Applications of Pneumatic Systems in Aircraft

Applications of Pneumatic Systems in Aircraft PNEUMATIC SYSTEMS Introduction When talking about pneumatic system, we need to talk about where the pneumatic system comes from and it comes from a power system, there are three different types of power systems, Hydraulic system Pneumatic system Electrical system Pneumatic systems in Aircrafts Pneumatic systems they are also known as vacuum or pressure systems, the power many functions which are important to the aircraft. Power instrument landing gear, flaps, windows, air conditioning, doors and auto pilot devises are some of many operations powered by pneumatic system. Pneumatic and hydraulic systems are similar and use compressed fluids. Fluid property could be liquids as water, oil, or something that flows. And both liquids and gases flow, since they are considered as fluids; however, there is a great deal of difference in the characteristics of the two. Liquids cannot be compressible; a quart of water still occupies about a quart of space regardless of how hard it is compressed. But gases can be compressed, a quart of air can be compressed into a thimbleful of space. Considering this differences gases and liquids are fluids and can be made to transmit power. The type of unit used to provide pressurized air for pneumatic systems is determined by the system’s air pressure requirements. Components in Pneumatic System Hydraulic systems are sometimes compared to, pneumatic systems but some similarities can only be true in general terms. Such as Pneumatic systems do not utilize reservoirs hand pumps accumulators regulators building normal pressure from engine or electrically driven power pumps But similarities do exist in some components. Air Compressors Simply an air compressor is a Pump that compresses air, its job is raising air pressure to above established pressure for use in pneumatic systems on some aircraft, air compressors have permanently installed and added to recharge air bottles when pressure is used to operate a unit. Several types of compressors that are used for this purpose. Some have three stages of compression, while the others have two, depending on the desired operating pressure. Relief Valves Relief valves are used to prevent damage. They act as a pressure limiting units and prevent bursting lines and blowing out seals from excessive pressures. Control Valves Control valves are also a necessary part of a typical pneumatic system. It is used to control conditions such aspressure, flow,temperature, andliquidlevel by fully or gradually opening or closing. Control Valve is also called a Final Control Element. Check Valves Check valves are used in both hydraulic and pneumatic systems. Check valve is also called a one way valve which allows pressurized air to enter the system, but it prevents backflow of air toward the Compressor when Compressor system is stopped which prevent loss of pressure in the system. Restrictors Restrictor is type of control valve used in pneumatic system. Figure below 1llustrates an orifice type restrictor which has a large inlet port and a small outlet port. The rate of the airflow and the speed of operation of the actuating unit will be reduce by the small outlet port. Variable Restrictor The variable restrictor is a type of speed regulating unit it contains an adjustable needle valve, therefore has threads around top and the lower end. Depending on the direction turned and the needle valve turns the sharp point either into or out the small opening to decrease or to increase the size of the opening. Since air entering the inlet port must be able to pass through this opening before reaching the outlet port adjustment determines the rate of airflow through the restrictor. PRESSURE REGULATOR The pressure regulator is to control the maximum pressure in the system and to off-load the compressor when the system is idle. Oil and Water Trap regulator The oil and water trap is designed to remove any water or oil which may be suspended in the air delivered by the compressor. Air Filters Air filters purpose is to prevent oil vapor, dirt or moisture from passing into the various services. It is installed vertically with the drain plug at the bottom. Some advantages are Prevent system contamination Remove air particulates Clean air is essential to good operation Figure 1. View of Cutaway air filter. Air entering the top of section first flows through the element to remove solid particles. Then flows in a circular motion, where centrifugal force separates water from the air stream, andthen the water falls to the filters sump. Storage Bottles Storage bottles act as a reservoir of compressed