Lead Time Analysis of Manufacturing Systems with Time-Driven Rework Operations

2020 ◽  
pp. 153-167
Author(s):  
Alessio Angius ◽  
Marcello Colledani
Keyword(s):  
Lead Time ◽  
Manufacturing Systems ◽  
Time Analysis

scholarly journals CONWIP versus POLCA: A comparative analysis in a high-mix, low-volume (HMLV) manufacturing environment

2016 ◽  
Vol 9 (2) ◽  
pp. 432 ◽  
Author(s):  
Todd Frazee ◽  
Charles Standridge
Keyword(s):  
Discrete Event Simulation ◽  
Lead Time ◽  
Manufacturing Systems ◽  
Discrete Event ◽  
Model Verification ◽  
Manufacturing Environment ◽  
Event Simulation ◽  
Work In Process ◽  
Low Volume ◽  
Average Lead

Purpose: Few studies comparing manufacturing control systems as they relate to high-mix, low-volume applications have been reported. This paper compares two strategies, constant work in process (CONWIP) and Paired-cell Overlapping Loops of Cards with Authorization (POLCA), for controlling work in process (WIP) in such a manufacturing environment. Characteristics of each control method are explained in regards to lead time impact and thus, why one may be advantageous over the other.Design/methodology/approach: An industrial system in the Photonics industry is studied. Discrete event simulation is used as the primary tool to compare performance of CONWIP and POLCA controls for the same WIP level with respect to lead time. Model verification and validation are accomplished by comparing historic data to simulation generated data including utilizations. Both deterministic and Poisson distributed order arrivals are considered. Findings: For the system considered in this case study, including order arrival patterns, a POLCA control can outperform a CONWIP parameter in terms of average lead time for a given level of WIP. At higher levels of WIP, the performance of POLCA and CONWIP is equivalent. Practical Implications: The POLCA control helps limit WIP in specific áreas of the system where the CONWIP control only limits the overall WIP in the system. Thus, POLCA can generate acceptably low lead times at lower levels of WIP for conditions equivalent to the HMLV manufacturing systems studied.Originality/value: The study compliments and extends previous studies of  CONWIP and POLCA performance to a HMLV manufacturing environment. It demonstrates the utility of discrete event simulation in that regard. It shows that proper inventory controls in bottleneck áreas of a system can reduce average lead time.

Lead time estimation in MRP/ERP for make-to-order manufacturing systems

2012 ◽  
Vol 139 (2) ◽  
pp. 551-563 ◽  
Author(s):  
George Ioannou ◽  
Stavrianna Dimitriou
Keyword(s):  
Lead Time ◽  
Manufacturing Systems ◽  
Time Estimation ◽  
Make To Order

Crop yield forecasting and associated optimum lead time analysis based on multi-source environmental data across China

2021 ◽  
Vol 308-309 ◽  
pp. 108558
Author(s):  
Linchao Li ◽  
Bin Wang ◽  
Puyu Feng ◽  
Huanhuan Wang ◽  
Qinsi He ◽  
...  
Keyword(s):  
Crop Yield ◽  
Lead Time ◽  
Environmental Data ◽  
Time Analysis ◽  
Yield Forecasting ◽  
Crop Yield Forecasting

Incorporation, Programming and Use of an ABB Robot for the Operations of Palletizing and Depalletizing at an Academic Research Oriented to Intelligent Manufacturing Cell

2013 ◽  
Vol 282 ◽  
pp. 127-132 ◽  
Author(s):  
Radovan Holubek ◽  
Karol Velíšek
Keyword(s):  
Intelligent Control ◽  
Manufacturing Systems ◽  
Manufacturing System ◽  
Current Trend ◽  
Academic Research ◽  
Functional Condition ◽  
Intelligent Manufacturing ◽  
Production Cycle ◽  
Time Analysis ◽  
Assembly Cell

The current trend of the final product quality increasing is affected by time analysis of the entire manufacturing process The primary requirement of manufacturing is to produce as many products as soon as possible, at the lowest possible cost, but of course with the highest quality. Such requirements may be satisfied only if all the elements entering and affecting the production cycle are in a fully functional condition. These elements consist of sensory equipment and intelligent control elements that are essential for building intelligent manufacturing systems. Intelligent manufacturing system itself should be a system that can flexibly respond to changes in entering and exiting the process in interaction with the surroundings. Philosophy that we apply to solve the problem rise from intelligent assembly cell by building on our institute of manufacturing systems and applied mechanics Essential philosophy is integrate of interconnection between palletizing- depalletizing robot and Intelligent assembly system by the means mobile robot Robotino.

scholarly journals Application of lead time analysis as a method in EU co-funded mid-term programme evaluations in 2007–2013: the case of Bulgaria and Malta

2014 ◽  
pp. 9-14
Author(s):  
Balázs Mezősi
Keyword(s):  
Lead Time ◽  
Objective Analysis ◽  
Lead Times ◽  
Time Analysis ◽  
Application Process ◽  
Programme Implementation ◽  
Term Evaluation

Mid-term evaluation of grant programmes always aims to assess the efficiency of programme implementation. An important aspect of assessing efficiency is the lead times of the application mechanisms. A detailed and objective analysis of lead times may set the scenes for an in-depth evaluation of the relevant entities in the application process in terms of capacity,competences or the process itself. The Bulgarian regional operational programme (OPRD) and the Maltese ESF operational programme (OPII) mid-term evaluations offer an opportunity to see application of this method on the ground with a view on results and comparisons. This article attempts to provide an overview on lead time analysis, being a simple but powerful tool for evaluation with great benefits and also great potential pitfalls in terms of use and interpretation.

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