Open and closed loop control system Essay Example for Free

Open and closed loop control system Essay In this assignment I shall be looking at the differences between open loop control systems, closes loop control systems and also looking at and identifying the input, output and feedback gained. Open Loop Control System The open loop control system is the cheapest form of control system you can have, this is due to its simplicity. The open loop control system has absolutely no artificial intelligence or any form of sensor what so ever. This then means there is nothing controlling the inputs going in to the system, this then means that accuracy may be deficient and the system will not be working to its true efficiency. An example of this kind of system would be that for a microwave. When we turn a microwave on we select the power we want and the time limit we want and away it goes. The thing is, when it is powering itself up, how does it no if its hitting the true temperature we wanted successfully? The answer to this is that is doesnt. Open-loop control is useful for well-defined systems where the relationship between input and the resultant state can be modeled by a mathematical formula. For example determining the voltage to be fed to an electric motor that drives a constant load, in order to achieve a desired speed would be a good application of open-loop control. If the load were not predictable, on the other hand, the motors speed might vary as a function of the load as well as of the voltage, and an open-loop controller would therefore not be sufficient to ensure repeatable control of the velocity. Closed Loop Control System The closed loop control system is rather more expensive to implement than that of its counterpart. This is down to the complexity of the functions that it can complete. The closed loop does have some form of monitoring capabilities and can in fact use sensors ad artificial intelligence well. An example of a closed loop control system would be that of the sprinkler system, where the user sets the desired time for the sprinkler to come on, but instead of juts doing this when set it could read the grass moisture in the first place and then make a split decision in whether it needed to be implemented or not. Control Loop Operations Normally an open loop control system comprises of the following three things, 1. Sensor This is used to measure a value before being passed in to the process 2. Decision Decisions usually follow information from the sensor being collected and analysed. This allows the system to remain up to date and make any appropriate changes accordingly 3. Action This is the action of the computer or comparator altering settings There are two differing types of systems that can be used for control and they are Analogue or digital. The two shall be explained in greater detail below. Digital and Analogue Control Systems. The digital control system is used in the form of a micro controller to control a computer system. A digital controller is usually cascaded with the plant in a feedback system. The rest of the system can either be digital or analog. Some examples of analog systems with a digital feedback controller are:   Aircraft   HVAC   Electric motors   PID controllers   Radar   Robotics   Typically, a digital controller requires: For mixed control types such as digital and analogue systems we need a process of conversion, for example digital to analogue converters (these are called DACS). The opposite can take place, by using an analogue to digital conversion process called ADC. All of these analogue control systems are embedded with micro controllers. These micro controllers have the power to run the systems and comprise of fairly common hardware properties. The typical hardware properties that can be found in the control systems micro controller can be seen below;   CPU This is the central processing unit EPROM Non volatile memory source that doesnt loose its data when the power is switched off   RAM This is the random access memory. I/O These are the input output devises A micro processor will control the control system and process the information in order for it to function correctly. For example, if we have a sprinkler system in the garden as previously described, the inputs and outputs would need to be managed by the micro controller. If the ground was wet, it could check its EPROM (erasable program read only memory) to see what the water density was, and then the process could make a decision and process it appropriately. Below is a list of the inputs that could be put in to this system.   Time for eater to be sprinkled   Required water density in the ground Temperature of the ground   Duration timer Transducers (analogue systems) Usually the forms of input found in the analogue systems are called transducers. There is a specific purpose to doing this and its main reason is down to conversion. If for example we have an electrical input and we want to display it as a picture on the page we must use a television. The transducer in this will be the Cathode ray tube (CRT) which is electromagnetic. When using sensors or transducers the signal must be converted in to an electrical measurement (volts). Below is a list of the possible input devises we can have within a system or a circuit.   Geophone Converts earth tremors in to electrical voltage   Geiger-Muller tube used for measuring radioactivity   Cathode ray tube (CRT) converts electrical signals into visual form When the electrical charge is received it then needs to be converted in to the correct signal type using one of the transducers above, however for these signals to be used correctly we need to obtain the appropriate components. Lamp The input for a lamp is electricity and this is then output as a light source after being converted. This type of power source is used for many things Speaker Gathers electricity from the data source and then is output as a volume so people can hear it. This also has a large application/usage basis   Heat The input again is electricity, this is then converted and output as heat. This is normally found on things like electric fires and car cigarette lighters Motor This is input of electricity and then is output as movement energy. This type of system is used within moving doors.

