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These larger-scale project statements deliberately lack detail and structure and are loosely defined. Thus, they are similar to the kind of identification of need or problem statement commonly,Matlab, or TKSolver will be useful here.

((P111)) The tennis coach needs a better tennis ball server for practice. This device must fire a sequence of standard tennis balls from one side of a standard tennis court over the net such that they land and bounce within each of the three court areas defined by the courts white lines. The order and frequency of a balls landing in any one of the three court areas must be random. The device should operate automatically and unattended except for the refill of balls. It should be capable of firing 50 balls between reloads. The timing of ball releases should vary. For simplicity, a motor-driven pin-jointed linkage design is preferred. This project asks you to design such a device to be mounted upon a tripod stand of 5foot height. Design it, and the stand, for stability against tipover due to the shaking forces and shaking torques which should also be minimized in the design of your linkage. Minimize the input torque.

THE QESTIONS WAS TAKEN FROM

((DESIGN OF MACHINERY))

An IntroductIon to the SyntheSIS And AnAlySIS of MechAnISMS And MAchIneS Sixth Edition WHERE THE INTRODUCTON OF THE QESTIONS WAS The following problem statement applies to all the projects listed. These larger-scale project statements deliberately lack detail and structure and are loosely defined. Thus, they are similar to the kind of identification of need or problem statement commonly encountered in engineering practice. It is left to the student to structure the problem through background research and to create a clear goal statement and set of performance specifications before attempting to design a solution. This design process is spelled out in Chapter 1 and should be followed in all of these examples. All results should be documented in a professional engineering report. See the Bibliography in Chapter 1 for references on report writing. Some of these project problems are based on the kinematic design projects in Chapter 3. Those kinematic devices can now be designed more realistically with consideration of the dynamic forces that they generate. The strategy in most of the following project problems is to keep the dynamic pin forces and thus the shaking forces to a minimum and also keep the input torque-time curve as smooth as possible to minimize power requirements. All these problems can be solved with a pin- jointed fourbar linkage. This fact will allow you to use program LinkAges to do the kinematic and dynamic computations on a large number and variety of designs in a short time. There are infinities of viable solutions to these problems. Iterate to find the best one! All links must be designed in detail as to their geometry (mass, moment of inertia, etc.). An equation solver such as Mathcad, Matlab, or TKSolver will be useful here. Determine all pin forces, shaking force, shaking torque, and input horsepower required for your designs.

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