  
pp. 580-593
Author(s):  
V. P. Zarovnyi
Keyword(s):  
Infinite Linear
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