ME2302 DYNAMICS OF MACHINERY UNIT I FORCE ANALYSIS AND FLYWHEELS 12

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1 ME2302 DYNAMICS OF MACHINERY L T P C UNIT I FORCE ANALYSIS AND FLYWHEELS 12 Static force analysis of mechanisms D Alemberts principle - Inertia force and Inertia torque Dynamic force analysis - Dynamic Analysis in Reciprocating Engines Gas Forces - Equivalent masses - Bearing loads - Crank shaft Torque Engine shaking Forces - Turning moment diagrams - Flywheels of engines and punch press UNIT II BALANCING 12 Static and dynamic balancing - Balancing of rotating masses - Balancing a single cylinder Engine Primary and secondary unbalanced forces - Balancing Multi-cylinder Engines Firing order Pivoted cradle balancing machines UNIT III FREE VIBRATION 12 Basic features of vibratory systems - Basic elements and lumping of parameters - Degrees of freedom - Single degree of freedom - Free vibration - Equations of motion - natural frequency - Types of Damping - Damped free vibration Whirling of shafts and critical speed - Torsional systems; Natural frequency of two and three rotor systems. UNIT IV FORCED VIBRATION 12 Response to periodic forcing - Harmonic Forcing Forced vibration caused by unbalance - Support motion Force transmissibility and amplitude transmissibility - Vibration isolation UNIT V MECHANISMS FOR CONTROL 12 Governors - Types - Centrifugal governors - Gravity controlled and spring controlled centrifugal governors Characteristics - Effect of friction - Controlling Force Quality of governors effect of friction. Gyroscopes - Gyroscopic couple - Gyroscopic stabilization - Gyroscopic effects in Automobiles and ships TUTORIAL = 15 L = 45 TOTAL: 60 PERIODS TEXT BOOKS: 1. Ambekar A. G., Mechanism and Machine Theory, Prentice Hall of India, New Delhi, REFERENCES 1. Thomas Bevan, "Theory of Machines", CBS Publishers and Distributors, Ghosh A. and Mallick A.K., "Theory of Mechanisms and Machines", Affiliated East- West Press Pvt. Ltd., New Delhi, Shigley J.E. and Uicker J.J., "Theory of Machines and Mechanisms", McGraw-Hill, Inc., Rao J.S. and Dukkipati R.V., "Mechanism and Machine Theory ", Wiley-Eastern Limited, New Delhi, John Hannah and Stephens R.C., "Mechanics of Machines", Viva low-priced Student Edition, Sadhu Singh Theory of Machines Pearson Education, 2002.

2 STANDARDS: 1. IS : 2000, Vocabulary on Vibration and Shock 2. IS : 1992, Guidelines for vibration isolation for machine foundations 3. IS : Part 7 : 1980, Methods of tests for internal combustion engines: Part 7 Governing tests for constant speed engines and selection of engines for use with electrical generators 4. IS : 1992, Mechanical vibration - Balancing Vocabulary 5. IS : 1992, Balancing machine - Description and evaluation COURSE OBJECTIVE: To understand the method of static force analysis and dynamic force analysis of mechanisms To study the undesirable effects of unbalances in rotors and engines. To understand the concept of vibratory systems and their analysis To understand the principles of governors and gyroscopes.

3 MICRO LESSON PLAN WEEK Hours LECTURE TOPICS READING UNIT III FREE VIBRATION 1 Basic features of vibratory systems 2 Basic elements and lumping of parameters I 3 Degrees of freedom 4 Single degree of freedom 5 Free vibration, Equation of motion 6 Free vibration, Equation of motion 7 Natural of frequency, Types of Damping 8 Damped free vibration, Whirling of shafts and Critical speed II 9 Damped free vibration, Whirling of shafts and Critical speed 10 Torsional systems 11 Natural frequency of two and three rotor systems 12 Natural frequency of two and three rotor systems UNIT IV FORCED VIBRATION 13 Response to periodic forcing 14 Response to periodic forcing III 15 Response to periodic forcing 16 Harmonic forcing 17 Harmonic forcing 18 Forced vibration caused by unbalance -Support motion 19 Forced vibration caused by unbalance -Support motion 20 Forced vibration caused by unbalance -Support motion IV 21 Force transmissibility and amplitude transmissibility 22 Force transmissibility and amplitude transmissibility 23 Vibration isolation 24 Vibration isolation

4 UNIT V - MECHANISMS FOR CONTROL 25 Governors, Types, Centrifugal governors 26 Gravity controlled and spring controlled centrifugal gorvernors V 27 Gravity controlled and spring controlled centrifugal gorvernors 28 Characteristics, Effects of friction 29 Characteristics, Effects of friction 30 Controlling force 31 Quality of governors 32 Effect of friction VI 33 Gyroscopes 34 Gyroscopic couple 35 Gyroscopic stabilization 36 Gyroscopic effects in Automobiles and ships UNIT I - FORCE ANALYSIS AND FLYWHEELS 37 Static force analysis of mechanism 38 D' Alemberts principle VII 39 Inertia force and inertia torque 40 Dynamic force analysis 41 Dynamic analysis in Reciprocating engines 42 Dynamic analysis in Reciprocating engines 43 Gas forces VII 44 Equivalent masses 45 Bearing loads, Crank shaft Torque 46 Engine shaking forces 47 Turning moment diagrams IX 48 Turning moment diagrams 49 Flywheels of engines and punch press

5 UNIT II BALANCING 50 Static and dynamic balancing 51 Static and dynamic balancing 52 Balancing of rotating masses 53 Balancing of rotating masses X 54 Balancing of rotating masses 55 Balancing of single cylinder engine 56 Primary and secondary unbalanced forces 57 Balancing of Multi cylinder engines 58 Balancing of Multi cylinder engines XI 59 Balancing of Multi cylinder engines 60 Firing order 61 Pivoted cradle balancing machines