air which operates all services to pneumatic system. Compressors main use is to build up system pressure when it falls below normal pressure level. The size of the bottles are taken from the volume of actuators and pipelines determines required for the normal and emergency pneumatic services. Storage bottles are generally made of steel, and may use a wire wound construction for maximum strength. Light ally or fiberglass materials may be other typs of material wich will be used. Air Pump Heart of pneumatic system is pressure or vacuum air pump. Which is usually engine driven) There are two basic types: †¢Wet air pumps which use engine oil to lubricate pump internally †¢Dry air pumps which is more common more common have graphite vanes inside pump casing self-lubricate as pump rotates High pressure systems High pressure system is driven by an engine driven compressor feeds air from an unloading valve through the system keeping the pressure. The pressure around this system is 3000 psi but this will vary from manufacturer to another. There will usually also be a ground valve on the aircraft system to enable to pressurize when the main engines are not running. In high pressure systems air is normally stored in a metal bottles at pressures from 1000-3000 psi, depending on the particular aircraft system. Some high pressure systems are Oxygen lines Flaps Breaks Landing gear Low pressure systems Low pressure systems are pressurized up to 1000 psi and uses an engine driven vane type pump. They are may be used to drive Air cons door seals de-ice boots small low power applications Medium-Pressure Systems A medium-pressure pneumatic system usually does not include an air bottle. Instead, it draws air from the compressor section of a turbine engine. Which is generally around 50 to 150 psi This is often called bleed air process and is used to provide pneumatic power for engine starts, engine deicing, wing deicing, and in some cases, it provides hydraulic power to the aircraft systems but only if the hydraulic system is equipped with an air-driven hydraulic pump. Engine bleed air is also used to pressurize the reservoirs of the hydraulic system. Emergency Backup Systems Many aircraft use a high pressure pneumatic back up system source to extend the landing gear or actuate the brakes. And if main hydraulic braking system fails. Nitrogen gas is not directly used to actuate the landing gear or brake system units but applies the pressurized nitrogen to move hydraulic fluid to the actuator. This process is called pneudraulics. Nitrogen Bottles There are two bottles of nitrogen stored for emergency use, mostly bottles located on each side of nose wheel well. Actuation of an outlet valve released by Nitrogen from the bottles. Once depleted, maintenance personnel must recharge the bottles. Fully serviced pressure will be approximately 3,100 psi at 70  °F/21  °C, which is only enough for one extension of the landing gear. PNEUMATIC SYSTEM The illustrator below is a typical full pneumatic system as is used on a twin engine commuter transport aircraft. Each procedure is shown below in dot points Each of the two compressors is a four stage piston type pump, driven from the accessory gearbox of the two turboprop engines. Air is taken into the first stage through an air duct. It is compressed, then passes to the other three stages. From the fourth stage the discharge air is routed through an intercooler and a bleed valve to the unloading valve. The bleed valve is kept closed by engine oil pressure and in an event of a loss of an engine lubricating oil, the valve will open and relieve the pump of any load. The unloading valve maintains pressure between 2,900 and 3,300 psi in the system. When the pressure rises to 3,300 psi a check valve traps it and dumps the output of the pump air overboard. The pump is directed back into the system when the system pressure drops to 2,900 psi. The shuttle valve which is between the compressor and the main system makes it possible to charge the system from a ground source. When the pressure from the external source is higher than the external source of the compressor, when the engine is not running, the shuttle slides over and freezers the compressor. Compressed air system have moisture and this will condense and freeze when the pressure of the air is dropped for actuation because of this every bit of water must be removed from the air. Then a separator collects the water that is in the air on a baffle and holds it until the system is shut down. When the separator’s pressure drops below 450 psi, a drain valve operates and all of the accumulated water is blown overboard. Then an electric heater prevents the