scholarly journals Dynamics and Control of a Free-Piston Diesel Engine

2003 ◽  
Vol 125 (3) ◽  
pp. 468-474 ◽  
Author(s):  
Tor A. Johansen ◽  
Olav Egeland ◽  
Erling Aa. Johannessen ◽  
Rolf Kvamsdal
Keyword(s):  
Diesel Engine ◽  
Control Structure ◽  
Piston Motion ◽  
Free Piston ◽  
Control Approach ◽  
Engine Design ◽  
Dynamics And Control ◽  
Scale Test ◽  
Freely Moving ◽  
And Control

Free-piston diesel engines are characterized by freely moving pistons without any crankshaft or camshaft connected to the pistons. This allows a compact and efficient engine design, but requires automatic control of the piston motion. This paper present a dynamic mathematical model of a free-piston diesel engine, and a control oriented dynamic analysis leading to a piston motion control structure. Experimental results using a full scale test cylinder are included and show feasibility of the suggested control approach.

Electrospinning Nanofibers: Measurements, Dynamics, and Control Strategy Development

2014 ◽  
Author(s):  
Yunshen Cai ◽  
Michael Gevelber
Keyword(s):  
Controller Design ◽  
Fiber Diameter ◽  
Operating Regime ◽  
Strategy Development ◽  
Process Conditions ◽  
Control Approach ◽  
Process Dynamics ◽  
Wide Range ◽  
Dynamics And Control ◽  
And Control

Electrospinning produces submicron fibers for a variety of applications using a wide range of polymers. Achieving the desired fiber diameter, maximizing productivity, and minimizing variation are important production objectives. This paper addresses several important areas needed to develop a general electrospinning control approach including: developing a correlation between measurements, process conditions, and the resulting fiber diameter, developing a method to determine an operating regime that meets manufacturing objectives, and identifying process dynamics for controller design.

Dynamics and Control of a Helicopter Carrying a Payload Using a Cable-Suspended Robot

2005 ◽  
Author(s):  
So-Ryeok Oh ◽  
Ji-Chul Ryu ◽  
Sunil K. Agrawal
Keyword(s):  
Control Method ◽  
Dual System ◽  
Robust Controller ◽  
Robot System ◽  
Control Approach ◽  
Cable Robot ◽  
Dynamics And Control ◽  
Position And Orientation ◽  
And Control ◽  
Scale Control

This paper presents a study of the dynamics and control of a helicopter carrying a payload through a cable-suspended robot. The helicopter can perform gross motion, while the cable suspended robot underneath the helicopter can modulate a platform in position and orientation. Due to the under-actuated nature of the helicopter, the operation of this dual system consisting of the helicopter and the cable robot is challenging. We propose here a two time scale control method, which makes it possible to control the helicopter and the cable robot independently. In addition, this method provides an effective estimation on the bound of the motion of the helicopter. Therefore, even in the case where the helicopter motion is unknown, the cable robot can be stabilized by implementing a robust controller. Simulation results of the dual system show that the proposed control approach is effective for such a helicopter-robot system.

scholarly journals DYNAMICS AND CONTROL OF DI AND HCCI COMBUSTION IN A MULTI-CYLINDER DIESEL ENGINE

2007 ◽  
Vol 40 (10) ◽  
pp. 463-470 ◽  
Author(s):  
M. Canova ◽  
F. Chiara ◽  
M. Flory ◽  
S. Midlam-Mohler ◽  
Y. Guezennec ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Hcci Combustion ◽  
Dynamics And Control ◽  
And Control

Free-piston diesel engine timing and control - toward electronic cam- and crankshaft

2002 ◽  
Vol 10 (2) ◽  
pp. 177-190 ◽  
Author(s):  
T.A. Johansen ◽  
O. Egeland ◽  
E. Aa Johannessen ◽  
R. Kvamsdal
Keyword(s):  
Diesel Engine ◽  
Free Piston ◽  
And Control

Dynamics and control of the Czochralski process II. Objectives and control structure design

1988 ◽  
Vol 91 (1-2) ◽  
pp. 199-217 ◽  
Author(s):  
Michael A. Gevelber ◽  
George Stephanopoulos ◽  
Michael J. Wargo
Keyword(s):  
Control Structure ◽  
Structure Design ◽  
Dynamics And Control ◽  
And Control ◽  
Czochralski Process

On Dynamics and Control of Multi-Link Flexible Manipulators

1995 ◽  
Vol 117 (2) ◽  
pp. 134-142 ◽  
Author(s):  
W. Gawronski ◽  
C.-H. C. Ih ◽  
S. J. Wang
Keyword(s):  
Rigid Body ◽  
Inverse Dynamics ◽  
Linear Time ◽  
Flexible Manipulator ◽  
Flexible Manipulators ◽  
Link Length ◽  
Joint Torques ◽  
Control Approach ◽  
Dynamics And Control ◽  
And Control

This paper presents solutions of dynamics, inverse dynamics, and control problems of multi-link flexible manipulators. In deriving the manipulator dynamics, flexible deformations are assumed to be small in relation to the link length, angular rates of the links are assumed to be much smaller than their fundamental frequencies, and nonlinear terms (centrifugal and Coriolis forces) in the flexible manipulator model are assumed to be the same as those in the rigid body model. Flexible displacements are measured with respect to the rigid body configuration, obtained from its rigid body inverse kinematics. As a result, a linear time-varying system is obtained. The inverse dynamics problem consists of determination of joint torques for a given tip trajectory such that joint angles in the flexible configuration are equal to the angles in the rigid body configuration. The manipulator control system consists of the feedforward compensation and feedback control loops. Simulation results of a two-link space crane with a large payload show that the performance of this linearized dynamics and control approach is accurate, and at the same time is robust when subjected to parameter variations during slew operations.

scholarly journals Unmanned cruciform winged glider dynamics and control

2018 ◽  
pp. 55-60
Author(s):  
M. A. Polishchuk ◽  
M. V. Polishchuk
Keyword(s):  
Control Structure ◽  
Longitudinal Axis ◽  
Operating Conditions ◽  
Flight Performance ◽  
Autonomous Flight ◽  
Flight Phase ◽  
Ratio Effect ◽  
Dynamics And Control ◽  
And Control ◽  
Wing Aspect Ratio

Tha paper focuses on the problems of unmanned cruciform winged glider dynamics and control in autonomous flight conditions, and studies the wing aspect ratio effect on its flight performance. The winged glider control structure in the longitudinal and lateral axes is proposed. We carried out a comparative analysis of the ballistic flight ranges of models of different configurations, as well as the flight ranges of models of different configurations in the operating conditions of the control system of the proposed structure. As a result, the structure of the unmanned winged glider targeting system is proposed. The targeting system in the longitudinal axis, unlike the samples used in currently operating models, consists of two subsystems responsible for the unmanned winged glider best range gliding at the first flight phase and the direct aimpoint guidance at the second, i.e. final, flight stage

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