Week -2
REPORT CHALLENGE 2
Doorbell Model
Description: To construct a simulink model using solenoid, battery, switch. the current supply is sent through the circuit by the battery source when the switch is close. the current is supplied continuously when the switch is closed. this mean the bell rings continuously when the switch is closed.
Mechanism: when the switch is closed the current supply from the battery passes through the circuit and enters into the solenoid. the solenoid work under the principle of electromagnetism. the current passes through the spring . due to this electormagnetism induces in coils. the force moves the plunger aside. the plunger hits the metal and the metal produces sound with damping
Creation of model
Frist, we add the switch for the system from the library (electricals). the switch is open for 2 sec this is done by pulse genrator block with phase delay of 2 second .give amplitude 1 and phase width as 50% and frequency 4. we have to connect simulink model to physical system with the help of simulink to ps converter join one end with pulse generator and other by switch. scope block is added to knowing the pules given to the switch.current is supply with the help of battery block and connect with the switch. solenoid block is connected with one end to battery and other with the switch. the current is allow to flow throug the solenoid spring due to this electromagnetism developed in coil make a plunger in motion. the motion of plunger is translation so ideal translation sensor block is added to sense the motion. the 'R'point of both sensor & solenoid are connected, C point is connected with mechanical reference block and then to the solenoid point 'C'. P point gives us output for knowing the position of plunger. and run time of simulation is 10 sec.
Thermistor model
we give the 5 temp input at every 10 sec i.e.for 50 sec we give the temp is kelvin. temperature are 293, 300, 300, 296, 296 for every 10 sec this input is given to the repeating sequence stair block with that scope is connected to get the input plot. we need to cntrol the temperature so connect the controlled temperature source to repeating sequence stair with the help of simulink to ps converter with point 'S' add thermal referance block and connect with point 'A' now connect the thermistor block point 'A' with point 'B' of the source block prviding the current source with the help of battery block and connecting the voltage sensor, rsistor block to the thermistor make the close circuit of all the blocks
we need to operate ON and Off condition for that we add a switch and give the input 0 (off) and 1 (on) with to constant block. connect switch with voltage sensor at point 'V' with the help of conerter block. to get the threshold value connect the display block with switch and scope is used to get the output also connect the solver confriguration and run the simulation under 50 sec the threshold vlaue given by the display block past it into switch now run the model once again for 50 sec to get the output in the scope