Relevant bibliographies by topics / Impact forces

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Impact forces'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 September 2022

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Journal articles on the topic "Impact forces"

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McNair, P. "Impact forces and injury." Journal of Science and Medicine in Sport 9 (December 2006): 46. http://dx.doi.org/10.1016/j.jsams.2006.12.107.

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Nigg, Benno M. "Impact forces in running." Current Opinion in Orthopaedics 8, no. 6 (December 1997): 43–47. http://dx.doi.org/10.1097/00001433-199712000-00007.

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Grosso, Catherine, David Baldus, and George Woodworth. "The Impact of Civilian Aggravating Factors on the Military Death Penalty (1984-2005): Another Chapter in the Resistance of the Armed Forces to the Civilianization of Military Justice." University of Michigan Journal of Law Reform, no. 43.3 (2010): 569. http://dx.doi.org/10.36646/mjlr.43.3.impact.

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In 1984, the U.S. Armed Forces amended its capital punishment system for death eligible murder to bring it into compliance with Furman v. Georgia. Those amendments were modeled after death penalty legislation prevailing in over thirty states. After a brief period between 1986 and 1990, the charging decisions of commanders and the conviction and sentencing decisions of court martial members (jurors) transformed the military death penalty system into a dual system that treats two classes of death eligible murder quite differently. Since 1990, a member of the armed forces accused of a killing a commissioned officer or murder with a direct impact on the ability of military commanders to run an effective and disciplined military is significantly more likely to face a capital court martial and be sentenced to death than a similarly situated member accused of a murder connected to the military only fry the identity of the accused. This empirical study of charging and sentencing decisions in 104 death eligible military murders from 1984-2005 documents contemporary resistance to the civilianization of the military death penalty as manifest in charging and sentencing decisions. We conclude that a limitation of death eligible murder to those directly impacting military command and control could reduce the risk of arbitrariness in the administration of the military death penalty.
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Hossain, Mosharrof, and Muhammed Hasnain Kabir Nayeem. "SHAPE IMPACT ON AERODYNAMIC FORCES." International Journal of Engineering Applied Sciences and Technology 5, no. 1 (May 31, 2020): 85–91. http://dx.doi.org/10.33564/ijeast.2020.v05i01.012.

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Gilroy, Paul. "“Rhythm in the Force of Forces”." Critical Times 2, no. 3 (December 1, 2019): 370–95. http://dx.doi.org/10.1215/26410478-7862525.

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Abstract This essay is addressed to discrepancies between musical and political time. It uses the death of Hugh Masekela to consider the changing pattern of intergenerational relationships and the place of music within local and transnational freedom movements. The impact of technological change on the mediation of political solidarity is then examined through two principal examples: the elaboration of generic racial identity and the weaponization of culture and information by the alt-right and its fellow travelers.
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Vilayvong, K., N. Yasufuku, and R. Ishikura. "Evaluation of rainfall erosivity and impact forces using strain gauges." Lowland Technology International 17, no. 4 (2016): 207–17. http://dx.doi.org/10.14247/lti.17.4_207.

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Potthast, Wolfgang, Gert-Peter Brüggemann, Arne Lundberg, and Anton Arndt. "The Influences of Impact Interface, Muscle Activity, and Knee Angle on Impact Forces and Tibial and Femoral Accelerations Occurring after External Impacts." Journal of Applied Biomechanics 26, no. 1 (February 2010): 1–9. http://dx.doi.org/10.1123/jab.26.1.1.

