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Articoli di riviste sul tema "Mechanical computation"

Autore: Grafiati

Pubblicato: 29 luglio 2024

Ultima modifica: 30 luglio 2024

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1

Laishram, Jummi, Daniela Avossa, Rajesh Shahapure e Vincent Torre. "Mechanical Computation in Neurons". Biophysical Journal 96, n. 3 (febbraio 2009): 628a—629a. http://dx.doi.org/10.1016/j.bpj.2008.12.3323.

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2

Laishram, Jummi, Daniela Avossa, Rajesh Shahapure e Vincent Torre. "Mechanical computation in neurons". Developmental Neurobiology 69, n. 11 (15 settembre 2009): 731–51. http://dx.doi.org/10.1002/dneu.20733.

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3

Sathyan, Sabin, Ugur Aydin e Anouar Belahcen. "Acoustic Noise Computation of Electrical Motors Using the Boundary Element Method". Energies 13, n. 1 (3 gennaio 2020): 245. http://dx.doi.org/10.3390/en13010245.

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This paper presents a numerical method and computational results for acoustic noise of electromagnetic origin generated by an induction motor. The computation of noise incorporates three levels of numerical calculation steps, combining both the finite element method and boundary element method. The role of magnetic forces in the production of acoustic noise is established in the paper by showing the magneto-mechanical and vibro-acoustic pathway of energy. The conversion of electrical energy into acoustic energy in an electrical motor through electromagnetic, mechanical, or acoustic platforms is illustrated through numerical computations of magnetic forces, mechanical deformation, and acoustic noise. The magnetic forces were computed through 2D electromagnetic finite element simulation, and the deformation of the stator due to these forces was calculated using 3D structural finite element simulation. Finally, boundary element-based computation was employed to calculate the sound pressure and sound power level in decibels. The use of the boundary element method instead of the finite element method in acoustic computation reduces the computational cost because, unlike finite element analysis, the boundary element approach does not require heavy meshing to model the air surrounding the motor.

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4

Newland, D. E., e Eric E. Ungar. "Mechanical Vibration Analysis and Computation". Journal of the Acoustical Society of America 88, n. 5 (novembre 1990): 2506. http://dx.doi.org/10.1121/1.400056.

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5

Newland, D. E., e Andres Soom. "Mechanical Vibration Analysis and Computation". Journal of Applied Mechanics 59, n. 2 (1 giugno 1992): 469. http://dx.doi.org/10.1115/1.2899551.

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6

Barr, A. D. S. "Mechanical vibration analysis and computation". Journal of Sound and Vibration 139, n. 3 (giugno 1990): 535–36. http://dx.doi.org/10.1016/0022-460x(90)90684-r.

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7

Peng, Guoyi. "A Practical Combined Computation Method of Mean Through-Flow for 3D Inverse Design of Hydraulic Turbomachinery Blades". Journal of Fluids Engineering 127, n. 6 (1 luglio 2005): 1183–90. http://dx.doi.org/10.1115/1.2062787.

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A practical combined computation method of the circumferentially averaged mean through-flow is presented for 3D inverse computations of hydraulic turbomachinery blades to consider the influence of interrelated hydraulic components. A comprehensive computation domain including the runner blades and related components is adopted and the mean flow is calculated altogether by solving a set of rotational flow governing equations simultaneously. The method has been applied to the case of Kaplan turbine. Computational results were compared to experimental data and their agreement was confirmed. Numerical investigation indicates that the mean flow is dependent on the configuration of guide vanes and the effect of runner blades reaches to the far upstream. The importance of properly taking account of the effect of blade geometry and the influence of interrelated hydraulic components is demonstrated.

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8

Schoenauer, Marc, Leila Kallel e François Jouve. "Mechanical inclusions identification by evolutionary computation". Revue Européenne des Éléments Finis 5, n. 5-6 (gennaio 1996): 619–48. http://dx.doi.org/10.1080/12506559.1996.10511240.

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9

Cai, Jiaze. "A Fully Mechanical Realization of PID Controller". Highlights in Science, Engineering and Technology 9 (30 settembre 2022): 319–28. http://dx.doi.org/10.54097/hset.v9i.1861.

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PID controller is one of the most widely used control elements in the industry. Over history, people have implemented the PID controller mechanically with pneumatical components, electronically in circuits, or digitally using DSP. However, the pure mechanical realization of PID controllers is rarely studied. This paper presents an analog PID controller based on mechanical computation components, including a mechanical integrator, a mechanical differentiator, mechanical constant multipliers, and a mechanical adder. In this work, those parts are studied respectively with CAE modeling and mathematical derivation. A novel design of mechanical differentiator is also introduced to conduct the calculation of the differential part on the PID controller. This work explores the theoretical possibility of a new form of PID controller realization, that is, applying the method of mechanical analog computation to the implementation of a PID controller.

