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Academic literature on the topic 'Truncated moments'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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Journal articles on the topic "Truncated moments"

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Arismendi, J. C. "Multivariate truncated moments." Journal of Multivariate Analysis 117 (May 2013): 41–75. http://dx.doi.org/10.1016/j.jmva.2013.01.007.

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Arismendi, Juan C., and Simon Broda. "Multivariate elliptical truncated moments." Journal of Multivariate Analysis 157 (May 2017): 29–44. http://dx.doi.org/10.1016/j.jmva.2017.02.011.

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Ambrozie, C. G. "On a variational approach to truncated problems of moments." Mathematica Bohemica 138, no. 1 (2013): 105–12. http://dx.doi.org/10.21136/mb.2013.143233.

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Hamedani, G. G. "On characterizations and infinite divisibility of recently introduced distributions." Studia Scientiarum Mathematicarum Hungarica 53, no. 4 (December 2016): 467–511. http://dx.doi.org/10.1556/012.2016.53.4.1347.

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We present here characterizations of the most recently introduced continuous univariate distributions based on: (i) a simple relationship between two truncated moments; (ii) truncated moments of certain functions of the 1th order statistic; (iii) truncated moments of certain functions of the nth order statistic; (iv) truncated moment of certain function of the random variable. We like to mention that the characterization (i) which is expressed in terms of the ratio of truncated moments is stable in the sense of weak convergence. We will also point out that some of these distributions are infinitely divisible via Bondesson’s 1979 classifications.

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Forte, Stefano, and Lorenzo Magnea. "Truncated moments of parton distributions." Physics Letters B 448, no. 3-4 (February 1999): 295–302. http://dx.doi.org/10.1016/s0370-2693(99)00065-9.

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Kim, Hea-Jung. "Moments of truncated Student- distribution." Journal of the Korean Statistical Society 37, no. 1 (March 2008): 81–87. http://dx.doi.org/10.1016/j.jkss.2007.06.001.

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Sium, Simon, and Rama Shanker. "A zero-truncated discrete Akash distribution with properties and applications." Hungarian Statistical Review 3, no. 2 (2020): 12–25. http://dx.doi.org/10.35618/hsr2020.02.en012.

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This study proposes and examines a zero-truncated discrete Akash distribution and obtains its probability and moment-generating functions. Its moments and moments-based statistical constants, including coefficient of variation, skewness, kurtosis, and the index of dispersion, are also presented. The parameter estimation is discussed using both the method of moments and maximum likelihood. Applications of the distribution are explained through three examples of real datasets, which demonstrate that the zero-truncated discrete Akash distribution gives better fit than several zero-truncated discrete distributions.

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Zagorodnyuk, Sergey M. "The operator approach to the truncated multidimensional moment problem." Concrete Operators 6, no. 1 (February 1, 2019): 1–19. http://dx.doi.org/10.1515/conop-2019-0001.

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Abstract We study the truncated multidimensional moment problem with a general type of truncations. The operator approach to the moment problem is presented. The case where the associated operators form a commuting self-adjoint tuple is characterized in terms of the given moments. The case of the dimensional stability is characterized in terms of the prescribed moments as well. Some sufficient conditions for the solvability of the moment problem are presented. A construction of the corresponding solution is described by algorithms. Numerical examples of the construction are provided.

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Mirjalili, A., M. M. Yazdanpanah, and Z. Moradi. "Extracting the QCD Cutoff Parameter Using the Bernstein Polynomials and the Truncated Moments." Advances in High Energy Physics 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/304369.

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Since there are not experimental data over the whole range ofx-Bjorken variable, that is,0<x<1, we are inevitable in practice to do the integration for Mellin moments over the available range of experimental data. Among the methods of analysing DIS data, there are the methods based on application of Mellin moments. We use the truncated Mellin moments rather than the usual moments to analyse the EMC collaboration data for muon-nucleon and WA25 data for neutrino-deuterium DIS scattering. How to connect the truncated Mellin moments to usual ones is discussed. Following that we combine the truncated Mellin moments with the Bernstein polynomials. As a result, Bernstein averages which are related to different orders of the truncated Mellin moment are obtained. These averaged quantities can be considered as the constructed experimental data. By accessing the sufficient experimental data we can do the fitting more precisely. We do the fitting at leading order and next-to-leading order approximations to extract the QCD cutoff parameter. The results are in good agreement with what is being expected.