Euthanasia: The Right Choice for America Essay -- Argumentative Persua

Euthanasia: The Right Choice for America The ethical debate of euthanasia continues while Oregon remains the only state in which it is legalized in. Based on the success of the Oregon euthanasia law, this law should serve as a model to the rest of the nation and it should be implemented all across the U.S. The success and effectiveness of this law can be seen through many case studies and statistics. Of course, there is a line that is often crossed with doctors who euthanize under unlawful conditions; however, under the right circumstances euthanasia can work. Should the United States of America continue to overlook a patent’s wishes and desires and instead primarily focus on doing everything possible to keep a person alive when there is no need? Where is the rationality in letting a person who is suffering die a slow painful death? Granted physicians are obliged to preserve life at all costs, under many circumstances, there is no need for this effort. If a patient requests death, his wish should be respected and approved. Why must the right to die be taken away? If there is no justifiable reason to preserve someone’s life, there should be no need to do it. One example reflects the experiences of a man named David Miller’s grandmother. He shares a story of her after she was diagnosed with emphysema. The disease contributed to her inability to use her neck muscles, to breath, and to speak. Many question such a doctors’ judgment in keeping such a person, who’s both suffering and serving no purpose to the world, alive. (Miller, 27) Sometimes, doctors need to focus on the quality of life of a patient, especially if the patient is suffering. Terms such as passive euthanasia and active euthanasia are often tos... ...ide Largely Shunned.† The Christian Century Dec 2000: 1267 Buckley, William F. â€Å"Killer Doc.† National Review Dec 1998: 70 Kavanaugh, John F. â€Å"Euthanizing Life† America May 2001: 28 MacQueen, Ken. â€Å"Choosing Suicide† Maclean’s v. 115 no31 (August 5 2002) p. 40-1 Miller, David. â€Å"From Life in Death in a Peaceful Instant.† The Humanist (May/ June 2000) 27 Nichols, Mark. â€Å"Offering a Helping Hand to Those Who Long to Die.† Maclean’s March 1998: 52 Rayner, Clair. â€Å"You Say Murder, I Say Euthanasia.† New Statesman June 2000: 31 Richardson, Andrea E. â€Å"Death with Dignity: The Ultimate Human Right?† The Humanist (July/ Aug 2002) p. 42-43 Sarasohn, David. â€Å"No Last Rights† The Nation v.273 no19 (December 10 2001) p. 8 Welie, Jos V. M. â€Å"Why Physicians? Reflections on the Netherlands’ New Euthanasia Law.† The Hastings Center Report Jan/Feb 2002: 42-44

