system engineering methods week 9( papaer 1 1000 words , paper 2 1000 words )

CS672 – System Engineering and Analysis

Discussion 10 - 12/7/2018

Samson kamal Victor

Chapter 10: Q 1

Monte Carle Analysis of Queuing system:

It is a technique with the random variable to analyze the probability of waiting time in queuing system to enhance the quantitative analysis and decision making. When there are limited serving resources then queue should be formed to make the serving process easy. Use by different field by the professionals for finance, project management, energy, manufacturing, engineering, research and development, insurance, oil gas, transportation, and the environment. To analysis the queuing system the information required are arrival process, serving process, queue characteristics, to make the queuing system effective and time consuming then some of simulation process is required. The Monte Carle analysis is best simulation process for queuing system. Below are some situations the required for the queuing system (Beasley, n.d.)

· Before serving completed expected time to wait by the customer in the queue, if the service time take too long

· If customer waiting for longer time than the mentioned waiting time then customer may balk the queue

· If queue exceed the average queue length and the queue is keep on growing then waiting time for the customer become high

· To make more utilization of the serving system. If server become ideal make utilization on analysis of minimum total cost

Chapter 11: Q 1

Elements of Control system for speed in automobile:

There are four elements used in control system in automobile (Blanchard, 2010)

Input Automobiles Speed Speedometer cruise control Speed controlled

1. Controlled characteristic: In the running the vehicle it move fast based on the given iput like accelerator, the basic output of the automobile system the characteristic to be controlled is speed, the speed must be measured

2. Sensory device: the characteristic must is measure by some condition, in automobiles the speed characteristic measured with Speedometer conditional device

3. Control device: Some of the automatic control device in automobile is cruise control / autopilot / accelerator to maintain declared speed or planned speed.

4. Actuating device: identify the speed from the speedometer, It is actually controlling the speed in automobile and reduce the speed to normal speed

Chapter 11: Q 2

In the Thermostatically controlled heating system the main characteristic need to controlled in heat coming out of the system, to identify the temperature of the room the control used in thermostat, there are four elements to of control system are identified and the activity explained below

Input Heating System Heat Thermostat Thermostat control Thermostat operator

1. Controlled characteristic: The thermostatically control device main purpose to maintain the temperature of the room, the basic output of the heating system is Heat. The Heat is the characteristic need to be measured, if it goes less than or higher than the mentioned temperature then it must controlled

2. Sensory device: the identified measurable characteristic of the heating system is heat, so the heat is measured with sensing device thermostat sensor conditional device with conditions like decrease less than the mentioned temperature and increases more than the mentioned temperature

3. Control device: The thermostat device identifies the room temperature with sensors and air. Its try to maintain the planned temperature, like it control the temperature

4. Actuating device: if the temperature is not controlled by the Thermostat then Actual device must be turned off the heating system when is surpass the mentioned temperature

Chapter 11: Q 3

Open loop control system:

Open loop control system is a simple control system that has similar features like input, amplification, and output. The open loop system is a one way system process it does not consider the output of the system, it will not validate the output and not control over the output and no machine learning (AMMC, 2016)

Toaster machine is an example for open loop control system. Once the bread got inserted in the toaster and press start button the system just burn the bread for one minute and ejects it out. In this process the system does not validate the bread burnt is fully completed or not, it just work based on the set time

Clothes dryer machine is another example for open control system. Once we added the clothes in to the machine and fix the load and start it, the dryer just spins with hot air for the mention rotation time and stops. In this system it does not check the cloths are really dried up or not, it does not check the output characteristics.

The inkjet printer is another example for open loop control system. After the print is established by the computer device immediately the printer picks up the document and queue up the documents send to it and start printing. If no paper it just stops printing. There no sensor device the identify the quality of printing content

Closed loop control system:

Closed loop control system is feedback based control system. It analyzes the output of the system and react based on the output and give better result. It contains the four elements of controls system controlled characteristics, sensory device, control device and actuating device (AMMC, 2016)

Thermostat is a good example for closed loop control system. The heating system is to maintain the defined temperature in to the room. The input in the hot air blows in the room, the output of the heating system is heat, sensory device is thermostat which control the heat and the actuating device that surpass the system down.

Another example is cruise control system in the vehicle, the input of the system in acceleration of the system, the output of the system is speed and it is a controllable characteristic, the sensory device is the speedometer which provide the information of the speed, the cruise controller just maintain the speed be accelerating and the actuating system that reduce the speed to normal speed

Water level controller is another example. Once the system pump the water to the water tank, the output of the system is water and it is characteristics to be controlled. The sensor device check for the water level as mentioned if the water touch the sensor then immediately the water level controller just shut down the actuating device called water pumping system (Electrical4u, n.d.)

References:

AMMC, (Feb 1. 2016), “Open-Loop Versus Closed-Loop Control Systems - AMMC.”  https://ammc.com/open-loop-versus-closed-loop-control-systems/

Beasley J E, (n.d.), “Queuing Theory”, http://people.brunel.ac.uk/~mastjjb/jeb/or/queue.html

Blanchard B S, (Feb 6, 2010), “Systems engineering and analysis”, 5th edition, page 323, Prentice Hall International Series in Industrial & Systems Engineering

Electrical4u, (n.d.), “Control System | Closed Loop Open Loop Control System.”, Electrical4u.Com, https://www.electrical4u.com/control-system-closed-loop-open-loop-control-system/