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Articoli di riviste sul tema "Stochastic accelerations"

Autore: Grafiati

Pubblicato: 7 luglio 2024

Ultima modifica: 31 luglio 2025

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1

Borgas, M. S., and B. L. Sawford. "A family of stochastic models for two-particle dispersion in isotropic homogeneous stationary turbulence." Journal of Fluid Mechanics 279 (November 25, 1994): 69–99. http://dx.doi.org/10.1017/s0022112094003824.

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A family of Lagrangian stochastic models for the joint motion of particle pairs in isotropic homogeneous stationary turbulence is considered. The Markov assumption and well-mixed criterion of Thomson (1990) are used, and the models have quadratic-form functions of velocity for the particle accelerations. Two constraints are derived which formally require that the correct one-particle statistics are obtained by the models. These constraints involve the Eulerian expectation of the ‘acceleration’ of a fluid particle with conditioned instantaneous velocity, given either at the particle, or at some

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2

Ding, Yanqiong, Yongbo Peng, and Jie Li. "A Stochastic Semi-Physical Model of Seismic Ground Motions in Time Domain." Journal of Earthquake and Tsunami 12, no. 03 (2018): 1850006. http://dx.doi.org/10.1142/s1793431118500069.

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A stochastic function model of seismic ground motions is presented in this paper. It is derived from the consideration of physical mechanisms of seismic ground motions. The model includes the randomness inherent in the seismic source, propagation path and local site. For logical selection of the seismic acceleration records, a cluster analysis method is employed. Statistical distributions of the random parameters associated with the proposed model are identified using the selected data. Superposition method of narrow-band wave groups is then adopted to simulate non-stationary seismic ground mo

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3

Kelly, Patrick, Manoranjan Majji, and Felipe Guzmán. "Estimation and Error Analysis for Optomechanical Inertial Sensors." Sensors 21, no. 18 (2021): 6101. http://dx.doi.org/10.3390/s21186101.

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A sensor model and methodology to estimate the forcing accelerations measured using a novel optomechanical inertial sensor with the inclusion of stochastic bias and measurement noise processes is presented. A Kalman filter for the estimation of instantaneous sensor bias is developed; the outputs from this calibration step are then employed in two different approaches for the estimation of external accelerations applied to the sensor. The performance of the system is demonstrated using simulated measurements and representative values corresponding to a bench-tested 3.76 Hz oscillator. It is sho

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4

Guo, Xiangying, Changkun Li, Zhong Luo, and Dongxing Cao. "Modal Parameter Identification of Structures Using Reconstructed Displacements and Stochastic Subspace Identification." Applied Sciences 11, no. 23 (2021): 11432. http://dx.doi.org/10.3390/app112311432.

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A method of modal parameter identification of structures using reconstructed displacements was proposed in the present research. The proposed method was developed based on the stochastic subspace identification (SSI) approach and used reconstructed displacements of measured accelerations as inputs. These reconstructed displacements suppressed the high-frequency component of measured acceleration data. Therefore, in comparison to the acceleration-based modal analysis, the operational modal analysis obtained more reliable and stable identification parameters from displacements regardless of the

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5

Nava, F. Alejandro. "Assessment of possible peak accelerations through stochastic variations." Terra Nova 3, no. 3 (1991): 289–93. http://dx.doi.org/10.1111/j.1365-3121.1991.tb00146.x.

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6

de Jager, Cornells, Joost Carpay, Alex de Koter, Hans Nieuwenhuijzen, and Erik Schellekens. "Atmospheric dynamics of luminous stars." International Astronomical Union Colloquium 113 (1989): 211–20. http://dx.doi.org/10.1017/s0252921100004474.

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AbstractA review is given of data and theories on the motion fields in super and hypergiants with special reference to LBV’s. We show that the radiative momentum flux is incapable of driving the episodical bursts of mass loss of these stars, and that there are several indications that the LBV-phenomenon is hydrodynamically driven. The sum of turbulent and radiative accelerations in the atmospheres of the most luminous stars compensates the gravitational acceleration for stars near the Humphreys-Davidson limit. This explains their atmospheric near-instability. The motion field in the atmosphere

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7

Vajedi, S., K. Gustavsson, B. Mehlig, and L. Biferale. "Inertial-particle accelerations in turbulence: a Lagrangian closure." Journal of Fluid Mechanics 798 (May 31, 2016): 187–200. http://dx.doi.org/10.1017/jfm.2016.305.

