Engineering news
A method for hydraulic component life prediction
Breakdowns of components in manufacturing equipment are costly and need to be avoided. This paper shows a prognostics approach to the hydraulic system of a machine tool.
Whilst failure of any of the components in the system causes costly loss of production, preventative maintenance applied to such a system is in itself very expensive.
Therefore, a solution using Prognostics and Health Management (PHM) is proposed.
PHM is the subject of several ISO standards. The PHM framework consists of four modules i.e. preliminary analysis, profile monitoring, diagnosis and prognosis (remaining useful life).
Owing to the lack of useful data on the life of a machine tool a digital twin of the hydraulic unit was set up. The digital twin enabled simulation of the system experimentally and this allowed the validation of the model which was shown to be robust.
Title: A novel prognostics solution for machine tool sub-units: The hydraulic case
Authors: Luca Bernini, David Waltz, Paolo Albertelli, Michelle Monno
Proc IMechE, Part B, J Engineering Manufacture
2022 Vol 236(9) 1199-1215
A novel method for tolerancing of an aero engine casing
The assembly quality of an aero engine casing governs the performance of the whole engine and both the function and the dynamic performance are governed by the tolerancing. However, during the design phase of an aero engine casing tolerancing is usually conducted without considering the impact on the dynamic characteristics of the engine. This paper proposes a method for the integration of the precision of the manufacturing process with dynamic performance optimization.
Initially the 3D assembly tolerance model of the aero engine casing was constructed.
Using this model the flexibility of the casing which affects its dynamic performance can be studied, treating the casing as a thin-walled cylindrical shell. Then the dynamic performance of the casing can be studied and optimized for different values of radial and axial tolerances. Hence leading to the best tolerance values.
Title: A novel method to design tolerance of aero-engine casing by integrating 3-D assembly tolerance with performance instability
Authors: Hehe Kang, Zhi-Min Li, Tao Liu, Wei Yuan and Yuping Wu
Proc IMechE, Part B, J Engineering Manufacture
2022 Vol 236(8) 1052-1070
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