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10

Ravani, B., e Q. J. Ge. "Computation of Spatial Displacements From Geometric Features". Journal of Mechanical Design 115, n. 1 (1 marzo 1993): 95–102. http://dx.doi.org/10.1115/1.2919331.

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This paper develops the theoretical foundation for computations of spatial displacements from the simple geometric features of points, lines, planes, and their combinations. Using an oriented projective three space with a Clifford Algebra, all these three features are handled in a similar fashion. Furthermore, issues related to uniqueness of computations and minimum number of required features are discussed. It is shown that contrary to the common intuition, specification of a minimum of four points (planes) or three lines are necessary for computation of a unique displacement. Only when the sense of the orientations of these features are specified then the minimum number of required features reduces to three for points and planes and two for lines. The results, in addition to their theoretical interest in computational geometry of motion, have application in robot calibration.

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Mao, Andrew, Ariel Procaccia e Yiling Chen. "Better Human Computation Through Principled Voting". Proceedings of the AAAI Conference on Artificial Intelligence 27, n. 1 (29 giugno 2013): 1142–48. http://dx.doi.org/10.1609/aaai.v27i1.8460.

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Designers of human computation systms often face the need to aggregate noisy information provided by multiple people. While voting is often used for this purpose, the choice of voting method is typically not principled. We conduct extensive experiments on Amazon Mechanical Turk to better understand how different voting rules perform in practice. Our empirical conclusions show that noisy human voting can differ from what popular theoretical models would predict. Our short-term goal is to motivate the design of better human computation systems; our long-term goal is to spark an interaction between researchers in (computational) social choice and human computation.

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12

CASTAGNOLI, GIUSEPPE. "QUANTUM STEADY COMPUTATION". International Journal of Modern Physics B 05, n. 13 (10 agosto 1991): 2253–69. http://dx.doi.org/10.1142/s0217979291000870.

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Current conceptions of "quantum mechanical computers" inherit from conventional digital machines two apparently interacting features, machine imperfection and temporal development of the computational process. On account of machine imperfection, the process would become ideally reversible only in the limiting case of zero speed. Therefore the process is irreversible in practice and cannot be considered to be a fundamental quantum one. By giving up classical features and using a linear, reversible and non-sequential representation of the computational process — not realizable in classical machines — the process can be identified with the mathematical form of a quantum steady state. This form of steady quantum computation would seem to have an important bearing on the notion of cognition.

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13

Stanislawczyk, A. "Advanced Techniques for Determining High and Extreme High Damping: OMI - A New Algorithm to Compute the Logarithmic Decrement". Key Engineering Materials 319 (settembre 2006): 231–0. http://dx.doi.org/10.4028/www.scientific.net/kem.319.231.

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A new algorithm OMI (Optimization in Multiple Intervals) for the computation of the logarithmic decrement from exponentially damped harmonic oscillations is described. This method is shown to be effective and computationally compact for high damping materials. A comparison between the OMI algorithm and the four classical methods usually used in the computation of the logarithmic decrement is reported. The OMI algorithm yields high precision in the computation of the logarithmic decrement and the smallest dispersion of experimental points on the plots of mechanical loss spectra. The effect of the acquisition parameters and the experimental conditions on the results of computations of the logarithmic decrement and the relative error is discussed.

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Krishnamurthy, E. V. "Computational Power of Quantum Machines, Quantum Grammars and Feasible Computation". International Journal of Modern Physics C 09, n. 02 (marzo 1998): 213–41. http://dx.doi.org/10.1142/s0129183198000170.

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This paper studies the computational power of quantum computers to explore as to whether they can recognize properties which are in nondeterministic polynomial-time class (NP) and beyond. To study the computational power, we use the Feynman's path integral (FPI) formulation of quantum mechanics. From a computational point of view the Feynman's path integral computes a quantum dynamical analogue of the k-ary relation computed by an Alternating Turing machine (ATM) using AND-OR Parallelism. Hence, if we can find a suitable mapping function between an instance of a mathematical problem and the corresponding interference problem, using suitable potential functions for which FPI can be integrated exactly, the computational power of a quantum computer can be bounded to that of an alternating Turing machine that can solve problems in NP (e.g, factorization problem) and in polynomial space. Unfortunately, FPI is exactly integrable only for a few problems (e.g., the harmonic oscillator) involving quadratic potentials; otherwise, they may be only approximately computable or noncomputable. This means we cannot in general solve all quantum dynamical problems exactly except for those special cases of quadratic potentials, e.g., harmonic oscillator. Since there is a one to one correspondence between the quantum mechanical problems that can be analytically solved and the path integrals that can be exactly evaluated, we can say that the noncomputability of FPI implies quantum unsolvability. This is the analogue of classical unsolvability. The Feynman's path graph can be considered as a semantic parse graph for the quantum mechanical sentence. It provides a semantic valuation function of the terminal sentence based on probability amplitudes to disambiguate a given quantum description and obtain an interpretation in a linear time. In Feynman's path integral, the kernels are partially ordered over time (different alternate paths acting concurrently at the same time) and multiplied. The semantic valuation is computable only if the FPI is computable. Thus both the expressive power and complexity aspects quantum computing are mirrored by the exact and efficient integrability of FPI.

