Relevant bibliographies by topics / Physical tire model

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Physical tire model'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Physical tire model.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Physical tire model"

1

Pearson, Matthew, Oliver Blanco-Hague, and Ryan Pawlowski. "TameTire: Introduction to the Model." Tire Science and Technology 44, no. 2 (2016): 102–19. http://dx.doi.org/10.2346/tire.16.440203.

Full text
Abstract:
ABSTRACT Tire modeling is an ever-growing area of interest for vehicles as more efficient development processes are desired in terms of time and resources. Vehicle simulations offer an opportunity for development teams to predict tire and vehicle performance before the construction of a physical prototype. Michelin has identified the need for more robust and accurate tire models that can be used for such simulations to give an accurate description of the transient mechanical and thermal behavior of a tire. Rubber's viscous and elastic properties are heavily dependent on their thermal state; when this effect is not modeled, it results in mathematical tire models that insufficiently predict tire performance. TameTire aims to fill this void for a broad range of maneuvers, track characteristics, and operating conditions based on the ability to predict tire forces and moments with physically based parameters. Some physical characteristics contained within a TameTire model include contact patch dimensions, tread, sidewall and belt stiffnesses, and rubber compound properties. Empirical tire models for handling have limited representation of tire physical properties due to the dependence on the measurement protocol and lack of identification of the thermal state of the tire. TameTire's advance modeling techniques include capturing a tire's thermal effects, thereby allowing for a more accurate and thorough analysis of tires behavior while being physically based (e.g., parameters for stiffness, rubber properties) and allowing the model to be grounded in the actual physics of a tire operating.
APA, Harvard, Vancouver, ISO, and other styles
2

Anderson, Jeffery R., and Erin McPillan. "Simulation of the Wear and Handling Performance Trade-off by Using Multi-objective Optimization and TameTire." Tire Science and Technology 44, no. 4 (2016): 280–90. http://dx.doi.org/10.2346/tire.16.440404.

Full text
Abstract:
ABSTRACT Optimization is a key tool used by automakers to efficiently design and manufacture vehicles. During vehicle design, much effort is devoted to efficiently simulate and optimize as many vehicle parameters as possible to save development costs during physical testing. One area of vehicle development that heavily relies on physical testing and subjective driver feedback is the tire design process. Optimizing tire parameters relies either on this subjective feedback from trained drivers, or use of existing tire data or scaling of a reference tire model simulate the desired design change and provide feedback. These data are often difficult to obtain and properly scale to represent the appropriate design changes. Michelin's TameTire model is a force and moment tire model. It includes thermal tire effects and is physically derived, thereby allowing quick access to scaling factors to change a tire's behavior based on pertinent tire design changes such as tread depth and tread stiffness. In this paper, a multi-objective optimization is performed to observe the trade-off between tire wear and handling performance by using the scaling factors available in the TameTire model.
APA, Harvard, Vancouver, ISO, and other styles
3

Sarkisov, Pavel, Günther Prokop, Jan Kubenz, and Sergey Popov. "Physical Understanding of Transient Generation of Tire Lateral Force and Aligning Torque." Tire Science and Technology 47, no. 4 (2019): 308–33. http://dx.doi.org/10.2346/tire.19.180192.

Full text
Abstract:
ABSTRACT Increasing vehicle performance requirements and virtualization of the development process require more understanding of the physical background of tire behavior, especially in transient rolling conditions with combined slip. The focus of this research is the physical description of the transient generation of tire lateral force and aligning torque. Apart from tire force and torque measurements, two further issues were investigated experimentally. Using acceleration measurement on the tire inner liner, it was observed that the contact patch shape of the rolling tire changes nonlinearly with slip angle and becomes asymmetric. Optical measurement outside and inside the tire has clarified that carcass lateral bending features both shear and rotation angle of its cross sections. A physical simulation model was developed that considers the observed effects. The model was qualitatively validated using not only tire force and torque responses but also deformation of the tire carcass. The model-based analysis explained which tire structural parameters are responsible for which criteria of tire performance. Change in the contact patch shape had a low impact on lateral force and aligning torque. Variation of carcass-bending behavior perceptibly influenced aligning torque generation.
APA, Harvard, Vancouver, ISO, and other styles
4

Salaani, Mohamed Kamel. "Analytical Tire Forces and Moments with Physical Parameters2." Tire Science and Technology 36, no. 1 (2008): 3–42. http://dx.doi.org/10.2346/1.2804130.