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Nolan, John P. "Truncated fractional moments of stable laws." Statistics & Probability Letters 137 (June 2018): 312–18. http://dx.doi.org/10.1016/j.spl.2018.02.009.

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Dissertations / Theses on the topic "Truncated moments"

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Hattaway, James T. "Parameter Estimation and Hypothesis Testing for the Truncated Normal Distribution with Applications to Introductory Statistics Grades." Diss., CLICK HERE for online access, 2010. http://contentdm.lib.byu.edu/ETD/image/etd3412.pdf.

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Yoo, Seonguk. "Extremal sextic truncated moment problems." THE UNIVERSITY OF IOWA, 2012. http://pqdtopen.proquest.com/#viewpdf?dispub=3461430.

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Yoo, Seonguk. "Extremal sextic truncated moment problems." Diss., University of Iowa, 2011. https://ir.uiowa.edu/etd/1113.

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Inverse problems naturally occur in many branches of science and mathematics. An inverse problem entails finding the values of one or more parameters using the values obtained from observed data. A typical example of an inverse problem is the inversion of the Radon transform. Here a function (for example of two variables) is deduced from its integrals along all possible lines. This problem is intimately connected with image reconstruction for X-ray computerized tomography. Moment problems are a special class of inverse problems. While the classical theory of moments dates back to the beginning of the 20th century, the systematic study of truncated moment problems began only a few years ago. In this dissertation we will first survey the elementary theory of truncated moment problems, and then focus on those problems with cubic column relations. For a degree 2n real d-dimensional multisequence β ≡ β (2n) ={β i}i∈Zd+,|i|≤2n to have a representing measure μ, it is necessary for the associated moment matrix Μ(n) to be positive semidefinite, and for the algebraic variety associated to β, Vβ, to satisfy rank Μ(n)≤ card Vβ as well as the following consistency condition: if a polynomial p(x)≡ ∑|i|≤2naixi vanishes on Vβ, then Λ(p):=∑|i|≤2naiβi=0. In 2005, Professor Raúl Curto collaborated with L. Fialkow and M. Möller to prove that for the extremal case (Μ(n)= Vβ), positivity and consistency are sufficient for the existence of a (unique, rank Μ(n)-atomic) representing measure. In joint work with Professor Raúl Curto we have considered cubic column relations in M(3) of the form (in complex notation) Z3=itZ+ubar Z, where u and t are real numbers. For (u,t) in the interior of a real cone, we prove that the algebraic variety Vβ consists of exactly 7 points, and we then apply the above mentioned solution of the extremal moment problem to obtain a necessary and sufficient condition for the existence of a representing measure. This requires a new representation theorem for sextic polynomials in Z and bar Z which vanish in the 7-point set Vβ. Our proof of this representation theorem relies on two successive applications of the Fundamental Theorem of Linear Algebra. Finally, we use the Division Algorithm from algebraic geometry to extend this result to other situations involving cubic column relations.

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ARAÚJO, Raphaela Lima Belchior de. "Família composta Poisson-Truncada: propriedades e aplicações." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/16315.

