Linear controller design: limits of performance via convex optimization

Article Abstract:

The fundamental problem in the analysis and design of linear control systems, the determination of a control law that meets the design specifications for a particular system and control configuration, can be solved through the simultaneous consideration of all closed-loop transfer functions (transfer matrix H) necessary to evaluate a controller. A recent theoretical result for the parameterization of achievable closed-loop transfer matrices is combined with numerical convex optimization techniques to find solutions for the design specifications of a restricted set of linear and time-invariant (LTI) control systems. An important aspect of the design specification is that the closed-loop system should be stable. A nondifferentiable convex program offers a numerical solution when specifications are all closed-loop convex. Alternative LTI controller design approaches are presented for comparison.

Systems analysis, Numerical analysis, Product introduction, Control systems, System Design, Optimization, Controllers, New Technique, Closed-Loop Systems, Linearization, technical

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Simon Simple discovers a niche

Article Abstract:

A hypothetical situation is presented about running a startup engineering firm. An engineer named Simon Simple starts an engineering consulting and specialty technical report preparation firm called Simple Services Inc (SSI) with a $100,000 loan to be repaid with interest from a relative. He is able to win a contract from a manufacturer. However, Simon encounters difficulties with his cash flow. An analysis of his accounting methods will furnish a number of lessons on understanding the financial aspects of a start-up engineering consulting firm.

Case studies, Engineering services, Engineering firms, Financial analysis, Engineers, New business enterprises, Startups, Financial management, Cash management

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What's your favorite location?

Article Abstract:

Actors and film crew discuss their favourite film locations. Natascha McElhone highlights Menerbes, France, while Kirsten Dunst talks of filming in Prague, Czech Republic.

Analysis, Motion picture locations, Movie locations

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