welding processes and practices

... Cardiff and Birmingham and lectured at The University of the Witwatersrand In the USA he worked on the development of weldable high-strength and alloy steels with International Nickel and US Steel and ... fabrication; Welding; Bolting; Cutting; Handling and routeing of steel; Quality management 948 33 Erection Introduction; The method statement; Planning; Site practices; Site fabrication and modifications; ... modifications; Steel decking and shear connectors; Quality control; Cranes and craneage; Safety; Special structures 971 34 Fire protection and fire engineering Introduction; Standards and building regulations;...

Ngày tải lên: 23/03/2014, 21:09

... 172, 1958, pp 87-112 Niemann, G and Baethge, J., 'Transmission error, tooth stiffness, and noise of parallel axis gears.' VDI-Z, Vol 2, 1970, No and No Palmer, D and Munro, R.G., 'Measurements ... 2.8 Harris map of interaction of elastic deflections and long tip relief This explanation of the handover process was developed by Harris [3] and the diagrams of the effects of varying load are ... short, or intermediate relief In 1970, Neimann in Germany [4] and Munro in the U.K introduced and developed the ideas of "long" and "short" relief designs for the two extreme load cases where...

Ngày tải lên: 13/12/2013, 03:15

... Understanding Gear Noise, J Derek Smith Chains for Power Transmission and Material Handling: Design and Applications Handbook, American Chain Association Corrosion and Corrosion Protection Handbook, ... Selection and Application, Duane Tandeske 73 Zinc Handbook: Properties, Processing, and Use in Design, Frank Porter 74 Thermal Fatigue of Metals, Andrzej Weronski and Tadeusz Hejwowski 75 Classical and ... Revised and Expanded, Earl Logan, Jr 86 Vibrations of Shells and Plates: Second Edition, Revised and Expanded, Werner Soedel 87 Steam Plant Calculations Manual: Second Edition, Revised and Expanded,...

Ngày tải lên: 13/12/2013, 03:15

... Level Specification Sample Sound Power Level Specification Bandwidth and Geometric Mean Frequency of Standard Octave and 1/3 Octave Bands 2-4 2-5 3-3 3-4 3-6 3-7 3-8 3-9 4-2 4-7 4-8 4-9 4-10 4-11 ... extended to include the 16 and 31.5 Hz octave bands Secondly, the high frequency range at 2,000 and 4,000 Hz is significantly less permissive, and the 8,000 Hz octave band has been omitted since ... area “A” (which is the product of the two lengths “a” and “b”) At twice the distance, 2d, the lengths a and b are expanded to 2a and 2b, and the resulting area over which the sound is now spread...

Ngày tải lên: 28/03/2014, 18:20

... Understanding Gear Noise, J Derek Smith Chains for Power Transmission and Material Handling: Design and Applications Handbook, American Chain Association Corrosion and Corrosion Protection Handbook, ... Selection and Application, Duane Tandeske 73 Zinc Handbook: Properties, Processing, and Use in Design, Frank Porter 74 Thermal Fatigue of Metals, Andrzej Weronski and Tadeusz Hejwowski 75 Classical and ... Revised and Expanded, Earl Logan, Jr 86 Vibrations of Shells and Plates: Second Edition, Revised and Expanded, Werner Soedel 87 Steam Plant Calculations Manual: Second Edition, Revised and Expanded,...

Ngày tải lên: 03/07/2014, 12:20

... 172, 1958, pp 87-112 Niemann, G and Baethge, J., 'Transmission error, tooth stiffness, and noise of parallel axis gears.' VDI-Z, Vol 2, 1970, No and No Palmer, D and Munro, R.G., 'Measurements ... ends of gears since the ability to expand axially reduces the effective Young's modulus and high angle helical gears have reduced contact support at one end and additional buttressing at the other ... helix and alignment accuracies, and gear body deflections, must sum to less than a few fim As a result, we have 15 Harris Mapping for Spur Gears to allow for typically up to 100% overload and deflection...

Ngày tải lên: 03/07/2014, 12:20

... Understanding Gear Noise, J Derek Smith Chains for Power Transmission and Material Handling: Design and Applications Handbook, American Chain Association Corrosion and Corrosion Protection Handbook, ... Selection and Application, Duane Tandeske 73 Zinc Handbook: Properties, Processing, and Use in Design, Frank Porter 74 Thermal Fatigue of Metals, Andrzej Weronski and Tadeusz Hejwowski 75 Classical and ... Revised and Expanded, Earl Logan, Jr 86 Vibrations of Shells and Plates: Second Edition, Revised and Expanded, Werner Soedel 87 Steam Plant Calculations Manual: Second Edition, Revised and Expanded,...

Ngày tải lên: 05/08/2014, 09:20

... Understanding Gear Noise, J Derek Smith Chains for Power Transmission and Material Handling: Design and Applications Handbook, American Chain Association Corrosion and Corrosion Protection Handbook, ... Selection and Application, Duane Tandeske 73 Zinc Handbook: Properties, Processing, and Use in Design, Frank Porter 74 Thermal Fatigue of Metals, Andrzej Weronski and Tadeusz Hejwowski 75 Classical and ... Revised and Expanded, Earl Logan, Jr 86 Vibrations of Shells and Plates: Second Edition, Revised and Expanded, Werner Soedel 87 Steam Plant Calculations Manual: Second Edition, Revised and Expanded,...

Ngày tải lên: 05/08/2014, 09:20

... vibration isolators Of these approaches, (c) and (d) are very expensive and tend to be temperamental and delicate or impracticable so this book concentrates on (a) and (b) as the important approaches, ... displacements and so the answers appear initially in units of seconds of arc It is possible to measure T.E semi-statically by using dividing heads and theodolites on input and output and indexing ... transmission and losses over a broad frequency band can give a clearer description than the conventional transfer function approach when frequencies are high and there are multiple inputs and resonances...