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Submitted by Haroudo Xavier Filho (haroudo.xavierfo@ufpe.br) on 2016-04-05T14:28:43Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) dissertacao_Raphaela(CD).pdf: 1067677 bytes, checksum: 6d371901336a7515911aeffd9ee38c74 (MD5)
Made available in DSpace on 2016-04-05T14:28:43Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) dissertacao_Raphaela(CD).pdf: 1067677 bytes, checksum: 6d371901336a7515911aeffd9ee38c74 (MD5) Previous issue date: 2015-07-31
CAPES
Este trabalho analisa propriedades da família de distribuições de probabilidade Composta N e propõe a sub-família Composta Poisson-Truncada como um meio de compor distribuições de probabilidade. Suas propriedades foram estudadas e uma nova distribuição foi investigada: a distribuição Composta Poisson-Truncada Normal. Esta distribuição possui três parâmetros e tem uma flexibilidade para modelar dados multimodais. Demonstramos que sua densidade é dada por uma mistura infinita de densidades normais em que os pesos são dados pela função de massa de probabilidade da Poisson-Truncada. Dentre as propriedades exploradas desta distribuição estão a função característica e expressões para o cálculo dos momentos. Foram analisados três métodos de estimação para os parâmetros da distribuição Composta Poisson-Truncada Normal, sendo eles, o método dos momentos, o da função característica empírica (FCE) e o método de máxima verossimilhança (MV) via algoritmo EM. Simulações comparando estes três métodos foram realizadas e, por fim, para ilustrar o potencial da distribuição proposta, resultados numéricos com modelagem de dados reais são apresentados.
This work analyzes properties of the Compound N family of probability distributions and proposes the sub-family Compound Poisson-Truncated as a means of composing probability distributions. Its properties were studied and a new distribution was investigated: the Compound Poisson-Truncated Normal distribution. This distribution has three parameters and has the flexibility to model multimodal data. We demonstrated that its density is given by an infinite mixture of normal densities where in the weights are given by the Poisson-Truncated probability mass function. Among the explored properties of this distribution are the characteristic function end expressions for the calculation of moments. Three estimation methods were analyzed for the parameters of the Compound Poisson-Truncated Normal distribution, namely, the method of moments, the empirical characteristic function (ECF) and the method of maximum likelihood (ML) by EM algorithm. Simulations comparing these three methods were performed and, finally, to illustrate the potential of the proposed distribution numerical results with real data modeling are presented.

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Paditz, Ludwig. "Beiträge zur expliziten Fehlerabschätzung im zentralen Grenzwertsatz." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-115105.

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In der Arbeit wird das asymptotische Verhalten von geeignet normierten und zentrierten Summen von Zufallsgrößen untersucht, die entweder unabhängig sind oder im Falle der Abhängigkeit als Martingaldifferenzfolge oder stark multiplikatives System auftreten. Neben der klassischen Summationstheorie werden die Limitierungsverfahren mit einer unendlichen Summationsmatrix oder einer angepaßten Folge von Gewichtsfunktionen betrachtet. Es werden die Methode der charakteristischen Funktionen und besonders die direkte Methode der konjugierten Verteilungsfunktionen weiterentwickelt, um quantitative Aussagen über gleichmäßige und ungleichmäßige Restgliedabschätzungen in zentralen Grenzwertsatz zu beweisen. Die Untersuchungen werden dabei in der Lp-Metrik, 1
In the work the asymptotic behavior of suitably centered and normalized sums of random variables is investigated, which are either independent or occur in the case of dependence as a sequence of martingale differences or a strongly multiplicative system. In addition to the classical theory of summation limiting processes are considered with an infinite summation matrix or an adapted sequence of weighting functions. It will be further developed the method of characteristic functions, and especially the direct method of the conjugate distribution functions to prove quantitative statements about uniform and non-uniform error estimates of the remainder term in central limit theorem. The investigations are realized in the Lp metric, 1

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Hasan, Abeer. "A Study of non-central Skew t Distributions and their Applications in Data Analysis and Change Point Detection." Bowling Green State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1371055538.

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Chen, Hsuan-Yu, and 陳宣佑. "On Moments and Slice Sampling for Truncated Multivariate t Distributions." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/92971530514245682627.

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碩士
國立中興大學
應用數學系所
99
The use of truncated distributions arises often in a wide variety of scientific problems. There have been a lot of sampling schemes and proposals developed for various specific truncated distributions. In the literature, the study of the truncated multivariate t (TMVT) distribution has rarely been discussed. In this paper, we first present general formulae for computing the first and second moments of the TMVT distribution under the doubly truncated case. We formulate the results as analytic matrix expressions, which can be directly computed in existing software. Results for truncation on the left and right can be viewed as special cases. We apply the slice sampling algorithm to generate random variates from the TMVT distribution by introducing auxiliary variables. This strategic approach can result in a series of full conditional densities that are all uniform distributions. Several examples and practical applications are given to illustrate the effectiveness and importance of the proposed results.

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di, Dio Philipp J. "The Truncated Moment Problem." 2018. https://ul.qucosa.de/id/qucosa%3A21536.

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Kley, Susanne. "The Truncated Matricial Hamburger Moment Problem and Corresponding Weyl Matrix Balls." 2020. https://ul.qucosa.de/id/qucosa%3A74300.

