BACKGROUND There is little information on the costs of maintaining a district nebuliser compressor service. This retrospective study examines the issue, reliability, and maintenance costs of electrical compressors to assist the prediction of future costs, taking into account recent safety legislation. METHODS Records of issue, repair, and replacement for the period 1982-91 were reviewed. The ...

An approach for preliminary aero-engine design, incorporating a mean-line code the design of axial-flow, multi-stage compressors, is presented. The compressor developed and integrated within framework assessment concepts. It then combined with modules map generation, multi-point engine steady-state transient off-design performance aircraft mission analysis. Implementation examples are presented...

The Axial compressor is an integrated part of a gas turbine. The central part of compressors is its blades. Blade aerodynamic has a significant effect on compressor performance. Because of the adverse pressure gradient in the compressor, any deviation in the blade profile has a significant influence on the flow field as well as the compressor performance. During the manufacturing and operation ...

The design of a family of efficient oil-flooded twin screw air compressors was performed at City University London for Elgi Equipments Coimbatore, India. It was carried out using a software package, which included almost every aspect of the rotor profiling and compressor thermodynamic and geometric modelling with the capacity to transmit calculated output directly into a CAD drawing system. Rac...

For the demand of high speed and high accuracy, the use of active magnetic bearing (AMB) plays a key role in various industries such as clean rooms, compressors and satellites due to their contactless nature. In this research, two other control options for high speed machine were designed based on the optimal output feedback and H∞ output feedback control methods to improve the radical and axia...

The requirement to efficiently store and process SMILES data used in Chemoinformatics creates a demand for efficient techniques to compress this data. General-purpose transforms and compressors are available to transform and compress this type of data to a certain extent, however, these techniques are not specific to SMILES data. We develop a transform specific to SMILES data that can be used a...

Various analysis to calculate the thermodynamic efficiency, the performances of the valve systems and the acoustic characteristics of the gas manifold are integrated in one system with necessary design rules for basic design of compressors. Expert system rule bases are used to identify design problems existing in the model and to suggest directions to improve them. A case study illustrates how ...