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The distribution of particle accelerations in turbulence is intermittent, with non-Gaussian tails that are quite different for light and heavy particles. In this article we analyse a closure scheme for the acceleration fluctuations of light and heavy inertial particles in turbulence, formulated in terms of Lagrangian correlation functions of fluid tracers. We compute the variance and the flatness of inertial-particle accelerations and we discuss their dependency on the Stokes number. The closure incorporates effects induced by the Lagrangian correlations along the trajectories of fluid tracers

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8

Yan, Guang Hui, and Shuo Zhang. "Research on Modeling and Optimization Control of Heavy Truck Cab Active Suspension System." Applied Mechanics and Materials 687-691 (November 2014): 359–62. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.359.

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In order to meet the ride comfort of the heavy truck cab, the 1/2 heavy truck cab active suspension model established. Based on this model the LQG optimization control was selected for the active control of a 1/2 heavy truck cab suspension system. The road disturbance is integral white noise stochastic signal. By the example simulation in Matlab/Simulink, the results show that the cab active suspension with LQG control strategy can decrease the vertical accelerations, the roll angle and roll angle acceleration of the truck cab, the active suspension can improve both the ride comfort and drivin

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9

Kelly, Mark. "Flow acceleration statistics: a new paradigm for wind-driven loads, towards probabilistic turbine design." Wind Energy Science 10, no. 3 (2025): 535–58. https://doi.org/10.5194/wes-10-535-2025.

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Abstract. A method is developed to identify load-driving events based on filtered flow acceleration, regardless of the event-generating mechanism or specific temporal signature. Low-pass filtering enables calculation of acceleration statistics per characteristic turbine response time; this circumvents the classic problem of small-scale noise dominating observed accelerations or extremes, while providing a way to deal with different turbines and controllers. Not only is the flow acceleration physically meaningful, but its use also removes the need for de-trending. Through consideration of the 9

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10

Chen, Na, Meng Wang, Tom Alkim, and Bart van Arem. "A Robust Longitudinal Control Strategy of Platoons under Model Uncertainties and Time Delays." Journal of Advanced Transportation 2018 (2018): 1–13. http://dx.doi.org/10.1155/2018/9852721.

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Automated vehicles are designed to free drivers from driving tasks and are expected to improve traffic safety and efficiency when connected via vehicle-to-vehicle communication, that is, connected automated vehicles (CAVs). The time delays and model uncertainties in vehicle control systems pose challenges for automated driving in real world. Ignoring them may render the performance of cooperative driving systems unsatisfactory or even unstable. This paper aims to design a robust and flexible platooning control strategy for CAVs. A centralized control method is presented, where the leader of a

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11

Haerendel, Gerhard. "Magnetic energy conversion in the Corona and Magnetosphere." Highlights of Astronomy 10 (1995): 302. http://dx.doi.org/10.1017/s1539299600011278.

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Five different categories of magnetic energy conversion will be discussed, and their manifestations in the ionosphere-magnetosphere and chromosphere - corona will be compared. They are: (1) Ohmic dissipation of d.c. currents, (2) Damping of Alfvén waves, (3) Magnetic pumping, (4) Reconnection, and (5) Electrostatic acceleration parallel B. Manifestations are: (1) Ionospheric heating by Peder sen currents and generation of chromospheric faculae and plages by dissipation of field-aligned currents; (2) Generation of spicules by collisional damping of Alfvén-waves and Alfvén-wave damping in the co

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12

Zheng, Wei, Juan Han, Weijie Kong, and Lixiang Wang. "Group-SMA Algorithm Based Joint Estimation of Train Parameter and State." PROMET - Traffic&Transportation 27, no. 1 (2015): 85–95. http://dx.doi.org/10.7307/ptt.v27i1.1499.

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The braking rate and train arresting operation is important in the train braking performance. It is difficult to obtain the states of the train on time because of the measurement noise and a long calculation time. A type of Group Stochastic M-algorithm (GSMA) based on Rao-Blackwellization Particle Filter (RBPF) algorithm and Stochastic M-algorithm (SMA) is proposed in this paper. Compared with RBPF, GSMA based estimation precisions for the train braking rate and the control accelerations were improved by 78% and 62%, respectively. The calculation time of the GSMA was decreased by 70% compared

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13

Avendaño-Valencia, Luis David, and Spilios D. Fassois. "Generalized Stochastic Constraint TARMA Models for In-Operation Identification of Wind Turbine Non-Stationary Dynamics." Key Engineering Materials 569-570 (July 2013): 587–94. http://dx.doi.org/10.4028/www.scientific.net/kem.569-570.587.

