History Of Brakes And Principles Of Hydraulics Engineering Essay

History Of Brakes And Principles Of Hydraulics Engineering Essay Landing gears are one of the most important parts of the aircraft and play an important role because it can make the aircraft run through runways and lands the aircraft to safety with the aid of the braking system and other systems. The modern brake system has been refined for over 100 years and has become extremely dependable and efficient. The whole draft talks about the hydraulic brake system. Modern braking systems are complicated and understanding the operation of a braking system requires specialized skills and training. Brakes are the most important feature of any modern transportation these days. The principles of brakes in a landing gear of the aircraft gave us the idea that making a simple hydraulic break system would be our main project. The content is designed to show the insight of the principles of operation of the hydraulic break, components and its functions. The advantages and disadvantages against different types of brakes and other terminology. :History oF Brakes: All cars need a brake system; therefore it has been present in the automobile since its invention. However, the technology of the components and the design of the brake system have evolved throughout the years. In the early days of the automobile, drum brakes were the standard. Drum brakes offered several advantages over other types of brakes. One of these was that the drum could keep out water and dust, materials that could damage disc brakes which were out in the open. The other, more important advantage was that drum brakes required drivers to apply less pressure on the pedal as compared to disc brakes. This was especially important in the days before hydraulic and power brake systems, both of which decreased the amount of pedal pressure needed. The next major advancement in brake technology came in 1918 with the invention of four-wheel hydraulic brake systems by Malcolm Loughead. It is interesting to note that Loughead was a member of the Lockheed family, a company known better for producing airplanes. The hydraulic brake system replaced the mechanical brake system that was in use at this time. The mechanical system had numerous disadvantages. It made it difficult to brake all the wheels evenly, often causing a loss of control. In addition, it required drivers to exert tremendous amounts of force on the brake pedal to slow the car. The hydraulic brake system multiplied the force that was applied to the brake, lessening the amount of force needed to be applied to the brake pedal by the driver. This system was first used in the 1918 Duesenberg. Its advantages quickly caught on and by 1929, four wheel hydraulic braking systems were standard equipment on most higher priced cars. It took a few more years for the feature to becom e common on lower price cars. As the speed of automobiles and their weight increased, better braking systems were required. The main problem with drum brakes is that the heat is not efficiently disbursed. The heat that is produced inside the drum does not escape easily since the drum prevents wind from drawing it away. However, disc brakes were open to the passing wind. This allowed the heat to be carried away which increased the efficiency of the brake. It is interesting to note that disc brakes were first used in 1902. However, their use was limited up until the 1950s since their efficiency was not required and they required more pedal pressure to operate. The reason for the higher pedal pressure is that disc brakes have no self-servo effect or no self-energizing capacity that the drum brakes have. The self-servo effect is caused by the forward motion of the car. This forward motion helps pull the brake shoe into contact with the drum. This helped lower the required pedal pressure. Now that their efficiency was needed and the hydraulic brake system multiplied the force applied to the brake pedal, disc brakes seemed to be the better alternative. Chrysler was the first to widely introduce the disc brake in its cars in the early 1950s. The system did not have much success. It seemed that the brake pressure required of the driver was still a little to great for the system to gain widespread consumer acceptance and therefore it was dropped. It finally took the failing automaker Studebaker to reintroduce the system in 1964. This time it saw much more success and in a few years, disc brakes were common on most new cars. One of the reasons that disc brakes were a success with the Studebaker and not the Chrysler was due to the development of the power braking system. Power brakes became common in the 1950s, after Chrysler had developed and dropped its disc brake program. The system assisted the movement of the piston in the master cylinder which meant that the driver needed to apply less peddle pressure to get the same braking effectiveness. Therefore, since ease of braking was no longer an issue, the adoption of the more efficient disc brake became widespread. Another development in braking systems came with anti-lock or anti-skid braking. With conventional braking systems, when the brakes are applied with enough pressure, the wheels will lock up. This results in a loss of steering effectiveness which may cause a loss of control. With anti-lock braking, the wheels do not lock up, allowing the driver to continue steering. Anti-lock brakes are not a new technology. They had been