Feb 03, 2017 the purpose of this study is to first investigate the efficiency of the most commonly used performance measures for minimizing the number of workstations nws in approaches addressing simple assembly line balancing problem salbp for both straight and ushaped line, and second to provide a comparative evaluation of 20 constructive heuristics to find solutions to the salbp1. A novel assembly line balancing method based on pso algorithm. Assembly line balancing problem is a crucial question during design and management of assembly lines since it directly affects the productivity of the whole manufacturing system. The concept of an assembly line al came to the fact when the finished product is inclined to the perception of product modularity. The assembly line balancing proble m has recei ved considerable attention in the literature, and many studies have been made on this subjec t since 1954 s. Pdf line balancing techniques for productivity improvement. Project index, line and balance efficiency will be illustrated for a published testcase examined by the a.
Assembly line is widely used in manufacturing system. Smoothness index is calculated by the following formula. A critique of some current assembly line balancing techniques. Tabel perhitungan smoothness index dapat dilihat pada tabel 6. The model of assembly line balancing problem is put forward and a general optimization method is proposed. This is the index to indicate the relative smoothness of a given assembly line balance. Through this algorithm, the assembly line setup with the minimum smoothness index is determined. Abstract in this paper a problem of twosided assembly line balancing problem and just in time strategy is considered. Assembly line balancing alb and sequencing is an active area of.
Heuristic procedure for the assembly line balancing problem with. Assembly line balancing to improve productivity using work sharing method in apparel industry. Line balancing is the problem of assigning operation to workstation along an assembly line, in such a way that assignment is optimal in some sense. Heuristic algorithm for twosided assembly line balancing. Also there is another very important aim of line balancing, which is aligning the assembly line according to the demand, by the concept of takt time. Findings minimizing the smoothness index is not necessarily equivalent to minimizing the nws. Repetitive process a product layout, production lines or assembly lines are design to allow a direct material flow product layout that uses standard processing operations to achieve smooth, rapid and highvolume flow. Different balances occur in different quality of final results. The selection criterion was based on minimum assembly time for all methods. Introduction companies engaged in mass productionuse assembly line balancing to design its assembly line by taking n ecessary input. A group genetic algorithm gga was developed for assembly line balancing problem of sewing lines with different labour skill levels.
The result of the balance delay bd calculation is 23. Smoothness index indicates the smoothness of flow of product through the assembly line. Assembly line balancing is a production strategy that sets an intended rate of production to produce a particular product within a particular time frame. Assembly line balancing operations management algorithms. The performance of the initial production line model was the smoothness index of 2007. Three assembly line processing layouts were developed based on output of assembly methods the output that represent cycle time 10 min improved line efficiency to 82.
Workload smoothing in twosided assembly lines emerald insight. The assembly line balancing problem aims at assigning assembly operations to a set of workstations in order to optimize some performance measures, while satisfying technological, operational, and. Multirule multiobjective simulated annealing algorithm for. Since 1954, a large number of articles on assembly line balancing have appeared in. Key advantage of using manual assembly line is specialization of labor by. Pdf assembly line balancing methodsa case study semantic.
Assembly line balancing is the process of grouping the tasks of precedence network of a product. It involves many production lines while normal linebalancing may only involve one production line. Tk ct2 where tk is the total time in workstation k. Just in time strategy in balancing of twosided assembly. A smoothness indeed is zero indicates perfect balance. Index softness index, which measures the difference between the maximum. The key data on assembly line balancing problem is. Workload smoothing in twosided assembly lines emerald.
Two line balancing methods were studied and used to balance the assembly line. Line efficiency is the ratio of work stations time to the cycle time multiplied by the number of stations and smoothness index is an index that becomes the relative refining index of an assembly line balance. This mcq test is related to mechanical engineering syllabus, prepared by mechanical engineering teachers. Some measures of solution quality have appeared in line balancing literature. Ushaped assembly line balancing with grouping evolution. Three major categories of processes used to accomplish the assembly of the components. Find the idle time and efficiency of balancing line efficiencybalance efficiency. Assembly line balancing in an electronics company using simulation.
