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Journal articles on the topic 'Deflection basin parameter'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Park, Hee Mun, Y. Richard Kim, and Seong Wan Park. "Assessment of Pavement Layer Condition with Use of Multiload-Level Falling Weight Deflectometer Deflections." Transportation Research Record: Journal of the Transportation Research Board 1905, no. 1 (2005): 107–16. http://dx.doi.org/10.1177/0361198105190500112.

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A condition assessment procedure for pavement layers that uses multiload-level falling weight deflectometer (FWD) deflections is presented. A dynamic finite element program that incorporates a stress-dependent soil model was used to generate the synthetic deflection database. On the basis of the data in this database, the relationships between surface deflections and critical pavement responses, such as the stresses and strains in each layer, have been established. The FWD deflection data, distress survey results, temperature, and laboratory testing results used to develop this procedure were

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2

Simonin, Jean-Michel, Jean-Michel Piau, Vinciane Le-Boursicault, and Murilo Freitas. "Orthogonal Set of Indicators for the Assessment of Flexible Pavement Stiffness from Deflection Monitoring: Theoretical Formalism and Numerical Study." Remote Sensing 14, no. 3 (2022): 500. http://dx.doi.org/10.3390/rs14030500.

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The monitoring of pavements along roads is generally based on the use of indicators directly derived from measurements. More specifically, the bearing capacity of pavements is often simply deduced from either the maximum deflection value measured or the difference between two measured values along the deflection basin. This paper proposes a methodology to define a set of orthogonal indicators adapted to the structure being evaluated. This methodology is presented for deflection measurements recorded on a flexible pavement simulated by the Burmister model and consists of searching the weighting

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3

Qamhia, Issam I. A., Erol Tutumluer, Hasan Ozer, and Pranshoo Solanki. "Mechanistic Analyses and Modeling of Pavement Sections Utilizing Sustainable Aggregate Quarry By-Product Applications." Transportation Research Record: Journal of the Transportation Research Board 2674, no. 10 (2020): 614–27. http://dx.doi.org/10.1177/0361198120935115.

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This paper presents a modeling study based on finite element (FE) analysis to mechanistically evaluate flexible pavements constructed with quarry by-products (QB). Twelve pavement test sections, a control section, and 11 others incorporating QB as unbound subgrade replacement and chemically stabilized base/subbase applications were evaluated for field performance using accelerated pavement testing (APT). First, falling weight deflectometer (FWD) deflection basin parameters were calculated and compared with critical pavement responses to evaluate the structural adequacies of the QB pavement sec

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4

Fan, Jianwei, Tao Ma, Junqing Zhu, Yajing Zhu, and Yiming Zhang. "Characteristics of High-speed deflection basin and structural parameter Back-calculation of asphalt pavement with different structural states." Construction and Building Materials 341 (July 2022): 127869. http://dx.doi.org/10.1016/j.conbuildmat.2022.127869.

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5

Pierini, Stefano, Pierpaolo Falco, Giovanni Zambardino, Thomas A. McClimans, and Ingrid Ellingsen. "A Laboratory Study of Nonlinear Western Boundary Currents, with Application to the Gulf Stream Separation due to Inertial Overshooting*." Journal of Physical Oceanography 41, no. 11 (2011): 2063–79. http://dx.doi.org/10.1175/2011jpo4514.1.

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Abstract Various dynamical aspects of nonlinear western boundary currents (WBCs) have been investigated experimentally through physical modeling in a 5-m-diameter rotating basin. The motion of a piston with a velocity up that can be as low as up = 0.5 mm s−1 induces a horizontally unsheared current of homogeneous water that, flowing over a topographic beta slope, experiences westward intensification. First, the character of WBCs for various degrees of nonlinearity is investigated. By varying up, flows ranging from the highly nonlinear inertial Charney regime down to a weakly nonlinear regime c

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Amador-Jiménez, Luis Esteban, and Donath Mrawira. "Capturing variability in pavement performance models from sufficient time-series predictors: a case study of the New Brunswick road network." Canadian Journal of Civil Engineering 38, no. 2 (2011): 210–20. http://dx.doi.org/10.1139/l10-127.

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This paper proposes the use of multi-level Bayesian modeling for calibrating mechanistic model parameters from historical data while capturing reliability by estimating a desired confidence interval of the predictions. The model is capable of estimating the parameters from the observed data and expert criteria even in cases of missing data points. This approach allows rapid generation of several deterioration models without the need to partition the data into pavement families. It estimates posterior distributions for model coefficients and predicts values of the response for unobserved levels

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Ma, Lukuan, Min Li, Jinsong Pang, and Chongwei Huang. "Evaluation of Transverse Cracks for Semi-Rigid Asphalt Pavements using Deflection Basin Parameters." Transportation Research Record: Journal of the Transportation Research Board 2673, no. 2 (2019): 358–67. http://dx.doi.org/10.1177/0361198119826075.

