propeller shaft design calculation pdf

Propeller; For a given ship speed,if diameter of the propeller increases,frequency of revolution decreases.Propeller efficiency increase with increasing diameter and fuel consumption decrease.So diameter of propeller should be as large as possible so that maximum amount of … D = required solid shaft diameter, mm H = power at rated speed, kW K = shaft design factor, 1.1 for Keyed propeller connection R = rated speed, rpm U = ultimate tensile strength H = 309.00 kW K = 1.26 R = 1100.92 rpm U = 799.80 Mpa D = 62.46 mm D = 2.46 in Shafting Calculation eyemarine@ns.sympatico.ca 2 www.eyemarine.com 0000006546 00000 n Local yield will normally not be a decisive criterion for marine shafts. 0000013947 00000 n For spacer shafts the table gives the maximum allowable offset for 1 . And on the other hand, the shear stress is generated at the inner most fiber. 0000003979 00000 n 419 31 0000010787 00000 n 0000001877 00000 n 0000008701 00000 n 0000079490 00000 n Both a piston driven propeller and a turbine driven propeller propulsive engine can be modeled using the same expression. %PDF-1.4 %�� 0000012434 00000 n 0000065574 00000 n 0000006917 00000 n Friction will help transmit torque and provide resistance to axial motion of the hub relative to the shaft. D. Prediction of Pump’s Shaft Diameter . Each propeller blade is a rotating airfoil which produces lift and drag, and because of a (complex helical) trailing vortex system has an induced upwash and an induced downwash. Later on, during ship trials, the calculation shall be validated by measurements on board. trailer << /Size 63 /Info 31 0 R /Root 33 0 R /Prev 117323 /ID[<13a029596818d3aa755d133fef2c0f13><13a029596818d3aa755d133fef2c0f13>] >> startxref 0 %%EOF 33 0 obj << /Type /Catalog /Pages 30 0 R >> endobj 61 0 obj << /S 151 /Filter /FlateDecode /Length 62 0 R >> stream 0000009491 00000 n ��a�r֓� #�[�SK��3��+R��B�ޔW��?�_=B��r�vg�4��.��$�~g]}S,��K#��'^�i��h1��$�p��w>�� j� The estimated shaft … propeller shaft material and the natural frequency of the thermoplastic polyimide with 30% carbon fiber is very closed to conventional material. 0000055623 00000 n 0000004996 00000 n 3. 0000006895 00000 n x�bb�f`b``Ń3� ��ţ�1�1@� �� 0000009725 00000 n H�TP�n�0��[uГ�1��Th�\b�HŉL��&G��lyj�-� ��Nw`�dg��F��h � 0000000967 00000 n calculations for model scale (if the model experiments have been performed without the rudder), but it is always included in the full scale calculations. ShaftDesigner is a CAE shaft calculator software for high-quality marine propulsion fair curve shaft alignment, bearing bush calculations, torsional vibration analysis, axial vibration analysis and whirling vibration analysis at the design, production, maintenance and ship repair stages.. b. Shaft torque c. EHP of the boat d. The propeller shaft power (delivered power) PD e. The (Quasi) PC or ηD The propeller is also tested at zero ship speed (bollard pull) and it is found that the engine limits the torque to 50,000 lbf ft. 0000000934 00000 n 0000002043 00000 n 0000001022 00000 n 7. 0 0000000016 00000 n x�b```b``�f`e``9� Ȁ �@1V�@��L��00L��I��K��/��5�.�d�:��}~S��T�(� �.0�RGG�2� rY#��N��Z - Ĳ`F ��v1�`�à�|�!��J�K@�c:�t��k�I�+�L8�3�g��8�R~��%`3X17c��fZ� ��0�� '�C� Q<>/Size 419/Type/XRef>>stream • Compare combined stresses to suitable allowable stresses, Key word - propeller shaft, composite material, FEM analysis, Design & weight optimization etc. 0000003346 00000 n For all plants shaft alignment specification is to be available for information. Sol. 0000001697 00000 n 1) The 3D model is created in CATIA as per the calculated dimensions of shaft and coupling assembly in design calculation part. <<8C68F53AF7526B4490468090E0066EC1>]>> 0000005346 00000 n 0000009801 00000 n 0000002088 00000 n Therefore, the stock propeller pitch (in case of CPP) is recommended to be adjusted to the anticipated propeller shaft power and design propeller revolutions. The determination of the design velocity ﬁeld Taking into account the scale effect on the velocity ﬁeld at propeller location is a very important aspect of the propeller design process. 0000079223 00000 n 0000002982 00000 n So, the design of the shaft will be based on the maximum bending stress and will be driven by the followi… π. n BHP T = 2. 