Read e-book online Computer-Aided Design, Engineering, and Manufacturing PDF

By CORNELIUS LEONDES

ISBN-10: 0849309956

ISBN-13: 9780849309953

V. 1. platforms strategies and computational tools -- v. 2. Computer-integrated production -- v. three. Operational tools in computing device aided layout -- v. four. Optimization tools for production -- v. five. The layout of producing platforms -- v. 6. production structures method -- v. 7. man made intelligence and robotics in production

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Extra resources for Computer-Aided Design, Engineering, and Manufacturing

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No deadlines are imposed on job completion. 9. Setup times are negligible and need not be modeled. In this chapter, most problems do incorporate setup times, so that Assumption 9 is very often replaced. Objective Functions Objective functions represent quantitative measures of schedule quality. In a scheduling problem, the value of the objective function is to be optimized (minimized or maximized, depending on the nature of the measure). An “ideal” objective function will be able to represent the true economy of a particular schedule, as assessed according to all quantifiable costs and benefits.

When scheduling with setup times, the formation of classes will typically represent the logical grouping of jobs according to similarities in the processing requirements of jobs. Hence, setup times can be reduced by scheduling jobs of the same class together. 2 Job Referencing Summary Problems without classes Problems with classes Multi-operation models jth job jth job of ith class kth operation of jth job aj ai[j] aj,k Associated with a job will be data ( job properties) relevant to the scheduling problem.

These resources can be “items” such as tools and machinery, as well as raw materials, energy, and labor. Some of these resources can be considered to be in limitless supply while others may be available in limited quantities and/or for limited periods. Additionally, a cost will be associated with the usage of each resource. Whereas some resource usage costs will either be able to be implied by (and optimized with) the schedule, or considered unimportant, others may have a considerable unit cost whose total value is dependent on the schedule followed.

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Computer-Aided Design, Engineering, and Manufacturing by CORNELIUS LEONDES


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