used in large aircraft since the 1950s and the British had used them in race cars in the 1960s. The first automaker to use this technology in its cars was Ford in 1969. It placed anti-lock brakes in the luxury Thunderbird and Continental Mark III. Today, anti-lock brakes are common on many new cars. : Basic Principles of Hydraulics: What is pressure? Pressure can be defined as the force per unit area and is expressed in Newtons per square millimeter (N/mm ²) or in bars and pounds per square inch (lbs/in ²) or p.s.i. in U.S. pressure. Formula: P = F / A Where: P = Pressure; F = Force; A = Area What is hydraulics? Liquids or fluids which are under pressure are usually used to transmit power through pipelines. The fluid power is converted into mechanical power by using rotary or linear actuators. What is Pascals Law? Pascals Law comprises a set of principles formulated in 1648 and states that pressure applied to a confined fluid at any point is transmitted undiminished throughout the fluid in all directions and acts upon every part f the confining vessel at right angles to its interior surfaces and equally upon equal areas. It defines the fundamental principle of power transmission by a hydraulic system. Figure 2: Pascals Law Pressure is created only when: The system is closed There is no air trapped in the system An attempt is made to compress the fluid Another important relationship in hydraulics is the area of the piston, the distance it moves, and the volume of fluid displaced. Formula: Volume =Area * Distance Fluid Compressibility: All liquids have a very high resistance to compression while air has a very low resistance to compression. Liquids used in hydraulic systems are also known as hydraulic fluids. Figure 3: Hydraulic fluid Bramahs Press: States that under a given load, the smaller the area it acts upon the greater the pressure produced and the greater the area under pressure, the greater the force available. Pressure = Load / Area Figure 4: Bramahs Press In an aircraft hydraulic system, Bramahs principle can be applied to the movement of different loads using actuators subject to one pressure. The figure above shows a large load and a small load being pushed by actuators having different piston areas. Bernoullis Principle : The relationship between the velocity and pressure exerted by a moving liquid is described by the Bernoullis principle: as the velocity of a fluid increases, the pressure exerted by that fluid decreases and as fluid decreases, pressure is increased. Figure 5: Bernoullis Principle Figure 6: Bernoullis principle also allows wings to produce lift Hydraulic Fluids: Hydraulic system fluid or liquids are used to transmit and to distribute the fluid to various units to be actuated. They are able to do this because they are almost compressible. If a number of passages exist in a system, pressure can be distributed to all of system by means of the liquid. Manufacturers of hydraulic devices usually specify the type of liquid best suited for use with their equipment, during working conditions, the service required, temperatures expected inside and outside the systems, pressures the liquid may withstand, the possibilities of corrosion, and other conditions. Figure 7: Types of hydraulic fluid Figure 8: Hydraulic Fluid (Aeroshell brand) Properties of Fluid: Fluids are incompressible They have a reasonable density with very little variation changes in temperature. Low rate of change of viscosity with temperature changes Large working range of temperature (-80 °C to +70 °C) Good Lubricating Properties It isnt harmful when in in contact (skin, hands) It doesnt foam Chemically stable with changes in temperature Good storage life Doesnt attack nor damage rubber. Fluid is preferably non-flammable Efficiency: Friction between the fluid and the walls of the pipes depends upon: The velocity of the fluid of the pipelines The bore, length and internal finish of the pipelines The number of bends in the pipelines and the radii of the bends The viscosity of the fluid What is Viscosity? It is one of the properties of hydraulic fluid. Viscosity is internal resistance to flow. Viscosity increases with a decrease in temperature. The knowledge of viscosity is needed for proper design of required temperatures for storage, pumping or injection of fluids. There are two related measures of fluid viscosity known as dynamic (or absolute) and kinematic viscosity. Types of Hydraulic Fluid: 1 Vegetable Based: (MIL-H-7644) is composed of a caster oil and alcohol. It is dyed blue. They are mostly used in older type aircraft. Natural rubber seal are used with vegetable base hydraulic fluid. This type is flammable. And the system may be cleaned with the use of alcohol. Figure 9: Vegetable based fluid 2 Mineral Base: (MIL-H-5606) it is processed from petroleum. It has an odour similar to penetrating oil and is dyed red. Synthetic rubber seals are used with petroleum base fluids. This type of fluid is flammable. They are used in common aircrafts and the precaution is damaging to rubber tyres. Figure 10: Mineral base fluid 3 Synthetic Base: (MIL-H-8446) This is one of the most commonly used fluid of this type. This fluid is of a clear purple colour or either dyed green. They are fire resistant. The seal material used is synthetic butyl Teflon and the precaution is of damaging to surface finishes. Figure 11: Synthetic base fluid These three types of fluids cannot be mixed nor any of them are compatible with each other.

