Bibliographies thématiques / Second Order Rotatable Designs

Littérature scientifique sur le sujet « Second Order Rotatable Designs »

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Publié le 8 septembre 2023

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Articles de revues sur le sujet "Second Order Rotatable Designs"

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Das, Rabindra Nath. « Robust Second Order Rotatable Designs : Part I ». Calcutta Statistical Association Bulletin 47, no 3-4 (septembre 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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Emily, Otieno-Roche. « Construction of Second Order Rotatable Simplex Designs ». American Journal of Theoretical and Applied Statistics 6, no 6 (2017) : 297. http://dx.doi.org/10.11648/j.ajtas.20170606.16.

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Das, Rabindra Nath, Partha Pal et Sung H. Park. « Modified Robust Second-Order Slope-Rotatable Designs ». Communications in Statistics - Theory and Methods 44, no 1 (décembre 2014) : 80–94. http://dx.doi.org/10.1080/03610926.2012.732183.

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Das, Rabindra Nath. « Robust Second Order Rotatable Designs Part II (RSORD) ». Calcutta Statistical Association Bulletin 49, no 1-2 (mars 1999) : 65–78. http://dx.doi.org/10.1177/0008068319990106.

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Bhatra Charyulu, N. Ch, A. Saheb Shaik et G. Jayasree. « New Series for Construction of Second Order Rotatable Designs ». European Journal of Mathematics and Statistics 3, no 2 (8 mars 2022) : 17–20. http://dx.doi.org/10.24018/ejmath.2022.3.2.46.

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Second order Rotatable designs have good significance in response surface methodology. In this paper, two new seriesfor the construction the same using Binary Ternary Designs were presented with illustrated examples.
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Emily, Otieno-Roche. « Construction of Weighted Second Order Rotatable Simplex Designs (Wrsd) ». American Journal of Theoretical and Applied Statistics 6, no 6 (2017) : 303. http://dx.doi.org/10.11648/j.ajtas.20170606.17.

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Nath Das, Rabindra, Sung H. Park et Manohar Aggarwal. « On D-optimal robust second order slope-rotatable designs ». Journal of Statistical Planning and Inference 140, no 5 (mai 2010) : 1269–79. http://dx.doi.org/10.1016/j.jspi.2009.11.012.

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Victor Babu, B. Re, et V. L. Narasimhant. « Construction of second order slope rotatable designs through balanced incomplete block designs ». Communications in Statistics - Theory and Methods 20, no 8 (janvier 1991) : 2467–78. http://dx.doi.org/10.1080/03610929108830644.

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Das, Rabindra Nath, Sung H. Park et Manohar Aggarwal. « Robust Second-Order Slope-Rotatable Designs with Maximum Directional Variance ». Communications in Statistics - Theory and Methods 39, no 5 (25 février 2010) : 803–14. http://dx.doi.org/10.1080/03610920902796064.

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Victorbabu, B. Re. « Modified second-order slope rotatable designs with equi-spaced levels ». Journal of the Korean Statistical Society 38, no 1 (mars 2009) : 59–63. http://dx.doi.org/10.1016/j.jkss.2008.07.001.

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Thèses sur le sujet "Second Order Rotatable Designs"

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Chang, Shing I. « Optimal multi-response experimental designs for first and second order models / ». The Ohio State University, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487694389392346.

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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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Sciullo, Charlie. « Augmenting second order designs for model validation and refinement ». 2007. http://etd.lib.fsu.edu/theses/available/etd-11132007-155143.

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Thesis (M.S.)--Florida State University, 2007.
Advisor: James R. Simpson, Florida State University, College of Engineering, Dept. of Industrial and Manufacturing Engineering. Title and description from dissertation home page (viewed Apr. 9, 2008). Document formatted into pages; contains xiv, 62 pages. ETD title page, the author's name: Sciullo, Charles Augustine. Includes bibliographical references.
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Chou, Chi-Lan, et 周祈藍. « Minimal-point Composite Designs for Second-order Response Surfaces ». Thesis, 2007. http://ndltd.ncl.edu.tw/handle/73385494795279579798.