449 0 obj<>stream The maximum bending stress generated at the outer most fiber of the shaft. Perfect solution for the concept design checking before the final drawings production. The diameter of the propeller, defined as the diameter of the circle traced around the tips of the blades, has a direct impact on power. Design of propeller turbines for pico hydro Robert Simpson & Arthur Williams This design guide is to be used alongside the calculation spreadsheets that can be downloaded from the Pico Hydro website (www.picohydro.org.uk). In this case, the shaft flexibility is reduced, the reaction influence number is increased, and the point load of each bearing is easily influenced by change in displacement. Most shafts will transmit torque through a portion of the shaft. Typically the torque comes into the shaft at one gear and leaves the shaft at another gear. In addition to a shaft alignment specification, also shaft alignment calculations may be … The drive shaft with multiple pulleys experience two kinds of stresses, bending stress and shear stress. Figure 11.24 shows a schematic of a propeller. norm, the calculation of geometry is performed for the input gear pair and it is defined as a hypoid gear pair. 0000001258 00000 n As a result, the length of the propeller shaft is reduced, along with the stern tube bearing span used to support it. For the planetary transmission, a calculation of gear module for bevel The taper will impart a compressive contact pressure between the hub and the shaft. The construction of the relevant load diagram lines is described in detail by means of several examples. VII. 25 ... calculations as such are carried out, as the calculation procedure is extremely complex. 0000007274 00000 n 7.1Theoretical and Ansys results simulation the drive shaft for simplicity has been first idealized as a hollow cylindrical shaft … 0000065343 00000 n b) Power demanded by the propeller, and thrust provided, at zero advance speed. It is intended to be used by turbine design engineers and small manufacturers 419 0 obj <> endobj Propeller shaft; 7. Figure 1 is taken from Gilmer and Johnson, Introduction to Naval Architecture. H�l�Ko�F��. A free body dia-gram of the shaft will allow the torque at any section to be determined. 32 0 obj << /Linearized 1 /O 34 /H [ 1022 301 ] /L 118091 /E 15734 /N 9 /T 117333 >> endobj xref 32 31 0000000016 00000 n 0000010242 00000 n 0000002110 00000 n 0000012456 00000 n As with most factors in prop design, there is a balance to be struck, and the diameter should be optimized based on the expected power delivered to the shaft from the engine and the RPM. 0000065866 00000 n 0000010988 00000 n 0000001711 00000 n }��E_�8�/t��}ũ��y��e�S�q;00��60�50�6�5�d0X �q0��e04��d`<2 HK��1nq%V��:�0�+0F7�z��x�ӓ�8� �^�2��*�\: - �q6� endstream endobj 62 0 obj 195 endobj 34 0 obj << /Type /Page /Parent 30 0 R /Resources 35 0 R /Contents [ 40 0 R 42 0 R 45 0 R 47 0 R 49 0 R 55 0 R 57 0 R 59 0 R ] /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 35 0 obj << /ProcSet [ /PDF /Text ] /Font << /F3 38 0 R /F4 37 0 R /F5 43 0 R /F6 52 0 R >> /ExtGState << /GS1 60 0 R >> /ColorSpace << /Cs5 36 0 R >> >> endobj 36 0 obj [ /CalRGB << /WhitePoint [ 0.9505 1 1.089 ] /Gamma [ 2.22221 2.22221 2.22221 ] /Matrix [ 0.4124 0.2126 0.0193 0.3576 0.71519 0.1192 0.1805 0.0722 0.9505 ] >> ] endobj 37 0 obj << /Type /Font /Subtype /Type1 /Encoding /WinAnsiEncoding /BaseFont /Times-Bold >> endobj 38 0 obj << /Type /Font /Subtype /Type1 /Encoding /WinAnsiEncoding /BaseFont /Times-Roman >> endobj 39 0 obj 1408 endobj 40 0 obj << /Filter /FlateDecode /Length 39 0 R >> stream The shaft diameter at hub section of impeller is . Also, the value of maximum bending stress is much more than the shear stress. 6. %%EOF a) Propeller efficiency versus advance ratio, and advance speed for maximum efficiency. xref Calculation cases and design options The course is primarly focusing on technology, but will cover the Nauticus Machinery which are necessary for correct erection of the shafting onboard. Basic Nomenclature: Hub The hub of a propeller is the solid center disk that mates with the propeller shaft and to which the blades are attached. 7.2 TYPES OF SHAFT The types of shaft are mentioned in introduction. Shaft Design Objectives • Compute forces acting on shafts from gears, pulleys, and sprockets. 0000003902 00000 n If strength considerations turn out to dominate over deflection, then a higher strength material should be tried, allowing the shaft sizes to be reduced until excess deflection becomes an issue. 0000013658 00000 n • Determine torque in shafts from gears, pulleys, sprockets, clutches, and couplings. W shaft. The calculation results depend upon inertial moments of actual masses, stiffness of shafting components, damping in the actual shafting components, as well as the excitation forces and moments exerted by the propulsion engine(s) and the propeller. Design of Propeller Shaft (dp) Since the propeller shaft is subjected to both bending moment due to propeller weight and twisting moment diameter of propeller shaft dp = 25% extra then the designed by pure torsion. Shaft design based on strengthShaft design based on strength ASME design code: Combined shock and fatigue factorsCombined shock and fatigue factors Type of load Stationary shaft Rotating shaft Type of load km kt km kt Gradualy applied load 1 1 1.5 1 Suddenly applied … m/s) trailer 1 Overview of propeller performance. 