A Hinfinity-based control design methodology dedicated to active control of vehicle longitudinal oscillations

2003 ◽  
Author(s):  
D. Lefebvre ◽  
P. Chevrel ◽  
S. Richard
Keyword(s):  
Active Control ◽  
Design Methodology ◽  
Control Design

scholarly journals A multi-channel $$\varvec{H}_\infty $$ preview control approach to load alleviation design for flexible aircraft

2021 ◽  
Author(s):  
Ahmed Khalil ◽  
Nicolas Fezans
Keyword(s):  
Design Methodology ◽  
Control Design ◽  
Doppler Lidar ◽  
Preview Control ◽  
Reduced Order ◽  
Control Approach ◽  
Structural Fatigue ◽  
Trade Offs ◽  
Gust Load Alleviation ◽  
Near Future

AbstractGust load alleviation functions are mainly designed for two objectives: first, alleviating the structural loads resulting from turbulence or gust encounter, and hence reducing the structural fatigue and/or weight; and second, enhancing the ride qualities, and hence the passengers’ comfort. Whilst load alleviation functions can improve both aspects, the designer will still need to make design trade-offs between these two objectives and also between various types and locations of the structural loads. The possible emergence of affordable and reliable remote wind sensor techniques (e.g., Doppler LIDAR) in the future leads to considering new types of load alleviation functions as these sensors would permit anticipating the near future gusts and other types of turbulence. In this paper, we propose a preview control design methodology for the design of a load alleviation function with such anticipation capabilities, based on recent advancements on discrete-time reduced-order multi-channel $$H_\infty $$ H ∞ techniques. The methodology is illustrated on the DLR Discus-2c flexible sailplane model.

Control-design methodology for drinking-water treatment processes

2010 ◽  
Vol 10 (2) ◽  
pp. 121-127 ◽  
Author(s):  
Kim van Schagen ◽  
Luuk Rietveld ◽  
Alex Veersma ◽  
Robert Babuška
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Design Methodology ◽  
Treatment Plant ◽  
Control Design ◽  
Drinking Water Treatment ◽  
Water Treatment Plant ◽  
Process Characteristics ◽  
Chemical Usage ◽  
Treatment Step

The performance of a drinking-water treatment plant is determined by the control of the plant. To design the appropriate control system, a control-design methodology of five design steps is proposed, which takes the treatment process characteristics into account. For each design step, the necessary actions are defined. Using the methodology for the pellet-softening treatment step, a new control scheme for the pellet-softening treatment step has been designed and implemented in the full-scale plant. The implementation resulted in a chemical usage reduction of 15% and reduction in the maintenance effort for this treatment step. Corrective actions of operators are no longer necessary.

The CRONE Suspension: Modelling and Stability Analysis

2003 ◽  
Author(s):  
Xavier Moreau ◽  
Olivier Altet ◽  
Alain Oustaloup
Keyword(s):  
Stability Analysis ◽  
Transfer Function ◽  
Design Methodology ◽  
Control Design ◽  
Internal Stability ◽  
Function Modelling ◽  
Robust Control Design ◽  
Force Displacement ◽  
Crone Suspension ◽  
Transfer Function Modelling

The CRONE suspension, French acronym of “suspension a` Comportement Robuste d’Ordre Non Entier”, results from a traditional suspension system whose spring and damper are replaced by a mechanical and hydropneumatic system defined by a fractional (so-called non-integer) order force-displacement transfer function. Modelling, frequency-domain robust control design methodology and internal stability analysis are presented in this paper.

When, for whom and why expanding single-option offerings creates value: locomotion fit from choice between options

2021 ◽  
Vol 56 (1) ◽  
pp. 92-112
Author(s):  
Frank Mathmann ◽  
Mathew Chylinski
Keyword(s):  
Willingness To Pay ◽  
Active Control ◽  
Design Methodology ◽  
Content Type ◽  
Direct To Consumer ◽  
Expert Selection ◽  
Product Value ◽  
Practical Implications

Purpose Emerging direct-to-consumer brands offer a single option to consumers before expanding their assortment as the business grows. This provides a counterexample to commonly held beliefs concerning consumers’ aversion to single options. The purpose of this paper is to study when, for whom and why offering two product options (vs a single option) is valued by consumers. Design/methodology/approach Across six experiments, this research investigates consumers’ locomotion orientation (a motivation for controlling progress), which affects the valuation of choice (vs single options). Findings Consumers’ locomotion orientation determines perceived product value for products chosen from a two-option set (vs when considering a single option) because choice offers active control, which is engaging for high-locomotion consumers. Expanding the set to six options has no such effect. Research limitations/implications Studies 1, 4a and 4b are set in the context of expert-selected single options, while Studies 2, 3 and 5 do not involve expert selection. However, the authors does not contrast expert vs non-expert conditions directly. Practical implications Managers can increase consumers’ willingness to pay by using advertisements to induce locomotion or segmenting consumers based on locomotion orientations. Originality/value Research suggests that consumers value choice between options, yet many emerging brands succeed with a single option. The authors reconcile this by providing insights into motivations that determine when, for whom and why choice (vs a single option) is valued.

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