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碩士
國立高雄大學
統計學研究所
95
In this work, we are interested in constructing minimal-point designs for second-order response surfaces. A two-stage method is used. First a proper first-order design with small number of supports would be selected and then the remaining supports are added according to a pre-specified optimal criterion. Here a modified simulated annealing algorithm is applied for finding these designs according to the different criterion. Besides D-optimal criterion, Ds-optimal criterion and rotatable criterion are also used here. Thus based on the three different types of first-order designs, the corresponding minimal-point designs are found numerically. Finally these designs are compared with center composite designs, other small composite designs and minimal-point designs by relative efficiencies. It shows that the proposed composite designs perform well in general.
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Huang, Chao-Ming, et 黃昭銘. « Designs of Second-Order Compensation Bandgap Voltage Reference and Operational Amplifier ». Thesis, 1998. http://ndltd.ncl.edu.tw/handle/23677892478168961690.

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碩士
國立海洋大學
電機工程學系
86
In this thesis, we use full-custom design method to design two differentcircuits, bandgap voltage reference and operational amplifier (OP-Amp). We design three types of bandgap voltage references. They are resistor, MOS and OP-Amp type voltage reference. The MOS type voltage reference isa modified version of resistor type voltage reference, which used to replacelarge resistor. The simulation results show that the MOS type voltage reference has better efficient than the resistor type voltage reference while OP-Amptype voltage reference has different architecture. His merit is that we can get two stability output voltages at the same time. The power supply voltage ofbandgap reference is 5V, and the working range is 3~10V. The MOS type voltage reference has lower temperature coefficient while the temperature coefficient of resistor and OP-Amp type are about 30ppm/℃. This chip is fabricated by UMC 0.8μm DPDM process, and measured by HP 4145/4155. We also design three different OP- Amps in this thesis. The first OP-Amp is a low-voltage OP with supply voltage of 2.8V. We used simple two stage architectonic to design this low-voltage OP. The second OP-Amp is a high-gain OP. Its power supply andgain are 5V and 80db, respectively. The third OP-Amp is a high-bandwidthOP with supply voltage of 3.3V and unit gain bandwidth of 20MHz.
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Lee, Chuan-pin, et 李全濱. « D-Optimal Designs for Second-Order Response Surface Models on a Spherical Design Region with Qualitative Factors ». Thesis, 2010. http://ndltd.ncl.edu.tw/handle/04019339290878953791.

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博士
國立中山大學
應用數學系研究所
98
Experiments with both quantitative and qualitative factors always complicate the selections of experimental settings and the statistical analysis for data. Response surface methodology (RSM) provides the systematic procedures such as the steepest ascent method to develop and improve the response models through the optimal settings of quantitative factors. However the sequential method lacks of exploring the direction of the maximum increase in the response among the qualitative levels. In this dissertation the optimal designs for experiments with both qualitative and quantitative factors are investigated. Focused on the second-order response surface model for quantitative factors, which is widely used in RSM as a good approximation for the true response surface, the approximate and exact D-optimal designs are proposed for the model containing the qualitative effects. On spherical design regions, the D-optimal designs have particular structures for considering the qualitative effects to be fixed or random. In this study, the exact D-optimal designs for a second-order response surface model on a circular design region with qualitative factors are proposed. For this model, the interactions between the quantitative and qualitative factors are assumed to be negligible. Based on this design region, an exact D-optimal design with regular polygon structure is made up according to the remainder terms of the numbers of experimental trials at each qualitative levels divided by 6. The complete proofs of exact D-optimality for models including two quantitative factors and one 2-level qualitative factor are presented as well as those for a model with only quantitative factors. When the qualitative factor has more than 2 levels, a method is proposed for constructing exact designs based on the polygonal structure with high efficiency. Furthermore, a procedure for minimizing the number of support points for the quantitative factors of exact D-optimal designs is also proposed for practical consideration. There are no more than 13 support points for the quantitative factors at an individual qualitative level. When the effects between the quantitative and qualitative factors are taken into consideration, approximate D-optimal designs are investigated for models in which the qualitative effects interact with, respectively, the linear quantitative effects, or the linear effects and 2-factor interactions of the quantitative factors or quadratic effects of the quantitative factors. It is shown that, at each qualitative level, the corresponding D-optimal design consists of three portions as a central composite design but with different weights on the cube portion, star portion and center points. Central composite design (CCD) is widely applied in many fields to construct a second-order response surface model with quantitative factors to help to increase the precision of the estimated model. A chemical study is illustrated to show that the effects of the qualitative factor interacts with 2-factor interactions of the quantitative factors are important but absent in a second-order model including a qualitative factor treated as a coded variable. The verification of the D-optimality for exact designs has become more and more intricate when the qualitative levels or the number of quantitative factors increase, even when the patterns of the exact optimal designs have been speculated. The efficient rounding method proposed by Pukelsheim and Rieder (1992) is a model-free approach and it generates an exact design by apportioning the number of trials on the same support points of a given design. For constructing the exact designs with high efficiencies, a modified efficient rounding method is proposed and is based on the polygonal structure of the approximate D-optimal design on a circular design region. This modification is still based on the same rounding approach by apportioning the number of trials to the concentric circles where the support points of the given design are standing on. Then a regular polygon design will be assigned on the circles by the apportionments. For illustration, the exact designs for a third-order response surface model with qualitative factors are presented as well as those for the second-order model. The results show that nearly D-optimal designs are obtained by the modified procedure and the improvement in D-efficiency is very significant. When the factors with the levels selected randomly from a population, they are treated as with random effects. Especially for the qualitative effects caused by the experimental units that the experimenter is not interested in, one should consider the model with random block effects. In this model, the observations on the same unit are assumed to be correlated and they are uncorrelated between different units. Then the mean response surface is still considered as second-order for quantitative factors but the covariance matrix of the observations is different from the identity matrix. In the fourth part of this dissertation, the locally D-optimal designs on a circular design region are proposed for given the value of the correlations. These optimal designs with the structures based on the regular polygons are similar to the D-optimal designs for the uncorrelated model.
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Weng, Chengguo. « Optimal Reinsurance Designs : from an Insurer’s Perspective ». Thesis, 2009. http://hdl.handle.net/10012/4766.

