DEGREES OF FREEDOM —–SHEET 4 PRACTICAL EXAMPLES FOR VARIOUS DEGREES OF FREEDOM 1. EXAMPLES SYSTEMS WITH ONE DEGREE OF FREEDOM A single mass spring system A disc and a shaft system A simple pendulum A crank has only one degree of freedom A four bar linkage has only one degree of freedom 2. EXAMPLES SYSTEMS WITH […]
DEGREES OF FREEDOM —–SHEET 3 KINEMATIC CONSTRAINTS The motion of the independent rigid bodies can be controlled with kinematic constraints. A Kinematic constraint between two or more rigid bodies decreases the degrees of freedom for the connected rigid bodies. Main classification of kinematic pairs falls in three categories. However these three categories are further sub divided […]
DEGREES OF FREEDOM—–SHEET 2 DEGREES OF FREEDOM FOR A GENERAL KINEMATIC CHAIN Equation for the degree of freedom F = 3n—3j-3 Where F is the overall number of degrees of freedom for the kinematic chain, n is the number of links (including the fixed link), j is the number of sliding or rotating pairs with […]
DEGREES OF FREEDOM—————SHEET 1 DEFINITION: IT IS THE MINIMUM NUMBER OF INDEPENDENT VARIABLES TO DEFINE A SYSTEM COMPLETELY. OR IT IS NUMBER OF VARIABLES WHICH ARE FREE TO VARY IN A SYSTEM. OR IT IS NUMBER OF INDEPENDENT MOTIONS A BODY CAN HAVE TO DEFINE A SYSTEM COMPLETELY. BASIC DEGREES OF FREEDOM FOR A SYSTEM UNDER […]
MACHINE DESIGN–Flywheel design, Design of Rim , Design of Arms DESIGN OF RIM STRESSES IN RIM Tensile stress due to centrifugal force σt = ρv2 Tensile stresses due to bending due to restrain of arms σb = M/Z M = wL2/12 w = UDL =Centrifugal force between two arms per unit length w = mRω2 […]
MACHINE DESIGN——Design of Flywheel, Coefficient of fluctuation of speed, Coefficient of fluctuation of energy, Stresses in rim and arms FLYWHEEL Flywheel is an energy storage device where more power is available in the working stroke. It supplies back this energy to the machine in the remaining strokes of the cycle and maintains a constant speed […]
MACHINE DESIGN: INTERVIEW SHORT QUESTION ANSWERS ON MACHINE DESIGN–Classifications of machine design, qualities of good designer, advantages and disadvantages of cotter joints How do you classify machine design? A. (i) Copied design (ii) Improved design (iii)Innovative design Q.List the qualities of a good designer. A. The traits of a good designer are (i) Good communication skill […]
MACHINE DESIGN: INTERVIEW SHORT QUESTION ANSWERS ON MACHINE DESIGN–Difference between design synthesis and design analysis, Adaptive Design, disadvantages of cast iron from design considerations, methods to increase the fatigue strength of bolted joints A. Definition of design It is a process to create an object/machine to perform the required function satisfactorily over a reasonable period of time […]
MACHINE DESIGN: Multiple Choice Question(MCQ) Answers — Machine Design —Levers— Class 1 levers have Effort between the load and the fulcrum Fulcrum placed between the effort and load Load in-between the effort and the fulcrum None Ans: (ii) Class 2 levers have Effort between the load and the fulcrum Fulcrum placed between the effort and […]
INTERVIEW SHORT QUESTION ANSWERS–MACHINE DESIGN– Definition of leverage, flexible couplings and their practical applications Q. What is meant by leverage? A. It is a ratio of effort arm to load arm. It is much greater than 1. It is the mechanical advantage. It represents that load is how many times the force applied. Q. What is […]