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Jack H.Dynamic system modeling and control.2004.pdf
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writing guide - 32.1

32. PROJECTS

32.1

The project is intended to emphasize proper project management and team skills to produce a complex engineering system from concept to completion.

32.2 OVERVIEW

Cranes are used to move large loads in industrial environments. To do this they normally lift a load and then move it to a new position. At the end of the motion the load is put down. If the load is swaying, the operator may have to pause before putting down the load. This delay is undesirable because it increases the total cycle time for the crane.

This design project will endeavor to build a proof-of-concept prototype for an antisway system for a gantry crane as shown in Figure 32.1. The crane will ride on a wooden beam constructed with 2x4 lumber (actually smaller). An electric

writing guide - 32.2

motor will drive the cart left or right. The mass will hang below the cart.

motor driven cart

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

pivot point

 

 

 

 

 

 

 

 

 

 

 

 

 

fixed rail (wood 2x4)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1Kg mass

Figure 32.1 The equipment

The system will use active compensation to move the cart between positions, and to move the cart to compensate for swaying of the suspended mass. The overall system performance will be evaluated on how quickly the crane can move the load, and then eliminate sway. Additional factors used in assessment of performance will be the mass, cost and overall design quality.

32.2.1 The Objectives and Constraints

The design will be mounted on 2x4 lumber and controlled through a wire harness to external electronics and power supplies. The apparatus must be easily mounted and removed without damaging the experimental setup. It will be expected to carry a 1Kg mass, suspended 40cm below the top of the 2x4. The 2x4 will be oriented so that the longer dimension is vertical. The mass will be mounted with a carriage bolt that is at least 3 inches long, with a 1/4" diameter. The arm must be able to swing freely, as it is meant to be equivalent to a cable suspending the mass. The mass will be provided with a rod that will be between 1/4" and 1/2". The mass will be a cylinder that is free to rotate to reduce dynamic effects rotation. The width of the mass will be less than or equal to the