Darwin Lagrangian: Difference between revisions

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In the study of [[mechanical network]]s in [[control theory]], an '''inerter''' is a two-terminal device in which the forces applied at the terminals are equal, opposite, and proportional to relative acceleration between the nodes. The generated strength satisfies the equation
: <math>F=b(\dot{v}_2-\dot{v}_1)</math>,
for a suitable constant ''b''.
 
[[Malcolm C. Smith]] first introduced inerters in a 2002 paper;<ref>{{cite doi|10.1109/TAC.2002.803532}}</ref> a similar device was demonstrated in 1998 by a Polish engineer Lucianus Lagiewka and used in automobile bumper application but the principle and design are the same: kinetic energy absorbing system that can be used as a bumper or as vibration absorber<ref>{{cite web|url=http://www.rexresearch.com/lagiewka/lagiewka.htm|title=Device for transforming kinetic energy}}</ref><ref>{{cite web|url=http://www.youtube.com/watch?feature=endscreen&NR=1&v=4_5oseSVUc4|title=Project EPAR}}</ref> - the device was a public knowledge since 1998. Smith is a [[control theory|control]] [[engineering]] professor at the [[University of Cambridge]]. He extended the analogy between [[electrical network|electrical]] and [[mechanical network]]s. He observed that the analogy was incomplete, since it was missing a mechanical device playing the same role as an electrical [[capacitor]]. It was found that it is possible to construct such a device using gears.
 
==Applications==
Shortly after its discovery, the inerter principle was used under the name of '''J-damper''' in the suspension systems of [[Formula 1]] [[racing car]]s. When tuned to the natural oscillation frequencies of the tires, the inerter reduced the mechanical load on the suspension. [[McLaren Mercedes]] began using a J-damper in early 2005, and [[Renault]] shortly thereafter.<ref>{{cite doi|10.1109/MCAS.2008.931738}}</ref>
 
J-dampers were at the center of a Formula 1 spying case arisen when Phil Mackereth left McLaren for Renault.
 
==Construction==
 
A linear inerter can be constructed by meshing a [[flywheel]] with a [[rack gear]].  The pivot of the flywheel forms one terminal of the device, and the rack gear forms the other.
 
A rotational inerter can be constructed by meshing a flywheel with the ring gear of a [[differential (mechanical device)|differential]].  The side gears of the differential form the two terminals.
 
==References==
{{Reflist}}
* [http://www-control.eng.cam.ac.uk/~mcs/lecture_j.pdf The Inerter Concept and Its Applications], lecture notes.
* [http://www.f1technical.net/features/10586 J-dampers in Formula 1]
 
[[Category:Control theory]]
 
{{automotive-tech-stub}}

Latest revision as of 21:25, 28 October 2013

In the study of mechanical networks in control theory, an inerter is a two-terminal device in which the forces applied at the terminals are equal, opposite, and proportional to relative acceleration between the nodes. The generated strength satisfies the equation

F=b(v˙2−v˙1),

for a suitable constant b.

Malcolm C. Smith first introduced inerters in a 2002 paper;[1] a similar device was demonstrated in 1998 by a Polish engineer Lucianus Lagiewka and used in automobile bumper application but the principle and design are the same: kinetic energy absorbing system that can be used as a bumper or as vibration absorber[2][3] - the device was a public knowledge since 1998. Smith is a control engineering professor at the University of Cambridge. He extended the analogy between electrical and mechanical networks. He observed that the analogy was incomplete, since it was missing a mechanical device playing the same role as an electrical capacitor. It was found that it is possible to construct such a device using gears.

Applications

Shortly after its discovery, the inerter principle was used under the name of J-damper in the suspension systems of Formula 1 racing cars. When tuned to the natural oscillation frequencies of the tires, the inerter reduced the mechanical load on the suspension. McLaren Mercedes began using a J-damper in early 2005, and Renault shortly thereafter.[4]

J-dampers were at the center of a Formula 1 spying case arisen when Phil Mackereth left McLaren for Renault.

Construction

A linear inerter can be constructed by meshing a flywheel with a rack gear. The pivot of the flywheel forms one terminal of the device, and the rack gear forms the other.

A rotational inerter can be constructed by meshing a flywheel with the ring gear of a differential. The side gears of the differential form the two terminals.

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

Template:Automotive-tech-stub

  1. ↑ Template:Cite doi
  2. ↑ Template:Cite web
  3. ↑ Template:Cite web
  4. ↑ Template:Cite doi
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