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Lean Preparation
Published in Gisi Philip, Sustaining a Culture of Process Control and Continuous Improvement, 2018
OEE is composed of three components multiplied together to establish a value. They include performance, availability and quality or Performance×Availability×Quality=OEE Availability is the amount of time equipment is operational during the period of planned usage (e.g. uptime). Performance is the amount of production realized divided by planned production relative to established standards and available time. Quality is the percentage of product that meets specifications (e.g. no defects). Sometimes, this is referred to as “first run yield”, “first pass yield” or simply “yield”.
Artificial Intelligence and Medical Devices
Published in Frank M. Groom, Stephan S. Jones, Artificial Intelligence and Machine Learning for Business for Non-Engineers, 2019
Once these devices are “connected”, they have the inherent capability to transmit data real time. The immediate benefit with the connected devices is the ability to monitor (1) the patient’s health in real time or (2) the ability to monitor high-cost medical equipment. Monitoring patient health enables care providers to keep close tabs on patients and to react to health indicators more quickly. Monitoring equipment enables the service operations of equipment manufacturers to quickly react to equipment downtime and maintain uptime and availability of the high-cost equipment.
Reliability
Published in Anton F. P. van Putten, Electronic Measurement Systems, 2019
The availability of the considered maintainable system is defined as the probability that the system is in an operational state at any time t given that the system was fully operational at the time t = 0. An alternative definition, more easily understood, is based on the ratio of the time that the system is operational, the so-called ‘uptime’, to the total amount of time that the system is needed. If the time for maintenance and repair is called the ‘downtime’, we can write
A comparative study of overall equipment effectiveness measurement systems
Published in Production Planning & Control, 2022
Fatma Kechaou, Sid-Ali Addouche, Marc Zolghadri
The version of SEMI E79, available in (SEMI 2014), provides metrics for measuring equipment productivity. The model considers the total time and excludes the non-scheduled time (e.g. shutdown and training) to calculate the operations time. The equipment uptime excludes from operations time, the equipment downtime that includes scheduled downtime (e.g. preventive maintenance and production tests) and unscheduled downtime (e.g. maintenance delay and out of specification input). Finally, the productive time is calculated by eliminating the engineering experiments (on the process or the equipment) and the standby time (e.g. lack of operator or product) from the equipment uptime. If these characteristic times can be measured, OEE and its components can be determined by following the calculation procedure below. Otherwise, OEE and its components are calculated according to formula (5). As a result, the SEMI model is time and quantity based.
Models and algorithms for throughput improvement problem of serial production lines via downtime reduction
Published in IISE Transactions, 2020
Throughput is one of the most important performance indicators for manufacturing systems, since it is directly related to a company’s profitability. Companies often face the problem of how to improve the system throughput, which is affected by various factors in complicating ways and is difficult to analyze. Among the relevant factors, machine unreliability plays an important role. In a case study on a production line of Scania, the increment of throughput was up to 5.5% through repair time reduction (Colledani et al., 2010). Increasing the time-to-failure (uptime) and decreasing the time-to-repair (downtime) are effective ways to achieve throughput improvement through operation and management measures. Compared with the high cost of machine upgrading and production loss during system change, operation and management measures are at lower cost and can be conducted more frequently than physical changes to the system. For instance, preventive maintenance can prolong the time-to-failure, whereas developing standard procedures and training operators can be helpful in downtime reduction. This article will focus on improving throughput by downtime reduction in serial lines. Specifically, we will decide the downtime of which failure modes of which machines should be reduced to achieve effective improvement at the system level.