Explain one heuristic algorithm specific to line balancing problem. Module 8 line balancing, location and layout nptel. Mixed assembly line balancing method in scenarios with. The smaller balance delay means the less idle time idle an assembly line balancing. Line balancing techniques to improve productivity using work. The performance criteria considered are the number of workstations, the line efficiency, the smoothness index before trade and transfer, and the smoothness index after trade and transfer. Landasan teori line balancing menurut gaspersz 2004, line balancing merupakan penyeimbangan penugasan elemenelemen tugas dari suatu assembly line ke work stations untuk meminimumkan banyaknya work station dan meminimumkan total harga idle time pada semua stasiun untuk tingkat output tertentu. Paper open access improving assembly line balancing using.
Abstract line balancing is an effective tool to improve the throughput of assembly line while reducing nonvalueadded activities, cycle time. Assembly line balancing involved the action of assemble different parts together. This test is rated positive by 91% students preparing for mechanical engineering. Improvement of garment assembly line efficiency using line. Perfect balance is indicated by smoothness index 0. A smoothness index of zero indicates a perfect balance workstation ws. Heuristic procedure for the assembly line balancing problem with postural load smoothness. Problem of assigning tasks to assembly line is known more than 60 years. Assembly line balancing problem with quality inspection stations. The study resulted in the minimization of work stations. Figure1depicts both abovementioned lines, it shows simple, twosided, and multimanned assembly lines with three stations each. Assembly systems and line balancing discrete products are assembled from components.
Line balancing is an important issue, in this regard an optimal or near optimal balance can provide a. Line efficiency is the ratio of work stations time to the cycle time multiplied by the number of stations and. The simulation results show that the pso algorithm can optimize assembly line balancing problem with the highest assembly line balance rate and the smallest discrete conditions than the other two methods, which. The manufacturing unit follows a sequence of operations, and possible to utilize a fixed path. Early criteria for judging assembly lines use balance delay and smoothness index, both are flawed as criteria. The task of balancing of assembly lines is of considerable industrial importance. International journal of occupational safety and ergonomics. Please do some maths and check the answer is correct or not. Oct 05, 20 a smoothness index of zero indicates a perfect balance workstation ws. Mar 30,2021 assembly line balancing 11 questions mcq test has questions of mechanical engineering preparation.
Heuristic procedure for the assembly line balancing. The method used in optimizing line balancing is the rank positional weight rpw method by calculating the amount of processing time, balance delay, smoothness index, the largest track efficiency, and station efficiency. Such performance indexes are the line efficiency, station smoothness inde. Calculate the line efficiency, balance delay and smoothness index. Through line balancing we are eliminating one of the 8 wastes of lean manufacturing.
Heuristic procedure for the assembly line balancing problem. In this paper, a multiobjective genetic agorithm to solve assembly line balancing problems is proposed. Paper open access improving assembly line balancing. Assembly line balancing, genetic algorithm, crossover operation, mixedmodel, model sequencing, makespan 1. Line and balance efficiency are developed as more appropriate. A benders decomposition algorithm with combinatorial cuts. A multiobjective genetic algorithm for solving assembly line.
Hasil penelitian yang menunjukkan keseimbangan lintasan perakitan terbaik diperoleh menggunakan. Thus we prepare the assembly line for delivering the right quantity according to the demand. A comparative evaluation of assembly line balancing heuristics. Smoothness index optimization perturbation method example 3. Assembly lines are popular as production layout since more than 100 years. Stmax maximum station time in most cases cycle time, sti station time of station i. A manual assembly line balancing was done by all the three methods of lcr. A comparative evaluation of assembly line balancing. Perhitungan assembly line balancing dilakukan menggunakan metode ranked positional weight, largest candidate rule dan region approach, dengan nilai idle time, line efficiency, balance delay dan smoothness index sebagai parameter penilaian. The algorithm works by perturbing the initial solution obtained by the simple method and moving in a direction which reduces the smoothness of the line.
