Industrial robot is extensively used in all major manufacturing and assembly line throughout the world. In order to properly actuate the robot links, it is necessary to calculate the torque required at link joints. In this paper we consider a two degrees of freedom robot manipulator having two rotary joints J1 and J2. This is a classic example of inverse dynamics problem, inverse dynamics in robotics used to calculate torque or force required at joints from known values of link mass, velocity, and acceleration and we choose lagrangian formulation to solve equation of motion. In addition, Robo analyzer software we plot the torque values for predefined value of centre of gravity and link mass.
Elevator is a transport device that is used to move people or goods in vertical direction. In this paper programmable logic based elevator control system is constructed to simulate as an actual lift in real life. Here, a new method for traction based elevator system is introduced which doesn’t need a counterweight. By this method friction along the traction sheave of the elevator can be improved. To reduce friction along the rails bearings are used in the hoisting mechanism. Servo motor (Mitsubishi’s HJ-KS43J) is used as the prime mover for its accurate positioning capability. SIEMENS S7 200 SMART PLC was used for controlling the entire system. PLC is interfaced with hooters, floor switches, indicators and sensors for effective functioning of the elevator system.
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