Wedding Speech Delivered by the Groom :: Wedding Toasts Roasts Speeches

Wedding Speech Delivered by the Groom On behalf of my wife and I, I would like to start by thanking Leon for his kind words†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.easily the best $10 I ever spent†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.and I’d like to thank him on behalf of everyone here today for providing the wedding feast. I would also like to thank Leon and Mindy for welcoming me into their family and their kindness and friendship since I first met them, though obviously they didn’t know me at the time else they might have locked their daughter up to keep her safe from me! And on that note I would also like to thank them for providing me with my bride without whom today would have been slightly more difficult even though the best man did offer to stand in†¦...but that’s another story. So, Leon and Mindy, thank you from the bottom of my heart. I would like to thank my own mom and Ian for their support and assistance in making today happen and for welcoming Becky into our family. I would especially like to thank my mom, not only for always being there for me but also because she has tried many times to get Becky to back out of this wedding but she did a terrible job and it went ahead anyway. So thank you so, so much. I would also like to give extra special thanks to Bill and Sarah Fuckley. Without them showing me the way forward, giving such a brilliant example of how two people who love each other should move forward together, I know that I would not have been the happiest man in the world today. So, thanks to you too. I would like to thank everyone here for coming today. I would particularly like to extend a warm welcome to Gary Wilson, a mate from childhood, who came all the way from Bermuda and has asked me to tell you he is young, free, single and filthy rich, and to tell you all that it means a lot to us both that everyone that is important to us could be here not only to celebrate our wedding day but also so that some of you could meet your new relatives – and with that goes my apologies, especially to the children and people with weak hearts in case the particularly ugly ones are scaring you as much as they do me.

Ford Motor Company :: GCSE Business Marketing Coursework

Ford Company Our Hiring ProcessUnderstanding How We HireIf you’re passionate about a career with Ford Motor Company, you want to understand how and why we choose people to join our team. Our hiring decisions are based on an objective evaluation of your skills, experiences and competencies. What are we looking for? What should you expect? Here is a brief explanation of our process. A Two-Step ProcessHiring at Ford Motor Company is a two-step process designed to be quick, thorough and personal. The first phase is Initial Recruiting, which may involve a face-to-face meeting with a Ford recruiter. Its purpose is to review and assess your credentials, experience and background.The second phase is a more in-depth interaction with Ford Motor Company at a Leadership Conference. Conferences are weekend events at a Ford facility. If you’re invited to one of these weekends, you’ll know you’ve made the first cut. Then, based on your performance during the weekend, Ford managers will make a hiring decision. Read on to learn more about the two phases in the hiring process. Initial RecruitingInitial recruiting begins when you meet us--for example, as you explore this site. You can see if our working environment fits your style, find out about career programs and open positions, and read about who we are and what it’s like to work here.If you decide you’d like to join us, you answer an online questionnaire about your skills, experience and background. If this Web-based personal assessment shows you have what we’re looking for, we can invite you to a leadership conference.Some people meet us when we recruit on campus or at a career fair, and in some cases we conduct an interview instead of using our Web-based assessment.If y ou’re invited to a leadership conference, you’ll get on line to schedule your attendance. If you haven’t received an invitation, we continue to consider you for openings unless we notify you otherwise. Please log in frequently to see any new information on your personal page.Leadership ConferenceThe leadership conference is an expenses-paid weekend at a Ford Motor Company facility. This can be a big event, with dozens of guests like you meeting and interacting with Ford people. Our recruiters, managers and other employees will guide you through a series of activities to help you learn whether a Ford career is for you. The conference is an opportunity for both you and us to evaluate each other in depth.