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To evaluate transverse cracks on a semi-rigid asphalt pavement by falling weight deflectometer (FWD), a three-dimensional (3D) dynamic finite-element (FE) model to calculate the deflections of transverse-cracked semi-rigid asphalt pavements under FWD loading was developed and validated by in-situ FWD tests. Then, the effect of crack types and crack width on the deflection basin was investigated for semi-rigid asphalt pavements under different interlayer contact conditions. The relationship between transverse cracks and deflection basin parameters (DBPs) was also analyzed. Finally, the slope ra

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8

Lee, Yung-Chien, Y. Richard Kim, and S. Ranji Ranjithan. "Dynamic Analysis-Based Approach To Determine Flexible Pavement Layer Moduli Using Deflection Basin Parameters." Transportation Research Record: Journal of the Transportation Research Board 1639, no. 1 (1998): 36–42. http://dx.doi.org/10.3141/1639-04.

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Most of the deflection analysis programs used today to analyze falling weight deflectometer (FWD) data are based on static analysis, which often underestimates the subgrade strength. Unfortunately, dynamic analysis usually involves complex calculations and requires significant computation time, thus making it impractical for routine applications. A methodology based on deflection basin parameters and artificial neural networks (ANN) for processing dynamic FWD measurements to estimate layer strengths is presented in this paper. Two-dimensional, dynamic finite element analysis using the ABAQUS p

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9

Yin, Fu Cheng, Guang Chun Zhou, and Hua Guo. "Parametric Analysis of Flexible Pavement Layers’ Accumulating Deflections." Applied Mechanics and Materials 253-255 (December 2012): 626–31. http://dx.doi.org/10.4028/www.scientific.net/amm.253-255.626.

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This paper conducted a parametric analysis of the flexible pavement layers’ accumulating deflections. The accumulating process of the full-scale medium-strength subgrade (MFC) pavement layer deflections had been simulated by the previous radial basic function (RBF) model. Based on the RBF simulation results, several parameters were proposed to investigate the accumulating features of the pavement layer thickness response, the relationship between layer deflection capacity and average layer thickness, the relationship between the average thickness values of two layers and the relationship betwe

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10

Quattrocchi, G., S. Pierini, and H. A. Dijkstra. "Intrinsic low-frequency variability of the Gulf Stream." Nonlinear Processes in Geophysics 19, no. 2 (2012): 155–64. http://dx.doi.org/10.5194/npg-19-155-2012.

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Abstract. In this paper a process study aimed at analyzing the low-frequency variability of intrinsically oceanic origin of the Gulf Stream (GS) and GS extension (GSE) is presented. An eddy-permitting reduced-gravity nonlinear shallow water model is implemented in an idealized North Atlantic Ocean, with schematic boundaries including the essential geometric features of the coastline and a realistic zonal basin width at all latitudes. The forcing is provided by a time-independent climatological surface wind stress obtained from 41 years of monthly ECMWF fields. The model response yields strong

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11

Park, Hee Mun, and Y. Richard Kim. "Prediction of Remaining Life of Asphalt Pavement with Falling-Weight Deflectometer Multiload-Level Deflections." Transportation Research Record: Journal of the Transportation Research Board 1860, no. 1 (2003): 48–56. http://dx.doi.org/10.3141/1860-06.

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The development of prediction methods for the remaining life of flexible pavements using falling-weight deflectometer (FWD) multiload-level deflections is presented. Pavement response models and pavement performance models were used in developing this procedure. The pavement response models were designed to predict critical pavement responses from surface deflections and deflection basin parameters. The pavement performance models were used to develop the relationships between critical pavement responses obtained from pavement response models and actual pavement performance. Pavement distress

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12

Qiu, Xin, Qing Yang, and Yong Ju Hu. "Influence of Layer Interface Condition on Modulus Backcalculation Results of Semi-Rigid Asphalt Pavement." Advanced Materials Research 168-170 (December 2010): 1277–80. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1277.

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To make appropriate rehabilitation decisions, determining structural layer moduli of the existing semi-rigid asphalt pavements is a crucial task for highway engineers. The objective of this study was to analyze the errors in layer moduli backcalculation due to modeling of layer interface condition. Firstly, according to the full bonding hypothesis, a dynamic finite element analysis model was established to generate a synthetic surface deflection database of the semi-rigid asphalt pavements. Then, the regression functions between deflections basin parameters and layer moduli were created and us

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13

Gopalakrishnan, Kasthurirangan. "PREDICTING CAPACITIES OF RUNWAYS SERVING NEW LARGE AIRCRAFT." TRANSPORT 23, no. 1 (2008): 44–50. http://dx.doi.org/10.3846/1648-4142.2008.23.44-50.