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The research on optimal reinsurance design dated back to the 1960’s. For nearly half a century, the quest for optimal reinsurance designs has remained a fascinating subject, drawing significant interests from both academicians and practitioners. Its fascination lies in its potential as an effective risk management tool for the insurers. There are many ways of formulating the optimal design of reinsurance, depending on the chosen objective and constraints. In this thesis, we address the problem of optimal reinsurance designs from an insurer’s perspective. For an insurer, an appropriate use of the reinsurance helps to reduce the adverse risk exposure and improve the overall viability of the underlying business. On the other hand, reinsurance incurs additional cost to the insurer in the form of reinsurance premium. This implies a classical risk and reward tradeoff faced by the insurer. The primary objective of the thesis is to develop theoretically sound and yet practical solution in the quest for optimal reinsurance designs. In order to achieve such an objective, this thesis is divided into two parts. In the first part, a number of reinsurance models are developed and their optimal reinsurance treaties are derived explicitly. This part focuses on the risk measure minimization reinsurance models and discusses the optimal reinsurance treaties by exploiting two of the most common risk measures known as the Value-at-Risk (VaR) and the Conditional Tail Expectation (CTE). Some additional important economic factors such as the reinsurance premium budget, the insurer’s profitability are also considered. The second part proposes an innovative method in formulating the reinsurance models, which we refer as the empirical approach since it exploits explicitly the insurer’s empirical loss data. The empirical approach has the advantage that it is practical and intuitively appealing. This approach is motivated by the difficulty that the reinsurance models are often infinite dimensional optimization problems and hence the explicit solutions are achievable only in some special cases. The empirical approach effectively reformulates the optimal reinsurance problem into a finite dimensional optimization problem. Furthermore, we demonstrate that the second-order conic programming can be used to obtain the optimal solutions for a wide range of reinsurance models formulated by the empirical approach.
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Livres sur le sujet "Second Order Rotatable Designs"

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Morris, K. A. Dissipative controller designs for second-order dynamic systems. Hampton, Va : Institute for Computer Applications in Science and Engineering, 1990.

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Jer-Nan, Juang, Langley Research Center et Institute for Computer Applications in Science and Engineering., dir. Dissipative controller designs for second-order dynamic systems. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1990.

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Juang, Jer-Nan. Robust controller designs for second-order dynamic systems : A virtual passive approach. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1990.

