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Abstract
Hydraulic drive systems are widely used in a variety of industrial applications where high torque and low speed rotational power are required. The advantages include maximum torque from zero speed, continuously variable speed within wide limits, high reliability and insensitivity to shock loads. A drive system consists of a hydraulic circuit, electric motors, hydraulic pumps, hydraulic motors and auxiliary components. The stress on the components, and hence wear and failure rate, varies with the torque and speed output by the drive. The reliability of a hydraulic drive system of a particular design can therefore vary significantly between installations operating in applications with different functional requirements. Predicting the availability of a drive system in a particular application is useful for several purposes such as optimising the system design and estimating support costs. This paper describes a simulation model, developed to estimate the availability of a hydraulic drive system in a given functional profile, consisting of output torque and speed time phase requirements. It outputs statistics on system availability and component failure rates. As an example, the simulation model is used to compare these statistics for a drive design operating under two distinct operational profiles.
Highlights
Hydraulic drive systems are very versatile and are used to provide rotational power in many different industrial applications with wide ranging functional requirements of torque, speed and operating duration
Such estimates are very useful for purposes such as quality assurance and publication in the data sheets of sales literature. They did not previously have an easy way to predict availability for a complete hydraulic drive system of a particular design operating under the distinct functional operating profile of a particular application. This ability is important to the manufacturer if they need to guarantee a certain level of availability and bear the costs of maintenance support for providing specific functionality to a customer in a specific application, as is the case with the functional product (FP) business model [2]
A simulation model is presented in this paper that has been developed by the authors to act as a virtual test bed and produce detailed availability and maintenance support statistics for any hydraulic system design and functional operating profile
Summary
Hydraulic drive systems are very versatile and are used to provide rotational power in many different industrial applications with wide ranging functional requirements of torque, speed and operating duration. Such estimates are very useful for purposes such as quality assurance and publication in the data sheets of sales literature They did not previously have an easy way to predict availability for a complete hydraulic drive system of a particular design operating under the distinct functional operating profile of a particular application. This ability is important to the manufacturer if they need to guarantee a certain level of availability and bear the costs of maintenance support for providing specific functionality to a customer in a specific application, as is the case with the functional product (FP) business model [2].
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