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15

Keith, TG, S. Cioc e H. Jiang. "Spreadsheet computations of a symmetric double wedge airfoil in supersonic flow". International Journal of Mechanical Engineering Education 48, n. 3 (19 gennaio 2019): 255–70. http://dx.doi.org/10.1177/0306419018819838.

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In this paper, the virtues of spreadsheet computation are demonstrated by determining the well-known lift and drag characteristics of a symmetric double wedge airfoil in supersonic flow. The computations require the use of shock-expansion theory of gas dynamics. This determination is a standard problem in gas dynamics that, while simple in nature, involves considerable computation. Spreadsheet solvers greatly diminish this effort and allow students to focus more on the physics of the problem. Moreover, they enable students to explore the problem in more detail.

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16

Zhou, Huan, Zhijian Ding, Wei Zheng e Guojian Tang. "Extension local representation of gravity anomaly along glide trajectory". Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 232, n. 9 (19 aprile 2017): 1764–86. http://dx.doi.org/10.1177/0954410017704006.

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An extension local representation and its corresponding fast approximation scheme for the computation of the gravity anomaly along glide trajectories of a hypersonic vehicle are initially proposed, involving field model reconstruction, channel model reconstruction, and onboard approximation. To meet the needs of temporary mission changes, the mathematic model for the tridimensional envelope of glide trajectories is deduced, and thus developing a universal field model by dividing the domain and assigning values to the nodes. To lighten the computational burden, a local channel model is reconstructed by the acquisition of the data of nodes for the three-level extension cells which the planned trajectory flies through. The multi-gridded scheme restrains the actual glide trajectory from flying beyond the channel while the extension approximation achieves a high-fidelity computation of the gravity anomaly. To simplify the partitioning process, a “transposed-pole” coordinate system is employed. Simulations indicate that the approximation accuracy of the extension method is over an order of magnitude higher than that of the nonextension method. The terminal positional deviations of glide trajectories due to approximation errors are beneath 1 m and 100 m on the partitioning schemes of [Formula: see text] and [Formula: see text], respectively. By using the scheme of [Formula: see text], it just needs 816 memorized data and 76.781 s to achieve the computation of a glide trajectory containing 10,000 calculation points, with a 100-times enhanced trajectory accuracy. The onboard computational time for the proposed method is only 6000th of that for 1080-order spherical harmonics. The high-adaptability for temporary mission changes and the virtues of exactness, rapidity, and applicability make this method attractive for both of onboard computations and offline analysis of gravity anomaly along glide trajectories.

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17

Lawford, P. V., A. J. Narracott, V. Diaz e D. R. Hose. "Computation of closure forces for mechanical heart valves". Journal of Biomechanics 39 (gennaio 2006): S305. http://dx.doi.org/10.1016/s0021-9290(06)84190-4.

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18

ONDOCKO, STEFAN, JOZEF SVETLIK, TOMAS STEJSKAL, MICHAL SASALA e LUKAS HRIVNIAK. "COMPARISON SELECTED NUMERICAL METHODS FOR THE CALCULATION INVERSE KINEMATICS OF NON-STANDARD MODULAR ROBOTIC ARM CONSISTING OF UNIQUE ROTATIONAL MODULES". MM Science Journal 2021, n. 2 (2 giugno 2021): 4468–73. http://dx.doi.org/10.17973/mmsj.2021_6_2021042.

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The paper compares the most commonly used numerical methods of solving a set of nonlinear equations, especially in terms of computational speed. The methods are applied to a set of nonlinear equations that describe the forward kinematics of a non-standard robotic arm. This arm is an open-loop kinematics chain, composed of special rotary modules. A non-standard feature of the modules is the unlimited rotation around their own axis. This robotic arm consists of six such modules and, thus, has six degrees of freedom. Computations of this nonlinear set of equations are also called inverse kinematics. All computations were performed in Matlab. The same initial conditions, the computation input parameters, and the same structure of the program was used with each method. By applying the below mentioned known methods to the same set, we sought to choose a suitable computation method for the given type of mechanism.

