A Dynamic System Model for Estimating Surface-Induced Frame Loads During Off-Road Cycling

Abstract

To facilitate the design analysis of off-road bicycle frames, this paper reports a dynamic model of the bicycle/rider system which estimates frame loads for bicycles traveling over rough surfaces. To develop this model, the frame loads at rider contact points were first measured experimentally as a rider coasted over a test track with randomly spaced surface irregularities in both seated and standing positions. Following this measurement, a dynamic system model was developed with the aid of the commercial software package, Dynamic Analysis and Design Software (DADS). The development process consisted of two stages. The first stage involved developing component models (e.g., seat) which could reproduce the essentials of the measured data. The second stage involved identification of parameter values for those parameters shown to most profoundly affect simulated load results. Following parameter identification, simulated loads were statistically tested and were not significantly different from experimental loads. Also, maximum magnitude dynamic loads were compared to corresponding static load magnitudes and were larger for eight of the ten load components measured. With the importance of dynamic loads demonstrated and the model verified, it can now be used advantageously to generate a loading database for design analysis purposes.

Quantification of Structural Loading During Off-Road Cycling

“…Subsequently, Wilczynski and reliability. To be reliable, the design of either a bicycle frame or Hull (1994) developed a dynamic system model for computing component must ensure adequate protection against failure under surface-induced loads during off-road cycling and made load meanormal service loading conditions. Failure can occur either catasurements to verify the model.…”

Conceptual Design of Shock Absorbing Bicycle Wheel

“…The experimental test rig should be created with dynamometer to measure the force acting on the front wheel and pedal [16]. Bow spoke should not deflect due to pedalling or small terrain, hence loading by applying time varying force excitations should be tested [17].…”

Measuring the Dynamic Structural Load of an Off-Road Bicycle Frame

“…The integration of all the required transducers and measuring systems on such a lightweight and compact structure presents a number of challenges [1][2][3][4][5][6][7] . At several points on the bike, force input is received from external sources.…”