water collected in the separator from freezing. After the air leaves the moisture separator, about 98% of its water removed, it passes through a desiccant, or chemical drier, to remove the last traces of moisture. Before the air enters the actual operating system it is filtered through a 10 micron sintered metal filter. In the right engine nacelle a back pressure valve is installed. This is essentially a pressure relief valve in the supply line that does not open until the pressure from the compressor or ground charging system is above 1700 psi and this make sure that the moisture separator will operate most efficiently. The left side where there is no back pressure valve can be connected if it is required to operate the system from an external source of less than 1700 psi. There are three air storage bottles in this type of aircraft system, A 750 cu. Inch bottle for the main system A 180 cu. Inch bottle for normal brake operation A 180 cu. Inch bottle for emergency operation of the landing gear and brakes. Then come the mutually operated isolation valve which allows a technician to close off the air supply so that the system can be serviced without having to discharge the storage bottle. Most of the components in this system operate with pressure of 1000 psi so a pressure reducing valve is installed between the isolation valve and the supply manifold for normal operation of the landing gear passenger door drag brake propeller brake nose wheel steering Since this valve reduces the pressure to 1000 psi it also serves as a backup pressure relief valve. The emergency system stores compressed air under the full system pressure of 3,300 psi and supplies it for landing gear emergency extension. EMERGENCY BRAKE SYSTEM In a failure of the hydraulic system, the pilot of a large aircraft can operate a pneumatic valve on the instrument panel and direct compressed air or nitrogen into the brake system. When the pilot turns the handle, a regulator is adjusted that controls the air pressure to the brakes. When sufficient pressure reaches the brake line, the piston moves up against the force of the control spring and shuts off the inlet valve. The compression of the spring determines the amount of pressure supplied to the brake. When the brake handle is rotated in the direction to release the brakes, the air is exhausted overboard. Then rather than allowing compressed air to enter the wheel cylinder, which would require the entire brake system to be bled of air, the emergency air may be directed into a transfer tube. The air forces hydraulic fluid from the tube into the brake system. Emergency operation of the brakes is also achieved in many aircraft by the use of compressed air. When the pilot is sure that there is no hydraulic pressure to the brakes, the pneumatic brake handle, located on the left instrument panel, can be rotated. Clockwise rotation of this handle increases the brake pressure. Nitrogen pressure released by this control handle forces hydraulic fluid in the transfer tube into the main wheel brakes through shuttle valves. When the brake handle is rotated counterclockwise pressure is released and the nitrogen is exhausted overboard. http://www.engineerstudent.co.uk/uni_directional_flow_control_valve_symbols.html http://navyaviation.tpub.com/14018/css/14018_285.htm http://en.wikipedia.org/wiki/Relief_valve http://mech-engineer.blogspot.com.au/2009/05/drawworks-brake-system-training-course.html http://www.aliexpress.com/airbrush-compressor-regulator_reviews.html http://www.airid.com/high-volume-drain-valve.html http://basicaerospace.blogspot.com.au/2013/01/aircraft-pneumatic-system-for-beginners.html

Curious Incident of a Family Break Up

Curious incident of a family break up Mark Haddon expresses the importance of family relationships within society itself. He does this through the clear and perfect understanding of the deficiency and absence of love portrayed between his parents and himself. Christopher’s suffering of Aspergers syndrome is transparent towards his parents as they find it difficult to react to Christopher’s behavior.Both parents had to deal with Christopher’s persistent obsession with mathematics, numbers (prime numbers used throughout the beginning of every chapter) as their son is a single minded human being with and extraordinary talent faced upon factual data that only he can obtain as many cannot. Christopher’s mother is an important factor among his life as he is told a lie from his father about his mother passing from cancer. But in fact from the hard troubled arguments from the relationship of his parents towards each other, Christopher’s inability to deal wi th affection is a huge