MACHINE DESIGN - An 3-2a-1PROBLEM 3-2a Statement: Draw free-body diagrams for the system of Problem 3-1a (bicycle frame).Assumptions:1.A two-dimensional model is adequate.2. The lower front-fork bearing at Ctakes all of the thrust load from the front forks.3. There are no significant forces on the handle bars.Solution: See Mathcad file P0302a.1. A typical bicycle frame is shown in Figure 3-2a. There are five points on the frame where external forces and moments are present. The rider's seat is mounted through a tube at A. This is a rigid connection, capable of transmitting two force components and a moment. The handle bars and front-wheel forks are supported by the frame through two bearings, located at Band C. These bearings are capable of transmitting radial and axial loads. The pedal-arm assembly is supported by bearings at D. These bearings are capable of transmitting radial loads. The rear wheel-sprocket assembly is supported by bearings mounted on an axle fixed to the frame at
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