JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Overview

Course Overview: This course expands on the mechanical engineering student’s background in dynamic synthesis and analysis by providing significant skills and experience in creating and modeling mechanisms. This course is intended to deal with the forces and their effects, while acting upon the machine parts in motion. The knowledge of this subject is very essential for an engineer in designing the various parts of a machine. Study of applications of gyroscopes is very helpful to learn the precession and its effect on automobiles. The study of dynamics of machinery is an applied field of mechanical engineering that is concerned with understanding the relationship between the geometry and the motions of the parts of a machine and the forces that produce this motion. This course helps to learn how to analyze the motions of mechanisms, design mechanisms to have given motions, and analyze forces in machines. Application of vibrations to the analysis and design of machines and mechanical components.

Course Objectives:

• 1. The objectives of the course are to enable the student to have;
• 2. An ability to derive frictional forces on bodies in motion by applying knowledge of mathematics and mechanics.
• 3. An ability to design and conduct experiments on gyroscopes, as well as to analyze and interpret data.
• 4. An ability to design, formulate, and solve engineering problems on clutches and brakes.
• 5. An ability to understand the purpose of dynamometers and find the power of an engine.
• 6. An ability to balance both the rotating and reciprocating masses.
• 7. An ability to study the vibrations of beams and springs when masses are attached
• 8. To enhance the ability of students to work in teams, establish the leadership role.
• 9. The broad education necessary to understand the impact of engineering solutions in a global, economic, environmental, and societal context.
• 10. Recognition of the need for, and an ability to engage in life-long learning.
• 11. An ability to use the techniques, skills, and modern engineering tools necessary for engineering practice

Course Outcomes

After completing this course the student must demonstrate the

knowledge and ability to:

• 1. Analyze Dynamics of the three-dimensional particle motion in various coordinate systems: Cartesian, natural, and cylindrical.
• 2. Ability to learn the concepts of gyroscopic effects and effect of precision motion on the stability of moving vehicles.
• 3. Ability to learn the concepts of static and dynamic force analysis of planar mechanisms.
• 4. Understanding of the concepts of friction-clutches, brakes and dynamometers and its importance.
• 5. Understanding the importance of turning moment diagrams, fly wheels and governors its analysis.
• 6. Ability to understand concepts of various balancing of rotary and reciprocating mass.
• 7. Understanding of the concepts of vibrations and simple problems on forced damped vibrations.
• 8. Able to communicate effectively in both verbal and written form.
• 9. Understanding of impact of engineering solutions on the society and also will be aware of contemporary issues.
• 10. Develop confidence for self education and ability for life-long learning. 11. Can participate and succeed in competitive examinations like GATE, GRE.

UNIT - I

Angular Motion: Gyroscopes – effect of precession – motion on the stability of moving vehicles such as motorcycle – motorcar – aero planes and ships. Static and Dynamic Force Analysis of planar mechanisms.

UNIT - II

Friction: Inclined plane – Friction of screw and nuts - Pivots and collars – uniform pressure, uniform wear – friction circle and friction axis: lubricated surfaces – boundary friction – film lubrication. Clutches, Single plate, multi plate, cone clutch, centrifugal clutches. Brakes and Dynamometers: Simple block brake - Internal expanding brake- band brake of vehicle. Dynamometers – absorption and transmission types. General description and methods of operation.

UNIT - III

Turning Moment Diagram and Flywheels: Turning moment- Inertia torque-connecting rod angular velocity and acceleration-crank effort and torque diagrams-fluctuation of energy – flywheels and their Governors: Watt, Porter and Proell governors- Spring loaded governors – Hartnell and Hartung with auxiliary springs- Sensitiveness, isochronisms and hunting– effort and power of the governors.

UNIT - IV

Balancing: Balancing of rotating masses- Primary, Secondary, and higher balancing of reciprocating masses. Analytical and graphical methods. Unbalanced forces and couples. Examination of “V” and multi cylinder in-line and radial engines for primary and secondary balancing- locomotive balancing – Hammer blow – Swaying couple – variation of tractive effort.

UNIT - V

Vibrations: Free Vibration of mass attached to vertical spring –oscillation of pendulums- Transverse loads – vibrations of beams with concentrated and distributed loads. Dunkerly’s method – Raleigh’s method. Whirling of shafts – critical speed – torsional vibrations – one, two and three rotor systems.

TEXT BOOKS:

• 1. Theory of Machines/ S. S. Rattan/McGraw Hill.
• 2. Theory of Mechanism and Machines /Jagadish Lal/Metropolitan Book Company

REFERENCE BOOKS:

• 1. Theory of Machines/ Shigley/ Mc Graw Hill Publishers
• 2. Theory of Machines/ Thomas Bevan/Pearson