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19

Yao, Yitao, Marshall P. Tulin e Ali R. Kolaini. "Theoretical and experimental studies of three-dimensional wavemaking in narrow tanks, including nonlinear phenomena near resonance". Journal of Fluid Mechanics 276 (10 ottobre 1994): 211–32. http://dx.doi.org/10.1017/s0022112094002533.

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In view of several practical ramifications of this problem, computational-analytical techniques for calculating waves induced by heaving arbitrary bodies in narrow tanks have been developed, including nonlinear wave groups produced near tank resonance. These feature computational near-field solutions matched with appropriate far-field solutions. In the linear case, the far field is provided by linear mode superposition. In the nonlinear case, the far field is described by a suitable nonlinear evolution equation of the cubic Schrödinger type. Matching techniques were developed. Calculations were successfully carried out and the results confirm the important effect of tank walls on added mass and damping.Results of computations have been compared with some data obtained with a conical wavemaker in a narrow tank. Pronounced nonlinear wave groups were obtained near resonance, and these are well reproduced in some detail by the nonlinear theory and computations, without considering any effects of dissipation.The related problem of resonant wave groups produced by a segmented paddle wavemaker has also been treated by analysis and subject to computation, with good general agreement with past experiments. The technique features matching near- and far-field computations using energy considerations.

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20

Whalley, R., M. Ebrahimi e D. Mitchell. "Computation of the series impedance matrix". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 213, n. 8 (1 agosto 1999): 795–809. http://dx.doi.org/10.1243/0954406991522419.

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The series decomposition analysis of impedance matrix models for linear systems of arbitrary degree and dimension using recursive computation is considered. Formulation of the series-admittance description for multi-input, multi-output system models is discussed together with typical applications. A particularly simple, recursive, computationally effective procedure is outlined. Thereafter when, as in most engineering problems, the impedance form results in a matrix quadratic structure, further computational efficiency is possible. Finally, the controllability—observability aspects of series models are investigated and illustrative problems are provided for comparison with conventional assessment procedures.

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Lee, James D., Xianqiao Wang e Youping Chen. "Multiscale Computation for Nano/Micromaterials". Journal of Engineering Mechanics 135, n. 3 (marzo 2009): 192–202. http://dx.doi.org/10.1061/(asce)0733-9399(2009)135:3(192).

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Magalas, Leszek B. "Determination of the Logarithmic Decrement in Mechanical Spectroscopy". Solid State Phenomena 115 (agosto 2006): 7–14. http://dx.doi.org/10.4028/www.scientific.net/ssp.115.7.

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The comparison between the classical methods and a new algorithm OMI used to compute the logarithmic decrement is reported. The OMI algorithm is tested in the computation of the logarithmic decrement from exponentially damped harmonic oscillations. The OMI algorithm yields high precision in the computation of the logarithmic decrement and the resonant frequency, and the smallest dispersion of experimental points.

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Wang, Hua, Peiyu He, Bitao Pang e Xuehai Gao. "A new computational model of large three-row roller slewing bearings using nonlinear springs". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, n. 20 (21 aprile 2017): 3831–39. http://dx.doi.org/10.1177/0954406217704223.

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In order to improve the computational efficiency of load distribution of large three-row roller slewing bearing, a new computational model using nonlinear springs is presented in this paper. In this model, each roller is simulated by a group of nonlinear springs, which has the same load-deformation performance with solid roller–raceway contacts. Thus, equivalent finite element roller–raceway contact models were built to acquire the load-deformation performance and the solid roller experiments were carried out to validate the computational results. Then, the computational accuracy and efficiency using the nonlinear spring-based model were analyzed from three aspects, the maximal contact load, the root mean square errors, and computation time. The results show that a group of parallel springs can be used to replace the solid roller and simulate the line contact performance between the roller and raceway, but an equivalent nonlinear spring is not recommended because of the low computational accuracy, the greater the spring number, the higher the computational accuracy, and the computation time of nonlinear spring-based models is just about 3–4% of time of solid roller-based model, but the model complexity and establishment time of a group of nonlinear springs will increase with the number of springs increasing.

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Jain, Shobhit, e George Haller. "How to compute invariant manifolds and their reduced dynamics in high-dimensional finite element models". Nonlinear Dynamics 107, n. 2 (12 ottobre 2021): 1417–50. http://dx.doi.org/10.1007/s11071-021-06957-4.