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This paper presents a simplified approach for predicting the allowable load repetitions of New Large Aircraft (NLA) loading for airfield runways based on Non‐Destructive Test (NDT) data. Full‐scale traffic test results from the Federal Aviation Administration's National Airport Pavement Test Facility (NAPTF) were used to develop the NDT‐based evaluation methodology. Four flexible test pavement sections with variable (unbound layer) thicknesses were trafficked using six‐wheel and four‐wheel NLA test gears until the test pavements were deemed failed. Non‐destructive tests using a Heavy Weight De

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14

Makhinko, A. V., and N. О. Makhinko. "THIN-WALLED BARRELL SHELL DEFLECTIVE MODE ANALYSIS." ACADEMIC JOURNAL Series: Industrial Machine Building, Civil Engineering 1, no. 50 (2018): 69–78. http://dx.doi.org/10.26906/znp.2018.50.1061.

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The paper deals with the deflective mode of steel rotary shell with different form of outer surface that are loaded with axially symmetric load. The results show solution of shell voltage and strain equation under the load that is described by exponential law and based on efforts from temperature differentials. Besides, the paper represents design formulas for deflection analysis, running bending moments and running transverse forces in shells with different abutment to the basis. It was shown the basic function of deflection and maximum value of relevant parameters of the reaction. The analys

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15

Zhang, Jin, Qiuzhen Lv, Wei Shi, Guangsheng Li, and Jiafeng Zhang. "Refinement of a Deflection Basin Area Index Method for Rigid Pavement." Shock and Vibration 2021 (June 21, 2021): 1–15. http://dx.doi.org/10.1155/2021/8684596.

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The accuracy of the prediction and reliability of the deflection basin area index method for rigid pavement heavily depend on the sensor layout scheme and the calculation theory. A total of 154 groups of deflection data were generated by the finite element software in different conditions, and the simulated results were in good agreement with the analytical solutions of thin plates on elastic foundation. The accuracy of several types of deflection basin area index methods was assessed with the database of pavement deflection results. It is found that, apart from densifying the distal sensor la

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16

Kumar, Rahul, Achchhe Lal, and B. M. Sutaria. "Non-linear deflection and stress analysis of laminated composite sandwich plate with elliptical cutout under different transverse loadings in hygro-thermal environment." Curved and Layered Structures 7, no. 1 (2020): 80–100. http://dx.doi.org/10.1515/cls-2020-0008.

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AbstractIn this paper, non-linear transverse deflection, stress and stress concentration factors (SCF) of isotropic and laminated composite sandwich plate (LCSP) with and without elliptical cutouts subjected to various trans-verse loadings in hygrothermal environment are studied. The basic formulation is based on secant function-based shear deformation theory (SFSDT) with von-Karman nonlinearity. The governing equation of non-linear deflection is derived using C0 finite element method (FEM) through minimum potential energy approach. Normalized trans-verse maximum deflections (NTMD) along with

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17

Goshu, Belay Sitotaw. "Examining quantum gravity's effects on gravitational rainbows." Brazilian Journal of Science 3, no. 8 (2024): 85–98. http://dx.doi.org/10.14295/bjs.v3i8.609.

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This paper delves into the fundamental implications of quantum gravity on gravitational rainbows, an intriguing phenomenon resulting from the interaction between quantum mechanics and gravity. We explore the theoretical underpinnings of quantum gravity and how they affect light bending around enormous objects, providing insight into the phenomenon known as gravitational rainbows. We investigate the complex interplay between quantum gravity and gravitational events by thoroughly analyzing theoretical models, experimental findings, and computer simulations, providing insights into the essence of

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18

Sabirov, Rashid A., and Elena N. Fisenko. "Modeling of suspended weightlessness on the cables of the beam system, by changing the tension forces." Siberian Aerospace Journal 24, no. 3 (2023): 482–500. http://dx.doi.org/10.31772/2712-8970-2023-24-3-482-500.

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The problem of weightlessness simulation of beam systems suspended on inextensible cables is considered. Imitation of weightlessness means zeroing or reducing any selected force factor (for example, the reaction of the support or the moment in the support or joint), and the kinematic factor (deflection or angle of rotation). It is required to select the forces in the cables such that the sum of the squares of the deflections at the points of the elastic line of the beam is minimal. The problem is formulated as a nonlinear programming problem; the search for the minimum of the objective functio

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19

Talvik, O., and A. Aavik. "Use of FWD Deflection Basin Parameters (SCI, BDI, BCI) for Pavement Condition Assessment." Baltic Journal of Road and Bridge Engineering 4, no. 4 (2009): 196–202. http://dx.doi.org/10.3846/1822-427x.2009.4.196-202.

