TABLE 8: Response table for means for throughput Level I II III IV 1 0.08681 0.10573 0.08675 0.08697 2 0.08628 0.08086 0.08659 0.08659 3 0.08684 0.06334 0.0676 0.08638 Delta 0.00065 0.06239 0.00018 0.00071 Rank 3 1 4 2 As shown in response table gives that demand time is more influencing factor than other factors. Than velocity of AGVs affects the system utilization and distance preference is very less influencing factor for system utilization. TABLE 9: Response table for system utilization Level I II III IV 1 21378 30457 22194 21319 2 21236 18732 23118 21318 3 21340 15761 22633 21315 Delta 20895 15670 38956 20233 Rank 2 1 3 4 4.3. Optimization In this thesis, system throughput of system and system utilization both are optimized by genetic …show more content…
of AGVs Level 3 4 Velocity of AGVs - 61.396 System utilization obtained by value of above factor in simulation is 0.2081%. Apart from the single objective functions considered for this problem, a combined function is also used to perform the multi-objective optimization for the FMS parameters. The function and the variable limits are given using following function. Equal weights are considered for all the responses in this multi-objective optimization problem. Hence W1 and W2 are equal to 0.5. Using an above following combined function attained which is optimized by using genetic algorithm – Z multi = 0.5 × [1.49155 – 0.0000938× X(1) distance preferences – 0.049155 × X(2) arrival demand time + 0.0006566 × X(3) no. of carts + 0.0005628 × X(4) velocity of carts] – 0.5 × [1.4642 – 0.0005717×X(1) distance preferences – 0.049406 × X(2) arrival demand time + 19 × X(3) no. of carts + 0.0006390 × X(4) velocity of carts] Table 12: Factor and their level for maximizing throughput and system utilization through genetic algorithm Factors Level Value Distance presence Level 1 Smallest …show more content…
5.2 Conclusion In this thesis, a simulation modeling and optimization of FMS objectives for evaluating the effect of factors such as demand arrival time, no. of AGVs, velocity of AGVs, and distance preference between two work stations used in system. System utilization and throughput both are affected by these factors. It is observed that from comparing the result maximum percentage of utilization is 10% against of throughput parameters. System utilization and throughput is more affected by demand arrival time comparatively other three factors. Distance preference also affects throughput and system utilization. For both system utilization and throughput distance preference should be smallest and as the demand arrival time increases both system utilization and throughput of system decreases. Number of AGVs and velocity of AGVs are less
Xij allow all auctions that ended in the last hour at a time when the auction began. Per auction component I, X Xij group consisting of groups to have the values of the (1 /3,1 /2, 1 ,2 ,4 ,6 ,12 ,24, with units of hours) was built. Each group in X, we have created new jobs consist of mean and standard deviation, minimum, maximum values of the initial offer, the shipping price and the final price. As we calculate | Xij |, and a number of similar listed for auction items in the hours before the start of the auction and the number of auctions where the item does not sell. More formally, each auction in our data set, the product tankers A x B x C which is calculated: where
Where, m ̅_(H,i) is the remaining probability mass that is not yet assigned to individual grades caused by the relative importance of the attribute i (denoted by e_i). It will be one if the weight of e_i is zero or ω_i=0 ; and will be zero if e_i dominates the assessment or ω_i=1. m ̃_(H,i) is the remaining probability mass unassigned to individual grades caused by the incompleteness of the assessment. m ̃_(H,i) will be zero if assessment is complete, or ∑_(n=1)^N▒β_(n,i) =1; otherwise, m ̃_(H,i) will be positive. m_(n,I(i)) and m_(H,I(i)) can be generated by combining the basic probability masses m_(n,j) and m_(H,j) for all n=1,…,N,j=1,…,i. Given the previous definitions and discussions, the ER algorithm can be summarized as
In order to test the effectiveness of IGA and GA when solving the timetabling problem, a comparison with the PSO algorithm was performed to investigate trends of performance. All coding was written in MATLAB code and the test case focused on the three above algorithms. All tests were executed on a 3.30 Ghz Intel core i5 processor with 16 GB of ram. The convergence graphs for IGA, GA, and PSO below shows progress until a valid solution for each of the algorithms were discovered. Each of the algorithms simulated 1,000 generations. The graph in Figure 10 - 14 provides a comparison of the proposed algorithm with the conventional population operator based algorithm.