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Brock, Fred V., et Scott J. Richardson. Meteorological Measurement Systems. Oxford University Press, 2001. http://dx.doi.org/10.1093/oso/9780195134513.001.0001.

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This book treats instrumentation used in meteorological surface systems, both on the synoptic scale and the mesoscale, and the instrumentation used in upper air soundings. The text includes material on first- and second-order differential equations as applied to instrument dynamic performance, and required solutions are developed. Sensor physics are emphasized in order to explain how sensors work and to explore the strengths and weaknesses of each design type. The book is organized according to sensor type and function (temperature, humidity, and wind sensors, for example), though several unifying themes are developed for each sensor. Functional diagrams are used to portray sensors as a set of logical functions, and static sensitivity is derived from a sensor's transfer equation, focusing attention on sensor physics and on ways in which particular designs might be improved. Sensor performance specifications are explored, helping to compare various instruments and to tell users what to expect as a reasonable level of performance. Finally, the text examines the critical area of environmental exposure of instruments. In a well-designed, properly installed, and well-maintained meteorological measurement system, exposure problems are usually the largest source of error, making this chapter one of the most useful sections of the book.
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Conolly, Jez, et David Owain Bates. Dead of Night. Liverpool University Press, 2015. http://dx.doi.org/10.3828/liverpool/9780993238437.001.0001.

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Released a matter of days after the end of the Second World War and a dozen years ahead of the first full-blooded Hammer Horror, the Ealing Studios horror anthology film Dead of Night featured contributions from some of the finest directors, writers and technicians ever to work in British film. Since its release it has become ever more widely regarded as a keystone in the architecture of horror cinema, both nationally and internationally, yet for a film that packs such a reputation this is the first time a single book has been dedicated to its analysis. Beginning with a brief plot-precis ‘road map’ in order to aid navigation through the film's stories, there follows a discussion of Dead of Night's individual stories, including its frame tale (‘Linking Narrative’), a consideration of the potency of stillness and the suspension of time as devices for eliciting goose bumps, an appraisal of the film in relation to the very English tradition of the festive ghost story, and an analysis of the British post-war male gender crisis embodied by a number of the film's protagonists. The book includes a selection of rarely seen pre-production designs produced by the film's acclaimed production designer, Michael Relph.
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Chapitres de livres sur le sujet "Second Order Rotatable Designs"

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Mee, Robert W. « Response Surface Methods and Second-Order Designs ». Dans A Comprehensive Guide to Factorial Two-Level Experimentation, 397–414. New York, NY : Springer New York, 2009. http://dx.doi.org/10.1007/b105081_12.

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Jones, Bradley, et Christopher J. Nachtsheim. « A Class of Screening Designs Robust to Active Second-Order Effects ». Dans Contributions to Statistics, 105–12. Heidelberg : Physica-Verlag HD, 2010. http://dx.doi.org/10.1007/978-3-7908-2410-0_14.

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Shimada, M., et Kumar K. Tamma. « Implicit Time Integrators and Designs for Nonlinear Second-Order Transient Systems : Elastodynamics ». Dans Encyclopedia of Thermal Stresses, 2409–16. Dordrecht : Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_758.

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Shimada, M., et Kumar K. Tamma. « Implicit Time Integrators and Designs for First-/Second-Order Linear Transient Systems ». Dans Encyclopedia of Thermal Stresses, 2387–96. Dordrecht : Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_763.

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Shimada, M., et Kumar K. Tamma. « Explicit Time Integrators and Designs for First-/Second-Order Linear Transient Systems ». Dans Encyclopedia of Thermal Stresses, 1524–30. Dordrecht : Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_764.

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Park, Sung Hyun, Hyuk Joo Kim et Jae-Il Cho. « Optimal Central Composite Designs for Fitting Second Order Response Surface Linear Regression Models ». Dans Recent Advances in Linear Models and Related Areas, 323–39. Heidelberg : Physica-Verlag HD, 2008. http://dx.doi.org/10.1007/978-3-7908-2064-5_17.

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Shimada, M., et Kumar K. Tamma. « Implicit Time Integrators and Designs for Nonlinear Second-Order Systems : N-Body Systems ». Dans Encyclopedia of Thermal Stresses, 2396–409. Dordrecht : Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-007-2739-7_757.

