noise vibration and harshness nvh troubleshooting

... 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, ... 4.98 0.498 Note, from Eqs (23.2a) and (23.2b), that fN depends on 6, and thus on both M and K (or W and K) As long as both load and stiffness change proportionately, fN does not change The peak-to-peak ... 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

... identified for noise control purposes, narrow-band analyzers must be used They are available with various bandwidths 24.11 CORRECTION FOR BACKGROUND NOISE The effect of ambient or background noise should ... 10 log S1 24.16 MACHINERY NOISE CONTROL There are five basic methods used to reduce noise: sound absorption, sound isolation, vibration isolation, vibration damping, and mufflers In most cases ... enclosure, and it is highly reverberant, like smooth sheet steel, sound reflects back and forth many times As the noise source continues to radiate noise, with none of it being absorbed, the noise...

Ngày tải lên: 25/10/2013, 13:15

... introductions to nonlinear vibration can be found in Virgin (2000), in Worden and Tomlinson (2001), and in the standards by Nayfeh and Mook (1978) and Nayfeh and Balachandra (1995) REFERENCES Benaroya, ... the standards by Thomson and Dahleh (1993), Rao (2004), and Meirovitch (1986) A complete summary of most vibration- related topics can be found in Braun, Ewins, and Rao (2002) and in Harris and ... introductory review of vibrations and to expand the discipline of vibration analysis and design by intertwining elementary vibration topics with the disciplines of design, control, stability, and testing...

Ngày tải lên: 08/04/2014, 11:49

... France Noise is ubiquitous in nature and in man-made systems For example, noise in oscillators perturbs high technology devices such as time standards or digital communication systems The understanding ... frequency noise and 1/f noise From a careful analysis of the experimental noise attached to the carrier the usefulness of the number theoretical based method is demonstrated This view is expanded ... Mathemagics (A Tribute to L Euler and R Feynman) Pierre Cartier Part I Classical and Quantum Noise Thermal and Quantum Noise in Active Systems Jean-Michel...

Ngày tải lên: 24/04/2014, 16:50

... noise reduction in hearing aids,” IEEE Transactions on Signal Processing, vol 53, no 3, pp 911–925, 2005 8 [10] A K N´ bˇ lek and D Mason, “Effect of noise and reverberaa e tion on binaural and ... postfilters for noise and acoustic echo reduction,” in Microphone Arrays, M S Brandstein and D B Ward, Eds., chapter 12, pp 255–279, Springer, Berlin, Germany, 2001 [16] T Wittkop and V Hohmann, ... “Elimination of the musical noise phenomenon e with the Ephraim and Malah noise suppressor,” IEEE Transactions on Speech and Audio Processing, vol 2, no 2, pp 345–349, 1994 R Martin, Noise power spectral...

Ngày tải lên: 21/06/2014, 22:20

... received additive noise and interference in time, nP (k) is the interference part, nG (k) is the additive Gaussian noise part, and k stands for the snapshot index Due to natural and manmade sources ... of snapshots, and (·)T stands for the transpose operation We make the following assumptions: the signal waveforms are stationary; both temporally and spatially, and the signals and noise are statistically ... additive noise comprised of the additive noise and interferences as follows: n(k) = nP (k) + nG (k), (4) i=1 where G denotes the Gaussian probability density function and α2 , α2 , and βi2 are...

Ngày tải lên: 22/06/2014, 23:20

... harmonic and noise energies By estimating the signal energies in the identified harmonic and noise regions (Section 2.2.1), one can get only an approximate harmonics-to -noise ratio The energy in a noise ... MATERIALS AND METHODS 2.1 Database In the present study, we wanted to understand if HNR and critical-band energy spectrum could be used as effective tools for the classification of normal and pathologic ... the estimated harmonic and noise components for the vowel segment /a/ corresponding to (a) a normal subject and (b) a pathologic subject are shown The harmonic and the noise components are obtained...

Ngày tải lên: 22/06/2014, 23:20

... traffic noise The growth and spread of traffic in space and time and the development of leisure activities and tourism have partly offset the technological improvements Road and air traffic growth and ... 2006) 12 Figure 1.3 Summary of noise annoyance survey in the Netherland (Sandberg, 2001b) Figure 1.4 Contribution of power unit noise and tire/road noise to the total noise emitted by a vehicle as ... 13 Figure 2.1 Radial and tangential vibration noise generation mechanism 59 Figure 2.2 Sidewall vibration noise generation mechanism 59 Figure 2.3 Stick-slip noise generation mechanism...

Ngày tải lên: 08/09/2015, 19:59

... Mitra and Bharati Sengupta, and my mother Mina Roy Chowdhury for being so awesome, caring and supporting My special thanks also go to three of my very close childhood friends Sandip Saha, Sandip ... 101 Figure 4.16: Effect of θ and twist direction on cr and Mcr Filled symbols denote cr and Mcr values under clockwise torsion and open symbols denote cr and Mcr values under anticlockwise ... to calculate the vibration frequencies and mode shapes of SWCNTs from MD simulation trajectories Comparing the vibration frequencies of various chiral SWCNTs, we find that the vibration frequencies...

Ngày tải lên: 09/09/2015, 11:19

... sinusoidal continuous noise, white noise and stochastic pulse-shaped noise [11-12] The sinusoidal continuous noises include radio broadcasting, power frequency, harmonic, and so on These interferences ... employed to denoise PD signals A global threshold that based on standard deviation is used to remove noise components in all frequency bands However, noise components at various frequency bands can ... SF6 1.2 REVIEW OF NOISE REDUCTION AND DISCRIMINATION In this section, previous works on reduction of white noise and discrimination of corona are reviewed 1.2.1 Removal of White Noise Firstly, methods...

Ngày tải lên: 16/09/2015, 08:30

... exist in the translation table Use the show and debug commands to verify that the translation is occurring Review in detail what is happening to the packet and verify that routers have the correct ... NAT statistics with the show ip nat statistics command Because debug commands should always be used as a last resort, start with the show command The intention here is to monitor the hits counter ... performs NAT on the packet and forwards a packet with a source of 172.16.11.70 and a destination of 172.16.11.7 Router sends a response with a source of 172.16.11.7 and a destination of 172.16.11.70...

Ngày tải lên: 21/01/2016, 23:33

... 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 ... effectiveness of 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 ... Causes of Noise 1.1 Possible causes of gear noise To generate noise from gears the primary cause must be a force variation which generates a vibration (in the components),...

Ngày tải lên: 05/08/2014, 09:20