factor of why Mr. and Mrs.Boone are driven apart. Christopher does not understand how affection works, which would mean that Mr. and Mrs. Boone do not have a romantic relationship to begin with. If Mr. and Mrs. Boone do not show affection towards each other, it is not setting a very good example towards Christopher. When Christopher’s mother wrote him, she said,† We had a lot of arguments like that, and by the end we stopped talking to each other because we knew it would end up as an argument and go no where. I felt really lonely† (107). Mrs. Boone is giving an example of how she runs away from all her problems leading up to when she left Christopher.The stress of having to raise a child like Christopher drove her to leaving the family. Christopher can be difficult and irritating in many ways because he is unable to show how he feels towards his parents, so they never know how he is feeling. Also, he never knows how his parents are feeling. When Christopher's mother said, â€Å"Christopher, let me hold your hand, just for once. Just for me will you? I will hold it hard†(194). Christopher told her that he did not like holding hands. It proves that he has no knowledge of what love means and affection towards your family. Also, Mrs.Boone said, â€Å"I could not walk for one month, do you remember? Your father had to look after you. I remember looking at the two of you and seeing you two together and thinking how you were really different with him. You were a lot calmer, and it made me sad, because it made the think that you did not need me at all(108). This quote can be confusing, because it is portraying that Mrs. Boone as upset that Christopher did not need her, but yet she leaves the family because of the stress of her autistic child. Mrs. Boone has a confusing way of showing affection, leading Christopher of not having a very good example of a mother.The lack of communication between Mr. and Mrs. Boone and Chr istopher puts a tremendous amount of stress on the family because the Boone’s never know what Christopher may be thinking or wanting at that time. Mr. and Mrs. Boone has to adjust to his ways of communication making it difficult for other people to understand how he communicates. For example, when the policeman grabbed Christopher, but they were never meaning to harm him(8). Christopher thought that by the policeman grabbing him they were trying to hurt him, when only they were trying to get his attention.Also, Christopher does not understand the importance of communication which means that i does not mean a lot of him. The Boone’s do not always know Christopher’s needs and wants. This leads up to Mr. and Mrs. Boone fighting over their views of what Christopher wants. Mrs. Boone would get very stressed out about not knowing what Christopher wants and just basically give up. Christopher can be a difficult child because he can sometimes not know when it is time to stop, and that is what is making Mrs. Boone so stressed out. Christopher might think it is time to play when really Mr. and Mrs. Boone are wanting some quiet time to relax.Haddon persuades the important quality of Truth throughout the novel towards the direction of our society. Christopher’s obsession with truth is organized among the world through his perceptions on the basis. During the story as he feels secure, he needs order and certainty, and facts and logic provide this security. Christopher feels the need to be ‘scared’ and yet ‘shaky’ towards the things that didn’t happen which makes him feel insecure etc. ‘Metaphors’ are a language technique in which Christopher cannot understand. He believes metaphors bring lies towards society as they are false stories and fiction falls within the limits of lies.Christopher accepts ‘similes’ as this technique provides truthfulness and they also emphasize the appearance of what two things have in common. With the acceptation of hard facts within Christopher’s life he refuses to obtain the knowledge and believe of god and the afterlife. Christopher says that he ‘can’t tell lies’. This is the way he truthfully copes with life itself and the imaginary events which fill him with ‘the infinite number of things’. Christopher then pushes the boundaries of lying to himself through continuing the investigation when he told people for example his father he would stop.His father then tends to find out with the quote of â€Å"you knew exactly what you were doing†. During the novel we find out as well as Christopher that his mother is true in fact alive. This is a great impact among Christopher as he hates lying as he quotes â€Å"A lie is when you say something happened which didn’t happen. † Another quote is â€Å"I do not