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The purpose of this study was to quantify relative contributions of impact interface, muscle activity, and knee angle to the magnitudes of tibial and femoral accelerations occurring after external impacts. Impacts were initiated with a pneumatically driven impacter under the heels of four volunteers. Impact forces were quantified with a force sensor. Segmental accelerations were measured with bone mounted accelerometers. Experimental interventions were hard and soft shock interfaces, different knee angles (0°, 20°, 40° knee flexion), and muscular preactivation (0%, 30%, 60% of maximal voluntary contraction) of gastrocnemii, hamstrings, and quadriceps. Greater knee flexion led to lower impact forces and higher tibial accelerations. Increased muscular activation led to higher forces and lower tibial accelerations. The softer of the two shock interfaces under study reduced both parameters. The effects on accelerations and forces through the activation and knee angle changes were greater than the effect of interface variations. The hardness of the two shock interfaces explained less than 10% of the variance of accelerations and impact forces, whereas knee angle changes explained 25–29%, and preactivation changes explained 35–48% of the variances. It can be concluded that muscle force and knee joint angle have greater effects in comparison with interface hardness on the severity of shocks on the lower leg.
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Yeow, Chen Hua, Chee Hoong Cheong, Kian Siang Ng, V. S. Lee Peter, and C. H. Goh James. "TIBIAL CONTACT FORCES DURING IMPACT COMPRESSION OF THE KNEE JOINT(3E1 Sports & Impact Biomechanics I)." Proceedings of the Asian Pacific Conference on Biomechanics : emerging science and technology in biomechanics 2007.3 (2007): S237. http://dx.doi.org/10.1299/jsmeapbio.2007.3.s237.

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Haas, Trevor, Peter Dunaiski, and Philippe Maincon. "Evaluation of End Buffer Impact Forces." IABSE Symposium Report 96, no. 9 (January 1, 2009): 28–37. http://dx.doi.org/10.2749/222137809796078757.

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Nigg, Benno M., Gerald K. Cole, and Gert-Peter Brüggemann. "Impact Forces during Heel-Toe Running." Journal of Applied Biomechanics 11, no. 4 (November 1995): 407–32. http://dx.doi.org/10.1123/jab.11.4.407.

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Impact forces have been speculated to be associated with the development of musculoskeletal injuries. However, several findings indicate that the concepts of “impact forces” and the paradigms of their “cushioning” may not be well understood in relation to the etiology of running injuries and that complex mechanisms may be responsible for injury development during running. The purposes of this paper are (a) to review impact mechanics during locomotion, (b) to review injuries and changes of biological tissue due to impact loading, and (c) to synthesize the mechanical and biological findings. In addition, directions for future research are discussed. Future research should address the development of noninvasive techniques to assess changes in the morphology and biochemistry of bone, cartilage, tendon, and ligaments; researchers should also try to simulate impact loading during activities such as running, focusing on the interaction of the various loading parameters that determine the acceptable windows of loading for biological tissues.
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Dissertations / Theses on the topic "Impact forces"

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Haas, Trevor Neville. "Numerical (FEA) evaluation of crane end buffer impact forces." Thesis, Lilnk to the online version, 2007. http://hdl.handle.net/10019/633.

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Robertson, Erin Mhray. "Impact forces in female recreational runners track versus treadmill running /." Diss., Connect to online resource - MSU authorized users, 2008.

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Attumaly, Ashok Benjamin Basil. "A Wedge Impact Theory Used to Predict Bow Slamming Forces." ScholarWorks@UNO, 2013. http://scholarworks.uno.edu/td/1721.

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The pressures and impact forces acting on a hull while experiencing bow wave slamming is analyzed using Vorus' Impact Theory. The theory extends the hydrodynamic analysis of planing hulls from simple wedges to irregular shapes using a Boundary Element Method. A Fortran-based code developed by the Author is used to analyze hullforms. Linear strip theory is used to extend the analysis over a three dimensional hull. Post-processing of output data gives hull pressure distributions at different time steps and is visually presentable. Impact pressure, Impact force, Planing, Wave slamming, Bow impact, Vorus' theory, Boundary Element Method, Linear strip theory
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Arrhenius, Niklas B. "Ground Forces Impact on Release of Rotational Shot Put Technique." BYU ScholarsArchive, 2014. https://scholarsarchive.byu.edu/etd/4295.

