Academic literature on the topic 'Discus throw'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Discus throw.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Discus throw"

1

LeBlanc, J. A., and M. L. Ireland. "SHOULDER INJURY ??? DISCUS THROW." Medicine & Science in Sports & Exercise 34, no. 5 (May 2002): S9. http://dx.doi.org/10.1097/00005768-200205001-00047.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Miskalena, Miskalena, and James A. P. Tangkudung. "ARM MUSCLES EXPLOSIVE POWER TO INCREASE DISCUS THROW SKILL." JIPES - JOURNAL OF INDONESIAN PHYSICAL EDUCATION AND SPORT 1, no. 1 (May 8, 2017): 1. http://dx.doi.org/10.21009/jipes.011.01.

Full text
Abstract:
The purpose of the study is to find out the relationship among arm muscles explosive power, body core flexibility, achievement motivation and discus throw skill. In this case, the samples totaled 50 students from study program of physical education, faculty of pedagogy and science education "Syiah Kuala" University involving 100 (male) students selected by simple random sampling technique. This research using survey method, quantitative approach and correlational technique. The research concludes (1) it has positive relationship between arm power explosive power and discus throw skill (2) it has relationship significantly between body core flexibility and discus throw skill. (3) the relationship is positive between motivation and discus throw skill, (4) it has positive relationship among arm muscles explosive power, achievement motivation and discus throw skill. Keywords: explosive; flexibility; motivation and discus.
APA, Harvard, Vancouver, ISO, and other styles
3

Gregor, Robert J., William C. Whiting, and Raymond W. McCoy. "Kinematic Analysis of Olympic Discus Throwers." International Journal of Sport Biomechanics 1, no. 2 (May 1985): 131–38. http://dx.doi.org/10.1123/ijsb.1.2.131.

Full text
Abstract:
The purpose of this investigation was to record the performance of all male and female competitors in the discus throw during the 1984 Olympic Games. The final rounds of the men's and women's discus throw were filmed at 120 fps using two high-speed 16mm LoCam cameras. Height, angle, and velocity of the discus and the thrower's trunk angle were measured at release in the best three throws of the Gold, Silver, and Bronze medalists in both the men's and women's division. Little difference was observed between men and women regarding the angle and velocity of release, and results were comparable with those from previous studies on elite performers. But differences were observed in foot position at release and height of release between men and women. It appeared the men had more vertical thrust in taking them off the ground prior to release and, even relative to their greater body height, released the discus with a higher arm position. The three-dimensional nature of this event precludes any further interpretation at this time.
APA, Harvard, Vancouver, ISO, and other styles
4

Bartlett, Roger M. "The biomechanics of the discus throw: A review." Journal of Sports Sciences 10, no. 5 (October 1992): 467–510. http://dx.doi.org/10.1080/02640419208729944.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Sueyoshi, Yasuhiro, and Atsuo Maruyama. "Optimal release angle on discus throw through computer simulation." Journal of Biomechanics 25, no. 7 (July 1992): 717. http://dx.doi.org/10.1016/0021-9290(92)90362-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Dapena, Jesus. "An analysis of angular momentum in the discus throw." Journal of Biomechanics 27, no. 6 (January 1994): 660. http://dx.doi.org/10.1016/0021-9290(94)90959-8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Judge, Lawrence W., and David Bellar. "Using Sport Science to Improve Coaching: A Case Study of Paralympic Track and Field F44 Discus Throw Gold Medalist Jeremy Campbell." Journal of Coaching Education 6, no. 2 (August 2013): 196–97. http://dx.doi.org/10.1123/jce.6.2.196.

Full text
Abstract:
The discus throw is a complex track and field event combining linear and angular motion. Success in the discus throw necessitates being strong and explosive; but due to the complexity of the event, throwers must be technically sound. The basic throwing technique employed by all discus throwers is similar, but variations are present due to anthropometrics, physical abilities, training, and error influences. Working with a Paralympic discus thrower, that has a physical disability, is a unique coaching challenge that makes it important to individualize the technical model to meet the physical abilities of the athlete.
APA, Harvard, Vancouver, ISO, and other styles
8

Sinulingga, Andrew, Deny Pradana Saputro, and Andi Nova. "The Differences Between Learning Model of Inquiry and Direct Instruction Toward Learning Outcomes of Discus Throw." Journal Sport Area 6, no. 1 (January 5, 2021): 20–27. http://dx.doi.org/10.25299/sportarea.2021.vol6(1).4856.

