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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 10 of 64 (0.063 seconds)Spelling suggestions: "subject:"hydraulic systems"" "subject:"dydraulic systems""
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The fluid borne noise characteristics of hydraulic components and their measurementWing, Timothy John January 1982 (has links)
This thesis is concerned with the development of test techniques for evaluating the fluid borne noise characteristics of components found in hydraulic systems; in particular the source impedance and source flow of positive displacement pumps. A number of proposals for measuring the fluid borne noise generation potential of positive displacement pumps are critically reviewed. Particular attention is paid to the high impedance pipe technique which is to be proposed as a British Standard. An apparently simple method of obtaining the source characteristics of a pump using only two transducers is shown to have serious drawbacks due to magnified errors at resonant line length conditions. A computer based scheme, capable of predicting the source and termination characteristics of a pump-pipeline-termination system is developed. The scheme is iterative and based on fitting the surface of least squares error through a series of experimental pressure readings. The technique requires the pressure ripple to be measured at a number of points along a pipeline and for a series of different pipe lengths. A special rig has been designed and built to facilitate the data acquisition. Using the technique, the source flow and source impedance characteristics of a number of axial piston and gear pumps are examined. The results obtained show very good agreement with theory and clearly demonstrate the effects of pressure and speed on the source flow. The impedance of several terminations are also predicted. For an expansion chamber the predicted entry impedance is shown to deviate from simple theory and this is attributed to vibration of the chamber. The impedances of restrictor and relief valves are shown to be quite complicated freqeuncy dependent functions and it is demonstrated that significant errors in pressure ripple prediction may result from the use of over-simplified models.
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| 2 |
Casing treatment in axial compressorsSmith, G. D. J. January 1980 (has links)
No description available.
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| 3 |
Design criteria and economic considerations in the specification of hydraulic loads on agitator drivesPollard, G. J. January 1982 (has links)
No description available.
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| 4 |
The prediction and active control of surge in multi-stage axial-flow compressorsEscuret, Jean-Francois January 1993 (has links)
No description available.
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Centrifugal compressor diffuser studiesInoue, M. January 1980 (has links)
No description available.
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| 6 |
The erosion of pipe bends in pneumatic conveying systemsTong, K. N. January 1981 (has links)
No description available.
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| 7 |
The influence of the physical characteristics of particulate materials on their conveyability in pneumatic transport systemsMartinussen, Svein Erlend January 1997 (has links)
No description available.
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| 8 |
An investigation into the low velocity pneumatic conveying of bulk solidsHitt, R. J. January 1985 (has links)
No description available.
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| 9 |
An examination of the discharge capabilities of blow tanks as feeders for pneumatic conveying systemsAshenden, Stuart John January 1989 (has links)
No description available.
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| 10 |
Analysis and control of splitting ratios of particulate materials at bifurcations in pneumatic conveying pipelinesSelves, Timothy Patrick January 1995 (has links)
No description available.
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