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AbstractInvariant manifolds are important constructs for the quantitative and qualitative understanding of nonlinear phenomena in dynamical systems. In nonlinear damped mechanical systems, for instance, spectral submanifolds have emerged as useful tools for the computation of forced response curves, backbone curves, detached resonance curves (isolas) via exact reduced-order models. For conservative nonlinear mechanical systems, Lyapunov subcenter manifolds and their reduced dynamics provide a way to identify nonlinear amplitude–frequency relationships in the form of conservative backbone curves. Despite these powerful predictions offered by invariant manifolds, their use has largely been limited to low-dimensional academic examples. This is because several challenges render their computation unfeasible for realistic engineering structures described by finite element models. In this work, we address these computational challenges and develop methods for computing invariant manifolds and their reduced dynamics in very high-dimensional nonlinear systems arising from spatial discretization of the governing partial differential equations. We illustrate our computational algorithms on finite element models of mechanical structures that range from a simple beam containing tens of degrees of freedom to an aircraft wing containing more than a hundred–thousand degrees of freedom.

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Thilmany, Jean. "How True to Life". Mechanical Engineering 134, n. 09 (1 settembre 2012): 42–45. http://dx.doi.org/10.1115/1.2012-sep-3.

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This article focuses on research underway to build uncertainty into supercomputer simulations of hypersonic flight engines. A team of researchers headquartered at Stanford University is trying to quantify the uncertainty inherent in their supercomputer computations so that engineers can build appropriate tolerances into their designs. The group is investigating hypersonic aircraft, which would fly through the atmosphere at six or twelve times the speed of sound—and in particular the engine that might power such flight. The resulting simulation, scientists believe, will give a more accurate depiction of reality than a simulation that doesn’t correct for computational uncertainty. In the process of conducting their research, group members have created a new computer language that will make it easier to program and run complex simulations on the supercomputers of the future. This programming language of the future separates the computation from the coding.

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Paulon, J., Zhifang Zhang, Pingfang Jia e Jingfei Meng. "Influence of Unsteady Effects on the Measurements in a Transonic Axial Compressor". Journal of Turbomachinery 114, n. 3 (1 luglio 1992): 510–16. http://dx.doi.org/10.1115/1.2929174.

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Interaction phenomena between rotor and stator are unavoidable in advanced compressors and their effects increase with the performance of the turbomachines. Until now, it was not possible to quantify the interaction effects, but with the development of three-dimensional unsteady computation codes in a complete stage, it is possible to know, in detail, the flow field through the machine and to make evident and to explain the difficulties encountered in measuring the flow parameters. A study has been conducted in this way at ONERA, on an axial transonic compressor stage. The computations have been made with a simulation of the losses; in this manner, the overall computed and measured performances of the compressor are the same. A detailed analysis of the unsteady computation results makes evident, between rotor and stator, large variations of some parameters of the flow as a function of time, but also as a function of the axial and tangential relative position of steady probes and stator blades. Unsteady measurements made on another transonic machine confirm the indications given by these computations.

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Qin, Ren, Fengming Yi e Hongguang Wang. "A New Variational Finite Element Computation for the Aerodynamic Inverse Problem in Turbines With Long Blades". Journal of Turbomachinery 110, n. 4 (1 ottobre 1988): 545–48. http://dx.doi.org/10.1115/1.3262229.

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In this paper a new finite element computation for the aerodynamic inverse problem in turbines with long blades is proposed. The influences of blade thickness, blade force, and other factors on aerodynamic parameters may be taken into account. The computational results are compared with those of the finite difference method in noncurvilinear coordinates. They indicate that this method has an appropriate accuracy, good suitability to the complex boundaries, and good convergence. This new finite element computation is a good method for aerodynamic design in turbines with long blades. By use of this method the influence of the various design factors (curved and leaned blades, blade thickness, etc.) on the distributions of the aerodynamic parameters can be studied.

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Mazumder, Sandip. "Modeling Full-Scale Monolithic Catalytic Converters: Challenges and Possible Solutions". Journal of Heat Transfer 129, n. 4 (24 luglio 2006): 526–35. http://dx.doi.org/10.1115/1.2709655.

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Modeling full-scale monolithic catalytic converters using state-of-the-art computational fluid dynamics algorithms and techniques encounters a classical multiscale problem: the channels within the monolith have length scales that are ∼1–2 mm, while the converter itself has a length scale that is ∼5–10 cm. This necessitates very fine grids to resolve all the length scales, resulting in few million computational cells. When complex heterogeneous chemistry is included, the computational problem becomes all but intractable unless massively parallel computation is employed. Two approaches to address this difficulty are reviewed, and their effectiveness demonstrated for the computation of full-scale catalytic converters with complex chemistry. The first approach is one where only the larger scales are resolved by a grid, while the physics at the smallest scale (channel scale) are modeled using subgrid scale models whose development entails detailed flux balances at the “imaginary” fluid–solid interfaces within each computational cell. The second approach makes use of the in situ adaptive tabulation algorithm, after significant reformulation of the underlying mathematics, to accelerate computation of the surface reaction boundary conditions. Preliminary results shown here for a catalytic combustion application involving 19 species and 24 reactions indicate that both methods have the potential of improving computational efficiency by several orders of magnitude.