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20

Qiu, Xin, Xiao Hua Luo, and Qing Yang. "Influence of Cracking Damage on Deflection Basin Test Data of FWD." Key Engineering Materials 620 (August 2014): 55–60. http://dx.doi.org/10.4028/www.scientific.net/kem.620.55.

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With the popularization of falling weight deflectometer (FWD) to calculate the stiffness related parameters of the pavement structures, non-destructive evaluation of physical properties and performance of pavements has taken a new direction. FWD backcalculation is mathematically an inverse problem that could be solved either by deterministic or by probabilistic approach. A review of the currently used backcalculation procedures indicates that the calculation is generally based on a homogeneous, continuous, and linear elastic multi-layer system. Identifying effective data of dynamic deflection

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21

Guo, Cui Xia, Kang Liu, and Wen Ling Xie. "Optimal Design of Basic Parameter of Disconnected Steering Trapezoid." Advanced Materials Research 424-425 (January 2012): 334–37. http://dx.doi.org/10.4028/www.scientific.net/amr.424-425.334.

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In the design of disconnected steering trapezoid, the Fmincon function of MATLAB optimization toolbox is used to optimize its basic parameters. First, establish the optimal mathematical model. Second, obtain wheel angle curve of inside and outside steering by least-squares fitting. Finally, compare the curve with the ideal Ackerman geometric curve to get the optimization parameters of disconnected steering trapezoid. The example of optimized design validated that the actual curve of deflection angle of the both sides of steering wheel was almost close to perfect Ackerman geometry curve, it ens

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22

Ahmed, Namir G. "INFLUENCE OF VARIABILITY IN FLEXIBLE PAVEMENT PARAMETERS ON BACKCALCULATED MODULI." Journal of Engineering 12, no. 02 (2006): 445–57. http://dx.doi.org/10.31026/j.eng.2006.02.20.

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Many researchers recommended Falling Weight Deflectometer (FWD) to be use for the purpose ofstiffness profile determination of existing pavement. Several sources of uncertainties contribute tothe inaccuracies in moduli obtained in this manner. these include: 1) the measured parameters(deflection basin and FWD load), 2) the back calculation model, and 3) the pavement parameters, such as Poisson's ratio and thickness of each pavement layer . In the present study the influence of the variation in the thickness and other pavement parameters on the backcalcuted moduli are investigated .Theoretical

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23

Xiao, Manzhe, Rong Luo, and Xiaohe Yu. "Assessment of asphalt pavement overall performance condition using functional indexes and FWD deflection basin parameters." Construction and Building Materials 341 (July 2022): 127872. http://dx.doi.org/10.1016/j.conbuildmat.2022.127872.

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24

Liu, Xu, Xudong Wang, Yang Wu, and Xingye Zhou. "Modulus Back-Calculation of Four-Layer System Based on the Characteristic Parameters of Deflection Basin." Journal of Testing and Evaluation 50, no. 4 (2022): 20210717. http://dx.doi.org/10.1520/jte20210717.

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25

Chen, Xueqin, Qiao Dong, and Shi Dong. "Evaluation and Prediction of Pavement Deflection Parameters Based on Machine Learning Methods." Buildings 12, no. 11 (2022): 1928. http://dx.doi.org/10.3390/buildings12111928.

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The deflection measurements made using Falling Weight Deflectometers (FWDs) are widely used in the back-calculation of pavement layer moduli. Pavement structural characteristics, changes in temperature, and other related factors exert a significant effect on the deflection measurements. Therefore, three machine learning methods—Classification and Regression Tree (CART), Random Forest (RF), and Gradient Boosting Decision Tree (GBDT)—were used to evaluate the importance of influencing factors including FWD test conditions, pavement structural parameters, climatic factors, traffic level, rehabili

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Seitl, Stanislav, Zbyněk Keršner, Vlastimil Bílek, and Zdeněk Knésl. "Fatigue Parameters of Cement-Based Composites with Various Types of Fibres." Key Engineering Materials 417-418 (October 2009): 129–32. http://dx.doi.org/10.4028/www.scientific.net/kem.417-418.129.

