Rank: 190 based on 365 downloads (last 30 days) and 11 files submitted
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James Allison

E-mail
Company/University
University of Illinois at Urbana-Champaign
Lat/Long
40.111996, -88.225586

Personal Profile:

http://systemdesign.illinois.edu/

Professional Interests:
Engineering System Design, Design Optimization, Modeling and Simulation, Design of Dynamic Systems, Robotics, Sustainable Energy Systems

 

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Files Posted by James View all
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(last 30 days)
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25 Feb 2013 Screenshot Simultaneous Plant and Control Design of an Active Automotive Suspension Using Direct Transcription A toolbox for using Direct Transcription to perform combined plant and control design. Author: James Allison aerospace, automotive, control design, optimization, simulation, optimal control 38 0
24 Sep 2012 Screenshot Simulation and Limited Redesign of a Counterbalanced Two Link Robotic Manipulator Supplementary material for an ASME publication regarding limited redesign of mechatronic systems. Author: James Allison aerospace, automotive, control design, demo, optimization, simulation 19 0
16 Apr 2012 Screenshot Simulation and Limited Redesign of a Two Link Robotic Manipulator Supplementary material for an AIAA publication regarding limited redesign of mechatronic systems. Author: James Allison robotics, aerospace, control design, simulation, mathematics, demo 21 0
10 Apr 2012 Screenshot Simulation and Animation of a Linear and Nonlinear Pendulum Model Demonstrates how to use both movie2avi and VideoWriter to generate avi files from simulation data. Author: James Allison simulation, mathematics, image processing, education, dynamics 29 0
06 Apr 2012 Screenshot Trebuchet Range Simulation and Optimization Model of a simple trebuchet that predicts projectile range based on fulcrum position & launch angle. Author: James Allison simulation, optimization, mathematics, modeling, siege engines, medieval warfare 19 0
Comments and Ratings by James View all
Updated File Comments Rating
21 Mar 2013 Simulation and Animation of a Quarter-Car Automotive Suspension Model A standard linear quarter-car model is simulated and then animated. Author: James Allison

Alexandru: Perhaps there is another function 'ss' on your path that is superseding the built-in ss function:

http://www.mathworks.com/help/control/ref/ss.html

You can use the 'which' command to find out if this is the issue.

Another possibility is the ss is part of the control system toolbox. If you don't have that toolbox, then ss will not work.

27 Nov 2012 Simulation and Animation of a Quarter-Car Automotive Suspension Model A standard linear quarter-car model is simulated and then animated. Author: James Allison

umf is a multiplication factor that allows quick exploration of road profiles with different levels of roughness. It should be set to 1 for the output to correspond to the road profile in the .mat file.

Nice catch Louis. Yes, dt should be changed to dt2 on line 62.

06 Apr 2012 Analytical Target Cascading Example A simple optimization problem is used to illustrate Analytical Target Cascading. Author: James Allison

You can watch a video lecture that explains the basics of analytical target cascading by going to:

http://vimeo.com/21809054

06 Apr 2012 Analytical Target Cascading Example With Coupling Variables A simple optimization problem is used to illustrate ATC with coupling variables. Author: James Allison

You can watch a video lecture that explains the basics of analytical target cascading by going to:

http://vimeo.com/21809054

Comments and Ratings on James' Files View all
Updated File Comment by Comments Rating
21 Mar 2013 Simulation and Animation of a Quarter-Car Automotive Suspension Model A standard linear quarter-car model is simulated and then animated. Author: James Allison Allison, James

Alexandru: Perhaps there is another function 'ss' on your path that is superseding the built-in ss function:

http://www.mathworks.com/help/control/ref/ss.html

You can use the 'which' command to find out if this is the issue.

Another possibility is the ss is part of the control system toolbox. If you don't have that toolbox, then ss will not work.

21 Mar 2013 Simulation and Animation of a Quarter-Car Automotive Suspension Model A standard linear quarter-car model is simulated and then animated. Author: James Allison Alexandru

Hello,

I am interested in your app. But I have problems when running it. I get this error:
Undefined function 'ss' for input arguments of type 'double'.

Error in sim_qcar (line 48)
qcar = ss(Aqcar,Bqcar,Cqcar,Dqcar);

What am I missing?
Thank you!
Alex

24 Jan 2013 Simplified Gradient Descent Optimization Demonstration of the gradient descent optimization algorithm with a fixed step size. Author: James Allison JIao, Heng

27 Nov 2012 Simulation and Animation of a Quarter-Car Automotive Suspension Model A standard linear quarter-car model is simulated and then animated. Author: James Allison Allison, James

umf is a multiplication factor that allows quick exploration of road profiles with different levels of roughness. It should be set to 1 for the output to correspond to the road profile in the .mat file.

Nice catch Louis. Yes, dt should be changed to dt2 on line 62.

18 Oct 2012 Simulation and Animation of a Quarter-Car Automotive Suspension Model A standard linear quarter-car model is simulated and then animated. Author: James Allison Louis

Very helpful model, I have two comments though:
1. I think umf should be set to 1 (or removed)
2. on line 62 the division by dt should be changed to a division by dt2

These two details made the script output inaccurate results; the script otherwise gives consistent results.

Top Tags Applied by James
optimization, mathematics, design, simulation, aerospace
Files Tagged by James View all
Updated   File Tags Downloads
(last 30 days)
Comments Rating
25 Feb 2013 Screenshot Simultaneous Plant and Control Design of an Active Automotive Suspension Using Direct Transcription A toolbox for using Direct Transcription to perform combined plant and control design. Author: James Allison aerospace, automotive, control design, optimization, simulation, optimal control 38 0
24 Sep 2012 Screenshot Simulation and Limited Redesign of a Counterbalanced Two Link Robotic Manipulator Supplementary material for an ASME publication regarding limited redesign of mechatronic systems. Author: James Allison aerospace, automotive, control design, demo, optimization, simulation 19 0
16 Apr 2012 Screenshot Simulation and Limited Redesign of a Two Link Robotic Manipulator Supplementary material for an AIAA publication regarding limited redesign of mechatronic systems. Author: James Allison robotics, aerospace, control design, simulation, mathematics, demo 21 0
10 Apr 2012 Screenshot Simulation and Animation of a Linear and Nonlinear Pendulum Model Demonstrates how to use both movie2avi and VideoWriter to generate avi files from simulation data. Author: James Allison simulation, mathematics, image processing, education, dynamics 29 0
06 Apr 2012 Screenshot Trebuchet Range Simulation and Optimization Model of a simple trebuchet that predicts projectile range based on fulcrum position & launch angle. Author: James Allison simulation, optimization, mathematics, modeling, siege engines, medieval warfare 19 0

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