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The identification of the operational Wind Turbine (WT) dynamics is a challenging problem, due to both the complex dynamics and the non-stationarity of the vibration response. In this study the novel class of Generalized Stochastic Constraint (GSC) Time-dependent ARMA models is used for the identification of the non-stationary characteristics of acceleration vibration signals acquired in the tower top of an operating WT, in the fore-aft and lateral directions. The results demonstrate the improved performance of GSC-TARMA models compared to their conventional Smoothness Priors (SP) and Function

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14

Ariaratnam, S. T., and K. C. K. Leung. "Parametric effect of vertical ground acceleration on the earthquake response of elastic structures." Canadian Journal of Civil Engineering 17, no. 2 (1990): 209–17. http://dx.doi.org/10.1139/l90-026.

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An analytical procedure is presented for the calculation of the statistical properties of the response of a linear elastic tall building under earthquake excitation. Emphasis is placed on the effect of the vertical ground motion. The restoring force in each story of the structural model is assumed to arise from the bending deformation of the columns whose rigidities are subjected to a general reduction due to the combined action of gravitational forces and the random variations due to vertical ground acceleration. Since earthquakes are random phenomena, stochastic modelling of ground motion se

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15

Picozzi, V., A. M. Avossa, and F. Ricciardelli. "Codifiable probability-based model for footbridges response to random walkers." Journal of Physics: Conference Series 2647, no. 12 (2024): 122011. http://dx.doi.org/10.1088/1742-6596/2647/12/122011.

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Abstract The response to the transient action of a single pedestrian or a small group of pedestrians is required for the serviceability assessment of human-induced footbridge vibrations. The approach adopted by standards and guidelines is proved to lead to a non-uniform level of reliability. This is in contrast with both the stochastic nature of pedestrian gait parameters and the probabilistic approach adopted by modern structural codes. In this paper, firstly the analysis of peak accelerations is developed according to the Eurocode for a number of simply-supported footbridges, both in vertica

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16

Ruiz, X., P. Bitlloch, L. Ramírez-Piscina, and J. Casademunt. "Impact of stochastic accelerations on dopant segregation in microgravity semiconductor crystal growth." Journal of Crystal Growth 355, no. 1 (2012): 88–100. http://dx.doi.org/10.1016/j.jcrysgro.2012.06.027.

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17

Zuo, Qing Lin, Li Chang Wang, and Da Hai Ji. "Vibration Test and Stochastic Analysis of Large-Span Cantilevered Floor." Applied Mechanics and Materials 188 (June 2012): 130–36. http://dx.doi.org/10.4028/www.scientific.net/amm.188.130.

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With the study of the 3rd conference hall of Dalian International Conference Center, test and relevant calculation are applied to the structural natural frequency and floor vibration due to human excitations. The Monte Carlo stochastic analysis is applied to the cases in which the comfort for vibration due to crowd excitations may exceed the limit. The results show that the Monte Carlo stochastic method and load curves of excitations are reliable, but in the actual test the high-order harmonic effect of walking excitation is not obvious. In the stochastic analysis with the closer frequency and

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18

Ágh, Csaba. "Comparative Analysis of Axlebox Accelerations in Correlation with Track Geometry Irregularities." Acta Technica Jaurinensis 12, no. 2 (2019): 161–77. http://dx.doi.org/10.14513/actatechjaur.v12.n2.501.

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Stochastic track irregularities influence additional dynamic forces developed in the vehicle-track interaction that lead to faster deterioration of track. For economical track maintenance it is important to understand the relationship between the irregularities recorded by conventional track geometry measuring car and the resulting dynamic vehicle responses. This paper focuses on the correlation between lateral and vertical axlebox accelerations and differently processed track geometry parameters based on a real measurement run on straight track. Decolouring of chord-offset measurement results

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19

Murböck, Michael, Petro Abrykosov, Christoph Dahle, Markus Hauk, Roland Pail, and Frank Flechtner. "In-Orbit Performance of the GRACE Accelerometers and Microwave Ranging Instrument." Remote Sensing 15, no. 3 (2023): 563. http://dx.doi.org/10.3390/rs15030563.

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The Gravity Recovery and Climate Experiment (GRACE) satellite mission has provided global long-term observations of mass transport in the Earth system with applications in numerous geophysical fields. In this paper, we targeted the in-orbit performance of the GRACE key instruments, the ACCelerometers (ACC) and the MicroWave ranging Instrument (MWI). For the ACC data, we followed a transplant approach analyzing the residual accelerations from transplanted accelerations of one of the two satellites to the other. For the MWI data, we analyzed the post-fit residuals of the monthly GFZ GRACE RL06 s

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20

Villani, Manuela, Barbara Polidoro, Rory McCully, et al. "A Selection of GMPEs for the United Kingdom Based on Instrumental and Macroseismic Datasets." Bulletin of the Seismological Society of America 109, no. 4 (2019): 1378–400. http://dx.doi.org/10.1785/0120180268.