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In the shot put throw, the primary power is generated in the form of ground reaction forces as a result of action of the lower extremities (Coh, Stuhec, & Supej, 2008). The purpose of this study was to determine how the ground reaction force and ground contact time during the delivery phase of rotational shot put relates to the predicted distance of the throw. This will allow us to determine the optimal approach of force application for maximum throwing distance (Linthorne, 2001). Eight male subjects were used in this study (age 23 ± 4 y; body mass 123 ± 14 kg; height 190 ± 4 cm; all right handed). Subjects threw three attempts in a custom-built shot put ring where two force plates were located where both feet were expected to land in the delivery. The throws were also filmed using two high-speed cameras at 120 frames/s. These videos gave us the speed, angle and height of release for predicting distance thrown. Results: Peak right leg force during delivery was correlated with throwing distance (R2 = 0.450, p = 0.001). Also, left leg ground time was significant with predicted throwing distance (R² = 0.516, p < 0.001). Because increased strength leads to greater throwing distances (Zaras et al., 2013) and peak right leg force was significant, it would be useful to perform proper strength training exercises that can increase a thrower's ability to increase the peak ground forces during a throw. If the thrower can produce greater peak force into the ground with the right leg during the delivery phase, this should cause the thrower to come off their left leg sooner, resulting in greater speed of release and thus distance thrown.
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MANGIATERRA, Marco. "Lubricants impact on cutting forces - Torque reduction in tapping process." Thesis, KTH, Industriell produktion, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-245178.

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Bearbetningsprocesser är en viktig del av tillverkningsindustrin. Dessa företag måste kontinuerligt förbättra sina processer och göra dem mer effektiva, minska de ekologiska fotavtrycken och driftskostnaderna. Syftet med denna rapport är att förbättra en rund brotschningsprocess för ett bilföretag. Brotschverktyget är tillverkat av solid HSS och belagt med TiN, som dras genom ett hål i arbetsstycket. På grund av att flera skärkanter fungerar samtidigt är skärkraften hög. Med skärverktygets lågavlastningsvinkel spelar smörjmedlet en kritisk roll i brotschningsprocessen. Arbetet studerar olika skärvätskor i ett laboratorium, genom att simulera påverkan av skärvätskor i en brotschningsprocess med tappningsoperationer under liknande förhållanden. Momentvärdena och beteendet av processen har studerats för de olika smörjmedlen. Studien visade att smörjmedlet har en stor påverkan på vridmoment och spånbildningen. Relationen mellan smörjviskositet och smörjningsförmåga studerades. Dessutom undersöktes sambandet mellan spånbildning och vridmomentbeteende, vilket visar vikten av spånens utrymningskapacitet. Processen har utförts genom att använda olika typer smörjmedel för att undersöka deras påverkan på skärkrafterna och hur de utvecklades under hela processen. Resultaten och den efterföljande analysen har visat att viskositeten har stort inflytande i processen. Viskositeten är omvänt proportionell mot vätskans kapacitet för att komma åt vissa kritiska områden, vilket ökar friktionskrafterna och genereringen av långa spån. Både spånstorleken och smörjmedlets förmåga att utrymma har starka influenser på processen.
Machining processes are an important part of the manufacturing industry. Companies within the manufacturing industry are required to continuously improve their processes and make them more efficient, to reduce the ecological impact and operational costs. The aim of this thesis is to be able to improve a circular broaching process for an automotive company. The broaching tool is made from solid High-Speed Steel and TiN coated, which is pulled through a hole in the workpiece. Due to multiple cutting edges acting simultaneously, the cutting force is high. With a low relief angle of the cutting tool and low cutting speed, the lubricant plays a critical role in the broaching process. The thesis studies different cutting fluids in a laboratory, by simulating the impact of cutting fluids in a broaching process with tapping operations under similar conditions. The torques values and the behaviour of it during the process have been recorded for different lubricants. The lubricants were found to have a strong influence in the torque required and the chip formation. The relation between lubricant viscosity and lubrication performance was studied. In addition, the relation between chip formation and torque behaviour was explored, showing the importance of chip evacuation capacity. The process has been carried out by using different lubricants to examine the required cutting forces and how they evolved throughout the process. The results and the consecutive analysis have shown an influence of the viscosity in the process. The viscosity is inversely proportional to the capacity of the fluid to access certain critical areas, increasing the friction forces and the generation of long chips. Both the chip size and the ability of the lubricant to evacuate have strong influences on the process.
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Lee, Youngjae. "Effects of Fall Technique Training on Impact Forces when Falling from Standing." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/89931.

