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Note for Kinematics of Machinery - KM By Dhanen Thiran

• Kinematics of Machinery - KM
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Dhanenthiran M
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SRMTRPEC DEPARTMENT OF MECHANICAL ENGINEERING SRM TRP ENGINEERING COLLEGE (SRM GROUP) (An ISO 9001:2018 Certified Institution) Irungalur, Trichy-621105 DEPARTMENT OF MECHANICAL ENGINEERING Unit 1- BASICS OF MECHANISMS 1 Define sliding pair or sliding connectors and what type of kinematic pair exists between human shoulder and arm.  Sliding connectors are used when one slider is to drive another slider. Usually the two sliders operate in the same plane but in different directions.  Spherical pair is exists between human shoulder and arm. 2 Compare machine and structure. S.No 1 2 3 4 3 Machine Structure Relative motion exists between its No relative motion exists between its parts. members. It transforms available energy into It does not convert the available energy into useful work work Links are meant to transmit motion Members are meant for carrying loads and force. having action. Examples: Scooter, Car, Bus. Examples: Roof trusses, bridges. Define kutzbach criteria for a mechanism.  Kutzbach’s criterion for determining the number of degrees of freedom or movability (n) of a plane mechanism is n=3(l-1)-2j-h  n-Degree of freedom, l-Number of links, h-Higher pair joint, j-Lower pair joint. 4 Write short note on complete and incomplete constraints in lower and higher pairs.  A pair having surface contact or area contact between the two elements while in motion is called as lower pair. The relative motion in lower pair is only turning or sliding.  When the two elements of the pair have a line or point contact when relative motion takes place and the motion between the two elements is partly turning and partly sliding, then the pair is known as higher pair. 5 State types of kinematic pairs and the types of constrained motion. Types of kinematic pairs  When two links are in contact with each other it is known as a pair. If the pair makes constrain motion it is known as kinematic pair.  Based on the nature of relative motion between the links. Sliding pair, Turning pair, Cylindrical pair, Rolling pair, Spherical pair, Screw pair.  Based on nature of contact between the links Lower pair, Higher Pair TWO MARKS ME8492-KINEMATICS OF MACHINARY