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Abstract In countries with low‐to‐moderate seismicity, the selection of appropriate ground‐motion prediction equations (GMPEs) to be used in a probabilistic seismic hazard analysis (PSHA) is a challenging step. Empirical observations of ground motion are limited, and GMPEs, when available, are generally based on stochastic simulations or adjusted empirical GMPEs from elsewhere. This article investigates the suitability of recent GMPEs to the United Kingdom. To this end, the spectral accelerations obtained from available instrumental ground‐motion data in the United Kingdom with magnitude lower

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21

Venglár, Michal, and Katarína Lamperová. "Effect of the Temperature on the Modal Properties of a Steel Railroad Bridge." Slovak Journal of Civil Engineering 29, no. 1 (2021): 1–8. http://dx.doi.org/10.2478/sjce-2021-0001.

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Abstract The article is devoted to a study of the impact of various environmental conditions on modal parameters, such as natural frequencies and damping ratios. The modal analysis has been performed using the Stochastic Subspace Identification (SSI) method of measuring data every month on the same steel bridge structures located on an important railroad route from Prague (the Czech Republic) to Košice (Slovakia). The structure is approximately 60 m long, and the bearing structure is formed by two arch trusses. The bridge was exposed to ambient vibrations as well as to vibrations caused by a t

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22

Wald, D., P. G. Somerville, and L. J. Burdick. "The Whittier Narrows, California Earthquake of October 1, 1987—Simulation of Recorded Accelerations." Earthquake Spectra 4, no. 1 (1988): 139–56. http://dx.doi.org/10.1193/1.1585469.

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We have simulated accelerograms from many of the strong motion stations close to the mainshock of the 1987 Whittier Narrows earthquake using a semi-empirical Green's function summation technique. This method allows gross aspects of the source rupture process to be treated deterministically using a kinematic model based on first motion studies, teleseismic modeling and the distribution of aftershocks. Stochastic aspects of the rupture process are then included to simulate irregularity in both rupture and slip velocity. Gross aspects of wave propagation are modeled using theoretical Green's func

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23

Hu, Zhaohui, and Dongbin Zhao. "Adaptive Cruise Control Based on Reinforcement Leaning with Shaping Rewards." Journal of Advanced Computational Intelligence and Intelligent Informatics 15, no. 3 (2011): 351–56. http://dx.doi.org/10.20965/jaciii.2011.p0351.

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This paper proposes a Supervised Reinforcement Learning (SRL) algorithm for the Adaptive Cruise Control system (ACC) to comply with human driving habit, which can be thought of as a dynamic programming problem with stochastic demands. In short, the ACC problem can be deemed as the host vehicle adopting different control parameters (accelerations in the upper controller, brakes and throttles in the bottom controller) in the process of following or other driving situations according to the driver’s behavior. We discretize the relative speed as well as the relative distance to construct the two-d

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24

Wang, Nan, Rumi Takedatsu, Kim B. Olsen, and Steven M. Day. "Broadband Ground‐Motion Simulation with Interfrequency Correlations." Bulletin of the Seismological Society of America 109, no. 6 (2019): 2437–46. http://dx.doi.org/10.1785/0120190136.

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Abstract Ground‐motion simulations can be viable alternatives to empirical relations for seismic hazard analysis when data are sparse. Interfrequency correlation is revealed in recorded seismic data, which has implications for seismic risk (Bayless and Abrahamson, 2018a). However, in many cases, simulated ground‐motion time series, in particular those originating from stochastic methods, lack interfrequency correlation. Here, we develop a postprocessing method to rectify simulation techniques that otherwise produce synthetic time histories deficient in an interfrequency correlation structure.

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25

Bae, Gihwan, and Yoshiyuki Suzuki. "Stochastic Identification of Building Structure using Response Accelerations of the 1995 Hyogoken-Nanbu Earthquake." Proceedings of the ISCIE International Symposium on Stochastic Systems Theory and its Applications 1996 (May 5, 1996): 19–24. http://dx.doi.org/10.5687/sss.1996.19.

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26

Pimenta, Francisco, João Pacheco, Sérgio Pereira, and Filipe Magalhães. "Reconstructing the bending moments time history of wind turbine tower from acceleration measurements using Gaussian processes." Journal of Physics: Conference Series 2265, no. 3 (2022): 032080. http://dx.doi.org/10.1088/1742-6596/2265/3/032080.

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Abstract The proper estimation of the fatigue damage accumulated over time for a given wind turbine is a key information when evaluating the remaining lifetime of the structure. While the most obvious way to do so is to instrument the structure with strain gauges, not only this is a demanding task, it also only provides information about the sections that are being monitored. In this work we propose a new methodology to estimate the fatigue damage in any section of the tower based on the accelerations time series and a single instrumented section with strain gauges. We argue that accelerations

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27

Cao, Hui, and Tong Liu. "Damage Identification of Beams Based on Improved Element Damage Variable with Reconstructed Modal Rotations." International Journal of Computational Methods 12, no. 04 (2015): 1540007. http://dx.doi.org/10.1142/s0219876215400071.