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The paper introduces the basic fracture mechanics parameters of advanced building material – cement-based composites with various types of fibres, prepared as high performance concrete/mortar developed by ZPSV, a.s. company for production of thin-walled panels/elements. To this end three-point bend specimens with starting notch were prepared and tested under static (load–deflection diagram, effective fracture toughness) and cyclic loading (fatigue parameter – Wöhler curve). The experimentally obtained results of cement-based composites are compared and the suitability of these types composites

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27

Tereshchenko, Tetyana. "Prediction of temperatures within the depth of asphalt concrete layers and the modeling of temperature-dependent parameters for flexible road pavements design purposes." Dorogi i mosti 2024, no. 30 (2024): 214–27. http://dx.doi.org/10.36100/dorogimosti2024.30.214.

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Introduction. The introduction to the paper highlights the aspects of the analysis of results of flexible road pavement load test which shall be related to the temperature-dependent characteristics of asphalt concrete. Problem statement. The issues of the paper concern the questions of prediction of temperature within the asphalt concrete layer by the BELLS mathematical model and also the adjustment of the flexible pavement’s assessment and design parameters to the reference temperatures. Purpose. The goal of the paper is to analyze the main provisions of the BELLS model and also provisions fo

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Lee, Ying-Haur, Hsin-Ta Wu, and Shao-Tang Yen. "Parameter studies and verifications on three-dimensional finite element analysis of rigid pavements." Canadian Journal of Civil Engineering 31, no. 5 (2004): 782–96. http://dx.doi.org/10.1139/l04-047.

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The main objective of this study was to conduct in-depth parameter studies and verifications on three-dimensional (3-D) finite element (FEM) analysis of rigid pavements. A systematic analytical approach was utilized and implemented in a Visual Basic software package to study the effects of mesh fineness and element selection. The deflection and stress convergence characteristics of various 3-D shell and solid elements were investigated. Several guidelines in mesh fineness and element selection were developed and recommended. Using the principles of dimensional analysis, an additional dimension

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29

Pigozzi, Franco, Silvia Portas, Francesca Maltinti, and Mauro Coni. "Analysis of Runway Deflectometer Campaign for Implementation on Airport Pavement Management System." International Journal on Pavement Engineering & Asphalt Technology 15, no. 2 (2014): 11–26. http://dx.doi.org/10.2478/ijpeat-2013-0009.

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Abstract The load-carrying capacity, is one of the indicators used to assess airfield pavement conditions. It could be estimated by evaluating the response of stationary dynamic loads, using a deflectometric device that simulates the stress inducted by an aircraft moving at moderate speed. This device is widely used because tests are nondestructive and rapid to execute and can be conducted for cyclic investigations, providing valuable support to maintenance and rehabilitation (M&R) decision makers through pavement management system (PMS). Pavement response is evaluated as a function of the

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Lin, Yuh-Lang, Shu-Yun Chen, Christopher M. Hill, and Ching-Yuang Huang. "Control Parameters for the Influence of a Mesoscale Mountain Range on Cyclone Track Continuity and Deflection." Journal of the Atmospheric Sciences 62, no. 6 (2005): 1849–66. http://dx.doi.org/10.1175/jas3439.1.

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Abstract In this study prospective control parameters are identified for diagnosing the continuity and deflection of cyclone tracks across a mesoscale mountain range. Based on idealized simulations of a westward-moving cyclone, it was found that the cyclone track becomes a discontinuous (continuous) track and the cyclone experiences more (less) deflection with a combination of small (large) values of Vmax/Nh, U/Nh, R/Ly, U/fLx, and Vmax/fR, and large (small) value of h/Lx. The symbols are defined as follows: Vmax the maximum tangential wind, N the Brunt–Väisälä frequency, h the mountain height

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31

Mitridis, Dimitrios, Chris Bliamis, Pericles Panagiotou, and Kyros Yakinthos. "A novel technique for hypersonic vehicle control." MATEC Web of Conferences 304 (2019): 02008. http://dx.doi.org/10.1051/matecconf/201930402008.

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A novel control technique is investigated for hypersonic aerial vehicles. The technique is based on the use of active shock bumps (SBs) as a form of control device. The SBs deflect to create shockwaves on–demand, at specific locations around the aerial vehicle. As a result, a force is applied on the aerial vehicle, which in turn is used to provide the necessary moment for pitch and roll manoeuvres. In this work, a preliminary aerodynamic analysis of the SB device technique is made by means of CFD. For this purpose, and taking the large corresponding Reynolds numbers of the flow into considerat

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Meshkani, Amitis, Imad N. Abdallah, and Soheil Nazarian. "Feasibility of Backcalculation of Nonlinear Flexible Pavement Layer Parameters from Nondestructive Testing." Transportation Research Record: Journal of the Transportation Research Board 1860, no. 1 (2003): 16–25. http://dx.doi.org/10.3141/1860-02.