Full text
Abstract:
Determination of the learning model in the process of teaching and learning activities will determine the success of students, especially in physical education lessons. A Teacher is demanded to be able to choose the right learning model according to the needs in the field. The study in this research means to find out the differences of learning model of inquiry and direct instruction on learning outcomes of discus throw. The subject of the study is students of grade IX in State Junior High School 3 Pekanbaru. The research method is an experiment, which each group is 15 students in inquiry learning models and in direct instruction models. The instrument in this research is the discus throw which consists of the phases of holding the discus, beginning, throwing, and followthrough. T-test is analysis technique of the data in this study by presenting two different learning groups. The result of the research is found the difference of the learning outcomes of discus throwing on students of grade IX in state junior high school 3 Pekanbaru by implementing both of inquiry learning model and direct instruction in learning of discus throw. Inquiry learning model in this study shows better results than direct instruction. The gain of an average value of student amount 13.5, whereas the average value of students in direct instruction is 12.0. So that it can be concluded that the inquiry learning model is better tobe implemented for learning of physical education especially on discus throw lesson than the implementation of direct instruction in State Junior High School 3 Pekanbaru.
APA, Harvard, Vancouver, ISO, and other styles
9

Kim, Sang-Doo. "A Kinematic Analysis of Discus Throw Motion of Visually Impaired." Korea Journal of Sport 18, no. 3 (September 30, 2020): 1279–85. http://dx.doi.org/10.46669/kss.2020.18.3.115.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Dapena, J. "THE START OF THE FINAL PROPULSION IN THE DISCUS THROW." Medicine & Science in Sports & Exercise 30, Supplement (May 1998): 129. http://dx.doi.org/10.1097/00005768-199805001-00737.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Discus throw"

1

Wolpert, Benjamin S. J. [Verfasser], Hans Peter [Akademischer Betreuer] Schmid, Annette [Akademischer Betreuer] Menzel, and Jose [Akademischer Betreuer] Fuentes. "Emission and abundance of biogenic volatile organic compounds in wind-throw areas of upland spruce forests in Bavaria / Benjamin Wolpert. Gutachter: Annette Menzel ; Jose Fuentes. Betreuer: Hans Peter Schmid." München : Universitätsbibliothek der TU München, 2012. http://nbn-resolving.de/urn:nbn:de:bvb:91-diss-20120925-1116494-1-4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Goisser, Michael [Verfasser], Rainer Akademischer Betreuer] Matyssek, Christian [Akademischer Betreuer] [Ammer, and Egbert [Akademischer Betreuer] Matzner. "Establishing Fagus sylvatica under annually recurring summer drought : Experimental forest restoration upon wind-throw of Picea abies in view of climate change / Michael Martin Goisser. Gutachter: Christian Ammer ; Egbert Matzner ; Rainer Matyssek. Betreuer: Rainer Matyssek." München : Universitätsbibliothek der TU München, 2014. http://nbn-resolving.de/urn:nbn:de:bvb:91-diss-20140710-1197661-0-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Matěcha, Miroslav. "Biografie sportovní kariéry Imricha Bugára." Master's thesis, 2011. http://www.nusl.cz/ntk/nusl-300250.

Full text
Abstract:
Title: Sports career biography of Imrich Bugár Objectives: The main aim of this paper is to evaluate and present a twenty-year long sports career of discus-thrower Imrich Bugár by the means of content analysis of newspaper articles published in the journal Czechoslovakian sport. Methods: Biographic research was used as one kind of a case study. The paper is divided into three main parts. The first part is concerned with the summary of all newspaper articles written during Bugár's sports career. I have statistically categorized the articles according to the criteria stated by Jan Volf in his diploma paper of 2007. The second part of the paper is concerned with information gained from Imrich Bugár personally, during a conducted interview. The third part shows a summary of Bugár's best achievements. Results: Based on the accessible materials, I have described and evaluated the sports career of Imrich Bugár. In total, I have evaluated n = 348 articles concerned with his sports career. The next part presents a commented evaluation of the conducted interview with Imrich Bugár. When categorization of the articles is taken into account, most articles about the course of Bugár's career are of an informative character and describe his participation in competitions. Imrich Bugár participated in n = 433...
APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Discus throw"