tell lies. Mother used to say that this was because I was a good person†¦i t is because I can’t tell lies. † The repetition and usage of the word ‘And’ creates a sense of comforting and secureness for Christopher as well as a few number of rituals.The usage of ‘And’ provides Christopher with the ability to recount every information or incident he has accounted. As for me it is annoying to read but the fact that Christopher has a good memory for speech is observed. One of the rituals Christopher obsesses with is the observation of cars on the way to school as he organizes them into red meaning good and brown and yellow meaning bad. He implies this to his normal day routine. So if he sees a red car he will have a good/normal day but if he sees a brown or yellow he knows his day isn’t going to go too well. Mr. Jevons asked me whether this made me feel safe, having things always in nice order and I said I did† The justification he gives for using these rituals is formed on the ‘scared’ and Ã¢â‚¬Ë œshaky’ responses which mean that his great need to impose order on a lack of a word is in use. Christopher believes telling the truth is an important aspect among lives as he is revealed that his father killed Wellington the dog and told him that his mother had passed which makes Christopher become very frightened of his father.Christopher flees in terror as he quotes â€Å"†¦he could murder me, because I couldn’t trust him, even though he said, ‘trust me’, because he had told a lie about a big thing† The composer achieves real aspects of telling the truth and telling a lie which happens on a normally daily basis. Christopher’s constant need for attention pushes the Boone’s apart because they have no time for themselves. Mr. and Mrs. Boone revolve their lives around Christopher’s needy lifestyle which led to them to spending every moment with Christopher. Mr.Boone says how he is going to get Christopher ready for his bath, change him, and get him ready for bed(115). This is an example of how he spends every moment revolving his life to Christopher’s need for help because of his disability. In the book, The Curious Case of the Dog in the Night-Time, Christopher display a long list of the things that his mother and father have to deal with on a daily basis with his disability(46). All of these things are responsibilities and other things that Mr. and Mrs. Boone have to keep on their minds through the day.Having an autistic child is like having a second job to Mr. and Mrs. Boone. Mr. Boone gives no attention to Mrs. Boone, because he is always pursuing his life towards the neediness of an autistic child. Mrs. Boone may the want attention from another male, leading her to putting all of her attention towards another lifestyle. This stressful lifestyle caused Mrs. Boone to leave and want to have another life of no worries or responsibilities. Also, Christopher says that he is nervous about his pare nts getting a divorce because they have a child with behavioral problems(45,46).This explains one of the reasons why Mrs. Boone wanted out of the family because she wants to have children that do not give her such a headache every single day. Christopher’s confidence of truthful matter, in logic and facts, does not defend him from the real society. His many efforts to pursue the truth of Wellington’s murder results in the discovery of his understanding with the world as it is based on a lie. Christopher also learns that although he likes to have things â€Å"in a nice order†, real life is often very deranged, and he cannot always control this.By the end of the novel the composer achieves Christopher’s balance as he returns to normal life, he is regained both parents and has the knowledge that he has coped in difficult circumstances. Mark Haddon achieves the novel with great aspects of this and portrays the actual concerns among a society. Mr. and Mrs. Boo ne would have a much more suitable relationship if they would set their priorities straight, and make time for each other to be able to go out and have a romantic night together. Obviously, they did not have a romantic relationship, so that could have driven Mrs.Boone away from the family, along with the difficult lifestyle of raising Christopher. In conclusion, Christopher lived a very spoiled lifestyle by being shown attention by his parents all his life. He could not help that he had to have attention shown towards him because of his disability, but it led to the miserable lifestyle between Mr. and Mrs. Boone. If they could have balanced out their schedules, Mr. Boone would not have had to lie to his child about his mothers death, when really she moved away while having an affair.