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Nondestructive testing (NDT) methods are typically used to measure the variations in the modulus of different pavement layers. The falling-weight deflectometer (FWD) and the seismic pavement analyzer (SPA) are two of the NDT devices used for this purpose by the Texas Department of Transportation. Since the loads applied by the FWD to the pavement are similar to those exerted by traffic, the FWD moduli are used in pavement design and analysis without adjusting them for the nonlinear behavior of the materials. Seismic moduli are similar to linear elastic moduli since they correspond to small ext

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Park, Bongsuk, Seonghwan Cho, Reyhaneh Rahbar-Rastegar, Tommy E. Nantung, and John E. Haddock. "Prediction of critical responses in full-depth asphalt pavements using the falling weight deflectometer deflection basin parameters." Construction and Building Materials 318 (February 2022): 126019. http://dx.doi.org/10.1016/j.conbuildmat.2021.126019.

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Jin, Lu, Yin-Fei Yang, Ren-Zheng Li, Ya-Wen Cui, Muhammad Jamil, and Liang Li. "Study on Springback Straightening after Bending of the U-Section of TC4 Material under High-Temperature Conditions." Materials 13, no. 8 (2020): 1895. http://dx.doi.org/10.3390/ma13081895.

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The thin-walled structures of titanium alloys have peculiar characteristics involving thin curved surfaces, complicated structures, and a poor rigidity. Therefore, bending or twisting distortion frequently occurs in forging, extrusion, drawing, transportation, cooling, and manufacturing. Straightening theory focuses on the straightening curvature or bending moment at room temperature, and a unified analytical model of the straightening curvature, the straightening bending moment, and the straightening stroke, as well as a study on springback straightening under high-temperature conditions, hav

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Zhuang, Chuan Yi, and Ya Li Ye. "Modulus Back-Calculation Based on FWD Dynamic Deflection Basin for Semi-Rigid Base Asphalt Pavement." Applied Mechanics and Materials 587-589 (July 2014): 1062–66. http://dx.doi.org/10.4028/www.scientific.net/amm.587-589.1062.

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To study semi-rigid base asphalt pavement response characteristics, two structural APT test roads of cement stabilized aggregate and lime fly-ash stabilized aggregate were constructed, and accelerated loading test was developed. After certain number of wheel loads (70,000 times) pavement deflection basin parameters were detected by using the falling weight deflectometer, then modulus of each pavement layer was back-calculated, dynamic response was analyzed. Studies have shown that the modulus of semi-rigid base decay faster, and with decreasing thickness of the semi-rigid base, the greater the

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Liu, Zhongyuan, and Binqian Zhang. "Investigation on a Flow Coupling Rudder for Directional Control of a Low-Aspect Tailless Configuration with Diamond-Shaped Wing." Aerospace 9, no. 2 (2022): 79. http://dx.doi.org/10.3390/aerospace9020079.

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To solve the issues of directional control and aerodynamic moment coupling for a low-aspect tailless configuration with a diamond-shaped wing, we herein propose the concept of a flow coupling rudder (FCR). The FCR was composed of two basic control surfaces: a spoiler slot deflector (SSD) on the upper surface of the wing and the corresponding elevon. With the constraints of the fixed area and spanwise position of the SSD, the effects of the leading-edge sweep angle, chord position of the SSD, and collocating deflection angles of the SSD and elevon on the control characteristics of the configura

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Gerlach, Hendrik, Hartwig Müller, Marcus Klingelhöfer, et al. "Deflection Sheaves for Elevator Application in Lightweight Design." Key Engineering Materials 809 (June 2019): 347–52. http://dx.doi.org/10.4028/www.scientific.net/kem.809.347.

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Current elevators are mostly designed as rope-dependent elevators. Main components in the roping system are the deflection sheaves which are conventional manufactured of grey cast iron. Due to the high weight of cast iron sheaves there is a high potential for reducing mass, especially when regarding aspects of effort, safety and ergonomics while assembly and maintenance in the elevator shaft. Within the framework of a R&D co-operation the Chemnitz University of Technology and the AMB Oberlungwitz GmbH developed a fibre-reinforced plastic sheave that comply with the requirements of lightwei

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Qu, Siju, Yuanyang Zhao, Jingli Zhang, Baosheng Yang, and Xinyu Wang. "Optimization Design of Rocket Deflector Channel Surface Based on Kriging Surrogate Model." Journal of Physics: Conference Series 2755, no. 1 (2024): 012027. http://dx.doi.org/10.1088/1742-6596/2755/1/012027.