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The present thesis intents on analysing the truncated matricial Hamburger power moment problem in the general (degenerate and non-degenerate) case. Initiated due to manifold lines of research, by this time, outnumbering results and thoughts have been established that are concerned with specific subproblems within this field. The resulting presence of such a diversity as well as an extensively considered topic si- multaneously involves advantageous as well as obstructive aspects: on the one hand, we adopt the favourable possibility to capitalise on essential available results that proved beneficial within subsequent research. Nevertheless, on the other hand, we are obliged to illustrate major preparatory work in order to illucidate the comprehension of the attaching examination. Moreover, treating the matricial cases of the respective problems requires meticulous technical demands, in particular, in view of the chosen explicit approach to solving the considered tasks. Consequently, the first part of this thesis is dedicated to furnishing the necessary basis arranging the prime results of this research paper. Compul- sary notation as well as objects are introduced and thoroughly explained. Furthermore, the required techniques in order to achieve the desired results are characterised and ex- haustively discussed. Concerning the respective findings, we are afforded the opportunity to seise presentations and results that are, by this time, elaborately studied. Being equipped with mandatory cognisance, the thematically bipartite second and pivo- tal part objectives to describe all the possible values of all the solution functions of the truncated matricial Hamburger power moment problem M P [R; (s j ) 2n j=0 , ≤]. Aming this, we realise a first paramount achievement epitomising one of the two parts of the main results: Capturing an established representation of the solution set R 0,q [Π + ; (s j ) 2n j=0 , ≤] of the assigned matricial Hamburger moment problem via operating a specific algorithm of Schur-type, we expand these findings. We formulate a parameterisation of the set R 0,q [Π + ; (s j ) 2n j=0 , ≤] which is compatible with establishing respective equivalence classes within a certain subset of Nevanlinna pairs and utilise specific systems of orthogonal polynomials in order to entrench novel representations. In conclusion, we receive a para- meterisation that is valid within the entire upper open complex half-plane Π + . The second of the two prime parts changes focus to analysing all possible values of the functions belonging to R 0,q [Π + ; (s j ) 2n j=0 , ≤] in an arbitrary point w ∈ Π + . We gain two decisive conclusions: We identify these respective values to exhaust particular matrix balls 2n K[(s j ) 2n j=0 , w] := {F (w) | F ∈ R 0,q [Π + ; (s j ) j=0 , ≤]} the parameters of which are feasable to being described by specific rational matrix-valued functions and, in this course, enhance formerly established analyses. Moreover, we compile an alternative representation of the semi-radii constructing the respective matrix balls which manifests supportive in further consideration. We seise the achieved parameterisation of the set K[(s j ) 2n j=0 , w] and examine the behaviour of the respective sequences of left and right semi-radii. We recognise that these sequences of semi-radii associated with the respective matrix balls in the general case admit a particular monotonic behaviour. Consequently, with increasing number of given data, the resulting matrix balls are identified as being nested. Moreover, a proper description of the limit case of an infinite number of prescribed moments is facilitated.:1. Brief Historic Embedding and Introduction 2. Part I: Initialising Compulsary Cognisance Arranging Principal Achievements 2.1. Notation and Preliminaries 2.2. Particular Classes of Holomorphic Matrix-Valued Functions 2.3. Nevanlinna Pairs 2.4. Block Hankel Matrices 2.5. A Schur-Type Algorithm for Sequences of Complex p × q Matrices 2.6. Specific Matrix Polynomials 3. Part II: Momentous Results and Exposition – Improved Parameterisations of the Set R 0,q [Π + ; (s j ) 2n j=0 , ≤] 3.1. An Essential Step to a Parameterisation of the Solution Set R 0,q [Π + ; (s j ) 2n j=0 , ≤] 3.2. Parameterisation of the Solution Set R 0,q [Π + ; (s j ) 2n j=0 3.3. Particular Matrix Polynomials 3.4. Description of the Solution Set of the Truncated Matricial Hamburger Moment Problem by a Certain System of Orthogonal Matrix Polynomials 4. Part III: Prime Results and Exposition – Novel Description Balls 4.1. Particular Rational Matrix-Valued Functions 4.2. Description of the Values of the Solutions 4.3. Monotony of the Semi-Radii and Limit Balls of the Weyl Matrix 5. Summary of Principal Achievements and Prospects A. Matrix Theory B. Integration Theory of Non-Negative Hermitian Measures

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Schröder, Torsten. "Some considerations on a truncated matricial power moment problem of Stieltjes-type." 2018. https://ul.qucosa.de/id/qucosa%3A33706.

