Design and Analysis

Design and Analysis are about finding unknowns and making predictions. These unknowns can be

1. Inputs

2. System (Mechanism) parameters

3. Outputs

• Analysis is about predicting required input to satisfy desired output given system parameters OR predicting output of a certain input given system parameters. It is like a function of system parameters and either required inputs or desired outputs

• Design is about identifying system parameters that satisfy desired outputs given allowable inputs

Examples:

1. Problem 1.9 in Sheet 1 requires the length of a link (system parameters) to achieve a desired Quick-return ratio (output), then it asks about the stroke length (output of system given that the input leads to extreme positions)

• Note: some special inputs (like those that lead to special outputs such as angular displacement of rocker) and outputs (like those that the system was designed to achieve such as stroke length or quick return ratio) can be considered among system parameters as well.

1. Problem 1.7 in Sheet 1 requires the angular displacements of the crank (input) that leads to the Extreme positions of the block (output)

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