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Lubrication of Mechanical Components in Wind Turbines
Published in Bella H. Chudnovsky, Lubrication of Electrical and Mechanical Components in Electric Power Equipment, 2019
Automatic lubrication systems provide lubricant supply more reliably and precisely to moving components in the nacelle when compared to manual lubrication. By delivering the smallest effective amount of lubricant reliably to all friction points while the machine is running, automatic lubrication systems reduce friction inside bearings and help prevent contamination. The result is optimized bearing service life over the long term, more turbine uptime, and reduced manpower costs, which helps to make wind farms more profitable.
Wind Turbine Lubrication
Published in Bella H. Chudnovsky, Transmission, Distribution, and Renewable Energy Generation Power Equipment, 2017
Compared with manual lubrication, automatic lubrication systems provide lubricant supply more reliably and precisely to moving components in the nacelle. By delivering the smallest effective amount of lubricant reliably to all friction points while the machine is running, automatic lubrication systems reduce friction inside bearings and help prevent contamination. The result is optimized bearing service life over the long term, more turbine uptime, and reduced manpower costs—all combining to help make wind farms more profitable.
Performance analysis of the GI/D-MSP/1 queue with N-policy and its optimal control
Published in Quality Technology & Quantitative Management, 2020
The queueing model with -policy discussed in this paper may be applicable to many real life situations such as in optimal design and control system, production management, flexible manufacturing system, wireless sensor network, inventory control system, computer and multimedia communication system. The provision of threshold policy in queueing environments confirms the proper utilisation of valuable system and economic benefit in which service does not start until a pre-specified number of arrivals are accumulated during idle period. Our model is being able to fit in a manufacturing industry with centralised automatic lubrication system. The lubrication consists of greasing oil to multiple greasing points of many machineries which require lubrication from time to time to enhance the performance and reliability of these machine equipment. We figure out the process of lubrication requests by a single-server queue that has the following features. Arrivals of signals coming from different machineries for lubrication follow general discrete interarrival-time distribution. To get better efficiency in the production of the manufacturing industry during heavy workload, we propose the centralised automatic lubrication system under -policy rule, i.e. after getting signals the controller starts the system to distribute lubrication process instead of functioning of the automatic lubrication system in specified time intervals. The process of lubrication consists of four steps such as pump with reservoir, supply line, metering valves/injectors and feed lines may be considered the states of the D-MSP. The key benefits of using -policy automatic lubrication system are increased machine reliability, reduce wastage of lubricant and optimised maintenance operations. Buzacott and Shanthikumar (1995), and Curry and Feldman (2009) provided several applications of automatic lubrication system in a wide variety of production and manufacturing industries using queueing models. This motivates us to investigate a discrete-time - queueing system under -policy.