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Abstract This study aims to optimize the gas flow environment of a rocket’s deflector channel. Numerical calculations and analysis were conducted on the influencing factors of a certain type of single-sided deflector channel, with the injection coefficient used as the evaluation index for the flow clearance. The study identified the deflector channel’s impact angle, curvature diameter of the bending section, and distance from the top of the deflector surface to the bottom as important structural parameters. There exists a complex nonlinear relationship between these parameters and the gas flow

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Tang, Yongsheng, Jigang Cang, Bohan Zheng, and Wei Tang. "Deflection Monitoring Method for Simply Supported Girder Bridges Using Strain Response under Traffic Loads." Buildings 14, no. 1 (2023): 70. http://dx.doi.org/10.3390/buildings14010070.

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Deflection measurements are usually used as a key index in civil engineering for performing structural assessments of bridge safety. However, owing to technical or cost issues, it may be difficult to implement long-term monitoring of bridge deflection, especially for short- or medium-span bridges. Therefore, this study presents a novel method for measuring the deflection of simply supported girder bridges. In the proposed method, the strain measurement was implemented under traffic loading at only one position, such as middle span, and then the strain distribution along the girder was reconstr

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Beninca, Giovanni Pasquale, and Adriana Goulart Dos Santos. "Fatigue cracking prediction of cobblestone interlayer pavement using non-destructive testing and mechanistic-empirical analyses." TRANSPORTES 32, no. 3 (2024): e3022. http://dx.doi.org/10.58922/transportes.v32i3.3022.

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Several non-destructive testing (NTD) methods have been used to measure surface deflection, which makes to determine the elastic moduli of pavement layers through the back-calculation process and assess the structural capacity of asphalt pavements. In this study was evaluated the back-calculated moduli of the cobblestone interlayer pavements and the load capacity of this type of pavement related to the fatigue cracking criterion based on a mechanistic-empirical analysis. The employed methodology included the performance of on-site trials using non-destructive testing with the Falling Weight De

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Livneh, Moshe. "Determination of residual life in flexible pavements." Canadian Journal of Civil Engineering 23, no. 5 (1996): 1012–24. http://dx.doi.org/10.1139/l96-908.

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In the field of pavement rehabilitation design, one finds a prominent absence of uniformity in the principles of calculation, a lack of clarity as to the testing methods, and a confusion of basic physical concepts. An example of this situation is the residual life of the pavement structure, which constitutes an important measure in the calculation of pavement bearing capacity. The basic question of how to establish such a parameter in practice is discussed in this paper by examining the relationships between the residual life parameter and the pavement surface state, the pavement structural st

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Kistler, S. F., and L. E. Scriven. "The teapot effect: sheet-forming flows with deflection, wetting and hysteresis." Journal of Fluid Mechanics 263 (March 25, 1994): 19–62. http://dx.doi.org/10.1017/s0022112094004027.

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The flow of a two-dimensional viscous film falling from the edge of an inclined plane exhibits a distinctive set of phenomena which, in various combinations, have been referred to as the teapot effect. This paper makes plain that three basic mechanisms are at the root of these phenomena: deflection of the liquid sheet by hydrodynamic forces, contact-angle hysteresis, and multiple steady states that give rise to a purely hydrodynamic hysteresis. The evidence is drawn from Galerkin/finite-element analysis of the Navier-Stokes system, matched to a one-dimensional asymptotic approximation of the s

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Neskoromnykh, Viacheslav, and Anton Golovchenko. "Performance analysis and modernization of a deflection system based on the downhole hammer." Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal, no. 2 (March 30, 2020): 5–16. http://dx.doi.org/10.21440/0536-1028-2020-2-5-16.

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Introduction. The method of rotary-percussion drilling with downhole hammers is widely used in mining and geological exploration and is also one of the most promising due to the high well flow rates combined with the durability and reliability of designs used in method implementation. One of the main constraints for field use is the lack of a commercially available deflection system capable of adjusting the direction of the wells with high mechanical speed without reducing the technological parameters of drilling. Research aim is to analyze the performance and modernize the designs of the defl

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Xi, Ke, Chao Yan, Yu Huang, and Wen Wang. "Coupled CFD/GNC Modeling for the Basic Finner Projectile with Closed Loop." Applied Mechanics and Materials 541-542 (March 2014): 1478–82. http://dx.doi.org/10.4028/www.scientific.net/amm.541-542.1478.

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The virtual flight simulation of the Basic Finner projectile has been investigated through coupling solving unsteady Navier-Stokes equations, rigid-body six degree-of-freedom motion equations, guidance, navigation and control law. The flow solver uses a finite-volume method based on structure grid with dual time stepping, the chimera method is used to simulate relative motions, the fourth-order Runger-Kutta method is used to solve the motion equations. A closed loop feedback control law with PID control is required for the elevator to attain the commanded deflection. The predictions show that

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Al-Mayahi, D. S. B. "A quantitative analysis of transverse river profiles and its applications for morphotectonics: A case studying Shatt Al-Arab River, Southern Iraq." Mesopotamian Journal of Marine Sciences 26, no. 1 (2022): 15–24. http://dx.doi.org/10.58629/mjms.v26i1.187.

