Mechanical Engineering Commons^™

The Development And Testing Of A Fluidic/Pneumatic Position Servo, David Lyle Portin

Dissertations and Theses

This thesis reviews the design and analysis of a fluidic/pneumatic position servo. Rolling diaphragm piston actuators are used for the system drive, and a hydrostatic gas journal bearing is used as the position sensor. The servo has a 1 inch range which is monitored using an electrical capacitive position transducer that was built as an integral part of the system.

Open-loop frequency response testing provides the basis for a mathematical model of the system.

The servo response is linear at frequencies up to 3 Hertz.

The frequency response appeared to be limited by the design of the gas bearing sensor, …

Effect Of Compliant Wall Motion On Turbulent Boundary Layers, Dennis M. Bushness, Jerry N. Hefner, Robert L. Ash

Mechanical & Aerospace Engineering Faculty Publications

A critical analysis of available compliant wall data which indicated drag reduction under turbulent boundary layers is presented. Detailed structural dynamic calculations suggest that the surfaces responded in a resonant, rather than a compliant, manner. Alternate explanations are given for drag reductions observed in two classes of experiments: (1) flexible pipe flows and (2) water-backed membranes in air. Analysis indicates that the wall motion for the remaining data is typified by short wavelengths in agreement with the requirements of a possible compliant wall drag reduction mechanism recently suggested by Langley. Copyright © 1977 American Institute of Physics.

The Analysis Of The Deflection And Containment Of A Hot Plume By Side Draft Exhaust Hooding, Douglas H. Macgowan

Dissertations and Theses

A common industrial ventilation and pollution problem results when a thermally buoyant polluted plume of air must be exhausted away from a work area to allow achievement of air pollution standards. Generally, a close fitting canopy hood is one of the most effective means of exhaust containment; however, physical restrictions or the operation itself often prevent such an arrangement, and a hood located to the side of the operation is required. This arrangement requires the exhaust to bend and contain the vertically rising plume with a horizontal sweep of exhaust air across the surface of the operation.

A review of …

Tree-Covered Land-Forms For Noise Control, David I. Cook, David F. Haverbeke

Nebraska Agricultural Experiment Station: Historical Research Bulletins

The objective of this study was to determine means for controlling intrusive noise by combining trees and shrubs with land-forms or other solid barriers. The solid barriers would provide some immediate relief, and the plant materials would increase the protection as they matured.

Historical Sketch Of Tractor Testing, Tractor Museum

Individuals Associated with the Nebraska Tractor Test

No abstract provided.

Faulty Germination Of Lupin Seeds, B J. Quinlivan

Journal of the Department of Agriculture, Western Australia, Series 4

THE number of lupin seed samples tested in the seed laboratory over the last few years has shown a marked increase with the increasing popularity of lupins as a cash crop.

A seed with satisfactory germination is one which produces a healthy seedling. The germination of lupin samples tested in the laboratory has varied markedly.

Australian Tractor Test Report No. 58 : Massey-Ferguson 165, G H. Vasey, W. T. Brown

Journal of the Department of Agriculture, Western Australia, Series 4

THE Massey-Ferguson 165 is a general purpose farm tractor. The test tractor gave 50 drawbar h.p. with 59 h.p. at the P.T.O. at rated engine speed it comes within Class 5 of the Australian Standard Classification of Wheeled Tractors for Agricultural Purposes, AS Dl 0-1967. It is equipped with 18.4 x 28 in. pneumatic tyres. It has a threespeed gear box with a ratio change giving 6 forward and reverse speeds.

Australian Tractor Test Report. No. 56. Zetor 5511, G H. Vasey, W. F. Baillie

Journal of the Department of Agriculture, Western Australia, Series 4

AUSTRALIAN TRACTOR TEST REPORT

The Zetor 5511 is a general purpose farm tractor. With 43 drawbar horsepower and 51 h.p. at the P.T.O. at rated engine speed it comes within Class 5 of Australian Standard Classification of Wheeled Tractors for Agricultural Purposes, A.S. Dl0-1967. It is equipped with 18.4 x 28 pneumatic tyres.