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Pahlevani, Faranak. "Sensitivity computations of eddy viscosity models with an application in drag computation". International Journal for Numerical Methods in Fluids 52, n. 4 (2006): 381–92. http://dx.doi.org/10.1002/fld.1168.

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Grimberg, Sebastian, e Charbel Farhat. "Fast computation of the wall distance in unsteady Eulerian fluid-structure computations". International Journal for Numerical Methods in Fluids 89, n. 4-5 (11 ottobre 2018): 143–61. http://dx.doi.org/10.1002/fld.4686.

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Roman Čerešňák, Karol Matiaško e Adam Dudáš. "Various Approaches Proposed for Eliminating Duplicate Data in a System". Communications - Scientific letters of the University of Zilina 23, n. 4 (1 ottobre 2021): A223—A232. http://dx.doi.org/10.26552/com.c.2021.4.a223-a232.

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The growth of big data processing market led to an increase in the overload of computation data centers, change of methods used in storing the data, communication between the computing units and computational time needed to process or edit the data. Methods of distributed or parallel data processing brought new problems related to computations with data which need to be examined. Unlike the conventional cloud services, a tight connection between the data and the computations is one of the main characteristics of the big data services. The computational tasks can be done only if relevant data are available. Three factors, which influence the speed and efficiency of data processing are - data duplicity, data integrity and data security. We are motivated to study the problems related to the growing time needed for data processing by optimizing these three factors in geographically distributed data centers.

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Wang, F., F. Sun e B. G. Cao. "Feature fusion of mechanical faults based on evolutionary computation". Insight - Non-Destructive Testing and Condition Monitoring 49, n. 8 (1 agosto 2007): 471–75. http://dx.doi.org/10.1784/insi.2007.49.8.471.

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Cottam, Ron, e Roger Vounckx. "Computation in biological systems as a quantum mechanical simulation". Biosystems 214 (aprile 2022): 104635. http://dx.doi.org/10.1016/j.biosystems.2022.104635.

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Holt, D. F. "The mechanical computation of first and second cohomology groups". Journal of Symbolic Computation 1, n. 4 (dicembre 1985): 351–61. http://dx.doi.org/10.1016/s0747-7171(85)80020-1.

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Renson, L., G. Kerschen e B. Cochelin. "Numerical computation of nonlinear normal modes in mechanical engineering". Journal of Sound and Vibration 364 (marzo 2016): 177–206. http://dx.doi.org/10.1016/j.jsv.2015.09.033.

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Scott, T. C., R. A. Moore, M. B. Monagan, G. J. Fee e E. R. Vrscay. "Perturbative solutions of quantum mechanical problems by symbolic computation". Journal of Computational Physics 87, n. 2 (aprile 1990): 366–95. http://dx.doi.org/10.1016/0021-9991(90)90258-3.

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Ledoux, V., e M. Van Daele. "Automatic computation of quantum-mechanical bound states and wavefunctions". Computer Physics Communications 184, n. 4 (aprile 2013): 1287–96. http://dx.doi.org/10.1016/j.cpc.2012.12.016.

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38

Zeyb Sayyadan, Seyed Mohammad, e Mohammad Mehdi Moniri. "Mechanical behaviors of jammable robotic structures; prediction and computation". International Journal of Intelligent Robotics and Applications 3, n. 1 (10 settembre 2018): 71–86. http://dx.doi.org/10.1007/s41315-018-0067-5.

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39

Keip, Marc-André, e Jörg Schröder. "Notes on the Computation of Effective Electro-Mechanical Moduli". PAMM 9, n. 1 (dicembre 2009): 419–20. http://dx.doi.org/10.1002/pamm.200910183.

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40

Zhu, Z. Q., e X. S. Bai. "The computation of transonic analysis and design". Acta Mechanica 78, n. 1-2 (giugno 1989): 81–94. http://dx.doi.org/10.1007/bf01174002.

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41

Whalley, R., e A. A-Ameer. "The computation of torsional, dynamic stresses". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 223, n. 8 (15 aprile 2009): 1799–814. http://dx.doi.org/10.1243/09544062jmes1215.

