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General Chat (Vincent Related)
Greg Brillus Racer
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<blockquote data-quote="Flo" data-source="post: 101328" data-attributes="member: 3744"><p>The engineering 'sience' of the engine/vehicle dynamics is quite well understood nowadays. It is quite involved nevertheless. The excitation is due to the free forces and couples <strong><em>after balancing</em></strong>. The basics of balancing reciprocating slider-crank mechanisms based on assuming constant angular speed have been known since FW Lanchester's work. To analyse perceived vibration the transfer function (frequency and phase response) to handlebars, footrests and seat needs to be taken into account. Additionally the non uniformity of angular speed, which is strongly linked to engine revs, is nessing things up.</p><p></p><p>Hence either it is some experimental effort and a lot of work or the use of very sophisticated instrumentation and software. At the times when our motorcycles were made none of that was practically available - hence empirical methods ('seat of the pants' development work) and engineering flair were applied in the available helpings.</p><p></p><p>Personally I believe we have drawn quite a good lot.</p><p></p><p>PF</p></blockquote><p></p>
[QUOTE="Flo, post: 101328, member: 3744"] The engineering 'sience' of the engine/vehicle dynamics is quite well understood nowadays. It is quite involved nevertheless. The excitation is due to the free forces and couples [B][I]after balancing[/I][/B]. The basics of balancing reciprocating slider-crank mechanisms based on assuming constant angular speed have been known since FW Lanchester's work. To analyse perceived vibration the transfer function (frequency and phase response) to handlebars, footrests and seat needs to be taken into account. Additionally the non uniformity of angular speed, which is strongly linked to engine revs, is nessing things up. Hence either it is some experimental effort and a lot of work or the use of very sophisticated instrumentation and software. At the times when our motorcycles were made none of that was practically available - hence empirical methods ('seat of the pants' development work) and engineering flair were applied in the available helpings. Personally I believe we have drawn quite a good lot. PF [/QUOTE]
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Greg Brillus Racer
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