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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet suspension
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<blockquote data-quote="hadronuk" data-source="post: 38473" data-attributes="member: 1866"><p>Has everyone seen this TT accident? </p><p></p><p><a href="http://www.youtube.com/watch?v=LZ1srcQMa_0" target="_blank">http://www.youtube.com/watch?v=LZ1srcQMa_0</a></p><p></p><p>This is one of the incidents that was analysed in the Cranfield and Imperial study.</p><p></p><p>It looks to me as if at one point he nearly regains control? It certainly looks as if fighting the bars may be making it worse.</p><p></p><p>The slowish incident I once had on an old (and well worn) Triumph T100 was over before I could react at all, which perhaps is why the bike recovered on its own?</p><p></p><p>Although the low speed is probably what saved me:-</p><p></p><p><a href="http://libra.msra.cn/Publication/6239374/on-steering-wobble-oscillations-of-motorcycles" target="_blank">http://libra.msra.cn/Publication/6239374/on-steering-wobble-oscillations-of-motorcycles</a></p><p></p><p>"Results show that steering wobble oscillations grow more vigorously as their amplitude increases beyond a few degrees of steering and that the stabilizing influence of the rider's tensing his/her muscles in response to a growing wobble problem is small. The work supports the idea that any machine which has a very lightly damped wobble mode at some operating condition may be made unstable by an unusual set of initial conditions and that the natural response of the rider to the problem will be largely ineffective. This idea is closely aligned with anecdotal accounts from general motorcycle usage."</p><p></p><p></p><p>Another study:</p><p></p><p><a href="http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5717690&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D5717690" target="_blank">http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5717690&url=http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5717690</a></p><p></p><p>"Burst oscillations occurring at high speed and under firm acceleration are suppressed with a mechanical steering compensator. Burst instabilities in the subject racing motorcycle are the result of interactions between the wobble and weave modes under high-speed cornering and firm-acceleration conditions. Under accelerating conditions the wobble-mode frequency decreases, while the weave mode frequency increases so that destabilizing interactions occur. The design analysis is based on a time-separation principle, which assumes that bursting occurs on time scales over which speed variations can be neglected. Therefore, under braking and acceleration conditions linear time-invariant models corresponding to constant-speed operation can be utilized in the design process. The inertial influences of braking and acceleration are modelled using d'Alembert-type forces that are applied at the mass centres of each of the model's constituent bodies. The resulting steering compensator is a simple mechanical network that comprises a conventional steering damper in series with a linear spring. This network is a mechanical lag compensator."</p><p></p><p>Wonder what it means in english?</p><p>And where can I buy a mechanical lag compensator?</p></blockquote><p></p>
[QUOTE="hadronuk, post: 38473, member: 1866"] Has everyone seen this TT accident? [URL]http://www.youtube.com/watch?v=LZ1srcQMa_0[/URL] This is one of the incidents that was analysed in the Cranfield and Imperial study. It looks to me as if at one point he nearly regains control? It certainly looks as if fighting the bars may be making it worse. The slowish incident I once had on an old (and well worn) Triumph T100 was over before I could react at all, which perhaps is why the bike recovered on its own? Although the low speed is probably what saved me:- [URL]http://libra.msra.cn/Publication/6239374/on-steering-wobble-oscillations-of-motorcycles[/URL] "Results show that steering wobble oscillations grow more vigorously as their amplitude increases beyond a few degrees of steering and that the stabilizing influence of the rider's tensing his/her muscles in response to a growing wobble problem is small. The work supports the idea that any machine which has a very lightly damped wobble mode at some operating condition may be made unstable by an unusual set of initial conditions and that the natural response of the rider to the problem will be largely ineffective. This idea is closely aligned with anecdotal accounts from general motorcycle usage." Another study: [URL]http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5717690&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D5717690[/URL] "Burst oscillations occurring at high speed and under firm acceleration are suppressed with a mechanical steering compensator. Burst instabilities in the subject racing motorcycle are the result of interactions between the wobble and weave modes under high-speed cornering and firm-acceleration conditions. Under accelerating conditions the wobble-mode frequency decreases, while the weave mode frequency increases so that destabilizing interactions occur. The design analysis is based on a time-separation principle, which assumes that bursting occurs on time scales over which speed variations can be neglected. Therefore, under braking and acceleration conditions linear time-invariant models corresponding to constant-speed operation can be utilized in the design process. The inertial influences of braking and acceleration are modelled using d'Alembert-type forces that are applied at the mass centres of each of the model's constituent bodies. The resulting steering compensator is a simple mechanical network that comprises a conventional steering damper in series with a linear spring. This network is a mechanical lag compensator." Wonder what it means in english? And where can I buy a mechanical lag compensator? [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet suspension
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