Psychodynamic Theory

Psychodynamic Theory Review In the article â€Å"The Future of Psychodynamic Psychotherapy,† Cortina (2010) reviews past and current issues concerning psychodynamic theory in relation to therapy practices. He describes how and why a once widely accepted and common method of psychological treatment has since suffered a swift weakening in popularity and reliability. Cortina (2010) also speaks about the basic concepts that underlie the psychodynamic theory so that possible interpretations can be drawn as to why this theory has succumbed to such criticism over the decades. Although, the psychodynamic theory does not have a good reputation, Cortina (2010) examines past and current research on how psychodynamic theory is making a comeback, and it’s now supposed effectiveness. The Deterioration of Psychodynamic Theory According to Cortina (2010), one of the tell-tale signs that psychodynamic theory has taken a dive in the world of psychotherapy is because of the decline in related book sales. Not even a decade ago, the bestselling psychoanalytical books were sold by the tens of thousands. Over the past few years, less than 500 have been taken off the shelves and found their way into the hands of appreciating scholars. A proposed reason for this is that Freud’s credibility has been lost. Although there was not adequate scientific evidence to back up his theories back in the day, a lot has changed in the past century. Unfortunately, Freud’s theory has become nothing more than a â€Å"postmodern-deconstructive philosophy† (Cortina, 2010, The Decline of Psychoanalysis, para. 4). Concepts of Psychoanalytical Theory Shendler (2010), as referenced by Cortina (2010), list some basic concepts of the psychoanalytical theory. People act according to unconscious processes and impulses. When those processes become conflicted with one another, trouble ensues. People also respond to emotional processes. Recognizing and accepting conscious and unconscious emotions are essential to psychoanalytical theory. This theory focuses on defense mechanisms. People tend to behave in ways that are not in context with what is going on. Psychoanalytical theory has a tendency to pay close attention to the development of the mind. How a person thinks and perceives can reveal a lot about what is going on in the mind. Social processes are also important especially how individuals relate to and communicate with one another. Lastly, psychoanalytical theory focuses on dreams and a person’s imagination. These are the doors to the unconscious. Research Cortina (2010) provides evidence from past and current research that favors psychoanalytical theory. Science has come a long way in the past decade; therefore, scientists have a better understanding about what is really going on in the human mind. With the use of tools such as the MRI, they can make connections between thoughts, emotions, actions, and specific areas of the brain and other physiological processes. Researchers have also obtained a wealth of information from case studies. Although many are still skeptical about the reliability of psychoanalytical theory, evidence has shown many strengths and benefits of this theory. Conclusion Regardless of the unpopularity of psychoanalytical theory, opinions and attitudes are starting to change. There is a considerable amount of evidence that supports the ideas behind and the benefits of this theory. Since only a small percentage of practitioners receive specialized training in psychoanalytical therapy, much has to be done to convince the public and academic sector that psychoanalytical theory is not a fairytale. Personal Perspective I believe that the psychoanalytical perspective to psychotherapy has many good qualities, as well as, some questionable qualities. I agree with Cortina (2010) that this theory is making some great strides to prove itself worthy in the scientific field. I do not fully adhere to the notion that many of our actions are driven by unconscious motives because that tends to take accountability and choice away from the individual. I am fascinated by this theory only for the purpose of study, not in practice. Reference Cortina, M. (2010). The future of psychodynamic psychotherapy. Psychiatry: Interpersonal and Biological Processes, 73(1), 43-56. doi:10. 1521/psyc. 2010. 73. 1. 43 Psychodynamic Theory Psychodynamic theory is a view that explains personality in the terms of unconscious and conscious forces, such as beliefs and unconscious desires. Sigmund Freud in the early 20th century proposed a psychodynamic theory according to which personality consists of the ID. The ID is responsible for instincts and pleasure-seeking. He also proposed the idea of the superego which attempts to obey the rules of society and parents.The superego is split into two parts, conscience and the ego ideal. The conscience tells what is right and wrong, it forces the ego to control the id and it directs the individual into morally acceptable and responsible behaviors, which could not be pleasureable. Lastly the Ego which mediates between the id and the superego according to the demands of reality. What psychodynamic theories do are they commonly hold that childhood experiences shape one’s personality. Such theories are associated with psychoanalysis which is a type of therapy that attempts to re veal unconscious desires and thoughts.Not all