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On Dynamic Modelling of Compressed Air Engine With Connecting-Rod-Crank to Control Angular Position of Oscillating Rotation

[+] Author Affiliations
Alexandre C. Alves, Rodrigo T. Rocha

São Paulo State University, Bauru, Brazil

Jose M. Balthazar

ITA - Aeronautics Technological Institute, Bauru, Brazil

Angelo M. Tusset

Federal Technological University of Parana, Ponta Grossa, Brazil

Atila M. Bueno

São Paulo State University, Sorocaba, Brazil

Paper No. IMECE2016-66192, pp. V04BT05A019; 10 pages
doi:10.1115/IMECE2016-66192
From:
  • ASME 2016 International Mechanical Engineering Congress and Exposition
  • Volume 4B: Dynamics, Vibration, and Control
  • Phoenix, Arizona, USA, November 11–17, 2016
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5055-8
  • Copyright © 2016 by ASME

abstract

In this work is examined the dynamic behavior and the controllability of a compressed air engine with a connecting-rod-crank. The pneumatic motor is composed by a monocylinder, a connecting-rod and a control crank to the oscillating rotation. For the obtainment the nonlinear mathematical model was considered the Lagrange’s method and the components of the physical system in the model are considered as rigid bodies with unilateral restriction. Numerical analysis of the application of the passive control position by a nonconservative pneumatic force with pilot valves in the cylinder showed that it was not possible an exact control to the angular position desired for the output crank. To solve this problem, it is proposed an active control by the Linear Quadratic Regulator method (LQR), to the control of the connecting-rod-crank mechanism. In addition, the robustness of the proposed control technique is tested considering noise measurement in pneumatic external excitation. The numerical simulation results showed the efficiency of the proposed control to the nonlinear dynamic model of the connecting-rod-crank and the sensibility analysis for parametric errors to the control of the oscillating angular positions, demonstrating so that the proposed active control is adequate for this system.

Copyright © 2016 by ASME

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