vibration noise and shock

... frequencies are present as in complex or in broad-band random vibration It is also possible for several modes to simultaneously be excited by a shock pulse (and then to die out) Certain modes are most ... 23.21 Hand-held velocity pickup used for locating points of minimum and maximum motion Fig 23.22 A specialized vibration meter If you knew the velocity and the frequency of sinusoidal vibration, ... high stresses, large forces, and large motions result All remarks about free vibration, fN, and damping apply to continuous systems We can "pluck" the beam of Fig 23.6 and cause it to respond in...

Ngày tải lên: 25/10/2013, 13:15

... 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 of transmission error, vibration ... however, noise is the critical factor, "design load" may refer to the condition where noise has to be a minimum and may be only 10% of the permitted maximum load If the requirement is for minimum noise ... 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, ... 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, ... Couplings and Joints: Design, Selection, and Application, Second Edition, Revised and Expanded, Jon R Mancuso 122 Thermodynamics: Processes and Applications, Earl Logan, Jr 123 Gear Noise and Vibration, ...

Ngày tải lên: 13/12/2013, 03:15

... Measurement of Noise and Vibration in Buildings Measurement of Noise and Vibration Outdoors ... against the noise of all the noisiest possible equipment; such overdesign would require thicker and heavier walls and floors than required by most of the equipment The noise estimates and the noise ... indoor noise and vibration criteria for acceptable living and working environments These criteria can be used to evaluate the suitability of existing indoor spaces and spaces under design 2-2 Noise...

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, ... 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, ... Couplings and Joints: Design, Selection, and Application, Second Edition, Revised and Expanded, Jon R Mancuso 122 Thermodynamics: Processes and Applications, Earl Logan, Jr 123 Gear Noise and Vibration, ...

Ngày tải lên: 03/07/2014, 12:20

... 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 of transmission error, vibration ... however, noise is the critical factor, "design load" may refer to the condition where noise has to be a minimum and may be only 10% of the permitted maximum load If the requirement is for minimum noise ... A.J.D., Jeffries, J.A and Smith, J.D., 'Drive Trains in Printing Machines', Inst Mech Eng Conference, Vibrations in Rotating Machinery, Cambridge, 1980, pp.239-245 Palmer, D and Munro, R.G., 'Measurements...

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, ... 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, ... Couplings and Joints: Design, Selection, and Application, Second Edition, Revised and Expanded, Jon R Mancuso 122 Thermodynamics: Processes and Applications, Earl Logan, Jr 123 Gear Noise and Vibration, ...

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, ... 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, ... Couplings and Joints: Design, Selection, and Application, Second Edition, Revised and Expanded, Jon R Mancuso 122 Thermodynamics: Processes and Applications, Earl Logan, Jr 123 Gear Noise and Vibration, ...

Ngày tải lên: 05/08/2014, 09:20

... GEARCASE FOOT VIBRATIONS ^ Antivibration Mounts I TRANSMITTED STRUCTURE VIBRATION Sound Radiating Panel AIRBORNE NOISE Fig 1.4 Vibration excitation and transmission path 1.6 T.E - noise relationship ... about "noise" when they mean the background random vibrations or voltages which are not the signal of interest Thus we can sometimes encounter something being described as the signal-to -noise ... 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,...

Ngày tải lên: 05/08/2014, 09:20

... GEARCASE FOOT VIBRATIONS ^ Antivibration Mounts I TRANSMITTED STRUCTURE VIBRATION Sound Radiating Panel AIRBORNE NOISE Fig 1.4 Vibration excitation and transmission path 1.6 T.E - noise relationship ... about "noise" when they mean the background random vibrations or voltages which are not the signal of interest Thus we can sometimes encounter something being described as the signal-to -noise ... 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,...

Ngày tải lên: 05/08/2014, 09:20

... 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 of transmission error, vibration ... force and a roughly square waveform and much of spur gear noise was attributed to this effect In addition there were assumed to be "sudden" shocks associated with gear teeth coming into contact and ... 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...

Ngày tải lên: 05/08/2014, 09:20

... 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 of transmission error, vibration ... force and a roughly square waveform and much of spur gear noise was attributed to this effect In addition there were assumed to be "sudden" shocks associated with gear teeth coming into contact and ... 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...

Ngày tải lên: 05/08/2014, 09:20

... they cannot give 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 ... are slender and allow high lateral deflections (>0.2 mm) the natural frequencies of vibration of the gears will be very low so that, although the misalignment will cause T.E and hence vibration, ... take into account shear effects and pinion bending and can allow for variable loading along the contact line 4.7 Design options for low noise When designing standard spur gears for low T.E there...

Ngày tải lên: 05/08/2014, 09:20

... they cannot give 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 ... are slender and allow high lateral deflections (>0.2 mm) the natural frequencies of vibration of the gears will be very low so that, although the misalignment will cause T.E and hence vibration, ... take into account shear effects and pinion bending and can allow for variable loading along the contact line 4.7 Design options for low noise When designing standard spur gears for low T.E there...

Ngày tải lên: 05/08/2014, 09:20

... housing vibration Housing vibration is a very simple, robust measurement using standard cheap accelerometers and it gives a good idea of the levels at the interface between the gearbox internals and ... us the original vibration generation information and the accelerometers give the casing and system response information 6.2 Practical measurements As far as noise measurements and deductions are ... 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...

Ngày tải lên: 05/08/2014, 09:20

... combined internal and external resonances by measuring the bearing vibrations and the noise simultaneously This gives T.E to bearing vibration as well as bearing vibration to noise Whether the ... the vibration power going into the support via that route, again taking note of phase angles As in Fig 6.8, if the velocities of vibration above and below the isolator are Vl and V2 (complex) and ... concerned with the vibration and noise measurements normally made on a gearbox under operating conditions However when problems arise we must return to the source of the vibration and measure T.E...

Ngày tải lên: 05/08/2014, 09:20

... combined internal and external resonances by measuring the bearing vibrations and the noise simultaneously This gives T.E to bearing vibration as well as bearing vibration to noise Whether the ... the vibration power going into the support via that route, again taking note of phase angles As in Fig 6.8, if the velocities of vibration above and below the isolator are Vl and V2 (complex) and ... concerned with the vibration and noise measurements normally made on a gearbox under operating conditions However when problems arise we must return to the source of the vibration and measure T.E...

Ngày tải lên: 05/08/2014, 09:20

... 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 ... Gear Noise and Vibration, I Mech E., April 1990, p Heidenhain Ltd., 200 London Rd., Burgess Hill, Sussex, RH15 9RD, U.K or 115 Commerce Drive, Schaumburg, IL 60173, U.S.A Sweeney, P.J and Randall, ... disadvantages are that the shaft must run true or lateral vibrations will be high and the shaft must be strong enough to take the weight and vibration of the encoder body This is not usually true...

Ngày tải lên: 05/08/2014, 09:20

... 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 ... Gear Noise and Vibration, I Mech E., April 1990, p Heidenhain Ltd., 200 London Rd., Burgess Hill, Sussex, RH15 9RD, U.K or 115 Commerce Drive, Schaumburg, IL 60173, U.S.A Sweeney, P.J and Randall, ... disadvantages are that the shaft must run true or lateral vibrations will be high and the shaft must be strong enough to take the weight and vibration of the encoder body This is not usually true...

Ngày tải lên: 05/08/2014, 09:20