Case study: Airborne Express Essay

Discussion Questions:1. Using the Value Chain Analysis, identify the primary & support activities of AirborneExpress. First I’m going to tell something about the primary activities of Airborne Express. The primary activities exist of inbound logistics, operations, outbound logistics, marketing and sales, and as last after-sales service. Inbound logistics: They use road and air. After the pick up, it goes to the major hub in Wilmington. Operations: The operations are the delivery of approximately 900000 packages. Outbound logistics: The delivery of the packages from the hub to the delivery destination. Marketing and sales: Targeting logistics managers of major shippers. After-sales service: The use of their internet site to track their shipment and the call center automation. Second, The support Activities, they include human resources, accounting and finance operations, technology, and procurement. Human resources: â€Å" strait-laced, frugal and conservativeâ€Å"Firm infrastructure: Their fleet has 13 300 vans, 175 aircrafts and their own airport. Technology: Airborne uses its Freight on-line control and Update System (FOCUS) but in general they wait with investments until shows clear benefit for the customer. Procurement: The usage of their aircraft fleet2. What are Airborne Express’ most important capabilities? What is its core competence?Airborne Express targeted the business that focused on the shipping of large volume of urgent items, primarily to other business locations. Their most important  capabilities are that, Airborne Express is the only one who has an airport and therefore didn’t have to pay for landing fees, nor did it face any obstacles to tailoring the facility to its needs. Airborne has build a warehouse space who created the ability to receive orders as late as 2 am and have goods delivered the same day. Airborne has a patent on his cargo containers who fitted through a passenger door of an air craft and therefore did not needed a cargo door. Airborne could fill his aircraft roughly 80% full and not 65%-70% as his competitors. An other advantage of Airborne is that they could use the trucks more often than their competitors for the long-haul portion of a delivery and this was estimated to have costs who were 1/3 of the costs of owning and operating a similar amount of aircraft capacity. Airborne did things to offer a low price and was known for that. Airborne created a code for one of his biggest clients Xerox so that those packages would be delivered first (8 am.)Airborne core competence is to offer a good and fast service at a low price and they can do that because they are able to cut in their costs. 3. How and why has the express mail industry structure evolved in recent years? How have the changes affected small competitors?Evolutions:-Other kind of deliveries and more focus on speed and price. -Higher volumes and decreases of price-A larger public uses this industry-The calculations of the optimal route with information systems for speed and low price-Track shipment-The customers became more difficult and started to ask more from the companies and wanted to have as much information as possible at all time. Small competitors have a rough time because they have to compete with the larger and better organist companies. Big companies have advantages like economies of scale, bargain power,†¦. The big companies don’t use all their full capacity all the time and they come the small companies in. They can buy capacity from the big ones. So the big companies can reduce their costs and the small companies can play in the express mail industry game. 4. How has Airborne survived, and recently prospered, in its industry? What  must Robert Brazier, Airborne’s President and COO, do in order to strengthen the company’s position?Airborne is the third largest player in the express mail industry and even with recent strikes at rival UPS, he isn’t able to gain more market share from FedEx and UPS. To strengthen the company’s position, Airborne has to:-Airborne has an advantage with the usage of his trucks because the most of his volume are in the afternoon or second day deliveries. Airborne has to enlarge and develop his ground transport and the services that he there offers. -Has to find a partner or an other airline to share the facility expenses of the airport. -Airborne has to create strong and long term alliances (Roadway Package was a good start) to compete with FedEx and UPS-Upgrade and invest in his services (customers, transport, delivery on time,†¦) as much as possible-Keep on focusing on the large accounts of corporation (like Xerox)Bibliography: – Strategic Management: Concepts, Second Edition (2008), by Mason A. Carpenter and Wm. Gerard Sanders, Pearson Prentice Hall. ISBN-10: 0132341409; ISBN-13: 9780132341400- Harvard online, buy case study Airborn Express

Why Did Germany Invade The Soviet Union - 974 Words

Why did Germany invade the Soviet Union? Throughout World War II, Hitler had conquered the majority of Western Europe. After Germany was defeated by Great Britain and stopped from conquering the entire country, Hitler placed his attention toward the Soviet Union. Therefore, on June 22nd, 1941 Hitler launched Operation Barbarossa with the intention of conquering the Soviet Union. The intention for invasion toward the Soviet Union was to conquer and gain control over the large country and its natural resources which could serve as a perfect place to commence the creation of an empire. Not only was gaining control over territory nor resources a factor for invasion, but his life experience may have influenced him to take this decision. Another form of identifying the reason for why Germany surprisingly attacked the Soviet Union would be by looking through the individual level of analysis. In which Hitler’s life experience led to his ambition for worldwide dominance to the destruct ion of communism creating a form of genocide. Adolf Hitler was born on April 22, 1886 in Braunau am Inn, Austria to Alois and Klara Hitler. He was the fourth of six children. His childhood was undesirable. Due to his father’s short temper, and strict manner Adolf Hitler did not have a stable relationship and was unable to pursue a career in the visual art (Keefe, 29). Throughout his childhood, he experienced several losses. Beginning with the loss of his five siblings, which unfortunately did not get toShow MoreRelatedWoodrow Wilson s Treaty Of Versailles1562 Words   |  7 Pagesthat Germany was on strict limitations following world war I. 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