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This work investigate two different approaches for the parametrization of a special moment problem of Stieltjes-type. On the one hand we deal with systems of Potapov's fundamental matrix inequalities. Thereby, we examine certain invariant subspaces, so-called Dubovoj subspaces, and special matrix polynomials as wells as their associated J- forms. On the other hand we consider a Schur-analytic approach and present a special one-step algorithm. Moreover, considerations on linear fractional transformations of matrices serve as an important tool for the development of the algorithm. Both representations aim at a description of the solution in the non-degenerate case as well as in the different degenerate cases.

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Books on the topic "Truncated moments"

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Curto, Raúl E. Solution of the truncated complex moment problem for flat data. Providence, R.I: American Mathematical Society, 1996.

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Newey, Whitney K. Conditional moment restrictions in censored and truncated regression models. Cambridge, Mass: Dept. of Economics, Massachusetts Institute of Technology, 1999.

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Book chapters on the topic "Truncated moments"

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Glänzel, Wolfgang. "A Characterization Theorem Based on Truncated Moments and its Application to Some Distribution Families." In Mathematical Statistics and Probability Theory, 75–84. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3965-3_8.

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Schmüdgen, Konrad. "Multidimensional Truncated Moment Problems: Existence." In Graduate Texts in Mathematics, 415–43. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-64546-9_17.

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Schmüdgen, Konrad. "The Truncated Moment Problem for Homogeneous Polynomials." In Graduate Texts in Mathematics, 471–97. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-64546-9_19.

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Schmüdgen, Konrad. "Multidimensional Truncated Moment Problems: Basic Concepts and Special Topics." In Graduate Texts in Mathematics, 445–70. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-64546-9_18.

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Schmüdgen, Konrad. "The One-Dimensional Truncated Hamburger and Stieltjes Moment Problems." In Graduate Texts in Mathematics, 203–28. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-64546-9_9.

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Adamyan, Vadim M., and Igor M. Tkachenko. "General Solution of the Stieltjes Truncated Matrix Moment Problem." In Operator Theory and Indefinite Inner Product Spaces, 1–22. Basel: Birkhäuser Basel, 2005. http://dx.doi.org/10.1007/3-7643-7516-7_1.

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Schmüdgen, Konrad. "The One-Dimensional Truncated Moment Problem on a Bounded Interval." In Graduate Texts in Mathematics, 229–55. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-64546-9_10.

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Rivero, Abdon Eddy Choque. "Multiplicative Structure of the Resolvent Matrix for the Truncated Hausdorff Matrix Moment Problem." In Interpolation, Schur Functions and Moment Problems II, 193–210. Basel: Springer Basel, 2012. http://dx.doi.org/10.1007/978-3-0348-0428-8_4.

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Fritzsche, Bernd, Bernd Kirstein, and Conrad Mädler. "An application of the Schur complement to truncated matricial power moment problems." In Operator Theory, Analysis and the State Space Approach, 215–38. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-04269-1_9.

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Adamyan, V. M., and I. M. Tkachenko. "Solution of the Truncated Matrix Hamburger Moment Problem According to M.G. Krein." In Operator Theory and Related Topics, 33–51. Basel: Birkhäuser Basel, 2000. http://dx.doi.org/10.1007/978-3-0348-8413-6_3.

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Conference papers on the topic "Truncated moments"

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Zhong, Qian, and Ronald W. Yeung. "Wave-Body Interactions Among an Array of Truncated Vertical Cylinders." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-55055.

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A semi-analytical method is developed to investigate water-wave radiation and diffraction by an array of truncated vertical cylinders as a model for a point-absorber wave farm. Each cylinder can have independent movements in six modes. The method of matched eigenfunction expansions is applied to obtain the velocity potential for the fluid. To achieve fast computation, the effects of evanescent modes of locally scattered waves from one cylinder are neglected in the near fields of the neighboring cylinders. Wave-exciting forces and moments on an individual cylinder or a group of cylinders, situated among an array, are evaluated by a new, generalized form of Haskind relation that is applicable to an array configuration. In results, hydrodynamic coefficients and wave-exciting loads are presented for arrays of different configurations. Comparisons between wave-exciting loads obtained from the generalized Haskind relation and those from direct diffraction solutions show excellent agreements.