It has a five-speed gear box with a High and Low ratio change giving 10 forward and 2 reverse speeds

Super Spreader Distributes Snail Baits, G D. Rimes, W. M. O'Donnell

Journal of the Department of Agriculture, Western Australia, Series 4

THE problem of distributing snail bait on broad acres has been overcome by simple modifications to a conventional super spreader.

The Setting And Control Of Disc Ploughs, P A. Taylor

Journal of the Department of Agriculture, Western Australia, Series 4

THE trailed disc plough is the most commonly used tillage implement in Australian broadacre farming, yet it is considered in some areas to be difficult to set and to operate. These notes provide information resulting from C.S.I.R.O. research to assist operators in the control and operation of trailed disc ploughs.

How Many Acres Per Hour?, J G. Drever

Journal of the Department of Agriculture, Western Australia, Series 4

MANY farm tractor operators don't know exactly how much land is covered in an hour by implements drawn by their tractors. This information, useful on any farm where tractors are used, is of particular value in contract work.

The capacity of the machine or implement, or in other words, its rate of working, depends on the width of the machine, how fast it travels, how efficiently it is operated and the time it works.

Australian Tractor Test Report No. 53 : Chamberlain Countryman 354, G H. Vasey, W. F. Baillie

Journal of the Department of Agriculture, Western Australia, Series 4

AUSTRALIAN TRACTOR TEST REPORT

No. 53 - CHAMBERLAIN COUNTRYMAN 354

THE Chamberlain Countryman 354 is a broad-acres cultivation tractor of 77 drawbar horsepower with 87 h.p. at the P.T.O.

Australian Tractor Test Report No. 54 : Fiat 615, G H. Vasey, W. F. Baillie

Journal of the Department of Agriculture, Western Australia, Series 4

AUSTRALIAN TRACTOR TEST REPORT

No. 54 - FIAT 615

The tractor is designed for working either with mounted implements directly through the three-point linkage or through the drawbar.

Four Mobile Picking And Pruning Platforms For Orchards, J C. Rowbotham

Journal of the Department of Agriculture, Western Australia, Series 4

Shifting ladders around the orchard takes a great deal of time and effort at picking and pruning time.

This article describes four home made labour savers which take most of the ladder work out i f these operations.

Australian Tractor Test Report No. 52 : Chamberlain Champion 306, G H. Vasey, W. F. Baillie

Journal of the Department of Agriculture, Western Australia, Series 4

AUSTRALIAN TRACTOR TEST REPORT

No. 52 - CHAMBERLAIN CHAMPION 306

THE Chamberlain Champion 306 is a general purpose farm tractor of 57 drawbar horsepower with 68 h.p. at the P.T.O.

Australian Tractor Test Report No. 55 : Nuffield 4/65, G H. Vasey, W. F. Baillie

Journal of the Department of Agriculture, Western Australia, Series 4

THE Nuffield 4/65 is a general purpose farm tractor of 49 drawbar horsepower.

With 54 h.p. at the P.T.O. at rated engine speed it comes within Class 5 of the Australian Standard Classification of Wheeled Tractors for Agricultural Purposes, AS D10-1967. I t is equipped with 18.4 x 30 pneumatic tyres.

It has a five speed gear box with a High and Low ratio change giving 10 forward and 2 reverse speeds.

Australian Tractor Test Report No. 49 : Mccormick International 624, G H. Vasey, W. F. Baillie

Journal of the Department of Agriculture, Western Australia, Series 4

AUSTRALIAN TRACTOR TEST REPORT

No. 49 - McCORMICK INTERNATIONAL 624

Eight Tractors In The 35-45 H.P. Class. Part 2, W F. Baillie, G. H. Vasey

Journal of the Department of Agriculture, Western Australia, Series 4

Summary report of tests on tractors in the 35-45 h.p. class by the Australian Tractor Testing Committee, based on Tractor Tests Nos. 38 to 45.

Eight Tractors In The 35-45 H.P. Class. Part 1, W F. Baillie, G. H. Vasey

Journal of the Department of Agriculture, Western Australia, Series 4

Summary report of tests on tractors in the 35-45 h.p. class by the Australian Tractor Testing Committee, based on Tractor Tests Nos. 38 to 45. Part 1

Mastitis : Modified Teat Cups Give Better Back-Flushing, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

Back-flushing of the teat cups has not brought the expected reduction in the spread of mastitis in some dairy herds.