psychologists use or accept psychodynamic theories, critics claim that the theories lack scientific data that supports the theories. Other theories of personality include humanist and behavioral theories (Siegel, 2013). Psychodynamic theorists believe that offenders have id-dominated personalities. They can lose control the ego and the id’s need for instant gratification will then take over. This will then cause impulse control problems and increased pleasure-seeking drives. Other problems that are associated with a damaged ego are poor social skills, immaturity, and excessive dependence on other people. The idea with this is that negative experiences in an offenders childhood will damage the ego, therefore, the offender is then unable to cope with conventional society (Siegel, 2013).This theory can be attached to Bowbly’s theory of Attachment. Bowlby had proposed that the ability to form meaningful social relationships in adulthood was merely dependent on a close, warm and continuous relationship with the mother in the first few years of life. Since this relationship serves as a prototype for all future relationships, disruption to this could impair a person’s ability to relate to others therefore causing roots of criminality, and lead to â€Å"affection less psychopathology†. So therefore, this explains crime by the root causes of crime because it depends on relationships with your mother when you are young (1-5 years old). The key  subjects are juveniles. As talked about previously, this theory correlated with Bowlby’s Attachment theory (Maxwell, Spielmann, Joel & MacDonald, 2013).At early stages the key subjects are juveniles, because they’re out lashing due to the lack of emotional attachment at the early stages in life, and then adults because they never got to experience an emotional attachment throughout the early and then later years of life.There are various way s that psychodynamic theory and attachment theory have been tested throughout the years. After much research, one study that was found was a Relationship Attachment Syle Text. The main basis of this tests background is how from the beginning years of life, we develop an attachment to our primary caregivers that tends to remain constant if it is present. It has a profound effect that is not only on our emotional development, but is also upon the health of our relationships.In this test attachment styles that are conveyed are Secure, Dismissive-Avoidant, Fearful-Avoidant, Codependent, Dependent, and Anxious Ambivalent. This will assess your relationship style and it will show how it affects your relationships in your personal life all just by taking this test. It asks you a serious of questions that you rate 1 being the most true and 5 being the most false about you (Haggerty, 2010). This has been used as a basis for public programs, and also private programs. It can be assessed simpl y in a classroom setting when learning about the psychodynamic/ attachment theory, and it can be used in a clinical setting where the therapist is trying to see where the client is relationship wise in their life.This test is important, and it is widely used , and it is grounded in a valid and well-established theory. There was evidence that this is a valid test. With research by (Brennan et al., 1998; Fraley & Waller, 1998) that the greatest weight of the results that were found were deriving from multi-item dimensional measures because they have demonstrated greatly the best precision and validity. They strongly encourage more researchers that are interested in peer relationships to continue to use and explore the old measures that are used and determine the advantages and their limitations. They also encourage them to continue to concern themselves with measurement issues in this certain domain, seeing there are still gaps that are waiting to be filled and improvements to be made while assessing attachment (Brennanet al., 1998; Fraley & Waller, 1998).This test has found to have a wide range of uses, especially for the environment that it is used in (personal, clinical, educational etc). It is not necessarily used for all crimes, but it can be used with juveniles in crime because it can help determine their psychosis and what environmental factors could be associated with their behavior.After extensive research of the psychodynamic/attachment theory and the culture conflict theory, these theories do not belong in the same class of theories. Though they do look at crime and can help explain the root causes or explain why crimes have happened, they are different theories that do not belong in the same class. The psychodynamic theory is an evolutionary theory and attachment theory is a psychological theory. Culture conflict theory is an environmental-based theory. The similarities that these theories share are the fact that bonding has a very important lasting psychological implications. Also another similarity that these theories share is showing how in an overall setting, society creates these bonds and they stick completely together.Culture conflict occurs when rules are expressed in the criminal law clashes with the demands of group conduct norms, therefore this theory is an outcome of an event. Psychodynamic theories focus on the time of the event, on their instinctive drive and forces (from their id, superego, ego), so this in objective, and also can be an outcome. That