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As falls and fall-related injuries are a major cause of injuries, the purpose of this study was to investigate whether, and to what extent, the stage combat fall technique training could reduce the impact forces of falls from standing. Twenty-six healthy young adults (14 males and 12 females) participated in our study, and were randomly assigned to either a training group or non-training (control) group. Both groups completed a pre-intervention and a post-intervention fall testing session, separated by two weeks, in which they performed naturalistic falls. The training group performed identical pre-intervention fall testing as the control group, and was then required to receive four 1-hour training sessions in the course of two weeks, led by a certified stage combat fall technique training instructor. The training group then completed a post-intervention fall testing session where they performed naturalistic falls and also falls using the fall technique they learned. Falls were induced in both forward and backward directions using a tether-release protocol. Differences between control and training groups at pre-training, and group differences in the change in dependent measures with training, were examined using Mann-Whitney U tests. The results showed that, following stage-combat fall training, the training group exhibited 32% and 35% reduction in median impact forces for forward and backward falls respectively, while the control group exhibited 5% and 2% reductions (p = 0.002 and <0.001). In addition, the training group showed shorter backward fall duration as well as longer impact time, larger impulse, and longer or larger center-of-pressure based measures for both directions of falling than the control group. However, training was not associated with reduced impact force during the naturalistic falls of the training group. To our knowledge, this was the first study to investigate the stage combat fall technique training and demonstrate its effectiveness as an intervention to reduce impact forces of falls, thereby exploring the potential to reduce the number of fall-related injuries. While these falls were induced from standing, whether these results would transfer to an unanticipated fall while walking due to a slip/trip remain to be explored.
Master of Science
As falls and fall-related injuries are a major cause of injuries, the purpose of this study was to investigate whether, and to what extent, the stage combat fall technique training could reduce the impact forces of falls from standing. Twenty-six healthy young adults (14 males and 12 females) participated in our study, and were randomly assigned to either a training group or non-training (control) group. Both groups completed a pre-intervention and a post-intervention fall testing session, separated by two weeks, in which they performed naturalistic falls. The training group was required to receive four 1-hour training sessions in the two-week intervention period, led by a certified stage combat fall technique training instructor. The training group then completed a post-intervention fall testing session where they performed naturalistic falls and also falls using the fall technique they learned. The results showed that, following stage-combat fall training, the training group exhibited nearly a 1/3rd reduction in impact forces for both forward and backward falls, while the control group only exhibited 5% and 2% reductions respectively. Our analysis also showed that the training group achieved this reduction in impact force by increasing the impact time and spreading out their bodies more, to distribute the impact over a larger area. To our knowledge, this was the first study to investigate the stage combat fall technique training and demonstrate its effectiveness as an intervention to reduce impact forces of falls, thereby exploring the potential to reduce the number of fall-related injuries.
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Pang, Tao, and tony_pang@hotmail com. "Studies on Wheel/Rail Contact – Impact Forces at Insulated Rail Joints." Central Queensland University. Centre for Railway Engineering, 2008. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20080410.154708.