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Eiben, Agoston E., Emma Hart, Jon Timmis, Andy M. Tyrrell et Alan F. Winfield. « Towards Autonomous Robot Evolution ». Dans Software Engineering for Robotics, 29–51. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-66494-7_2.

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AbstractWe outline a perspective on the future of evolutionary robotics and discuss a long-term vision regarding robots that evolve in the real world. We argue that such systems offer significant potential for advancing both science and engineering. For science, evolving robots can be used to investigate fundamental issues about evolution and the emergence of embodied intelligence. For engineering, artificial evolution can be used as a tool that produces good designs in difficult applications in complex unstructured environments with (partially) unknown and possibly changing conditions. This implies a new paradigm, second-order software engineering, where instead of directly developing a system for a given application, we develop an evolutionary system that will develop the target system for us. Importantly, this also holds for the hardware; with a complete evolutionary robot system, both the software and the hardware are evolved. In this chapter, we discuss the long-term vision, elaborate on the main challenges, and present the initial results of an ongoing research project concerned with the first tangible implementation of such a robot system.
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« OPTIMAL ROBUST SECOND-ORDER SLOPE ROTATABLE DESIGNS ». Dans 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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« Second Order Designs ». Dans Optimal Experimental Design with R, 283–98. Chapman and Hall/CRC, 2011. http://dx.doi.org/10.1201/b10934-17.

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Actes de conférences sur le sujet "Second Order Rotatable Designs"

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Ahmed, Khaled I., Abobakr Almashhor et Mohamed H. Ahmed. « Simulation-Based Correlation for Saved Energy in Ground Source Heat Exchangers for Middle East Region ». Dans 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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Baxevanaki, Kleoniki, et Costas Psychalinos. « Second-Order Bandpass OTA-C Filter Designs for Extracting Waves from Electroencephalogram ». Dans 2019 8th International Conference on Modern Circuits and Systems Technologies (MOCAST). IEEE, 2019. http://dx.doi.org/10.1109/mocast.2019.8742026.

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JUANG, JER-NAN, et MINH PHAN. « Robust controller designs for second-order dynamic systems - A virtual passive approach ». Dans 32nd Structures, Structural Dynamics, and Materials Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1991. http://dx.doi.org/10.2514/6.1991-983.

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Duan, Guang-ren, et Ling Huang. « Disturbance Attenuation in Model Following Designs of a Class of Second-order Systems : a Parametric Approach ». Dans 2006 SICE-ICASE International Joint Conference. IEEE, 2006. http://dx.doi.org/10.1109/sice.2006.315187.

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NGUYEN, NAM-KY. « A MODIFIED CYCLIC-COORDINATE EXCHANGE ALGORITHM AS ILLUSTRATED BY THE CONSTRUCTION OF MINIMUM-POINT SECOND-ORDER DESIGNS ». Dans Proceedings of the Wollongong Conference. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812776372_0021.

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Vatankhah, Ramin, Mohammad Abediny, Hoda Sadeghian et Aria Alasty. « Backstepping Boundary Control for Unstable Second-Order Hyperbolic PDEs and Trajectory Tracking ». Dans ASME 2009 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/detc2009-87038.

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In this paper, a problem of boundary feedback stabilization of second order hyperbolic partial differential equations (PDEs) is considered. These equations serve as a model for physical phenomena such as oscillatory systems like strings and beams. The controllers are designed using a backstepping method, which has been recently developed for parabolic PDEs. With the integral transformation and boundary feedback the unstable PDE is converted into a system which is stable in sense of Lyapunov. Then taylorian expansion is used to achieve the goal of trajectory tracking. It means design a boundary controller such that output of the system follows an arbitrary map. The designs are illustrated with simulations.
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Pegalajar-Jurado, Antonio, et Henrik Bredmose. « Accelerated Hydrodynamic Analysis for Spar Buoys With Second-Order Wave Excitation ». Dans ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-18910.