What You Dont Know About Cheap Report Writing Could Be Costing to More Than You Think

What You Don't Know About Cheap Report Writing Could Be Costing to More Than You Think The Fight Against Cheap Report Writing Report writing is similar to initiation into college. Business reports are about the facts. Picking a cheap Report writing service is definitely a hard issue. University students who require help with professional dissertations as it regards their final calendar year. Since there are numerous ways about how you can convey a message or information by means of a report, writing a quick report was known to be more effective. Well, now once you've got us to compose a topnotch and inexpensive report, there's no need to postpone your wishes anymore! Some of us will read the summary and just skim the report, so be certain you include all the relevant details. They will read the summary and only skim the report, so make sure you include all the relevant information. If you've already made a decision to order a Report, you should understand how to select a proper Report service. With the right planning, it is going to be less difficult to compose your report and keep organized. Analytical reports may also incorporate recommendations. Yes, your small business report should look pretty. For starters, most people today say you should write out your working hypothesis before you do the experiment or study. Your ideas have to be supported by evidence and theory and, much like the entire report, all sources used needs to be acknowledged and correctly referenced. The ideal way to prepare to write the lab report is to be sure that you completely understand all you will need to about the experiment. You know, if there's 1 thing that won't fly in a business file, it's the unsupported assertion. Report writing comes in various shapes and styles, based on your topic and your supervisor's requirements. 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Is All Sugar Vegan Some Say No

If you are a vegan then you avoid eating or using products made from animals. Its obvious that  meat,  fish,  milk, and  eggs  are not vegan, but what about sugar? Believe it or not, sugar, while a  completely plant-derived product, might actually be a gray area for some vegans. Some sugar refineries use bone char, technically, charred animal bones as part of the filtration process to get white sugar so white. Take a look at the different types of sugars, and find out which use bone char and which do not. Making Sugar Sugar can be made either from sugar cane or from sugar beets. Both are sold in the United States as sugar, white sugar or granulated sugar. Both are the same molecule—sucrose, however, both are not processed the same way. Beet sugar is not filtered with bone char. It is processed in a single step at a single facility.   The prevailing belief is that there is no difference between cane sugar and beet sugar, although some professionals and foodies have noticed differences  in taste and texture due to differences in the trace minerals and proteins. So, if you must have sugar processed from sugar cane, then your chances increase that your sugar will be filtered using bone char. When making sugar from sugar cane, the sugar cane is harvested and cane juice is extracted. Then dirt and other solids are removed from the cane juice and the juice is boiled and evaporated to turn it into a syrup. The syrup is crystallized to make raw sugar, which is brown in color. The raw sugar is sent to another facility to be filtered to become white sugar and the remaining  liquid is turned into molasses. It is the step at the second facility where bone char may be used.   How Is Bone Char Made Bone char is prepared by almost incinerating animal bones to leave activated carbon—a bit like making wood charcoal,  according to Sugar Knowledge International  (SKIL), which describes itself as the worlds leading independent sugar technology organization. The bones come from animals that have been slaughtered for meat. Even if a bone char filter is used, the final sugar product has no bones in it. It is just a filter, which is used over and over again. Since there are no bones in the sugar, some vegans consider refined sugar to be vegan, even if bone char is used in the production. Also, sugar produced in this way can also be certified  kosher. Why Some Vegans Object Because most vegans try to minimize animal use and suffering, bone char is a problem because it is an animal product. Even if bone char  is a by-product of the meat industry, supporting the by-product supports the industry as a whole. Many vegans also find the thought of their food being filtered through animal bones to be disgusting. Does Brown Sugar Use Bone Char? Brown sugar is  white sugar with molasses added back in. Buying brown sugar is not a guarantee of avoiding bone char filtration. However, if you are using unrefined brown sugar, like piloncillo, rapadura, panela, or jaggery, then your sugar source did not use bone char. Does Organic Sugar Use Bone Char? Organic sugar is not filtered with bone char. According to the U.S. Department of Agriculture, Sections 205.605 and 205.606 of the USDA organic regulations identify the non-organic ingredients and processing aids that are allowed in the handling of organic products. Bone char is not listed... its use is not permitted in the processing of certified organic products. Good News for Vegans Bone char filtration is becoming less common in the U.S. Beet sugar now makes up the majority of sugar consumed in the U.S. and it is gaining market share because it is less expensive to produce. Sugar beets grow in more temperate climates while sugar cane needs a hot climate that is not as common in the U.S.   In addition, some refineries are switching to other types of filtration. According to SKIL, Modern technology has largely replaced bone char decolorization but it is still used in a few refineries.   How to Avoid Bone Char To find out if your products contain bone char sugar, you can call the company and ask whether they use bone char sugar. Although, the answer might change from day to day because some companies buy their sugar from multiple suppliers. The best way to avoid bone char is to use sugars that are known to be produced without bone char: organic sugarbeet sugarless refined sugars like demerara sugar or turbinado sugar (e.g. Sugar in the Raw, Florida Crystals, Sucanat)unrefined brown sugar