1

Calder, Scott E. The effects of specificity in plyometric training for the discus throw. Eugene: Microform Publications, College of Human Development and Performance, University of Oregon, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Kevin, McGill, ed. The throws manual. 2nd ed. Mountain View, Ca: Tafnews Press, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Anita, Verschoth, and Schmidt Wolfgang 1954-, eds. Thrown free: How the East German sports machine molded, trained, and broke an Olympic hero and how he won his fight for freedom. New York: Simon & Schuster, 1991.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Johnson, William Oscar. Thrown free: How the East German sports machine molded, trained, and broke an Olympic hero and how he won his battle to be set free. New York: Simon & Schuster, 1991.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Srivastava, A. K. How to Coach Discus Throw. Sports Publication, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Publishing, Sunshine. Look at Me Coaching Discus Throw and Shit: Funny Notebook for Discus Throw Coach, Christmas / Birthday / Appreciation / Thank You Gag Gift for Discus Throw Coach. Independently Published, 2020.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Publishing, discus throw. Look at Me Coaching Discus Throw and Shit: Funny Notebook for Discus Throw Coach, Christmas / Birthday / Appreciation / Thank You Gag Gift for Discus Throw Coach. Independently Published, 2020.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Throw For Gold. Hodder & Stoughton, 2012.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

The effects of specificity in plyometric training for the discus throw. 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

The effects of specificity in plyometric training for the discus throw. 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Discus throw"

1

"Discus: Standing throw." In Athletics Challenges, 175. Routledge, 2013. http://dx.doi.org/10.4324/9780203821510-31.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

"Modelling and simulation in discus throw." In Routledge Handbook of Ergonomics in Sport and Exercise, 525–37. Routledge, 2013. http://dx.doi.org/10.4324/9780203123355-55.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Niewiadomski, Igor Michał. "Olympic Spirit in Jadwiga Wajsówna’s Life in a Book "Z Dyskiem przez Świat" [Around the World with Discus Throw]." In Z najnowszych dziejów kultury fizycznej i turystyki w Polsce i w Europie (w okresie XIX–XX wieku), 105–18. Wydawnictwo im. Stanisława Podobińskiego Uniwersytetu Humanistyczno-Przyrodniczego im. Jana Długosza w Częstochowie, 2018. http://dx.doi.org/10.16926/zndkftpe2018.07.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Henig, Martin. "‘The Race that is Set Before Us’: The Athletic Ideal in the Aesthetics and Culture of Early Roman Britain." In Communities and Connections. Oxford University Press, 2007. http://dx.doi.org/10.1093/oso/9780199230341.003.0034.

Full text
Abstract:
I first met Barry Cunliffe when I came to dig at Fishbourne, and I still remember my amazement at seeing what were clearly stylobate blocks of Mediterranean type being unearthed. In that first season I excavated for only three days, but the memory lingered with me and I later returned to supervise on the east and north wings of this extraordinary site. Subsequently, on my arrival in Oxford to embark on a doctoral dissertation upon Roman intaglios and cameos excavated from British sites, I wrote to Barry to ask whether he knew of any gemstones I might not yet have located. In a characteristically terse, but very courteous and helpful, reply he told me there were over thirty at Bath and that if I were to write them up in two or three months he would be delighted to publish my work in a Research Report he was preparing for the Society of Antiquaries (Henig 1969). Thus, I owe to Barry my first lucky break in the Weld of archaeological publication. Subsequently, and not too long afterwards, I was invited by him to publish the gems from Fishbourne (Henig 1971). It seems appropriate to return to those intaglios from Bath and Fishbourne, in order to survey a little of this glyptic evidence, in association with gems and other material from elsewhere, in order to explore a very small but fascinating aspect of a theme which has so often aroused Barry’s attention and mine, that of Romanization or, as we have been urged to call it by Greg Woolf, ‘Becoming Roman’ (Woolf 1998) especially in the first century BC and first century AD. My starting point will be an intaglio from Bath cut with a Greek theme, that of a discobolos who is about to throw his discus (figure 24.1). In front of him is his prize, a palm in a vase. This image has previously been used by me to illustrate an essay about Greek themes in Romano-British art (Henig 2000: 133, fig. 5) for the spa at Bath was clearly a sophisticated cultural centre with connections across the Graeco-Roman world ; and it has long seemed very probable that the patron who sponsored this stupendous work was none other than the Atrebatan client ruler Tiberius Claudius Togidubnus, whose titulature as Great King in Britain must surely have been borrowed from the Hellenistic East (Bogaers 1979; Henig 2000: 126).
APA, Harvard, Vancouver, ISO, and other styles
5

Viswanathan, Revathi. "Effectiveness of Teacher Training in Using Latest Technologies." In Encyclopedia of Information Science and Technology, Fourth Edition, 7635–46. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-2255-3.ch664.