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Damage identification of structures is always attractive to researchers because it plays an important role in the health monitoring in many civil engineering structures. When carrying out a health monitoring, sensors are usually laid on a beam to record acceleration signals, in which the modes of the beam can be extracted to construct indicators for detecting damage of the investigated beam. It should be noted that it is difficult to measure rotational signals of the beam at a position where sensors are laid, thus only the modal translations are available. Although the modal translations can b

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28

Osei, Jack Banahene, Mark Adom-Asamoah, Ahmed Ali Awadallah Ahmed, and Eugene Boasiako Antwi. "Monte Carlo Based Seismic Hazard Model for Southern Ghana." Civil Engineering Journal 4, no. 7 (2018): 1510. http://dx.doi.org/10.28991/cej-0309191.

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Seismic hazard assessment involves quantifying the likely ground motion intensities to be expected at a particular site or region. It is a crucial aspect of any seismic hazard mitigation program. The conventional probabilistic seismic hazard assessment is highly reliant on the past seismic activities in a particular region. However, for regions with lower rates of seismicity, where seismological data is scanty, it would seem desirable to use a stochastic modelling (Monte Carlo based) approach. This study presents a Monte Carlo simulation hazard model for Southern Ghana. Six sites are selected

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29

Zhu, Jian, and Ping Tan. "Vulnerability Analysis of Small High-Rise Shear Wall Buildings." Advanced Materials Research 255-260 (May 2011): 416–20. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.416.

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In order to evaluate seismic reliability and vulnerability of the typical small high-rise shear wall buildings in Western China region, the sample finite element analytical small high-rise shear wall structure has been built in considering of fiber element model and fiber wall element model. Meantime stochastic response spectrum of accelerations with 5% damping ratio have being set up based on China Seismic Code as input seismic excitation, dynamic history analysis was being used to determine earthquake resistant capability of sample structures. Vulnerability curves of four performance levels

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30

Reynolds, Andy. "Swarming Insects May Have Finely Tuned Characteristic Reynolds Numbers." Biomimetics 9, no. 11 (2024): 660. http://dx.doi.org/10.3390/biomimetics9110660.

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Over the last few years, there has been much effort put into the development and validation of stochastic models of the trajectories of swarming insects. These models typically assume that the positions and velocities of swarming insects can be represented by continuous jointly Markovian processes. These models are first-order autoregressive processes. In more sophisticated models, second-order autoregressive processes, the positions, velocities, and accelerations of swarming insects are collectively Markovian. Although it is mathematically conceivable that this hierarchy of stochastic models

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Bittner, M., L. Fritsch, B. Hirzinger, M. Broggi, and M. Beer. "Efficient time-dependent reliability analysis for a railway bridge model." Journal of Physics: Conference Series 2647, no. 6 (2024): 062002. http://dx.doi.org/10.1088/1742-6596/2647/6/062002.

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Abstract This paper proposes a framework for efficient time-dependent reliability analysis for a parametrized stochastic dynamic system, namely a train bridge load model with uncertain design properties. The Probability Density Evolution Method is utilized to explore the multidimensional random space, identify specific failure paths contributing to the failure region, and provide a full probabilistic output of the desired target quantity. The framework is tested on an uncertain railway bridge subjected to train transit (moving loads). The peak acceleration as a function of the train speed in a

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32

Gerlici, Juraj, Olena Nozhenko, Ganna Cherniak, Mykola Gorbunov, Rostyslav Domin, and Tomáš Lack. "The development of diagnostics methodological principles of the railway rolling stock on the basis of the analysis of dynamic vibration processes of the rail." MATEC Web of Conferences 157 (2018): 03007. http://dx.doi.org/10.1051/matecconf/201815703007.

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The paper discusses the preconditions of the methodology development of diagnosis system for assessing dynamic impact of the rolling stock on the basis of processing and analysis of data obtained in operation on the results of measurement of parameters that characterize dynamic vibration processes of the mechanical system of “rolling stock – track”. On the basis of usage of the processing methods of time series and stochastic processes there has been established the relationship between these dynamic processes and wheel defects, and designed experimental data processing algorithms, which in th

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Stokes, C. L., D. A. Lauffenburger, and S. K. Williams. "Migration of individual microvessel endothelial cells: stochastic model and parameter measurement." Journal of Cell Science 99, no. 2 (1991): 419–30. http://dx.doi.org/10.1242/jcs.99.2.419.