Replacement of the conventional nut-and-tail nipple with a special flushing nipple, or use of a one-piece teat cup liner, will ensure that flushing is efficient.

Australian Tractor Test Report No. 41 : The Massey-Ferguson 135, G H. Vasey, F. T. Baillie

Journal of the Department of Agriculture, Western Australia, Series 4

THE Massey-Ferguson MF-135 is a general purpose tractor of 31 drawbar horsepower. It has 14.9 x 24 pneumatic tyres, and a three-speed gear box with a ratio change which, in the standard model, gives six forward and two reverse gears.

The model tested was also fitted with the optional "Multipower" facility, which gives an "on-the-go" shift to a higher speed for each gear, thus providing 12 forward and four reverse gears.

Milking Machine Efficiency And Shed Husbandry Practices, G R. Olney

Journal of the Department of Agriculture, Western Australia, Series 4

MILKING machine efficiency on dairy farms in the Bridgetown, Greenbushes, Balingup, Boyup Brook and Nannup areas was the subject of a recent testing survey.

During the survey 106 machines were tested and the results assessed statistically to gauge the general level of machine efficiency in these districts.

A Simplified Mulesing Crush, G T. Halpin

Journal of the Department of Agriculture, Western Australia, Series 4

DURING the last two years Mr. Tom Flanigan, a mulesing contractor in a large area centred at Katanning, has performed the mules-tailstrip operation on many thousands of lambs and sheep.

Opposed Disc Plough Furrows Hard Kimberley Soils, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

THE work of reclaiming the eroded areas of the Ord River catchment has posed special problems for field staff of the Department of Agriculture engaged on this large scale project.

Thousands of miles of furrows must be contour-ploughed and seeded in extremely hard ground over big areas of eroded country.

Farm Safety, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

Careful investigation has been made into the causes of tractors overturning.

The most common types of accident are set out below, with advice on how to avoid them.

A Core Sampler For Silage, A L. Hamilton

Journal of the Department of Agriculture, Western Australia, Series 4

FOR five years now the Dairy Division of the Department of Agriculture has conducted a silage competition on behalf of the Australian Dairy Produce Board Pasture Improvement Committee.

The competition is for farmers in the Southwest dairying districts and has attracted an increasing number of entries each year.

A Practical Guide To Building Contour Banks With A Road Grader, J E. Watson

Journal of the Department of Agriculture, Western Australia, Series 4

THOUSANDS of miles of contour banks have been built in Western Australia, and most of this earthmoving has been done by tractor and disc plough* or by road grader.

This article describes the technique recommended for bank construction with the road grader.

Siphon Tubes For Furrow Irrigation In The Kimberleys, K S. Cole

Journal of the Department of Agriculture, Western Australia, Series 4

Irrigation soils in the Ord River area have a high clay content and erode easily under the influence of running water.

To overcome the problem of erosion in cuts between the head channels and irrigation furrows polythene siphon tubes have been found the most satisfactory.

In this article K. S. Cole, B.Sc. (Agric), Agricultural Adviser, Kununurra, describes the use of siphon tubes for furrow irrigation in the Kimberleys.

Irrigating Dry Season Crops In The Ord Valley : How To Prepare Land For Sowing, D F. Beech

Journal of the Department of Agriculture, Western Australia, Series 4

THE best way to grow dry season crops of safflower, linseed and rapeseed under irrigation in the Ord Valley is by sowing on to broad flat ridges, separated by small furrows 3 ft. 6 in. apart.

This system of sowing is called the "corrugation" method.

The Effects Of Tillage Implements On Cereal Yields, H M. Fisher

Journal of the Department of Agriculture, Western Australia, Series 4

Careful soil preparation is essential for cereal crops grown without fallow on clover ley land.

Crops give better yields where the land is broken up with a mouldboard or disc plough rather than a scarifier or similar machine.

The implements differ appreciably in their capacity to control weed growth and this is largely responsible for variations in cereal yields. "Takeall" disease is reduced by efficient weed control.