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Abstract The simplified numerical models commonly employed for the pre-design of floaters for offshore wind only include linear wave loads, due to the higher computational effort required by second-order methods. Second-order hydrodynamics, on the other hand, need to be considered from an early stage, since they cause resonance of the moored structure. In the present study, we introduce a new method to include second-order inviscid hydrodynamic loads at a computational cost similar to linear loads. We compare the accelerated method to standard second-order diffraction theory and to second-order Rainey forcing with Sharma & Dean wave kinematics. The comparison, based on the loads and response of a spar floating wind turbine in surge and pitch, is carried out for three different sea states. We find that a good prediction of the second-order resonant response can be obtained with the accelerated method for medium and severe sea states, while the match is not as good for the mild sea state. The accelerated method is between 400 and 850 times faster than commonly used second-order approaches, for an 1-hour realization of a given sea state. This speed up allows the application of the load model in the floater pre-design, where efficient numerical models are the key to achieve optimal designs and the consequent reduction in the cost of the floater.
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Khelfa, Frank, Lukas Zimmer, Paul Motzki et Stefan Seelecke. « Development of a Reconfigurable End-Effector Prototype ». Dans ASME 2017 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/smasis2017-3788.

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Material handling is a crucial part of manufacturing and assembly in industry. In state-of-the-art handling systems, robots use various end-effectors to grip and transport different shapes of workpieces. The exchange process of fitted end-effectors to appropriate workpieces, often requires to interrupt the manufacturing process. From the prospective of economic efficiency, there is an inherent benefit creating a reconfigurable end-effector that is able to adjust automatically to different workpiece geometries. In this work a novel end-effector prototype based on shape memory alloys (SMA’s) is developed and experimentally validated. The end-effector prototype has four arms with two SMA driven reconfigurable degrees of freedom (DOF’s) to allow gripping of different workpiece shapes and geometries. Each arm is rotatable by 90 degrees (1. DOF) and uses a counterweight to relieve the SMA wire. The tip of the arm is driven by a separate SMA in a 20 degree range and it has a special locking mechanism to hold different positions without any flowing current. The designs of the actuator constructions are presented and a prototype is produced via rapid-prototyping. Future work will include the characterization of the second DOF and controlling the positions of both DOF’s by using a PID controller based on the SMA self-sensing ability.
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Efimova, Tatyana, Tatyana Ishchenko et S. Dunaev. « PLANNING OF EXPERIMENTAL STUDIES WITH THE PURPOSE OF DEVELOPING THE MODE OF FACING DSTP WITH A THIN SLED VENEER OF WOOD MAHAGONI ». Dans Modern machines, equipment and IT solutions for industrial complex : theory and practice. FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov, 2021. http://dx.doi.org/10.34220/mmeitsic2021_219-223.

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The modern market offers mainly furniture made from traditional materials: chipboard and fiberboard, faced with synthetic materials (films, plastics). However, despite the huge variety of synthetic materials, they cannot convey the original texture, color of natural wood. Furniture made of natural wood and furniture made of panel materials, faced with sliced veneer, are classified as premium furniture due to the high cost and shortage of valuable wood species. To reduce the cost of production, it is proposed to use thin sliced and peeled veneer with a thickness of 0.4 mm. The problem is that the most common veneering defect is glue leakage, which depends on many factors, as well as the lack of clear recommendations for the choice of veneering modes. In this regard, the problem of developing a mode for veneering chipboards with thin sliced veneer of mahogany wood is relevant and requires research. The paper identifies variable factors and factors that remained constant during research. The conditions for conducting experimental studies are also given. To develop a methodology for conducting experimental studies, the method of uniform- rotatable planning of a second-order experiment was used.
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Emch, Gary, et Alan Parkinson. « Using Engineering Models to Control Variability : Feasibility Robustness for Worst-Case Tolerances ». Dans ASME 1993 Design Technical Conferences. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/detc1993-0329.

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Abstract Engineering models can and should be used to understand the effects of variability on a design. When variability is ignored, brittle designs can result that fail in service. By contrast, robust designs function properly even when subjected to off-nominal conditions. There is a need for better analytical tools to help engineers develop robust designs. In this paper we present a general method for developing designs that are robust to variability induced by worst-case tolerances. The method adapts nonlinear programming techniques in order to determine how a design should be modified to account for variability. We show how this can be done with second order, or even exact, worst-case tolerance models. Results are given for 13 test cases that span a variety of problems. The method enables a designer to understand and account for the effects of worst-case tolerances, making it possible to build robustness into an engineering design.
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