RGTU AU-703 MECHANICAL VIBRATION AND NOISE ENGINEERING SYLLABUS I RGPV AU-703 MECHANICAL VIBRATION AND NOISE ENGINEERING NEW SYLLABS I
Posted by Er. AMIT DWIVEDI
R.G.P.V. BHOPAL,M.P.
AUTOMOBILE ENGINEERING 7TH SEMESTER
AU-703 MECHANICAL VIBRATION AND NOISE ENGINEERING
UNIT-I
Fundamental Aspects of Vibrations:Vibration, main causes,advantages &disadvantages; engineering applications of vibration and noise; vector method of representing harmonic motion; characteristics of vibration,harmonic analysis & beats phenomenon, work done by harmonic forces on harmonic motion;periodic,non-harmonic functions- Fourier series analysis; evaluation of coefficients of Fourier series; elements of vibratory system; lumped & distributed parameter systems. Undamped Free Vibrations:Derivation of differential equation of motion:the energy method,the method based on Newton’s second law of motion, and Rayleigh’s method. Solution of differential equation of motion: Natural frequency of vibration. Systems involving angular oscillations: the compound pendulum.

UNIT-II
Damped Free Vibrations:Viscous damping:coefficient of damping;damping ratio;under damped, over damped and critically damped systems; logarithmic decrement; frequency of damped free vibration; Coulomb or dry friction damping; frequency, decay rate and comparison of viscous and Coulomb damping; solid and structural damping; slip or inter facial damping.

UNIT-III
Harmonically excited Vibration:One degree of freedom-forced harmonic vibration;vector representation of forces; excitation due to rotating & reciprocating unbalance; vibration Isolation, force & motion transmissible;absolute  relative motion of mass (Seismic Instruments ).Whirling Motion & Critical Speed :Whirling motion & Critical speed :Definitions and significance.Critical –speed of a vertical , light –flexible shaft with single rotor : with & without damping.Critical speed of a shaft carrying multiple discs (without damping ), Secondary critical speed.

UNIT-IV
Systems With Two Degrees of Freedom:Un-damped free vibration of 2 d.o.f and Principal modes of vibration;torsion vibrations;Forced,Un-damped vibrations with harmonic excitation ;Coordinate coupling; Dynamic vibration absorber; torsion Vibration Absorber; Pendulum type of dynamic vibration.

UNIT-V
Noise Engineering:Subjective response of sound:Frequency & sound dependent human response ; the decibel scale;relationship between, sound pressure level (SPL), sound power level & sound intensity scale; relationship between addition, subtraction and averaging, sound spectra & Octave band analysis; loudness; weighting networks; equivalent sound level, auditory effects of noise;hazardous noise, exposure due to machines & equipments; hearing conservation & damage risk criteria, daily noise doze.Noise: Sources, Isolation and Control: Major sources of noise on road and in industries, noise due to construction equipments and domestic appliances, industrial noise control,strategies- noise control at source (with or without sound enclosures), noise control along the path (with or without partitions & acoustic barriers ); noise control at the receiver, ear defenders, earplugs, semi-insert protectors.

REFERENCE BOOKS:
  1. Ambekar A.G.,Mechanical Vibrations and Noise Engineering; PHI 
  2. Meirovitch Leonard; Element of Vibration Analysis; TMH
  3. Dukikipati RV Srinivas J Text book of Mechanical Vibrations; PHI
  4. Kelly SG and kudari SK; Mechanical Vibrations; Schaum Series;TMH
  5. Thomson , W.T., Theory of Vibration with Applications , C.B.S Pub & distributors .
  6. Singiresu Rao, Mechanical Vibrations ‘ , Pearson Education . 
  7. G.K. Grover,  Mechanical Vibration , Nem chand and Bross , Roorkee .
EXPERIMENT LIST: 
  1. To find out effect of load on natural frequency of vibrations of a lever pin supported at one end carrying adjustable load on a vertical screwed bar and spring supported at some intermediate point (i) When the dead weight of rods is neglected and (ii) when their dead weight is taken into account .
  2. To find out frequency of damped free vibration and rate of decay of vibration-amplitude in the system.
  3. To find out natural frequency and damped free frequency of a torsion pendulum and , hence to find out coefficient of damping of the oil ;
  4. To observe the phenomenon of whirl in a horizontal light shaft and to determine the critical speed of the shaft.
  5. To observe the mode shapes of a spring-connected, double pendulum and hence to demonstrate the phenomenon of beats.
  6. To demonstrate the principle of tuned Undamped Dynamic Vibration Absorber and to determine the effect of mass-ratio (of main and auxiliary mass) on the spread of the resulting natural frequencies ;
  7. To take measurements of sound Pressure Level (SPL) and to carry out octave band analysis of a machine using Noise Level Meter. 
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