goes for attachment theory as well, because attachment theory is the ability to bond to other people has important lasting psychological implications across someones life span, so this is the outcome of previous behaviors and attachments with people in ones life.A typology of crime that is believed to to explain psychodynamic theory in some sort of way that is also integrated with Bowlby’s theory of attachment is underage drinking. This kind of crime could be well-explained with this theory because of the reaction people have to the lack of control over their id, ego and superego as well as lack of attachment which leads them to leaning onto something else to get the pain away. Through a study to begin research has indicated that peer and maternal bonds play important but sometimes competing roles in the outcomes of kids. This study hypothesized  that secure parental attachment predicted anti-alcohol attitudes and behavioral control. Norms, alcohol attitudes and behavioral control are each uniquely explained variance in intentions, which has forecasted a significant increase in alcohol behavior a month later.Peer and parental attachment were each indirectly predicted future behavior. The results obtained from the longitudinal research were theoretically and practically informative for recognizing the contrasting interpersonal forces of peers and parents on the high risk beliefs of young adults. After research, the protective benefits t hat arose from attachment bonds to parents extended even into early adulthood. The findings support recommendations for interventions designed to curtail the risky levels of underage drinking based on the tenets of attachment theory (Lac, 2012). A scenario that fits this type of crime is the parents that influence the child are heavy drinkers.The environment of the child growing up around excessive alcohol drinking will lead to the influx of the child thinking it’s okay to drink, and want to drink because it’s ‘cool’ and their parent’s do it as well. The influence of this could potentially lead to children starting to drink as early as possibly age 13. This can lead into possibly getting into drugs as well. Getting caught with underage possession of alcohol can be a slap on the wrist at first, however if they get into a vehicle and they are driving and get in an accident the consequences arise drastically. You could potentially get jail time if you kill someone, get your license revoked, points on your license and quite a big fine.The theory could be challenged in the fact that underage drinking could be because of the influence of other teens, and not completely the parents influence. It could be argued in the psychodynamic theory that the id is taking over and telling the person that it will be fun, and there will be no consequences or it could be considered a normal thing, so when it comes to the ego (the reality principle) nothing will seem wrong to them, when actually, it is a morally wrong act with consequences because the legal drinking age is 21 years old.Psychodynamic theory overall, is an insight-oriented therapy that focuses on unconscious processes as they are manifested in a person’s present behavior. Goals of this therapy are a client’s self-awareness and the understanding of the influence of the past on present behavior. The goal  of psychodynamic therapy are a client’s self-awareness and the understanding of the influence of the past on present behavior. The approach of this theory will enable the client in a therapy setting to examine unresolved conflicts and symptoms that arise from dysfunctional relationships and manifest themselves in the need and the desire to abuse substances and other criminal behaviors. It is by far one of the oldest modern therapies/theories.It is extremely developed and multi-faced theory of human development and interaction (Haggerty, 2010). Because of the extensive research there is on this theory, how old this theory is, and the validity of this theory/therapy, this theory is a more useful/valuable to preventing, approaching and evaluating crime. Having Bowlby’s work correlating with this theory shows how much more extensive it can get because of how close attachment theory correlates. Basically, attachment theory as stated previously is the emotional bond to another person. Attachment as Bowlby stated is a â€Å"lasting psychol ogical connectedness between human beings† (Lac, 2012).Developing a bond in your early years of life with your caregivers (especially your mother) has a huge impact that will follow someone throughout their life. Bowlby stated that attachment serves to keep the infant close to their mother, thus improving the child’s chances of survival (Schaffer & Emerson, 1964). One social problems that this theory could help try to solve or possibly prevent is substance or alcohol abuse. When children have a lack of emotional stability in their lives, they turn to something that they will feel connected with, and will replace the hole that the lack of parental involvement in their lives. Then once they become addicted to the substance they use or alcohol they feel a sense of fulfillment which helps cope with their lack of relationships with people.This theory can help prevent or transition their lives and fill the hole of abandonment and help create a healthy emotional stance in thei r lives which will help prevent the addictions.