Automated Fault Analysis for Hydraulic Systems: Part 2: Applications

Abstract

The paper provides further details of the automated failure modes and effects analysis (FMEA) program outlined in Part 1. Some of the more dijj'jcult development problems are discussed, and solutions are presented. The ,functionality of the program was tested through application to two experimental rigs, namely a closed-loop hydrostatic transmission with a dynamometer and a regenerative pump test rig. Non-destructive faults, such as abnormally low relief valve settings and excessive loads, were manually inserted into these rigs, und the measured Cfects were compared with the predictions from the program lo validale the software. The diference in complexity and contigurution evident in the two examples considered serves to highlight the generality of the approach. The ease ofreconj5gurability oj the software reflects the key aim of producing a program capable of analysing a wide range of hydraulic circuits.

Reliability based design of fluid power pitch systems for wind turbines

“…This approach is similar to the descriptions given by Hogan et al . in the design of an automated failure analysis. It is clear that too low‐ring port pressure or too high piston port pressure prevents the retracting motion.…”

“…Within the general field of fluid power, two categories of qualitative failure analysis are seen to be the subject for research . One category of methods uses expert knowledge of component failure modes and automatically determines fault propagation in a system on the basis of a circuit diagram . The other category also uses a circuit diagram but utilizes component simulation models to determine fault propagation .…”

Modelling and reasoning for failure modes and effects analysis generation

“…Much research has been carried out mainly to provide automatic FMEA report generation. The research reviewed in this paper includes FLAME [4] and Auto-Steve TM [5] for the design of automobile electrical systems, GENMech [6] for mechanical design and research by Atkinson et al [7] and Hogan et al [8] for hydraulic systems design. Bouti et al [9] and Price et al [10] suggested methods for process FMEA application.…”

An On-Line Approach to Fault Diagnosis of Fluid Power Cylinder Drive Systems

“…FMEA applied to fluid power systems has been described in some detail and the effects of single faults in hydrostatic transmissions have been investigated. The approach requires assignment of qualitative variable states, such as high, normal and low, and deep knowledge available at the design stage is integrated within an object-orientated computer toolkit (1,2). Some complex programming problems were encountered, and overcome, for a single system operating point.…”