The table bellow contains the unitary cost for Standard and ABC and the throughput per unit of the constrained resource ($/min), calculated diving the unitary ABC cost ($/lb)
The receiving overhead per unit of Flow Controllers produced = (0.78 X 20,000)/ 4000 = $3.9
Great job explaining the load-distance model, thanks for sharing the formula. I must agree this model it’s very useful for organization to predict the arriving time of products. One good example is Chegg, after I purchase a book thought the web page I receiving an estimated arrival time and delivering. It’s very in convent since I can plan on ahead of time its arrival. Another function of the model is to identify the loads between locations, which facilities the delivering process.
The second reason for supporting truckload delivery is the value density. It can be calculated as follows
The experiment results are shown in Table 2. The “summary” represents a combined DTA simulation scenario which summarizes the simulation result from all sub-simulation results. The summary scenario indicates the DTA simulation applying the networks from abstracted network group by different sub-simulation time period. In this table, the summary scenario nodes and links are marked as “-”. “Veh. Num.” and “CPU time/second” of summary scenario denotes the summation of all sub-simulations’ number of vehicles and CPU time in second. The average travel time and average travel distance of summary scenario are the weight average of all sub-simulation scenarios average travel time and travel distance, in which the weights are number of vehicles.
Model and reports for Demand Prioritization, Capacity planning Capacity Utilization, Demand and Revenue Forecasting, Capacity Management.
By dividing the study area into different zones which is called Network Modeling, students could establish the relationship between traffic demand and road network, from these, a further relationship between zones are created and the travel demands are calculated on VISUM. The size of zones varies and determined by the traffic analysis.
Prioritized Quality of Service is expressed in the terms of relative delivery priority, which is used to be within the medium access control data service in the transfer of data frames between peer stations. The values of Quality of Service parameters such as data rate, delay bound, and jitter bound, may be differ in the transfer of data frames, without the need to reserve the required resources by negotiating the Traffic Specification.
In 2002, a new optimization technique was proposed by Passino which is inspired by the foraging strategy of Escherichia Coli (E. Coli) bacteria present in human intestines called Bacteria Foraging Optimization Algorithm (BFOA) [1]. It is a population-based stochastic search algorithm that has been introduced to solve the problem related to optimization and control system. Since its inception, BFOA successfully has drawn the attention of many researchers from diverse fields to exploit its performance as a high-performance optimizer and has been successfully applied in real world applications such as optimal power control [2], image processing [3], jobs scheduling[4], [5] and etc. The advantages that motivate researchers to explore its
The receiving overhead per unit of Flow Controllers produced = (0.78 X 20,000)/ 4000 = $3.9
Chapter 2: Literature Review: In this part, several basic concepts are introduced. We start our chapter by explaining the meaning of optimization and its two main categories which are local optimization and global optimization, also the advantages of using the last mentioned category compared to the first one is mentioned. Accordingly, the most know newly invented global optimization algorithms based on nature behaviors like the GA, PSO and GBSA are introduced. In addition of that, the galaxy based search algorithm is studied well and its
Abstract— This is a new optimization algorithm which mimic the behavior of mosquito to find a hole in mosquito net, if any. Both the flying and sliding motion of the mosquito have been modelled and incorporated in the algorithm. The algorithm was tested for global minima on different type of benchmark functions of various dimension and modality. Namely Gramacy & Lee, Ackley, Rastrigin, Rosenbrock, Griewank and Schwefel functions of one, two, five, ten and thirty dimensions. The experiment was done with thirty different seeds generated randomly for each function and dimension. The algorithm was found to be efficient, convergent and accurate.