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Winterstein, Steven R., and Sverre Haver. "Modelling Shallow-Water Waves: Truncated Hermite Models and the ShallowWave Routine." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41469.

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Statistical modelling of ocean waves is complicated by their nonlinearity, which leads in turn to non-Gaussian statistical behavior. While non-Gaussianity is present even in deep-water applications, its effects are especially pronounced as water depths decrease. We apply two types of wave models here: (1) local models of extreme wave heights/periods and breaking limits, and (2) random process models of the entire non-Gaussian wave surface. For the random process approach, we derive a new “truncated” Hermite model, which can reflect four moments and both upper- and lower-bound limiting values due to breaking and finite-depth effects. Results are calibrated and compared with an extensive model test series, comprising up to 23 hrs of histories across 19 seastates, at depths from 15–67m (full scale).

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Senan, Aswathy, and P. Krishnankutty. "Numerical Estimation of Nonlinear Wave Forces on a Multi-Hull Barge Using Finite Element Method." In ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83090.

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This paper deals with the estimation of second order wave excitation forces on a free floating triple-hull barge using software developed based on finite element method. The wave-hull interaction nonlinear problem is presented here using the perturbation method, where potential flow theory is used. In the finite element model, the absorbing or nonreflecting far boundary condition is applied at a truncated surface in the form of boundary damper. The software developed for the solution of this nonlinear problem is validated for two and three-dimensional cases for which analytical and other numerical solutions are known. A convergence study on the three-dimensional cylinder problem is carried out to derive a guideline in selecting finite element mesh density and its grading. A triple-hull barge problem is selected here as a practical problem to study the nonlinear wave effects on the forces and motions. A grid independent study on this problem is carried out by using four finite element meshes of different density and grading. The optimum mesh selected from this study is used for further analysis of the problem. Bandwidth optimization is carried out on the generated meshes in order to reduce the computational effort, as the finite element algorithm used here is based on the banded solver technique. The second order wave excitation forces and moments on the barge estimated for different wave steepness (H/Lw - 0.08 to 0.012) in oblique sea condition shows that the second order surge and heave forces amounts up to 49% and 17.5% respectively and the second order yaw moment up to 39% when compared with the first order (linear) wave forces. Similar trend is observed for the forces and moments in beam sea and head sea conditions.

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Zhou, Xueqian, Serge Sutulo, and C. Guedes Soares. "Computation of Ship-to-Ship Interaction Forces by a 3D Potential Flow Panel Method in Finite Water Depth." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20497.

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The double-body 3D potential flow code developed earlier for computing hydrodynamic interaction forces and moments acting on the hulls of the ships sailing in close proximity with neighbouring ships or some other obstacles, is extended to the shallow water case. Two methods for accounting for the finite water depth were implemented: use of truncated mirror image series, and distribution of an additional single layer of sources on parts of the seabed beneath the moving hulls. While the first method does only apply to the flat horizontal seabed, the second one can also deal with the arbitrary bathymetry situations. As appropriate choice of the discretization parameters can significantly affect the accuracy and efficiency of the second method, the present contribution focuses on comparative computations aiming at defining reasonable dimensions of the moving panelled area on the sea bottom and maximum admissible size of the bottom panel. As result, conclusions concerning optimal parameters of the additional set of panels are drawn.

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Bagci, Cemil. "Complete Shaking-Force, -Moment, and, -Torque Balancing of Multi-Cylinder Engines Without Requiring Harmonic Balancers." In ASME 1996 Design Engineering Technical Conferences and Computers in Engineering Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-detc/mech-1188.

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Abstract Conventional engine balancing process truncates the piston acceleration to form harmonics form for the shaking force; then using dynamically equivalent two-particle mass system for the connecting rod, the shaking force is balanced by arranging the phase angles of the crank throws. During this process, the shaking torque balancing (about the crank shaft axis) is ignored. Shaking force due to truncated portion of piston acceleration is left unbalanced; and that some phase angle arrangements cannot balance the harmonics of the shaking force. This requires force harmonic balancers. Unbalanced inertial forces generate shaking moment about the transverse axis (normal to crankshaft axis) that remains unbalanced. Shaking moment due to force harmonics for some phase angles also remain unbalanced. They require moment harmonic balancers. This article presents a complete balancing method by which shaking force in each slider-crank loop is completely balanced. This also means that shaking moment is also completely balanced, thus eliminating the need for both force-, and moment-harmonic balancers. Article uses linearly independent mass vector method to retain the total center of mass of each slider-crank loop stationary. Shaking torque (sum of the inertial torques about the axis parallel to the crankshaft axis) causes variation in the output torque generated. This variation may be considered when designing the flywheel. However, the shaking torque is also balanced (or minimized) retaining the total angular momentum of each loop constant by arranging the phase angles of the crank throws. Several multi-cylinder engines are completely balanced for shaking force, shaking moment and shaking torque in the application examples, including balanced designs of connecting rod and throw sides.