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Abstract (sommario):

The torsional dynamics of spatially dispersed, mechanical, power transmission system models are considered. Distributed—lumped parameter modelling methods are employed in the analysis of configurations comprising rotors, bearings, and relatively slender shaft arrangements. Analysis procedures enabling the computation of the torsional shear stress and velocity response of these drive systems are outlined and block diagram representations are formulated. The transient characteristics for shaft—rotor arrangements following deterministic input changes are computed. Typical rotor—shaft assemblies are investigated, illustrating thereby the procedures involved. Graphical results and comparative studies are presented and the generality of the techniques detailed is commented upon.

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42

Pakholik, D. A., A. V. Sobolev e A. S. Shelegov. "Investigation of Check Valve Aerodynamic Characteristics in Different Operating Modes". KnE Engineering 3, n. 3 (21 febbraio 2018): 127. http://dx.doi.org/10.18502/keg.v3i3.1612.

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Abstract (sommario):

The paper presents a computational study of the NPP ventilation system check valve aerodynamics, namely, a numerical simulation of the air flowing through the open valve with the subsequent determination of the relationship between the reactive torque acting on the valve closure axles and the input air velocity.This numerical simulation of the air flowing through the check valve was performed using the ANSYS CFX program. In the computation, different operating modes of the check valve were considered when the air flow was passing through it. The valve operating modes were set depending on changes in the input air velocity. As a result of aerodynamic computation, the values of pressure and velocity components were obtained over the entire valve volume.Reactive forces were calculated in the ANSYS Mechanical program. The reactive forces acting on the valve body form a torque at the gate axles. When adjusting the check valve to the actual flow rate, it is necessary to know this torque value and compensate for it. As a result of a series of computations of reactive forces, a relationship was found between the torque value of the valve’s working element axles and the input air velocity.

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43

Yu, Liang, Qixin Guo, Rui Wang, Minyan Shi, Fucheng Yan e Ran Wang. "Dynamic Offloading Loading Optimization in Distributed Fault Diagnosis System with Deep Reinforcement Learning Approach". Applied Sciences 13, n. 7 (23 marzo 2023): 4096. http://dx.doi.org/10.3390/app13074096.

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Abstract (sommario):

Artificial intelligence and distributed algorithms have been widely used in mechanical fault diagnosis with the explosive growth of diagnostic data. A novel intelligent fault diagnosis system framework that allows intelligent terminals to offload computational tasks to Mobile edge computing (MEC) servers is provided in this paper, which can effectively address the problems of task processing delays and enhanced computational complexity. As the resources at the MEC and intelligent terminals are limited, performing reasonable resource allocation optimization can improve the performance, especially for a multi-terminals offloading system. In this study, to minimize the task computation delay, we jointly optimize the local content splitting ratio, the transmission/computation power allocation, and the MEC server selection under a dynamic environment with stochastic task arrivals. The challenging dynamic joint optimization problem is formulated as a reinforcement learning (RL) problem, which is designed as the computational offloading policies to minimize the long-term average delay cost. Two deep RL strategies, deep Q-learning network (DQN) and deep deterministic policy gradient (DDPG), are adopted to learn the computational offloading policies adaptively and efficiently. The proposed DQN strategy takes the MEC selection as a unique action while using the convex optimization approach to obtain the local content splitting ratio and the transmission/computation power allocation. Simultaneously, the actions of the DDPG strategy are selected as all dynamic variables, including the local content splitting ratio, the transmission/computation power allocation, and the MEC server selection. Numerical results demonstrate that both proposed strategies perform better than the traditional non-learning schemes. The DDPG strategy outperforms the DQN strategy in all simulation cases exhibiting minimal task computation delay due to its ability to learn all variables online.

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44

Corthout, Ruben, Chris M. J. Tampère e Lambertus H. Immers. "Marginal Incident Computation". Transportation Research Record: Journal of the Transportation Research Board 2099, n. 1 (gennaio 2009): 22–29. http://dx.doi.org/10.3141/2099-03.

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45

Ghosh, K., Y. Naresh e N. Srichakradhar Reddy. "A Theoretical Investigation on the Dimensions and Annealing Effects of InAs/GaAs Quantum Dots for Device Applications at High Bit-Rate Optical Transmission Window of 1.3-1.55 μm". Advanced Materials Research 584 (ottobre 2012): 423–27. http://dx.doi.org/10.4028/www.scientific.net/amr.584.423.

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Abstract (sommario):

In this paper, we present theoretical model and computations for tuning the photoluminescence (PL) emission of InAs/GaAs quantum dots at 1.3 -1.55 μm by optimizing its height and base dimensions through quantum mechanical concepts. Simulation on the annealing induced compositional change in the QDs was carried out using Fick’s diffusion model. Results from our computation illustrated that lower base size of 10 nm and larger height QDs of 5.1 nm can be effectively utilized for extending the PL emission to longer wavelengths with minimal blue-shift on annealing. This highlights the potential of our model and computation to assist in precisely engineering the optical properties of QD materials for specific device applications.