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To investigate the wheel/rail contact impact forces at insulated rail joints (IRJs), a three-dimensional finite element model and strain gauged experiments are employed and reported in this thesis. The 3D wheel/rail contact-impact FE model adopts a two-stage analysis strategy in which the wheel-IRJ railhead contact is first established in the static analysis and the results transferred to dynamic analysis for impact simulations. The explicit FE method was employed in the dynamic analysis. The Lagrange Multiplier method and the Penalty method for contact constraint enforcement were adopted for the static and dynamic analyses respectively. The wheel/rail contact-impact in the vicinity of the end post is exhibited via numerical examples from the FE modelling. The wheel/rail contact impact mechanism is investigated. The strain gauged experiments which consist of a lab test and a field test are reported. The signature of the strain time series from the field test demonstrates a plausible record of the dynamic responses due to the wheel/rail contact impact. By using the experimental data, both the static and the dynamic FE models are validated. It is found that the stiffness discontinuity of the IRJ structure causes a running surface geometry discontinuity during the wheel passages which then causes the impact in the vicinity of the end post. Through a series of sensitivity studies of several IRJ design parameters, it is shown that the IRJ performance can be effectively improved with optimised design parameters.
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Preston, James Franklin. "Technology's impact on student understanding and retention of motion and forces." Diss., Connect to online resource - MSU authorized users, 2008.

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Thesis (M.S.)--Michigan State University. Interdepartmental Physical Science, 2008.
Title from PDF t.p. (viewed on July 28, 2009) Includes bibliographical references (p. 87-89). Also issued in print.
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Dohy, Jennifer Marie. "The Impact of School Policing Practices on Student Behaviors in Ohio Public Schools." Cleveland State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=csu1463267974.

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Wilcox, Sylvia Joan. "Ground Reaction Forces Generated by Twenty-eight Common Hatha Yoga Postures." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2306.

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Yoga adherents claim many benefits of the practice, including promotion of bone health and prevention of osteoporosis. However, few, if any, studies have investigated whether yoga enhances bone mineral density. Furthermore, none have identified force generation in yoga. The purpose of this study is to collect ground reaction force (GRF) data on a variety of common hatha yoga postures that would be practiced in fitness centers or private studios. Twelve female and eight male volunteers performed a sequence of 28 common hatha yoga postures while ground reaction force data were collected with an AMTI strain-gauge force plate. The sequence was repeated six times. Four variables were studied: the maximum vertical GRF, the mean vertical GRF, the maximum resultant GRF, and the mean resultant GRF. Univariate analysis was used to identify mean values and standard deviations for each of the four variables. Multivariate analysis revealed some variation due to gender but none due to age or weight. Means were similar across all poses and subjects, and standard deviations were small. This unique yoga sequence produced low impact forces in both upper and lower extremities. Further research is warranted to determine whether these forces are sufficient to promote osteogenesis or maintain current bone health in yoga practitioners.
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Books on the topic "Impact forces"

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Schirmer, Heike. Combined Forces for Social Impact. Wiesbaden: Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-04859-4.

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The impact of US forces in Korea. Washington, D.C: National Defense University Press, 1987.

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Hexter, Holly. Joining forces: The military's impact on college enrollments. Washington, DC: American Council on Education, 1988.

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Banerjee, S. Induction of women in the central police forces: Their impact on the forces. New Delhi: Institute of Social Sciences, 2012.

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Landau, Daniel L. The economic impact of military expenditures. Washington, DC (1818 H St., NW, Washington 20433): Policy Research Dept. Word Bank, 1993.

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Parola, Arthur C. Debris forces on highway bridges. Washington, D.C: National Academy Press, 2000.

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1968-, Grant Heather McLeod, ed. Forces for good: The six practices of high-impact nonprofits. Hoboken, NJ: Jossey-Bass, 2012.

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Crutchfield, Leslie R. Forces for good: The six practices of high-impact nonprofits. Hoboken, NJ: Jossey-Bass, 2012.

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Crutchfield, Leslie R. Forces for good: The six practices of high-impact nonprofits. San Francisco: Jossey-Bass, 2008.

