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hw1soln

hw1soln - ME 375 Homework 1 Solution Problem 1 For each of...

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ME 375 Homework 1 : Solution August 31, 2009 Problem 1 For each of the following systems, draw a schematic model representation us- ing lumped mass, spring, and damping elements. Label each of the elements in your model. State any assumptions that you make. Make sure you include any pertinent inputs. Part A A single pressed key on a computer keyboard; you’re interested in how many keypresses can be made in succession. Figure 1: Prob 1-A Assumptions: The keyboard is not moving horizontal or vertical. When pressing the key, we only have a pure force F. 1

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We assume that only the keycap has a mass and not the switch. the mechanical switch is represented by a spring and a damper. Schematic: A parameter model schematic for the key on a computer key- board is shown in Figure-1. The parameters in the model include the follow- ing: F : the force used for pressing the keycap. m key : the mass of the keycap.
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