Ngày tải lên: 05/08/2014, 09:20

... vibration isolators Of these approaches, (c) and (d) are very expensive and tend to be temperamental and delicate or impracticable so this book concentrates on (a) and (b) as the important approaches, ... displacements and so the answers appear initially in units of seconds of arc It is possible to measure T.E semi-statically by using dividing heads and theodolites on input and output and indexing ... transmission and losses over a broad frequency band can give a clearer description than the conventional transfer function approach when frequencies are high and there are multiple inputs and resonances...

Ngày tải lên: 05/08/2014, 09:20

... 172, 1958, pp 87-112 Niemann, G and Baethge, J., 'Transmission error, tooth stiffness, and noise of parallel axis gears.' VDI-Z, Vol 2, 1970, No and No Palmer, D and Munro, R.G., 'Measurements ... theory it is small and is dominated by axial force effects and conventional T.E effects Tip relief has a further complicating effect since all loadings near root and tip are reduced and with an older ... short, or intermediate relief In 1970, Neimann in Germany [4] and Munro in the U.K introduced and developed the ideas of "long" and "short" relief designs for the two extreme load cases where...

Ngày tải lên: 05/08/2014, 09:20

... 172, 1958, pp 87-112 Niemann, G and Baethge, J., 'Transmission error, tooth stiffness, and noise of parallel axis gears.' VDI-Z, Vol 2, 1970, No and No Palmer, D and Munro, R.G., 'Measurements ... theory it is small and is dominated by axial force effects and conventional T.E effects Tip relief has a further complicating effect since all loadings near root and tip are reduced and with an older ... short, or intermediate relief In 1970, Neimann in Germany [4] and Munro in the U.K introduced and developed the ideas of "long" and "short" relief designs for the two extreme load cases where...

Ngày tải lên: 05/08/2014, 09:20

... significant vibration generation at once-per-tooth frequency and harmonics This, at first sight, seems peculiar and if, as in Fig 4.5, we plot typical random adjacent pitch errors around a pinion, it is ... commonly called the pitch line and is where the two pitch cylinders touch The pressure plane is limited at either end as the "unwrapping band" unreels from one base cylinder and reels onto the other ... one point in the mesh cycle is as shown in Fig 4.11 and gives the idea of how the misalignment and crowning affects the local interferences and hence the loadings Each column represents one possible...

Ngày tải lên: 05/08/2014, 09:20

... significant vibration generation at once-per-tooth frequency and harmonics This, at first sight, seems peculiar and if, as in Fig 4.5, we plot typical random adjacent pitch errors around a pinion, it is ... commonly called the pitch line and is where the two pitch cylinders touch The pressure plane is limited at either end as the "unwrapping band" unreels from one base cylinder and reels onto the other ... one point in the mesh cycle is as shown in Fig 4.11 and gives the idea of how the misalignment and crowning affects the local interferences and hence the loadings Each column represents one possible...

Ngày tải lên: 05/08/2014, 09:20

... generated in line 33 and is stored for plotting and to be used to calculate accelerations in lines 37 to 40 Accelerations and velocities are multiplied by the time increment and are added to existing ... x and y but this needs 12 co-ordinates instead of 10 As there are 10/12 co-ordinates there are as many equations of motion to be put down and a further two which determine the tooth forces P and ... angles, velocities and angular velocities (which are all "known") and use them to calculate the bearing support forces, the interference between the gears at the gear mesh pitch point, and the relative...

Ngày tải lên: 05/08/2014, 09:20

... amplitudes of the pulses (to about V) and to slow down their rate of change of voltage Standard logic TTL pulses from the sensors rise and fall V in less than 0.5 us and this sudden change gives pickup ... variations possible on this theme and alternatively each encoder pulse train may be demodulated in the computer to extract the torsional vibration Sweeney and Randall [3] and Remond [4] describe different ... give us curve A in Fig 6.6 and the same plot for twice tooth frequency may give curve B and thrice tooth frequency, curve C The curves are similar where they overlap and the differences in amplitude...

Ngày tải lên: 05/08/2014, 09:20

... amplitudes of the pulses (to about V) and to slow down their rate of change of voltage Standard logic TTL pulses from the sensors rise and fall V in less than 0.5 us and this sudden change gives pickup ... variations possible on this theme and alternatively each encoder pulse train may be demodulated in the computer to extract the torsional vibration Sweeney and Randall [3] and Remond [4] describe different ... give us curve A in Fig 6.6 and the same plot for twice tooth frequency may give curve B and thrice tooth frequency, curve C The curves are similar where they overlap and the differences in amplitude...

Ngày tải lên: 05/08/2014, 09:20

... have a flexible coupling at input and output The coupling needs to be robust to stand up to shop floor handling if on production but must be accurate Worms and wheels have the complication that ... distance and the mass and speed limitations of large encoders In practice, for gear noise work, accuracy is not a limitation Choice between shaft mounting and coupling drive is not clear and depends ... designed to handle a very wide range of test gears and to be "foolproof The velocity approach is probably the cheapest option as it does not involve interpolation and only needs a standard data...

Ngày tải lên: 05/08/2014, 09:20

... have a flexible coupling at input and output The coupling needs to be robust to stand up to shop floor handling if on production but must be accurate Worms and wheels have the complication that ... distance and the mass and speed limitations of large encoders In practice, for gear noise work, accuracy is not a limitation Choice between shaft mounting and coupling drive is not clear and depends ... designed to handle a very wide range of test gears and to be "foolproof The velocity approach is probably the cheapest option as it does not involve interpolation and only needs a standard data...

Ngày tải lên: 05/08/2014, 09:20