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Analysis of cell motility effects in physiological processes can be facilitated by a mathematical model capable of simulating individual cell movement paths. A quantitative description of motility of individual cells would be useful, for example, in the study of the formation of new blood vessel networks in angiogenesis by microvessel endothelial cell (MEC) migration. In this paper we propose a stochastic mathematical model for the random motility and chemotaxis of single cells, and evaluate migration paths of MEC in terms of this model. In our model, cell velocity under random motility condit

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Zhang, Rui, and Yimin Zhang. "Dynamic model and analysis of the traction unit gear system in long wall coal shearer." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 234, no. 3 (2020): 546–67. http://dx.doi.org/10.1177/1464419320913698.

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The present work contributes to the analysis of dynamic behavior of long wall coal shearer traction unit through dynamic model of geared drives. In contrast to the majority of the models in the literature, complete machine dynamic model of coal shearer is introduced for obtaining dynamic gear loads for traction unit. A new stochastic coal cutting loads model is presented. Predicted vibration accelerations were compared with coal cutting experiments. It is demonstrated that the predictions match very well with experimental data. Forced vibrations of traction unit gear system are studied to inve

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Cesare, Valentina. "Dark Coincidences: Small-Scale Solutions with Refracted Gravity and MOND." Universe 9, no. 1 (2023): 56. http://dx.doi.org/10.3390/universe9010056.

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General relativity and its Newtonian weak field limit are not sufficient to explain the observed phenomenology in the Universe, from the formation of large-scale structures to the dynamics of galaxies, with the only presence of baryonic matter. The most investigated cosmological model, the ΛCDM, accounts for the majority of observations by introducing two dark components, dark energy and dark matter, which represent ∼95% of the mass-energy budget of the Universe. Nevertheless, the ΛCDM model faces important challenges on the scale of galaxies. For example, some very tight relations between the

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Seok, Jihoon, and Jeeho Lee. "Stochastic Generation of Peak Ground Accelerations Based on Single Seismic Event Data for Safety Assessment of Structures." Applied Sciences 14, no. 21 (2024): 10031. http://dx.doi.org/10.3390/app142110031.

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The Korean Peninsula, characterized by low-to-moderate seismicity, faces a shortage of strong ground motion records, posing challenges for the seismic safety assessment of critical infrastructures. Given the rarity of large-magnitude earthquakes, generating a variety of earthquakes with rational values of Peak Ground Acceleration (PGA) is essential for robust seismic fragility and risk analysis. To address this, a new stochastic approach is proposed to simulate artificial earthquakes at multiple source-to-site distances and derive the probability distribution of PGA based on recorded data from

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Botshekan, Meshkat, Erfan Asaadi, Jake Roxon, Franz-Josef Ulm, Mazdak Tootkaboni, and Arghavan Louhghalam. "Smartphone-enabled road condition monitoring: from accelerations to road roughness and excess energy dissipation." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 477, no. 2246 (2021): 20200701. http://dx.doi.org/10.1098/rspa.2020.0701.

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We develop a framework to address the shortcomings of current smartphone-based approaches for road roughness sensing and monitoring through combining vehicle dynamics, random vibration theory and a two-layer inverse analysis. The proposed approach uses in-cabin recordings of the vehicle’s vertical acceleration measured by a smartphone positioned inside the car for the estimation of road roughness. The mechanistic road roughness–vehicle interaction model at the core of the proposed framework links the frequency spectrum of the vehicle’s vertical acceleration to the road roughness power spectral

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Lasser, Martin, Ulrich Meyer, Daniel Arnold, and Adrian Jäggi. "Stochastic noise modelling of kinematic orbit positions in the Celestial Mechanics Approach." Advances in Geosciences 50 (October 20, 2020): 101–13. http://dx.doi.org/10.5194/adgeo-50-101-2020.

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Abstract. Gravity field models may be derived from kinematic orbit positions of Low Earth Orbiting satellites equipped with onboard GPS (Global Positioning System) receivers. An accurate description of the stochastic behaviour of the kinematic positions plays a key role to calculate high quality gravity field solutions. In the Celestial Mechanics Approach (CMA) kinematic positions are used as pseudo-observations to estimate orbit parameters and gravity field coefficients simultaneously. So far, a simplified stochastic model based on epoch-wise covariance information, which may be efficiently d

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Semak, Matthew R., Jeremiah Schwartz, and Gary Heise. "Examining Human Unipedal Quiet Stance: Characterizing Control through Jerk." Computational and Mathematical Methods in Medicine 2020 (January 4, 2020): 1–15. http://dx.doi.org/10.1155/2020/5658321.