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Pare, Claude, and Pierre-Andre Belanger. "Propagation analysis of the truncated second-order moment." In Third International Workshop on Laser Beam and Optics Characterization, edited by Michel Morin and Adolf Giesen. SPIE, 1996. http://dx.doi.org/10.1117/12.259887.

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Ulku, Evren, Cagri Ozgur, Mustafa Kemal Ozkan, Nish Vaidya, Hari Srivastava, and Tetsuharu Tanoue. "Criteria for High Frequency Cutoff Based on ABWR Reactor Building Vibratory Loads." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-98034.

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In the seismic analysis practice, the calculation of modal response has traditionally been limited to a cutoff frequency of about 33 Hz based on United States Nuclear Regulatory Commission (US NRC) Regulatory Guide (RG) 1.60 [1] response spectra. The structural response in higher modes is calculated as a missing mass correction by static analysis. Seismic ground motions at several sites (such as Central and Eastern United States) exhibit high frequency content, up to about 100 Hz. Additionally, the reactor building vibratory (RBV) loads that result from the suppression pool hydrodynamic loads due to loss of coolant accident (LOCA), and the annulus pressurization (AP) load from a postulated pipe break at the reactor pressure vessel (RPV) safe ends and shield wall generate peaks at frequencies in excess of 100 Hz. The qualification of safety equipment supported in the reactor building needs to reflect these high frequency motions. Extracting frequencies and mode shapes up to zero period acceleration (ZPA) frequencies in these cases may not be practical or economical. Therefore, the cutoff frequency criteria for these types of high frequency loads need to be evaluated so that the analysis produces a representative and a reasonably conservative response. In this study, the equipment response is described in terms of stress quantities, member forces, and moments resulting from the solution up to a cutoff frequency. The responses are compared to the full solution up to the ZPA frequency under hydrodynamic and AP loads using the Response Spectrum Method. The cutoff frequency is deemed adequate if the ratio of the truncated response considering missing mass to the full response is 90% or greater. The internal strain energy (or its surrogate kinetic energy) for all modes with frequencies below the cutoff is also studied to assess the missing strain energy in modes in excess of the cutoff. The evaluation presented also examines how well the strain energy correlates with calculated stresses.

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Wenle Zhang. "MADALINE neural network with truncated momentum for LTV MIMO system identification." In 2012 24th Chinese Control and Decision Conference (CCDC). IEEE, 2012. http://dx.doi.org/10.1109/ccdc.2012.6244256.

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Kim, J. H., Wenle Zhang, Seung-Ki Ryu, and Yoon-Seuk Oh. "An ADALINE neural network with truncated momentum for system identification of linear time varying systems." In 2012 IEEE International Conference on Industrial Technology (ICIT 2012). IEEE, 2012. http://dx.doi.org/10.1109/icit.2012.6209953.

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McCormick, Michael E., and Jeffrey Cerquetti. "Alternative Wave-Induced Force and Moment Expressions for a Fixed, Vertical, Truncated, Circular Cylinder in Waters of Finite Depth." In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51330.

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Two user-friendly expressions for the horizontal and vertical wave-induced forces on fixed, truncated circular cylinders are presented. The approximation of the horizontal force is that of van Oortmerssen, and that of the vertical force is based on a solution of the Laplace equation with a matching radial-force condition at the internal-external interface. The velocity potential resulting from the solution is assumed to be finite at the origin of the radial coordinate. Results obtained from both approximations are compared with results obtained from the rigorous analysis of Garrett. Also, results from the Froude-Krylov approximation for the vertical force are presented for the sake of comparison. The van Oortmerssen are shown to coalesce with the Garrett results for ka > 1.5, while the vertical force results compare well over the ka range studied.

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