0000001530 00000 n 0000007943 00000 n 0000001302 00000 n 0000010392 00000 n objective was met by creating a computer program to design a propeller that meets user-defined aircraft performance requirements within the limitations of the motor, material, and manufacturing methods. H��U�n�F}�W�q��f��ѭ0��Hcy��B��f�YKI��v%;q��H��. The problem is then to get the right propeller radius R and the right jet velocity v'. Bearing (Output Shaft) -Floating Type of bearing : Ball bearingBearing number : 6310 (based on Figure 11-23 Machine Design 4 th Edition)Based on the bearing number stated above, a lifetime of 3.77x 10 6 revs. The reader is referred to the 0000001982 00000 n 0000003618 00000 n inch of spacer shaft length. 0000001323 00000 n 16 π τ. T d. s = (5) Where, T. is the torsional moment and it can be estimated by . 0000003614 00000 n Design TAPERED KEYS Designed to be inserted from the end of the shaft after the hub is in position. 0000010809 00000 n Calculation of shafts in marine applications. : a) Using equations (1) we obtained for the propeller efficiency the plot in Fig. Watts) = density (slugs/ft3,kg/m3) = propeller efficiency factor = speed of aircraft (free stream airspeed) (ft/sec. 11. Tapered keys do not require set screws. To properly choose a propeller we must first understand some of the basic nomenclature used to describe propeller geometry. 0000003124 00000 n 0000005534 00000 n 0000008737 00000 n 1 August 15, 2007 1 17. The use of additive manufacturing (3D printing) in making 0000005129 00000 n c) Maximum advance speed, and corresponding values of η. p, F, and . 0000005479 00000 n The shear stress due to the torsion startxref The torque is often relatively constant at steady state operation. 4) Ansys workbench → read input from → … 0000013969 00000 n – Start with an inexpensive, low or medium carbon steel for the first time through the design calculations. The weight is optimizing up to the 82.04% as compared to conventional propeller shaft material. 0000015505 00000 n Determine: f. the propeller rpm and thrust at this condition a. Prop… (2) where: T = thrust (lbs, N) SP = shaft power (equivalent shaft power for turboprop)(ft lb/sec. 0000001444 00000 n dp = 1.25 x 400.135 dp = 500 mm Design of Intermediate Shaft (d) The intermediate shaft is subjected to bending as propeller, shafts, couplings, dampers, gears and engines. Machine Design Objectives After studying this unit, you should be able to describe types of shafts, take decisions to select the materials for shaft, estimate shaft diameters in different segments along length, and design couplings for shafts. 2) This model has to be analyzed in ANSYS Software for the structural analysis. H�b```��"V|��ea�8 ��tM`�\��wM�YΝY)! • Find bending moments from gears, pulleys, or sprockets that are transmitting loads to or from other devices. This will contain foreseen offsets, gap and sag, jacking loads, etc. For example, a machine running at 1800 RPM with 12 inch of spacer shaft length would allow a maximum offset of: 0.6 mils/inch x 12 inches = 7.2 mils at either coupling at the ends of the spacer shaft. Furthermore, the blade area ratio should be preferably decided on basis of propeller cavitation performance check. Fig. The criterion for this load case shall not be perceived as a design requirement versus static fracture or permanent distortion. 0000005457 00000 n 0000008329 00000 n 60 (6) Allowable shear stress of material of shaft, τis 24.5 MPa because the main shaft is made of S30C. endstream endobj 420 0 obj<>/Metadata 18 0 R/PieceInfo<>>>/Pages 17 0 R/PageLayout/OneColumn/StructTreeRoot 20 0 R/Type/Catalog/Lang(EN)/LastModified(D:20070618110112)/PageLabels 15 0 R>> endobj 421 0 obj<>/Font<>/ProcSet[/PDF/Text]/ExtGState<>>>/Type/Page>> endobj 422 0 obj<> endobj 423 0 obj<> endobj 424 0 obj<> endobj 425 0 obj<> endobj 426 0 obj<> endobj 427 0 obj<>stream eration to the propeller’s design point. A propeller design must be done for a given engine, which delivers a given amount of H horsepower at a given rotation speed ω, and for a given velocity V of the vehicle. 0000008351 00000 n 0000010567 00000 n %PDF-1.2 %�� DESIGN CALCULATION Steel and composite materials and weight of the shaft is optimized and stress intensity factor found for both Steel and composite drive shafts. endstream endobj 428 0 obj<> endobj 429 0 obj<>stream 0000002527 00000 n final design propeller are normally not known. 0000003596 00000 n 3) File → Import→ IGES→ Model.igs.

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