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- W75148811 abstract "Process planning and tolerance allocation are the main sub domains for production planning. These factors can critically affect the total cost of manufacturing. In the field of manufacturing design specifications can be obtained by a number of feasible processes. For example a finished hole can be obtained by any one the these sequences viz drilling semi finish boring finish boring, drilling semi finish reaming finish reaming, drilling semi finish grinding finish grinding, etc. The cost of manufacturing depends on the type of process, the value of tolerances allocated to each process and the time required for machining (machine availability). Tighter tolerances for a process results in higher cost of manufacturing and vice versa. An optimization model has been previously proposed to generate the process plan with process and machine selection and optimal tolerance allocations for each process. The objective function of this optimization problem is to reduce the cost of manufacturing. This highly constrained optimization problem is a complex mixed integer nonlinear optimization problem. For a mixed integer nonlinear optimization problem the complexity of the problem increases as the number of process and machine increases. As the size of the optimization problem increase the search space and time required to solve the problem increases. Genetic algorithm simulated annealing and linear approximations have been proposed as methods for solving these problems. This thesis presents a sequential approximation method to solve this complex mixed integer nonlinear optimization problem by formulating and solving a series of IP problems by adding constraints at each iteration reducing the search space which leads to a solution approach that is faster than previous methods. This method uses point estimates of tolerance values obtained from previous iteration to update the cost parameters in the sequential iteration. The optimization problem is modeled in AMPL and solved using CPLEX. A custom C++ interface to AMPL is used to implement this method. Results from this method are compared to results from previous solution approaches. The proposed approximation method identifies similar cost of manufacturing solutions with different process plans in less time than other solving techniques." @default.
- W75148811 created "2016-06-24" @default.
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- W75148811 date "2003-01-01" @default.
- W75148811 modified "2023-09-27" @default.
- W75148811 title "AN EFFICIENT SEQUENTIAL INTEGER OPTIMIZATION TECHNIQUE FOR PROCESS PLANNING AND TOLERANCE ALLOCATION" @default.
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