Full text
Abstract:
In this chapter, the author would elaborately discuss the workshop, which she conducted for teachers (who represented various Indian states) and trained them in using the hand-held devices for teaching language skills. Further, she would throw light on the responses given by the participants, which reflected the effectiveness of the program.
APA, Harvard, Vancouver, ISO, and other styles
6

Rysst, Mari. "Kulturelle verdier og barnevernet: Ulike forståelser av «barnets beste»." In Verdier i barnevern, 89–111. Cappelen Damm Akademisk/NOASP, 2020. http://dx.doi.org/10.23865/noasp.103.ch5.

Full text
Abstract:
In this chapter I discuss cultural values related to child protection services (CPS). More precisely, I focus on professionals working in CPS and their relationship and meetings with families of immigrant origins. These meetings often reflect different cultural values and understandings of “the best interest of the child” and may cause tensions and misunderstandings. In the Norwegian CPS system, professionals have to draw on professional and personal experiences in decisions concerning the “best interest of the child”. This chapter uses concepts and perspectives from psychological anthropology to throw light on these processes. This is because these perspectives show how ideas and experiences are internalized and embodied as dispositions in habitus that may motivate certain actions when professionals and immigrant families meet. I also discuss whether some reactions and advice from professionals may be understood as ethnocentric because Norwegian parenting values are presented as “better” than parenting values from other countries.
APA, Harvard, Vancouver, ISO, and other styles
7

Vodickov√°, S. "Kinematic Analysis of the Best Throws of the World Elite Discus Throwers and of the Olympic Winner in Decathlon." In The Impact of Technology on Sport II. Taylor & Francis, 2007. http://dx.doi.org/10.1201/9781439828427.ch87.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Stallings, Laurence. "“Gentleman from Mississippi”." In The Dixie Limited. University Press of Mississippi, 2016. http://dx.doi.org/10.14325/mississippi/9781496803382.003.0007.

Full text
Abstract:
This chapter is an essay which looks at William Faulkner's novel Pylon, the story of a group of barnstormers who are typically Faulknerian in their curiously compelling sympathies which transcend a natural impulse of disgust. The characters include a pilot, a parachute-jumper, and a woman shared by the two, as well as a little boy whose parentage is settled by a throw of the dice, a mechanic, and a newspaperman. The barn-storming group is competing with a worthless old crate for a speed trophy at an aviation meet in the city of New Valois. The text praises Pylon, saying that “it is pleasant to adventure into the imagination of the curious gentleman from Mississippi”.
APA, Harvard, Vancouver, ISO, and other styles
9

Lippman, Alexandra. "Cash." In Paid, edited by Bill Maurer and Lana Swartz. The MIT Press, 2017. http://dx.doi.org/10.7551/mitpress/9780262035750.003.0009.

Full text
Abstract:
This chapter juxtaposes two artistic interventions into money: one, an “occasional coffee shop” where patrons are exhorted to “throw $$ on the floor;” the other, the work of artist MáximoGonzálzez, who creates installations out of cut and folded decommissioned banknotes. This juxtaposition allows the author so discuss the relationships among money, waste, art and payment. Venturing into “Squamuglia,” a pop-up coffee shop and/or artistic performance in Los Angeles presents an occasion to reflect on physical banknotes, art and philosophy with Squamuglia’s host, Ben Turner. Merging sound, objects, refuse, trees and branches, plastic, wooden beams and other items, Turner’s coffee shop went through diverse, always different iterations, each one, however, centered around serving espresso coffee drinks, and an exhortation to pay—or not—by throwing money on the floor. Ben would collect the money, which would usually have become dirty, and wash it with soap and a sponge before recirculating it. Yet he felt that this made the bills less “vibrant.” Money’s dirtiness or vibrancy also has to do with its relationship to the state, a theme explicit in González’s art.
APA, Harvard, Vancouver, ISO, and other styles
10

Vyas, Sonali, and Deepshikha Bhargava. "Big Data Utilization, Benefits, and Challenges for Smart City Implementation." In Advances in Data Mining and Database Management, 42–54. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7432-3.ch003.