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We investigated the quality of smoothness during human unipedal quiet stance. Smoothness is quantified by the time rate of change of the accelerations, or jerks, associated with the motion of the foot and can be seen as an indicative of how controlled the balance process is. To become more acquainted with this as a quantity, we wanted to establish whether or not it can be modeled as a (stationary) stochastic process and, if so, explore its temporal scaling behavior. Specifically, our study focused on the jerk concerning the center-of-pressure (COP) for each foot. Data were collected via a forc

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Gorini, Antonella, Sandro Marcucci, Paolo Marsan, and Giuliano Milana. "Strong Motion Records of the 2002 Molise, Italy, Earthquake Sequence and Stochastic Simulation of the Main Shock." Earthquake Spectra 20, no. 1_suppl (2004): 65–79. http://dx.doi.org/10.1193/1.1764784.

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The far field radiation inferred from accelerometric data recorded by the Italian Strong Motion Network (RAN) during the October 31, 2002, Molise, Italy, earthquake indicates a strong anisotropy in PGA distribution that presents its maximum values in the eastern part of the epicentral area. This study explores an interpretation of source directivity using a stochastic approach to produce synthetic seismograms accounting for source dimensions and rupture evolution. An E-W strike-slip fault, with a dip close to 90° and a fault plane size of (8×6) km2, reproduces satisfactorily both peak accelera

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Decký, Martin, Matúš Kováč, and Peter Kotek. "The Comparison of Measured and Simulated Dynamic Responses of Vehicles Indicated by Road Pavement Unevenness." Civil and Environmental Engineering 11, no. 1 (2015): 10–20. http://dx.doi.org/10.1515/cee-2015-0002.

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Abstract The article presents the comparison of measured and simulated dynamic responses of heavy vehicle which are indicated by road pavement unevenness. This unevenness was represented by speed control bumps, potholes and stochastic pavement unevenness. The objective simulations were realized through the medium Quarter- Car Simulation by means of application of simulated theory of dynamic systems. The reliability of used model was verificated with comparison of measured and simulated values of sprung mass T815 vehicle accelerations. In the article, there are presented courses of total vertic

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Kvåle, Knut Andreas, and Ole Øiseth. "Dynamic Response of an End-Supported Pontoon Bridge due to Wave Excitation: Numerical Predictions versus Measurements." Shock and Vibration 2021 (May 31, 2021): 1–18. http://dx.doi.org/10.1155/2021/8842812.

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Herein, numerical predictions of the dynamic response of an existing floating pontoon bridge are compared with the measured dynamic response. Hydrodynamic coefficients that describe the fluid-structure interaction and the wave transfer functions are obtained by applying linear potential theory. The results obtained from the hydrodynamic analysis are combined with a beam model of the bridge in a finite element method (FEM) framework to enable stochastic response prediction through the power spectral density method. The standard deviations of the predicted accelerations are compared with the sta

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ALBEVERIO, SERGIO, and WOLFGANG ALT. "STOCHASTIC DYNAMICS OF VISCOELASTIC SKEINS: CONDENSATION WAVES AND CONTINUUM LIMITS." Mathematical Models and Methods in Applied Sciences 18, supp01 (2008): 1149–91. http://dx.doi.org/10.1142/s0218202508002991.

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Skeins (one-dimensional queues) of migrating birds show typical fluctuations in swarm length and frequent events of "condensation waves" starting at the leading bird and traveling backward within the moving skein, similar to queuing traffic waves in car files but more smooth. These dynamical phenomena can be fairly reproduced by stochastic ordinary differential equations for a "multi-particle" system including the individual tendency of birds to attain a preferred speed as well as mutual interaction "forces" between neighbors, induced by distance-dependent attraction or repulsion as well as ad

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Wang, Yen Po, Yi Ting Lin, and Gang Huang. "Damage Localization of Output-Only Frame Systems Using Stochastic Subspace Identification." Advanced Materials Research 446-449 (January 2012): 1352–59. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.1352.

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Assurance of integrity of structures is the main task of structural health monitoring. The condition (health) of a structure may be revealed from its dynamic characteristics in response to natural or man-made loads. As the measurement of the natural or operating forces on actual real-life structures is generally formidable, dynamic characteristics of the structures have to be extracted from the available output signals only. The stochastic subspace identification (SSI) technique is adopted in this study to identify the equivalent system parameters of the discrete-time state equation using cova

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Astakhov, Sergei, and Vasily Biryukov. "Stochastic Mechanism of Shock Disturbances of Rocket Sleigh Supports during High-Speed Track Testing of Aviation Equipment." E3S Web of Conferences 446 (2023): 01005. http://dx.doi.org/10.1051/e3sconf/202344601005.