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A, Phillips Thomas, and Lowe Donald F, eds. Remediation of firing range impact berms. Boca Raton, Fla: Lewis Publishers, 2000.

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Book chapters on the topic "Impact forces"

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Ventresca, Matt, and Mary G. McDonald. "Forces of Impact." In Sociocultural Examinations of Sports Concussions, 3–20. New York : Routledge, 2019. | Series: Routledge research in sport and exercise science: Routledge, 2019. http://dx.doi.org/10.4324/9780429028175-1.

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Schirmer, Heike. "Theoretical Frameworks." In Combined Forces for Social Impact, 75–98. Wiesbaden: Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-04859-4_3.

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Schirmer, Heike. "Introduction." In Combined Forces for Social Impact, 15–21. Wiesbaden: Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-04859-4_1.

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Schirmer, Heike. "Relevant Fundamentals." In Combined Forces for Social Impact, 23–74. Wiesbaden: Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-04859-4_2.

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Schirmer, Heike. "Research Methodology." In Combined Forces for Social Impact, 99–118. Wiesbaden: Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-04859-4_4.

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Schirmer, Heike. "Description of Case Studies." In Combined Forces for Social Impact, 119–36. Wiesbaden: Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-04859-4_5.

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Schirmer, Heike. "Results of Analysis and Interpretations." In Combined Forces for Social Impact, 137–200. Wiesbaden: Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-04859-4_6.

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Schirmer, Heike. "Conclusion and Outlook." In Combined Forces for Social Impact, 201–10. Wiesbaden: Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-04859-4_7.

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Pressman, Steven. "Introduction." In How Social Forces Impact the Economy, 1–14. 1 Edition. | New York : Routledge, 2020. | Series: Routledge advances in social economics: Routledge, 2020. http://dx.doi.org/10.4324/9781003006343-1.

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Di Tommaso, Marco R., Mattia Tassinari, and Andrea Ferrannini. "Industrial policy and societal goals." In How Social Forces Impact the Economy, 137–65. 1 Edition. | New York : Routledge, 2020. | Series: Routledge advances in social economics: Routledge, 2020. http://dx.doi.org/10.4324/9781003006343-11.

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Conference papers on the topic "Impact forces"

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Zhang, Zu Guang, Toshiyuki Ueno, and Toshiro Higuchi. "Magnetostrictive actuating device utilizing impact forces coupled with friction forces." In 2010 IEEE International Symposium on Industrial Electronics (ISIE 2010). IEEE, 2010. http://dx.doi.org/10.1109/isie.2010.5637678.

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Markova, Jana, and Karel Jung. "Assessment of impact forces in standards." In 2015 International Conference on Military Technologies (ICMT). IEEE, 2015. http://dx.doi.org/10.1109/miltechs.2015.7153757.

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Grilli, Stéphan T., Miguel A. Losada, and Francisco Martin. "Wave Impact Forces on Mixed Breakwaters." In 23rd International Conference on Coastal Engineering. New York, NY: American Society of Civil Engineers, 1993. http://dx.doi.org/10.1061/9780872629332.088.

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Reissell, L.-M., and Dinesh K. Pai. "High Resolution Analysis of Impact Sounds and Forces." In Second Joint EuroHaptics Conference and Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems (WHC'07). IEEE, 2007. http://dx.doi.org/10.1109/whc.2007.70.

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Bowling, Alan. "Impact forces and mobility in legged robot locomotion." In 2007 IEEE/ASME international conference on advanced intelligent mechatronics. IEEE, 2007. http://dx.doi.org/10.1109/aim.2007.4412406.

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Gramann, Pratibha. "The Impact of Cosmic Forces on Human Mind." In DIALOGO-CONF 2019. Dialogo, 2019. http://dx.doi.org/10.18638/dialogo.2019.6.1.32.

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Udofa, Andrew B., Laurence J. Ryan, and Peter G. Weyand. "Impact forces during running: Loaded questions, sensible outcomes." In 2016 IEEE 13th International Conference on Wearable and Implantable Body Sensor Networks (BSN). IEEE, 2016. http://dx.doi.org/10.1109/bsn.2016.7516290.

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Liu, Jun, and Jianlong Tian. "Impact Forces of Submarine Landslides on Free-Span Pipelines." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24346.

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Submarine landslides are perhaps the most significant geohazard on the deep water oil and gas developments, especially on the pipelines. The impacted forces of submarine landslides on pipelines are usually expressed in terms of drag factors within a fluid mechanics framework. The drag factors mainly depend on an equivalent Reynolds number for the non-Newtonian debris material. In this paper, Computational Fluid Dynamics (CFD) numerical analysis was employed to analyze the impact forces of submarine landslides on free span pipelines. In these numerical simulations, influences on impact forces of debris material composition, attack angles and velocity of debris flow were discussed in detail. Based on the simulation results we find that the impact angle also has apparent influence on normal drag factors, but has little influence on longitudinal drag factors. Prediction formula are improved to better estimate normal and axial impact forces on pipelines at any attack angle within the fluid mechanics framework.
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INDRARATHNE, P. K. G., K. A. T. O. RANADEWA, and V. G. SHANIKA. "IMPACT OF COMPETITIVE FORCES TO THE CONTRACTORS IN SRI LANKA: AN INDUSTRY ANALYSIS USING PORTER’S FIVE FORCES." In 13th International Research Conference - FARU 2020. Faculty of Architecture Research Unit (FARU), University of Moratuwa, 2020. http://dx.doi.org/10.31705/faru.2020.21.

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The nature of the business environment is very complex in the construction industry. Huge capital investment, supply chain management, resource scarcity and uncertainty create a multifaceted background along with impressive external environmental impacts. Thus, contracting organizations are highly influenced by the competitive nature of the construction industry. Hence identifying the impact of competitive forces to the contractors in Sri Lanka is identified as vital. Besides, Porter’s five competitive forces model is grounded to interpret the competition through external environment and it denotes that there are five forces which can affect to the competition of an industry; new entrants, suppliers, buyers, substitutes and the existing competitors. Thus, the research leads to examine the impact of competitive forces to the contractors in Sri Lanka using a comprehensive Porter’s Five Forces analysis. The research employs a quantitative approach consisting of preliminary survey of experts and questionnaire survey with the participation of construction experts in Sri Lanka. In order to analyse the collected data, statistical tools such as RII method and measurements of central tendency were employed. The results of the analysis elicited 28 significant factors that determine the power of the five competitive forces on local contractors. Accordingly, the final outlined Porter’s five forces analysis matrix enables the contractors to analyse the impact of each competitive force through identified determinant factors which would provide a proper guidance on determining necessary offensive or defensive strategies to be taken to survive in the market.
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Hagesteijn, G., J. Brouwer, and R. Bosman. "Development of a Six-Component Blade Load Measurement Test Setup for Propeller-Ice Impact." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-84192.

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The impact of ice on a propeller is a complex process, which most likely results into a milling or crushing process, or a combination. The highly dynamic forces during an impact can change rapidly in amplitude as well as direction. Little information can be deducted from classic test setups with rigid propellers, especially forces on the individual blades are seldom successfully measured. The presented paper will outline the challenges which need to be overcome to measure these impacts more accurately and elaborate on a measurement setup which has proven to capture the impact loads of actual ice impacts in great detail. Classic designs for propeller testing involve rigid propellers with force measurements located at the base of the propeller. From this type of setup, immediately two problems arise. First of all, when impacting relatively large ice blocks, it will be hard to derive which part of the measured forces contributes to one blade and which part to the other. Secondly, in practical test situations the natural frequency of the entire propeller mounted on a force transducer can be relatively low. Impacts are suspected to contain forces with high frequency components, causing the entire propeller assembly to vibrate and thereby obscuring a correct measurement of the impact loads. A measurement setup has been designed to overcome both problems. Rather than measuring the forces on a complete propeller, only a single blade is mounted on a force transducer. This particular transducer is capable of measuring forces in x-, y- and z-directions as well as moments around the x-, y- and z-axis. The other propeller blades are mounted directly on the shaft drive. This measurement setup reduces the first problem, any impact visible in the measurements signals are solely due to forces on the instrumented ‘key-blade’.
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Reports on the topic "Impact forces"

1

Lee, Suk B. The Impact of US Forces in Korea. Fort Belvoir, VA: Defense Technical Information Center, January 1987. http://dx.doi.org/10.21236/ada187932.

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Staats, Grant S. The Reserve Forces Impact on Theater Security Cooperation. Fort Belvoir, VA: Defense Technical Information Center, March 2013. http://dx.doi.org/10.21236/ada590301.

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Fullerton, Anne M., Ann Marie Powers, Don C. Walker, and Susan Brewton. The Distribution of Breaking and Non-Breaking Wave Impact Forces. Fort Belvoir, VA: Defense Technical Information Center, March 2009. http://dx.doi.org/10.21236/ada495574.

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Dovchinsuren, Ganzorig. Mongolia's Third Neighbor Policy: Impact on the Mongolian Armed Forces. Fort Belvoir, VA: Defense Technical Information Center, March 2012. http://dx.doi.org/10.21236/ada561642.

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Styles, Richard, Rachel Bain, and Anthony Priestas. Method to evaluate vessel wake forces on wetland scarps. Engineer Research and Development Center (U.S.), September 2022. http://dx.doi.org/10.21079/11681/45304.

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This Coastal and Hydraulics engineering technical note (CHETN) presents a methodology to compute normal forces on wetland perimeters with vertically scarped edges. The approach uses an empirical algorithm that predicts the normal force given the offshore vessel wake height, period, and water depth at a given point. Wave impact forces are measured using load cells, which have not been applied previously to marsh settings. Load cell and vessel wake measurements from two field sites are combined to generate an empirical transfer function relating forces to incoming vessel wake characteristics.
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Kilcullen, Robert, and James Lussier. The Impact of Extending the Special Forces Warrant Officer Service Obligation on the Recruitment and Accessioning of Special Forces Warrant Officers. Fort Belvoir, VA: Defense Technical Information Center, January 2009. http://dx.doi.org/10.21236/ada495035.

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Beck, Richard R. Training Tomorrow's Navy: The Impact of Joint Vision 2010 on Training Naval Forces. Fort Belvoir, VA: Defense Technical Information Center, February 1997. http://dx.doi.org/10.21236/ada325148.

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O'Shea, Thomas T., Kyle A. Brucker, Donald Wyatt, Douglas G. Dommermuth, Jonathan Ward, Sheguang Zhang, Kenneth Weems, Woei-Min Lin, Carolyn Judge, and Allen Engle. Validation of Numerical Predictions of the Impact Forces and Hydrodynamics of a Deep-V Planing Hull. Fort Belvoir, VA: Defense Technical Information Center, December 2012. http://dx.doi.org/10.21236/ada571594.

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Cockrill, Jennifer A., Annette M. Von Thun, Mark Fukuda, Jason Maguire, William Padgett, Cynthia Wilkerson, Paul Mann, Laura Pacha, Mary Vaeth, and Lou Jasper. Optimizing Preventive Strategies and Malaria Diagnostics to Reduce the Impact of Malaria on US Military Forces. Fort Belvoir, VA: Defense Technical Information Center, May 2012. http://dx.doi.org/10.21236/ada582621.

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Riley, Michael N. Untrained and Unavailable: The Impact of Operations Other Than War (OOTW) On Forces Destined to Support Combat CINC's. Fort Belvoir, VA: Defense Technical Information Center, May 2000. http://dx.doi.org/10.21236/ada381732.

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