There are two conditions taht usually appear in assembling process. Assembly line balancing is the problem of assigning operations to workstations along an assembly line, in such a way that the assignment be best in some sense. Assembly lines are useful for mass production of standard as well as customized products. This research is mainly concerned with objectives of minimizing the number of workstations, improvement of smoothness index, mean absolute deviation mad and increasing line efficiency. Smoothness index sidescribes relative smoothness for a given assembly line balance. The performance criteria considered were the number of workstations, the line efficiency, the smoothness index before trade and transfer, and the smoothness index after trade and transfer. Line balancing, line balancing operations management. Also, the assembly line needs to be designed effectively and tasks needs to be distributed among workers, machines and work stations ensuring that every line segments in the production process. Line balancing how to do it know industrial engineering. Nptel mechanical engineering project and production. Results obtained from the study show that the efficiency of the line increased from 88.
Assign tasks to first workstation, using rules and staying within cycle time. The trade and transfer phase of the moodie and young method is applied to all heuristics, then the. Pdf this paper presents an effective approach for balancing assembly operations with criteria to meet takt time by introducing a new parameter. Repeat for following workstations until all tasks are assigned. Smoothness index this is the index to indicate the relative smoothness of a given assembly line balance.
Assembly line balancing problem with reduced number of. Heuristics for mixed model assembly line balancing problem. Based on the cited studies, ranked positional weight technique was noted to be suitable for improving garment assembly line efficiency. Matlab simulation software was used in the analysis of the primary and secondary data obtained from the assembly line under study. Special attention was given to the quality of final results. Assembly line balancing is an essential engineering task for effective production and requires a larger amount of information that is related to the product such as processing method, processing time, precedence on which the work is carried out and flow structure of the work. To understand better the problem a numerical example is discussed. The process of assigning tasks to workstations in such a way that the workstations have approximately equal time requirements. Also, the assembly line needs to be designed effectively and tasks needs to be distributed among workers, machines and work stations ensuring that every line segments.
This project mainly focuses on improving overall efficiency of single model assembly line by reducing the bottleneck activities, cycle time and distribution of work load at each work station by line. Jokhar assembly systems and line balancing assembly involves the joining together of two or more separate parts to form a new entity, called a subassembly, an assembly or some similar name. Assembly line balancing to improve productivity using work. In this video various terminologies like balance d. It consists of assigning operations to workstations in a production line in such a way that 1 no assembly precedence constraint is violated, 2 no workstations in the line takes longer than a predefined cycle time to perform all tasks assigned to it, and 3 as few workstations as possible are needed to. Assembly line balancing may be defined as assigning number of work elements to various workstations so as to maximize balancing efficiency or to minimize number of workstations or to accomplish any other given objective function for a given volume of output without violating the precedence relationship. The purpose of this paper is to define new criteria for measuring workload smoothness of twosided assembly lines and propose an algorithm to solve a twosided assembly line balancing problem focusing on distributing the idle time and the workload as evenly as possible among the workstations. Keywordsheuristic methods, assembly line balancing problem, critical path method, simple assembly line balancing. Balance the line for the following precedence diagram. Using the taguchi method to optimize the differential evolution algorithm parameters for minimizing the workload smoothness index in simple assembly line balancing. The application of fuzzy logic in balancing a single model tricycle assembly line is presented in this study.
The results of research that shows the best of assembly line balancing were obtained by calculations using region approach method with an idle time value 191,22 seconds, line efficiency 85%, balance delay 15%, smoothness index 19,12 and work stations totaling 10. Precedence constraint precedence constraint is a restriction on the order of execution of work elements. The processes used to accomplish the assembly of the components can be divided into three major categories. Jan 01, 2014 smoothness index sidescribes relative smoothness for a given assembly line balance. Assembly line balancing alb and sequencing is an active area of optimization research in operations management. This is first of the 2 videos on assembly line balancing under the subject industrial engineering. The definition of assembly line balancing difficulty and. Just in time strategy in balancing of twosided assembly line. Line balancing techniques to improve productivity using.
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