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Tests of ballistic aircraft on rail tracks in conditions close to real ones are an economically viable alternative to flight tests. Rocket rail tracks exist in the USA, Canada, France, China and a number of other countries. The article con-siders potentially self-oscillating mechanical systems that have a threshold mechanism for the transition from a noise vibrational stable state to a self-oscillatory one, depending on the mode parameters. An algorithm for estimating the damping coefficient of the harmonic components of a particular mode of a complex process is proposed. As an indicator of en

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Liang, Jinfan, Xun Huang, Qiwang Xu, Yu Liu, Jingfan Zhang, and Jie Huang. "A Novel UAV-Assisted Multi-Mobility Channel Model for Urban Transportation Emergency Communications." Electronics 12, no. 14 (2023): 3015. http://dx.doi.org/10.3390/electronics12143015.

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Abstract (sommario):

With the increasing requirements for unmanned aerial vehicle (UAV) communication in various application scenarios, the UAV-assisted emergency communication in urban transportation scenario has received great attention. In this paper, a novel UAV-assisted UAV-to-vehicle (U2V) geometry-based stochastic model (GBSM) for the urban traffic communication scenario is proposed. The three-dimensional (3D) multi-mobilities of the transmitter (Tx), receiver (Rx), and clusters are considered by introducing the time-variant acceleration and velocity correspondingly. The velocity variation of the clusters i

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Liang, Wei, Jin Huang, Jie Zhang, Xiaodong Tang, and Youran Zhang. "Reconstruction of vibration-deformation-induced pointing error via optimized acceleration measurement points for large reflector antennas." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 10 (2018): 3417–28. http://dx.doi.org/10.1177/0954406218818609.

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Abstract (sommario):

As large reflector antennas have a low natural frequency and primarily operate in open air without a radome, factors such as the stochastic wind disturbance and the moving platform obviously increase the vibration-deformation pointing error. Moreover, in the actual working operation of large reflector antennas, the traditional measurement method can only sense the pointing error at the hinge via encoders and cannot sense the vibration-deformation-induced pointing error of the main reflector. This paper presents a reconstruction method of the vibration-deformation-induced pointing error for the

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48

Kuznetsov, Borys I., Ihor V. Bovdui, Olena V. Voloshko, Tetyana B. Nikitina, and Borys B. Kobylianskyi. "Multicriteria Optimization of Stochastic Robust Control of the Tracking System." Journal of Mechanical Engineering 27, no. 3 (2024): 53–64. http://dx.doi.org/10.15407/pmach2024.03.053.

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Abstract (sommario):

A multicriteria optimization of stochastic robust control with two degrees of freedom of a tracking system with anisotropic regulators has been developed to increase accuracy and reduce sensitivity to uncertain object parameters. Such objects are located on a moving base, on which sensors for angles, angular velocities and angular accelerations are installed. Improvements in the accuracy of control with two degrees of freedom include closed-loop feedback control and open-loop feedback control through the use of reference and perturbation effects. The multicriteria optimization of the stochasti

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49

Marzbanrad, Javad, Goodarz Ahmadi, Yousef Hojjat, and Hassan Zohoor. "Optimal Active Control of Vehicle Suspension System Including Time Delay and Preview for Rough Roads." Journal of Vibration and Control 8, no. 7 (2002): 967–91. http://dx.doi.org/10.1177/107754602029586.

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Abstract (sommario):

An optimal preview control of a vehicle suspension system traveling on a rough road is studied. A three-dimensional seven degree-of-freedom car-riding model and several descriptions of the road surface roughness heights, including haversine (hole/bump) and stochastic filtered white noise models, are used in the analysis. It is assumed that contact-less sensors affixed to the vehicle front bumper measure the road surface height at some distances in the front of the car. The suspension systems are optimized with respect to ride comfort and road holding preferences including accelerations of the

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50

Lebedev, Anatoliy, Mykhailo Shuliak, and Andriy Stelmakh. "ANALYSIS OF METHODS AND DEVICES FOR EVALUATION OF THE TRACTION PROPERTIES TRACTOR." Bulletin of the National Technical University «KhPI». Series: Automobile and Tractor Construction, no. 2 (March 19, 2023): 108–17. http://dx.doi.org/10.20998/2078-6840.2022.2.12.

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Abstract (sommario):

The article presents analysis of the methods and means of evaluating of the traction properties tractor. In the previous researches, it was propose to evaluate of the traction properties tractor on their supporting-coupling properties without taking into account the stochastic modes of exploitation and modes of operation. Experimental methods of definitions the traction of tractor require conducting a large number of experiments. Therefore, it is necessary to carry out an analysis of the methods and the means of improving the results of the definitions of the traction of tractor and justify wa

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