Full text
Abstract:
With the rapid advancement of technology, everything is transforming into smarter versions. The term smart city means a technologically strengthened and advanced version of the city. Smart cities utilize digital information and techniques for improving services like performance, quality, etc. Big data technology and methods are utilized for handling the vast volume, high velocity and wide variety of data related to cities. This chapter discusses the big data utilization for making smart cities and also throws light on various applications where efficient analysis of services can be carried out using Big Data techniques. The main objective of this chapter will be to provide knowledge of big data implementation for the smart city and its services. This chapter will also investigate various prospects, benefits, and challenges of absorbing big data utilization for smart cities. It will also discuss some case studies related to big data applications for smart city services. It will also propose some open issues related to big data implementation for the smart city.
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Discus throw"

1

Shuangwei Xie, Quanjun Song, Ming Liu, and Yunjian Ge. "Research on a throwing information acquiring system for discus-throw athletes." In 2007 IEEE International Conference on Robotics and biomimetics (ROBIO). IEEE, 2007. http://dx.doi.org/10.1109/robio.2007.4522194.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Brickman, Dennis B. "On the Safety of Agricultural Disc Mowers." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0142.

Full text
Abstract:
Abstract A thrown object test protocol was developed and performed based on agricultural rotary mower safety standards to analyze the safety of an agricultural disc mower. Test results reveal a relationship between the guard to ground clearance and the quantity of thrown objects striking the operator zone target. Application of the Safety Hierarchy systematically explores safety strategies for mitigating the thrown object danger.
APA, Harvard, Vancouver, ISO, and other styles
3

Loule, Jeffery M. "Effective Utilization of Design Geometry for Numerical Analysis Applications." In ASME 1992 International Computers in Engineering Conference and Exposition. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/cie1992-0026.

Full text
Abstract:
Abstract In many instances, companies are using design automation software from different software suppliers to perform their design and analysis functions. Selection of the software applications were probably based on “Best in class” and organizational requirements many years before the need to move analysis on to the critical design path was not even imaginable. The advances in technology in only the last few years has made the leveraging of design geometry for analysis possible. It would be impractical to throw away the legacy system in order to integrate the design and analysis function. Therefore, it is important to have the technologies and software applications which can efficiently use geometric data from the design application in the analysis application. This paper will discuss some of the issues with using design geometry and ways to address the issues. The paper discusses some of the “real life” issues of trying to use geometry created from design systems for analysis applications. It proposes a multi-step approach to efficiently utilize design geometry for analysis applications. The paper will discusses the advantage and disadvantages of proprietary versus international data exchange standards. It will also identify the necessary functionality to modify geometry within the analysis application. To illustrate the productivity of this approach, the paper will go through the process of modifying design geometry of a hand held video camera for a finite element mesh.
APA, Harvard, Vancouver, ISO, and other styles
4

Jettappa, Richard Rodrigues. "Pseudo-Density Approach to the Solution of a Thin Rotating Turbine Engine Disk." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-23528.

Full text
Abstract:
This paper considers a rotating gas turbine engine disk. The governing equations lead to a non-linear, second order equation with thickness h as parameter. “Thin disk” assumption is made, implying plane stress conditions. In the present study, starting from the equations of equilibrium and compatibility, the author proposes the new approach of Pseudo Material Density. By introducing a pseudo material density, the problem is reduced to the Flat Disk Equation that can be solved easily. Introduction of pseudo density, however, throws up an additional equation — a fourth one — relating the pseudo density, actual density and the thickness parameter. The equation is solved to find the shape of the disk in terms of the actual density. This procedure allows modeling of the non-uniform profile disk as a disk with flat profile facilitating easier analysis. An unexpected, but important result that emerges from the present study pertains to the proof testing of rotating disks. It is shown that it is now possible to replace the external blade loading exactly with a radial extension of the disk itself.
APA, Harvard, Vancouver, ISO, and other styles
5

Pierce, William H., and Ben T. Railsback. "Boom Lift Operator Protection From Stored Energy Hazards." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66743.