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The present study discussed the quantitative analysis of Transverse River Profile (TRP) on Shatt Al-Arab channel, by deriving several TRP parameters that can be easily quantifiable and comparable. These parameters are useful to detect the morphotectonic indicators of Shatt Al-Arab basin. Five cross sectional profiles were considered from the previous bathymetrical surveys of Shatt Al-Arab channel starting from Qurna (upstream) at the confluence of Tigris and Euphrates rivers towards Fao (downstream). The results illustrated the main rate of controlling the tectonic activity along the river cha

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He, Yongqing, Laan Luo, and Shuang Huang. "Magnetic manipulation on the unlabeled nonmagnetic particles." International Journal of Modern Physics B 33, no. 07 (2019): 1950047. http://dx.doi.org/10.1142/s0217979219500474.

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This paper reports two basic microfluidic strategies for the magnetic manipulation of unlabeled nonmagnetic particles/cells. One is the deflection induced by a single magnet, and the other is the confusing effect produced by two magnets of opposite polarity. They can be combined into more completed particle manipulations like continuous flow separation, counting and detection, which are essential steps in biomedical applications. We experimentally studied the dynamics of 10.4 and 20 [Formula: see text]m nonmagnetic polystyrene particles within a flow rate range of 30, 50, 70 and 90 [Formula: s

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Kolchunov, Vl, A. Kozarez, and M. Protchenko. "RESULTS OF EXPERIMENTAL STUDIES FOR REINFORCED CONCRETE STRUCTURES RESISTANCE ON A DEFORMABLE BASE IN BENDING WITH TORSION." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 8, no. 2 (2022): 41–52. http://dx.doi.org/10.34031/2071-7318-2022-8-2-41-52.

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The article obtains the results of experimental studies of reinforced concrete structures under torsion with bending. The basic parameters of the stress-strain state of eight series of structures, including those on the deformable base and composite ones, have been determined. A test stand is developed for realization of the chosen loading schemes and getting of reliable experimental values of crack loading, deflections, angles of turn, crack opening width, distance between cracks and other parameters of the structures. Loading is carried out smoothly, in small steps with endurance at each sta

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Tao, Jie, Xin Wang, and Jiazhen Si. "Design and Implementation of 4WD Intelligent Car System Based on Integrated Navigation." Innovation in Science and Technology 2, no. 3 (2023): 41–46. http://dx.doi.org/10.56397/ist.2023.05.06.

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Focuses on the basic principle of integrated navigation system based on geomagnetic sensor, three-axis gyroscope and three-axis accelerometer. A four-wheel independent driving car platform is designed with STM32F4 MCU as the control core and RZ7899 as the motor drive. The vehicle heading angle is obtained through the quaternion obtained by MPU6050, and combined with the geomagnetic parameters, the serial double PID control algorithm is used for navigation by correcting the deflection angle, the intelligent car can run in a straight line without other navigation systems within a certain range.

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Machelski, Czesław. "The stiffness of bridge structure as performance parameters of communication." Transportation Overview - Przeglad Komunikacyjny 2016, no. 2 (2016): 1–8. http://dx.doi.org/10.35117/a_eng_16_02_01.

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The stiffness of a bridge structure as a utility parameter of transport constructions Bridge structures, according to the project assumptions, must meet the static-strength require-ments included in the service load bearing capacity of a structure. In the case of slender transport structures, an essential condition of usage (deflections) is the stiffness of the struc-ture, which is the subject of the article. In the case of footbridges, their stiffness may be a basic requirement, resulting from the dynamic vulnerability of the structure. The stiffness of an object can be determined on the basi

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Kozlovskii, V. E., E. V. Gorodnova, and S. S. Kolmogorova. "STRUCTURE SETTING ON COMPOSITE-BASED SOILS." Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture 22, no. 1 (2020): 164–70. http://dx.doi.org/10.31675/1607-1859-2020-22-1-164-170.

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The paper studies the interaction between the building construction and composite-based soil with a view to determine its elastic properties affecting the structure deformation and internal forces. The soil model is assumed to be elastic, according to the Winkler coefficient calculated from the Kolosov stress decay function. The Galerkin numerical method used in calculations utilizes basic functions corresponding to the type of fixing the discontinuous and continuous structures. Unknown coefficients in linear combinations of basic functions are obtained via linear algebra methods, solving the

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