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46

Meng, Xi Hui, Xiao Yu Ma e Xiao Ya Zheng. "Numerical Computation for Effective Mechanical Properties of Honeycomb Core Structure". Advanced Materials Research 912-914 (aprile 2014): 460–65. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.460.

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Abstract (sommario):

This paper combined the homogenization method with finite element method. The equivalent mechanical coefficients of the hexagonal aluminum honeycomb core were computed on ABAQUS platform by developing the user subroutine UEXPAN ( ) and Python script file. The results obtained with homogenization method were compared with those obtained with energy method, and it showed the feasibility of homogenization method. Then the effects of thickness-to-length ratio t/l on equivalent mechanical coefficients were taken into account. The results suggested that the equivalent in-plane mechanical parameters vary non-linearly with respect to t/l, while the equivalent out-of-plane mechanical parameters vary linearly with respect to t/l, which will provide reference for optimizing the design of honeycomb core structure.

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47

Gerolymos, G. A., e I. Vallet. "Robust Implicit Multigrid Reynolds-Stress Model Computation of 3D Turbomachinery Flows". Journal of Fluids Engineering 129, n. 9 (31 marzo 2007): 1212–27. http://dx.doi.org/10.1115/1.2754320.

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Abstract (sommario):

The purpose of this paper is to present a numerical methodology for the computation of complex 3D turbomachinery flows using advanced multiequation turbulence closures, including full seven-equation Reynolds-stress transport models. The flow equations are discretized on structured multiblock grids, using an upwind biased (O[ΔxH3]MUSCL reconstruction) finite-volume scheme. Time integration uses a local dual-time-stepping implicit procedure, with internal subiterations. Computational efficiency is achieved by a specific approximate factorization of the implicit subiterations, designed to minimize the computational cost of the turbulence transport equations. Convergence is still accelerated using a mean-flow-multigrid full-approximation-scheme method, where multigrid is applied only on the mean-flow variables. Speed-ups of a factor 3 are obtained using three levels of multigrid (fine plus two coarser grids). Computational examples are presented using two Reynolds-stress models, and also a baseline k−ε model, for various turbomachinery configurations, and compared to available experimental measurements.

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48

Yang, Fan, Zhufeng Yue e Lei Li. "The aeroelastic characteristics of high aspect ratio wing". Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 230, n. 14 (6 agosto 2016): 2543–56. http://dx.doi.org/10.1177/0954410016629497.

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Abstract (sommario):

Owing to the elasticity, the large deformation was brought in the high aspect ratio wing in the flight. The large deformation had a great influence on the flight performance. In this paper, the loosely coupled method was used for the research of high aspect ratio wing aeroelastic problems. The Navier–Stokes equations were solved for fluid domain computation, and the nonlinear finite element method was adopted for solid domain computation. The data exchange program and mesh regeneration progress were adopted for fluid–structure interface problem. Finally, the aerodynamic characteristics of high aspect ratio wing were obtained under different fly conditions. In addition, to validate the proposed method, the flutter analysis of AGARD 445.6 wing is carried out and compared with the experimental data. The numerical result validates the proposed computational fluid dynamics/computational structural mechanics method.

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49

Lissner, Jonah. "Quantum mechanical methods for advancement of hydrophysical engineering". Engineering and Applied Science Letters 3, n. 4 (2 dicembre 2020): 55–59. http://dx.doi.org/10.30538/psrp-easl2020.0051.

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50

Lin, Frank K. T., G. J. Hwang, S. C. Wong e C. Y. Soong. "Numerical Computation of Turbulent Flow and Heat Transfer in a Radially Rotating Channel with Wall Conduction". International Journal of Rotating Machinery 7, n. 3 (2001): 209–22. http://dx.doi.org/10.1155/s1023621x01000197.

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Abstract (sommario):

This work is concerned with numerical computation of turbulent flow and heat transfer in experimental models of a radially rotating channel used for turbine blade cooling. Reynolds-averaged Navier-Stokes and energy equations with a two-layer turbulence model are employed as the computational model of the flow and temperature fields. The computations are carried out by the software package of “CFX-TASCflow”. Heat loss from the channel walls through heat conduction is considered. Results at various rotational conditions are obtained and compared with the baseline stationary cases. The influences of the channel rotation, through-flow, wall conduction and the channel extension on flow and heat transfer characteristics are explored. Comparisons of the present predictions and available experimental data are also presented.

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