Full text
Abstract:
Boom lifts are useful throughout a variety of industries, such as manufacturing, maintenance service, real estate management, and construction. Boom lifts are designed to allow operator mobility at high elevations and are often used as a substitute for traditional ladders, man-baskets on lift trucks and scaffolding. Although boom lifts are very practical and efficient in allowing personnel to work at high elevations and in areas with limited access, several known hazards exist with boom lifts such as falls, machine tipping, crushes, collapse of machine and electrocution. Although boom lift operator manuals and safety literature discuss the aforementioned hazards, they do not or incompletely discuss the hazard of suddenly released stored energy when stored energy is rapidly converted from potential energy to kinetic energy through the boom to the operator platform. One example of rapid conversion of potential energy to kinetic energy involves the boom lift driven over a sudden drop off such as a curb. A relatively low drop off can be amplified substantially by the lever arm of the boom, and as a result, the operator platform and operator(s) within, rapidly accelerate. A second example is when the operator platform is snagged on an external structure and continued hydraulic movement builds up potential energy within the boom. The buildup of potential energy can suddenly and unexpectedly release if the platform springs free from entanglement with the structure. Such release results in the boom, the platform, and the operator(s) rapidly accelerating. During the rapid acceleration experienced in both examples, operators can potentially be and have historically been violently thrown against the railing of the platform, ejected from the platform, and/or crushed by any nearby overhead obstacles. The purpose of this paper is to address, analytically quantify, and propose engineering solutions to guard against the sudden conversion of potential energy to kinetic energy on boom lifts. This hazard is currently not discussed or incompletely discussed in boom lift operator manuals and safety literature. Analytical techniques are used to quantify the rapid acceleration experienced by operator platforms and operators upon the sudden conversion of potential to kinetic energy in various scenarios. Further, the principles of safety engineering are utilized to determine methods to eliminate or reduce the frequency and severity of injuries associated with the sudden conversion of potential to kinetic energy on boom lifts. This engineering and safety engineering analysis demonstrates that the sudden conversion of energy on boom lifts can rapidly accelerate the operator platform and operator(s) within. Further, there are technologically feasible designs that protect operators against the sudden conversion of potential energy to kinetic energy on boom lifts. Such improved, safer designs are more effective at eliminating or reducing the frequency and severity of injuries than simply warning against the hazards.
APA, Harvard, Vancouver, ISO, and other styles
6

Yang, Shubo, and Xi Wang. "LPV Based Sliding Mode Control for Limit Protection of Aircraft Engines." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-77236.

Full text
Abstract:
Limit protection, which frequently exists as an auxiliary part in control systems, is not the primary motive of control but is a necessary guarantee of safety. As in the case of aircraft engine control, the main objective is to provide the desired thrust based on the position of the throttle; nevertheless, limit protection is indispensable to keep the engine operating within limits. There are plenty of candidates that can be applied to design the regulators for limit protection. PID control with gain-scheduling technique has been used for decades in the aerospace industry. This classic approach suggests linearizing the original nonlinear model at different power-level points, developing PID controllers correspondingly, and then scheduling the linear time-invariant (LTI) controllers according to system states. Sliding mode control (SMC) is well-known with mature theories and numerous successful applications. With the one-sided convergence property, SMC is especially suitable for limit protection tasks. In the case of aircraft engine control, SMC regulators have been developed to supplant traditional linear regulators, where SMC can strictly keep relevant outputs within their limits and improve the control performance. In aircraft engine control field, we all know that the plant is a nonlinear system. However, the present design of the sliding controller is carried out with linear models, which severely restricts the valid scope of the controller. Even if the gain scheduling technique is adopted, the stability of the whole systems cannot be theoretically proved. Research of linear parameter varying (LPV) system throws light on a class of nonlinear control problems. In present works, we propose a controller design method based on the LPV model to solve the engines control problem and achieve considerable effectiveness. In this paper, we discuss the design of a sliding controller for limit protection task of aircraft engines, the plant of which is described as an LPV system instead of LTI models. We define the sliding surface as tracking errors and, with the aid of vertex property, present the stability analysis of the closed-loop system on the sliding surface. An SMC law is designed to guarantee that the closed-loop system is globally attracted to the sliding surface. Hot day (ISA+30° C) takeoff simulations based on a reliable turbofan model are presented, which test the proposed method for temperature protection and verify its stability and effectiveness.
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography