Gotowe bibliografie tematyczne / Third Order Rotatable Designs

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Gotowa bibliografia na temat „Third Order Rotatable Designs”

Autor: Grafiati

Data publikacji: 8 września 2023

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Artykuły w czasopismach na temat "Third Order Rotatable Designs"

Draper, Norman R., Berthold Heiligers i Friedrich Pukelsheim. "On optimal third order rotatable designs". Annals of the Institute of Statistical Mathematics 48, nr 2 (czerwiec 1996): 395–402. http://dx.doi.org/10.1007/bf00054798.

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Shareef, R. Md Mastan. "A note on Variance-Sum Third Order Slope Rotatable Designs". International Journal for Research in Applied Science and Engineering Technology 9, nr 10 (31.10.2021): 760–66. http://dx.doi.org/10.22214/ijraset.2021.38512.

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Abstract: Response Surface Methodology (RSM) is a collection of mathematical and statistical techniques useful for analyzing experiments where the yield is believed to be influenced by one or more controllable factors. Box and Hunter (1957) introduced rotatable designs in order to explore the response surfaces. The analogue of Box-Hunter rotatability criterion is a requirement that the variance of i yˆ(x)/ x be constant on circles (v=2), spheres (v=3) or hyperspheres (v 4) at the design origin. These estimates of the derivatives would then be equally reliable for all points (x , x ,...,x ) 1 2 v equidistant from the design origin. This property is called as slope rotatability (Hader and Park (1978)).Anjaneyulu et al (1995 &2000) introduced Third Order Slope Rotatable Designs. Anjaneyulu et al(2004) introduced and established that TOSRD(OAD) has the additional interesting property that the sum of the variance of estimates of slopes in all axial directions at any point is a function of the distance of the point from the design origin. In this paper we made an attempt to construct Variance-Sum Third Order Slope Rotatable in four levels. Keywords: Response Surface Methodology. Third Order Slope Rotatable Design; TOSRD (OAD), Variance-Sum Third Order Slope Rotatable Design.

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Babu, P. Seshu, i A. V. Dattatreya Rao. "ON THIRD ORDER SLOPE ROTATABLE DESIGNS USING PAIRWISE BALANCED DESIGNS". Far East Journal of Theoretical Statistics 63, nr 1 (10.11.2021): 29–37. http://dx.doi.org/10.17654/ts063010029.

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Guravaiah, B. "Construction of Variance-Sum Third Order Slope Rotatable Designs". International Journal for Research in Applied Science and Engineering Technology 9, nr 3 (31.03.2021): 1075–83. http://dx.doi.org/10.22214/ijraset.2021.33422.

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Rotich, Jeremy, Mathew Kosgei i Gregory Kerich. "Optimal Third Order Rotatable Designs Constructed from Balanced Incomplete Block Design (BIBD)". Current Journal of Applied Science and Technology 22, nr 3 (14.07.2017): 1–5. http://dx.doi.org/10.9734/cjast/2017/34937.

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Omwando Cornelious, Nyakundi, i Evans Mbuthi Kilonzo. "Optimal Sequential Third Order Rotatable Designs in Three, Four and Five Dimensions". International Journal of Systems Science and Applied Mathematics 6, nr 2 (2021): 35. http://dx.doi.org/10.11648/j.ijssam.20210602.11.

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Moore, Ronald W., K. M. Eskridge, P. E. Read i T. P. Riordan. "OPTIMIZING CALLUS INITIATION USING STOLON NODAL SEGMENTS OF BUFFALOGRASS NE84-609 AND A RESPONSE SURFACE DESIGN". HortScience 26, nr 6 (czerwiec 1991): 766C—766. http://dx.doi.org/10.21273/hortsci.26.6.766c.

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The concept that greater callus mass will induce competence was investigated. The second most immature nodal segments were removed from heavily fertigatcd greenhouse grown plants. Shoots initiated from those nodes were only cut back to one-third their total length. They were subjected to the following treatments: (1) dicamba from 1μM to 5μM in increments of 1.0; (2) B5 medium salt concentrations from 1/3x to 5/3x in increments of 1/3; (3) sucrose levels from 2% to 10% in increments of 2; (4) casein hydrolysate from 0 to 200mg/l in increments of 50. The experiment consisted of twenty-five different treatment combinations in a central composite rotatable second order design. Explants were placed in continuous cool white fluorescent light at 26°C. Dicamba, B5 salts, and sucrose had significant effects on callus mass (p<.12), while casein hydrolysate had no notable effects on callus mass (p ≥ .57). It was determined that optimum response occurred at 5/3x concentration of B5 salts, 10% sucrose, and 5.0μM dicamba. White, compact calli were observed in treatment combinations that yielded callus fresh weights of two-hundred milligrams or higher.

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H. sulaymon, Abbas, Abdul-Rezzak H.A l-Karaghouli i Sattar I. Ghulam. "Concentration of Hydrogen Peroxide by Batch Distillation Column". Iraqi Journal of Chemical and Petroleum Engineering 8, nr 3 (30.09.2007): 13–18. http://dx.doi.org/10.31699/ijcpe.2007.3.3.

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An investigation was conducted to study the concentration of hydrogen peroxide by vacuum distillation. The effect of the process variables (such as vacuum pressure, reflux ratio, time of distillation, and packing height of the column used in the distillation process) on the concentration of hydrogen peroxide were investigated. During the third stage of distillation (95 wt.%) concentration was obtained. Box-Wilson central composite rotatable design is used to design the experimental work for the mentioned variables. It was found that the concentration of hydrogen peroxide increases with Increasing vacuum pressure, decreasing reflux ratio, increasing the time of distillation and increasing the packing height. The second order polynomial regression analysis of the objective response (concentration of hydrogen peroxide). with respect to the four variable, using statistical program gave the following equations: Y1 = 54.87 - 0.27 P - 81.45 R .+ 16.36 t + 0.69 H + 55.67 R2 - 0.0035 H2 Y2 = 104.04 - 0.44 P - 140.62 R + 19.8 t + 0.211 H + 0.0018 P+ 105.25 R2-3.33 r Y3 = 83.79 - 0.18 P - I 9.04 R + I J.14 t - 0.094 H - 0.0047 P 2 - 26.78 R2 - 2.78 t2

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Mukerjee, Rahul. "On fourth order rotatable designs". Communications in Statistics - Theory and Methods 16, nr 6 (styczeń 1987): 1697–702. http://dx.doi.org/10.1080/03610928708829463.

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Das, Rabindra Nath. "Robust Second Order Rotatable Designs : Part I". Calcutta Statistical Association Bulletin 47, nr 3-4 (wrzesień 1997): 199–214. http://dx.doi.org/10.1177/0008068319970306.

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In Panda and Das ( Cal. Statist. Assoc. Bull., 44, 1994, 83-101) a study of rotatable designs with correlated errors was initiated and a systematic study of first order rotatable designs was attempted. Various correlated structures of the errors were considered. This two-part article relates to a thorough study on robust second order rotatable designs (SORD's) under violation of the usual homoscedasticity assumption of the distribution of errors. Under a suitable autocorrelated structure of the dispersion matrix of the error components, we examine existence and construction of robust rotatable designs. In part I, general conditions for rotatability have been derived and special cases have been examined under autocorrelated structure of the errors. Starting with the usual SORD's (under the uncorrelated error setup), we have discussed a method of construction of SORD's with correlated errors under the autocorrelated structure. An illustrative example is given at the end. In part II,we propose to examine robustness of the usual SORD's with emphasis on properties such as weak rotatability, with due consideration as to the cost involved.

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Rozprawy doktorskie na temat "Third Order Rotatable Designs"

Sanders, Elizabeth Rose. "Minimum bias estimation for first and second order rotatable response surface designs". 1986. http://catalog.hathitrust.org/api/volumes/oclc/13908764.html.

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Thesis (Ph. D.)--University of Wisconsin--Madison, 1986.
Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 131-136).

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Książki na temat "Third Order Rotatable Designs"

Emlyn, Henry. A Proposition for a New Order in Architecture, with Rules for Drawing the Several Parts. with Two Original Designs of This Composition the Third Edition. Gale Ecco, Print Editions, 2018.

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Części książek na temat "Third Order Rotatable Designs"

Kishida, Hideo, i Hiroshi Okamoto. "Third-Order Optical Nonlinearity of Halogen-Bridged Nickel(III) Compounds". W Material Designs and New Physical Properties in MX- and MMX-Chain Compounds, 93–109. Vienna: Springer Vienna, 2012. http://dx.doi.org/10.1007/978-3-7091-1317-2_7.

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"OPTIMAL ROBUST SECOND-ORDER SLOPE ROTATABLE DESIGNS". W Robust Response Surfaces, Regression, and Positive Data Analyses, 125–42. Chapman and Hall/CRC, 2014. http://dx.doi.org/10.1201/b16899-8.

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Kukkonen, Karin. "Intertextual Precision Expectations". W Probability Designs, 107–16. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190050955.003.0009.

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In the chapters that follow, the third-order probability design is developed. The third-order probability design revolves around how expectations about second- and first-order predictions are developed through structural patterns yielded by genre (III.1), textual gaps and shadow stories (III.2), and intertextual references to unfamiliar texts (III.3). The final chapter of the section, then, traces the tension between flexibility and constraint in probability designs.

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Kukkonen, Karin. "Reading by Proxy". W Probability Designs, 126–33. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190050955.003.0011.

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The chapter addresses how unfamiliar references can do important interpretive work in the third-order probability design. It begins with the observation that readers often do not need to have read the texts that characters read or hold in their libraries to nevertheless get a clear sense of what kind of precision expectation these references provide. The process of discerning what predictions are likely to be relevant without the necessary textual knowledge is introduced as ‘reading by proxy’. It is supported by the text’s probability design. The chapter goes on to discuss the implications of reading by proxy for the analysis of texts from a different historical period and relates predictive processing to schema theory.

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Brousseau, Eric, i Jean-Michel Glachant. "Postscript". W The Oxford Handbook of Institutions of International Economic Governance and Market Regulation, C44S1—C44N5. Oxford University Press, 2023. http://dx.doi.org/10.1093/oxfordhb/9780190900571.013.44.

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Abstract The contributions to this handbook are embracing an actor-centric and dynamic perspective to approach the way the transnational economic order is shaped. They highlight a set of dialectical relationships among alternative patterns of economic governance. First comes the opposition between market and hierarchy. Second is the articulation between private and public governance. Third comes the interplay between regulation and enforcement. Fourth is the contrast between decentralized and centralized adjustment processes. The articulation between organization-supported and interpersonal-network-based governance is the fifth one highlighted. Sixth, the long-term persistence of local pragmatic designs is highlighted. Lastly, the standard hierarchy of norms and authorities is contrasted with a more “biological” approach in which governance insists on the multiple levels and principles of regulation of a complex ecosystem.

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"The Ecology and Management of Wood in World Rivers". W The Ecology and Management of Wood in World Rivers, redaktorzy MICHAEL REICH, JEFFREY L. KERSHNER i RANDALL C. WILDMAN. American Fisheries Society, 2003. http://dx.doi.org/10.47886/9781888569568.ch19.

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<em>Abstract.</em>—The use of large wood in stream restoration projects has become increasingly popular in the last 20 years. We reviewed more than 30 case studies from different ecoregions and countries (Canada, Germany, Japan, United States) to evaluate the variety of approaches used and assessed their reported success. Wood inputs generally fell into two categories: fixed structural designs or placements where wood was not fixed to one location. Large wood was used in fixed designs in most studies from North America and usually built in or anchored by cables. Few projects attempted to simulate the dynamic processes of wood inputs to the floodplain. Mobile wood placements were mostly used in projects after 1990. They represented 6% of the projects in North America and 55% in Germany, where restoration projects designed with mobile wood can be found even in densely populated (200 people/km<sup>²</sup>) rural areas, but only along second- and third-order streams. Few studies attempted to simulate historical amounts and distribution of wood in forested catchments. In most of the studies from rural areas, practical aspects like stream access or the availability of logs dominated the experimental design and placements.

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"Setting Up an Online Survey Instrument for Effective Quantitative Cross-Tabulation Analysis". W Advances in Data Mining and Database Management, 17–29. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-8563-3.ch002.

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The building of an online survey instrument involves sophisticated understandings of the research context, research design, research questions, and other elements. A lesser observed need is to consider what types of data analytics will be applied to the findings. With beginning-to-end online survey research suites, it becomes all the more necessary to think through the process from beginning to end in order to create an instrument that achieves all the necessary aims of the research. After all, improper online survey instrument designs will result in makework when it comes time to analyze data and will foreclose on particular data analytics opportunities. (Such instruments also will not have second or third uses after the first one-off.) This chapter explores how to build an effective online survey instrument to enable a quantitative cross tabulation analysis with the built-in analysis Qualtrics.

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Waters, Keith. "Chick Corea". W Postbop Jazz in the 1960s, 85–120. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190604578.003.0004.

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Chick Corea’s prolific compositional career began in the 1960s, even if he likely went on to greater acclaim in the 1970s with compositions such as “La Fiesta” and “Crystal Silence.” “Windows” (Inner Space) uses ascending perfect fifth progressions as a large-scale harmonic frame for the composition, although harmonic substitutions expand that frame, and the skeletal melody (often appearing on metrical downbeats) creates longer underlying lines. A comparison of the recording with Corea’s copyright deposit shows a degree of evolution in the composition, particularly through harmonic inversions and stepwise bass motion. “Inner Space” (Inner Space) uses a melodic major third axis progression (in the introduction and later in the composition), but particular harmonic substitutions suggest a second-order grammar in which the progressions do not shadow the melodic axis. As with many Corea compositions from the 1960s, a centrifugal harmonic progression closes with an expanded harmonic turnaround to return to the m. 1 harmony. Three versions of “Song of the Wind” (Complete “Is” Sessions, Joe Farrell Quartet, Piano Improvisations vol. 1) illustrate Corea’s move to a more complex harmonic language, using polychords and expanded pedal points. Despite stark differences between the more progressive harmonic language of “Song of the Wind” and his earlier “Windows,” a comparison of the melodic designs of both jazz waltzes indicates some overall structural similarities.

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Mostafa, Asif. "Safety and Risk Assessment of Civil Aircraft during Operation". W Safety and Risk Assessment of Civil Aircraft during Operation. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.93326.

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Risk and safety are always considered to be the most critical operational characteristics of civil aircraft. Typically, they relate to the possible occurrence of air traffic collisions that could result in loss of life, damage to infrastructure, and damage to property by third parties. Consequently, in addition to other adverse effects such as noise, air pollution, they were deemed externalities. Risk and protection became topics of continuous study, ranging from purely technical/technological aspects to explicitly administrative ones, due to their inherent very high importance. Such concerns require the establishment of appropriate regulations regarding designs and operations of device technology. In order assess the risk, there are several methods which include: identification of safety concerns, analysis of the risk factors likelihood, analysis of the risk factors severity, and assessment and the admissibility of risk factors. And finally, reducing of the risk should be performed by three general strategies which are: avoidance of the risk, reduction of risk, and isolation of the exposure. These strategies are implemented based on efficiency, technical measures, controlled measures, staffing measures, cost/benefit, practicality, acceptability of each party, durability, residual risk factor for flights safety, and new challenges. With the advancement of technology, new methods of risk deduction and safety concerns are being developed to ensure safe and risk-free flight operation.

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Athanasopoulos, Michael, Kostas Kontogiannis i Chris Brealey. "Considerations of Adapting Service-Offering Components to RESTful Architectures". W Enterprise Resource Planning, 1522–49. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-4153-2.ch081.

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Over the past few years, we have witnessed a paradigm shift on the programming models and on architectural styles, which have been used to design and implement large-scale service-oriented systems. More specifically, the classic message-oriented and remote procedure call paradigm has gradually evolved to the resource-oriented architectural style, inspired by concepts pertinent to the World Wide Web. This shift has been primarily driven by multifaceted functional and non-functional requirements of Web enabled large-scale service offering systems. These requirements include enhanced interoperability, lightweight integration, scalability, enhanced performance, even looser coupling, and less dependence on shifting technology standards. As a consequence, several, and sometimes antagonistic, architectures, design patterns, and programming paradigms have emerged on a quest to overcome the constantly expanding enterprise software needs. In the context of resource-oriented architectures, the Representational State Transfer (REST) architectural style has gained considerable attention due to its simplicity, uniformity, and flexibility. More specifically, the potential for scalability and loose coupling, the uniformity of interfaces, and the efficient bridging of enterprise software systems with the Web are significant factors for software architects and engineers to consider REST when designing, implementing, composing, and deploying service-oriented systems. These issues stir discussion among academics and practitioners about how to properly apply REST constraints both with respect to the development of new enterprise systems and to the migration and adaptation of existing service-oriented systems to RESTful architectures. In this chapter, the authors discuss issues and challenges related to the adaptation of existing service-oriented systems to a RESTful architecture. First, they present the motivation behind such an adaptation need. Second, the authors discuss related adaptation theory, techniques, and challenges that have been recently presented in the research literature. Third, they identify and present several considerations and dimensions that the adaptation to REST entails, and the authors present frameworks to assess resource-oriented designs with regard to compliance to REST. Fourth, the authors introduce an adaptation framework process model in the context of enterprise computing systems and technologies, such as Model Driven Engineering and Service Component Architecture (SCA). Furthermore, they discuss open challenges and considerations on how such an adaptation process to REST can be extended, in order to yield systems that best conform to the REST architectural style and the corresponding REST constraints. Finally, the chapter is concluded with a summary and a discussion on the points raised and on some emerging trends in this area.

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Streszczenia konferencji na temat "Third Order Rotatable Designs"

Ahmed, Khaled I., Abobakr Almashhor i Mohamed H. Ahmed. "Simulation-Based Correlation for Saved Energy in Ground Source Heat Exchangers for Middle East Region". W ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-66381.

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Abstract Shallow geothermal energy is a renewable energy source used to reduce electric demand to produce cooling and heating of buildings. The temperature at a specific ground level is constant year-round depends on the geographic region. It can be utilized by exchanging heat in the hot weather (cooling) or cold weather (heating) using Ground Source Heat Exchangers GSHE. Many attempts have been proposed to investigate the GSHE controlling factors with a lack of interconnection effects of mutual inclusive parameters. The current work investigates the interconnection relation of seven factors; three geometrical factors, two thermophysical factors, and two operational and environmental factors. The studied geometrical factors are the wellbore diameter and length and the tube diameter. The thermal conductivities of the wellbore grout and soil are the studied two thermophysical properties. The two studied operational and environmental factors are the circulating fluid flow rate, circulating fluid input temperature difference with the soil temperature. A 2D axisymmetric CFD model is built to investigate the effect of the controlling parameters on the targeted output saved energy per tube length. Third-order surface response of the main output is achieved using a hybrid Box-Behnken Central-Composite design of experiments methods DOE. The Box-Behnken method concerns the mid of extremes, and the Central-Composite method concerns the rotatable variable interconnections. Although both methods are designed for second-order response surfaces, the proposed hybrid method can accurately predict third-order correlation using the Stepwise regression method on 136 design points. The nonlinear correlation is verified using another 100 random verification points, showing a root mean squared error of less than 1.5 [W/m]. The significance of each parameter on the target normalized saved energy is presented and discussed. The pipe diameter, grout conductivity, soil conductivity, and temperature difference are the most significant parameters controlling the GSHE performance. The water mass flow rate is lesser significant, while the grout diameter is insignificant. The response surface study has shown high normalized saved energy of 100 [W/m] of the pipe length for the investigated domains.

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Shafer, David R. "Six-element lens corrected for all third-and fifth-order aberrations". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/oam.1993.tht.4.

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In a well-corrected complex lens system, with a fairly fast aperture and wide field of view, the image aberrations which limit performance are usually sagittal oblique spherical aberration and higher-order Petzval curvature. Because of aberration balancing in any well-optimized design, it may not be apparent that these two 5th-order aberrations are in fact the limiting aberrations. It is not generally recognized that it is possible to correct all the 3rd and 5th-order monochromatic aberrations to zero in relatively simple designs, without aspherics. Several years ago I found an 8-element solution and more recently several 7-element designs. Now I have found two different 6-element solutions. One has no thick lenses or strong meniscus shapes and can also be corrected for axial and lateral color with no additional elements. I suspect there may be a five-lens solution, without color correction, that would involve some thick lenses.

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Kang, Hwan Il, Min Woo Kwon i Hwan Gil Bae. "PID coefficient designs for the automatic voltage regulator using a new third order particle swarm optimization". W 2010 International Conference on Electronics and Information Engineering (ICEIE 2010). IEEE, 2010. http://dx.doi.org/10.1109/iceie.2010.5559897.

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Hopkins, Robert E. "Lens designs for laser scanning". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.mx1.

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Lenses for laser scanners are currently receiving much attention. Laser scanning lenses basically involve the same design problems as eyepieces. The control of astigmatism, Petzval curvature, and distortion are the most challenging problems. F/theta correction requires just the right amount of third-order distortion. As the field angles increase some control of the higher-order distortion and astigmatism is necessary to maintain the F/theta condition. The telecentric condition of the scanning beam places some constraints on the designs, particularly when the relative aperture is large.

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Eckhardt, Stephen K. "First-order Image surface of nonaxially symmetric optical systems". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/oam.1986.mhh1.

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The standard first-order refraction equation has been rewritten in vector notation for application to nonaxially symmetric optical systems. This makes it possible to map several object points through the system and therefore visualize the image of the entire object plane. This image is a bounded curved surface. Given the shape of the image surface, it is possible to quickly evaluate a configuration of mirrors and/or lenses for application to a given design problem. Several designs are discussed, including some systems in which third-order theory predictions are seriously misleading. If time permits, techniques for determining the amount of keystone and anamorphism present will also be discussed.

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Carniglia, Charles K. "Comparison of various shortwave-pass filter designs". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1987. http://dx.doi.org/10.1364/oam.1987.fe6.

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The simplest shortwave-pass filter design consists of repetitions of the basic period of the form L/2 H L/2, where L and H refer to quarterwaves of low- and high-index materials at a particular wavelength. Such a filter has a passband limited by the first- and third-order rejection bands. The width of the passband can be extended to shorter wavelengths by further subdividing the basic period using materials of intermediate indices. One such class of design, due to Baumeister,1 involves intermediate layers of equal optical thickness, except that the layer of lowest index has twice the optical thickness of the other layers. An alternate design with all layers having equal optical thickness requires that the log of the indices of the layers follows a sinusoidal profile between the lowest and highest indices. To provide the best performance over the transmission band, the Herpin-equivalent index of the coating should be close to the index required for an antireflection coating. Various designs are compared for nondispersive indices ranging from 1.38 to 2.25 on a 1.52 index substrate.

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Braaten, Henning, Halvor Lie i Kjetil Skaugset. "Higher Order Modal Response of Riser Fairings". W ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57971.

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Riser fairings are designed to rotate freely about the riser axis and to passively align with the direction of incident flow so they will effectively streamline the flow and eliminate VIV (Vortex-Induced Vibrations). This rotational degree of freedom introduces the possibility of a complex dynamic phenomenon involving coupling between the hydrodynamic forces and the fairing / riser motions (e.g. cross-flow translation and rotation). Slocum et al. reported a scaled model test of a long flexible riser model with a freely-rotating riser fairing conducted at MARINTEK at OTC-2004. At low flow speeds, the test showed the fairings to be effective. However, at higher towing velocities they became unstable resulting in high displacements at its first bending mode. This paper presents the work related to a study of effectiveness of fairings and is one of several VIV research activities NDP (Norwegian Deepwater Programme) has conducted at MARINTEK in 2002–2007. The present work is partly a follow up activity to the work reported by Slocum et al. The purpose of the present work was to study possible higher order modal response of faired risers and in particular to find out if such response can occur in higher bending modes than the first. A vertically towed instrumented riser was tested with 2 different fairing designs in uniform current profile with different towing speeds. Fairing II was identical to the one used in Slocum et al (2004) while Fairing I represents an alternative design. The riser model was 9.32m long, had diameter of 20mm and was flexible. Both bare riser configuration and full coverage of the two fairing sets were tested. This study documented first-, second- and third-mode responses at high amplitudes (instability behavior) for Fairing II. Tests with Fairing I showed that the riser was stable, but the riser vibrations were found to be similar with respect to displacement amplitudes and frequencies to the bare riser VIV.

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Kumar, Karthik, Luis P. Bernal, Seow Yuen Yee, Ali Besharatian i Khalil Najafi. "Transient Performance and Coupled Acoustic Structural and Electrostatic Modeling of a Multistage Vacuum Micropump". W ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64548.

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This paper describes the theoretical analysis used to design of a multistage peristaltic vacuum micro pump, comprising of two parts. First, three different designs for a 16 stage micropump to achieve a vacuum of 250 torr are investigated. One design produces an equal pressure distribution across each stage at steady state. A second design has equal volume ratio across each stage. The third design is a combination of the other two. The transient behavior of these designs is analyzed using a reduced order model. In the first two designs when the pressure difference across the pump is low most pumping occurs across the first few stages, while for the third design the load is almost equally distributed across all stages. The opposite is observed when the pressure difference across the pump is high. In the second part of the paper, the reduced order model is further developed to account for the effects of electrostatic actuation and membrane dynamics. A non-linear model is proposed for the motion of the membrane and used to study the steady state performance and resonance of a multistage vacuum micro pump as a function of input voltage. It is found that near the acoustic frequency, a lower voltage is required to produce a greater flow.

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Xu, David S., i Hooshang Heshmat. "Modeling of Friction Induced Vibration due to Third-Body Effects". W ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/de-23203.

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Abstract Friction induced vibration at contact interfaces is still a big challenging problem and not well understood how to affect the high cycle fatigue (HCF) failures in gas turbine engine and other machinery. Most researchers conducted on the subject of only two bodies in contact with the Coulomb’s friction law only. In this paper, the interface friction phenomena and induced vibration are investigated by means of the improved third-body composite interface micro-slip model which includes a variable friction coefficient and a flexible contact, represented as effective stiffness and equivalent viscous damping elements. The third-body considered herein is almost always present at contacting interfaces and is comprised of generated wear debris or a soft intermediate anti-fretting coating applied to the mating surfaces. This kind of third-body can be viewed as a thin factional damping material layer to provide shear energy dissipation in order to mitigate the destructive effects of high frequency vibrations in components with highly stressed contacts. A properly engineered third-body can also play the role of both a damping material and a lubricant to decrease wear rate. For the study presented, a semi-empirical formula for the third-body powder properties was employed, depending on the experimental data and the non-linear regression approach. The experimental powder TiO2 data included density, shear strength, frictional coefficients, loss factor as a function of normal load, shear strain, speed and frequency. The results in this paper indicate that the third body semi-empirical equivalent stiffness / viscous damping representation of a flexible contact with variable friction coefficient does indeed have merit and does have influence on overall system response. It has been shown that the third body effects should be considered in the friction and damping induced vibration on the contact interfaces. Such a model may be used to assess designs and material coating approaches to counter fretting in highly stressed contacts as well as assessing the interaction of contact kinematics on HCF failures. Further experimental investigation of specified friction contact configuration of the components needs to be conducted in order to evaluate their friction characteristics and move this technology toward a practical engineering applications.

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Talamini, Brandon, Benjamin Perlman i Jeff Gordon. "Development of a Standard for New Passenger Car Wheel Designs". W ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14735.

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The American Public Transportation Association (APTA) is seeking to develop specifications to ensure that wheels used in transit and commuter applications perform safely under the service conditions to which they are exposed. To this end, a design standard has been conceived to ensure that new wheel designs proposed for such applications are not susceptible to fatigue cracking in the wheel plate and hub. Historically, the Association of American Railroads (AAR) Standard S-660 has been applied in the industry for the purposes of qualifying wheel designs for use in passenger applications. The standard stipulates particular loads to apply in a simple finite element analysis of the new wheel design. The basis for approval is an empirical comparison (by an independent third party) of the results with those in a database of previous analysis results of other qualified wheels. The proposed "S-660 equivalent" design standard is envisioned to be self-qualifying, in that results of the analysis will directly determine whether the wheel design will perform safely in service; a review or approval body will not be required. The new standard is needed to overcome limitations embodied in the current wheel qualification process, namely, the assumption of purely elastic material behavior, the omission of residual stresses due to manufacturing, and the use of comparative approval criteria. The Union Internationale des Chemins de Fer (UIC) introduced a wheel design requirement based on finite element analysis, the results of which are subjected to a fatigue criterion in order to achieve acceptance of the wheel design. As in the current S-660 methodology, a set of thermal and mechanical loads are prescribed. This methodology is essentially self-qualifying as the results of the analysis (obtained following a prescribed procedure) determine whether the wheel design will perform safely in service. The proposed design standard is envisioned to be a combination of the current S-660 analysis requirements and the fatigue calculation-based approach of the UIC. The task force developing the standard is still resolving the specific details of the thermal and mechanical loading requirements. This paper explores the underlying methodology behind the developing standard. A finite element calculation forms the basis of the qualification procedure. Initial (asmanufactured) residual stresses present in a new wheel are determined. Mechanical and thermal loading representative of passenger operations are applied. The analysis yields three characteristic stress distributions: as-manufactured, mechanical, and thermal. The Sines criterion, with temperature-dependent material fatigue properties obtained from testing, is applied to infer whether the candidate wheel design is fatigue-prone. Results are presented for a wheel design currently in transit/commuter service. The APTA committee is currently investigating the thermal and mechanical load levels to be prescribed in the proposed standard.

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