Full text
Abstract:
Abstract The pneumatic tire behaves as a highly nonlinear system. Its complexity has limited the development of a complete and reasonable theory governing its mechanics. Practical tire models used in vehicle dynamics simulation and tire-related research rely basically on curve-fitted experimental data and empirical adjustments of theoretical models. This paper introduces a validated analytical model based on the physical properties of the tire by formulating the shear contact phenomena with elliptical normal pressure distribution and planar stress-strain laws. Adjustments are introduced to current methods for estimating distributed stiffness, the use of friction, and the forces saturation phenomena. The analytical model is formulated and normalized to accept tire physical parameters that are easily estimated from force and moments measurements. These parameters are universal to all tires: lateral and longitudinal stiffnesses, aligning pneumatic trail, overturning effective moment arm, and frictional properties. The method of using fundamental mechanics for modeling contact patch forces and moments with tire physical parameters constitutes a significant advancement. The tire model is validated with experimental data.
APA, Harvard, Vancouver, ISO, and other styles
5

TOYOSHIMA, Takayuki, Toshiaki MATSUZAWA, Takeshi HOTAKA, and Eisei HIGUCHI. "Research on tread modeling of physical characteristics tire model (Verification of theoretical validity of TM Tire Model)." Transactions of the JSME (in Japanese) 87, no. 898 (2021): 21–00003. http://dx.doi.org/10.1299/transjsme.21-00003.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

TOYOSHIMA, Takayuki, and Toshiaki MATSUZAWA. "Study of physical characteristic tire Model about cornering stiffness (Proposal of new tire Model suitable for specification consideration)." Transactions of the JSME (in Japanese) 85, no. 880 (2019): 19–00284. http://dx.doi.org/10.1299/transjsme.19-00284.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Guan, Hsin, Chun Guang Duan, and Ping Ping Lu. "The Friction Model of Dynamic-Wheel Model Based on LuGre Model." Applied Mechanics and Materials 556-562 (May 2014): 4288–92. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.4288.

Full text
Abstract:
With the development of the simulator and the increase of vehicle model simulation frequency, the ring tire models become the research focus. The ring model considers the physical characteristics of the tire, thus it can more accurately describe the tire force transmission. State Key Laboratory of Automotive Simulation and Control of Jilin University has developed a dynamic wheel model. This model takes the tire crown part as a rigid-ring and describes the elasticity of the tire by using six spring-dampers to connect the rigid-ring with the wheel rim. This paper focuses on the logical judgment of dynamic, static friction between tire and road. Based on the logical analysis, the tire forces at transient process are researched in order to avoid oscillation. Based on the C language to build simulation program, and embed it into complex vehicle model to simulate different conditions, the simulation results show that the vehicle can start smoothly.
APA, Harvard, Vancouver, ISO, and other styles
8

Seipel, Gunther, Frank Baumann, Ralf Hermanutz, and Hermann Winner. "Analysis of the Influence of Vehicle Dynamic Parameters on Tire Marks." Tire Science and Technology 41, no. 3 (2013): 196–213. http://dx.doi.org/10.2346/tire.13.410302.

Full text
Abstract:
ABSTRACT Tire marks play a central role in the reconstruction of traffic accidents, since they can provide valuable information about the vehicle's trajectory, initial speed, or the steering and braking input of the driver. The research project described in this paper focuses on the analysis of tire marks under controlled conditions using a monowheel setup to enable a selective variation of different vehicle dynamic parameters without mutual influence. The long-term goal is to find a model for the development of tire marks to predict the influence of specific vehicle dynamic parameters on the generation of tire marks. This model may be applied in accident reconstruction tools. A literature review has been performed to find evidence for the development of tire marks and to identify relevant parameters for their generation. Currently, no explicit physical or mathematical model showing the influence of tire forces or slip on the generation of tire marks is available. In the literature, it is often assumed that tire marks occur at the limit of traction. A physically motivated formula has been developed to calculate the friction force within the contact patch as a function of the tire forces, the longitudinal slip, and the side slip angle. The main hypothesis deduced from this formula is that the intensity of a tire mark depends on the magnitude of this friction force independent of the varying parameter. To verify this hypothesis, experiments have been conducted with variations in longitudinal slip, side slip angle, and tire type. First results agree with the model, showing a correlation between the intensity of tire marks and friction force, depending on the tribological and optical tire and road properties. This correlation is introduced as tire-marking sensitivity.
APA, Harvard, Vancouver, ISO, and other styles
9

Mancosu, F., R. Sangalli, F. Cheli, G. Ciarlariello, and F. Braghin. "A Mathematical-physical 3D Tire Model for Handling/Comfort Optimization on a Vehicle: Comparison with Experimental Results." Tire Science and Technology 28, no. 4 (2000): 210–32. http://dx.doi.org/10.2346/1.2136001.

Full text
Abstract:
Abstract A new 3D mathematical-physical tire model is presented. This model considers not only the handling behavior of the tire but also its comfort characteristics, i.e., the dynamic properties in the lateral and the vertical planes. This model can be divided into two parts, the structural model and the contact area model. The structural parameters are identified by comparison with frequency responses of a 3D finite element model of the tire, whereas the contact parameters are directly calculated with a finite element model of the tread pattern. The 3D physical model allows predicting both steady state and transient behavior of the tire without the need of any experimental tests on the tire. The steady state analysis allows obtaining the friction circle diagram, i.e., the plot of the lateral force against the longitudinal force for different slip angles and for longitudinal slip, and the Gough plot, i.e., the diagram of the self-aligning torque versus the lateral force. The transient analysis allows obtaining the dynamic behavior of the tire for any maneuver given to the wheel. Among its outputs there are the relaxation length and the dynamic forces and torque transmitted to the suspension of the vehicle. Combining the tire model with the vehicle model it is possible to perform any kind of maneuver such as overtaking, changing of lane and steering pad at growing speed with or without braking, or accelerating. Therefore the 3D tire model can be seen as a powerful tool to optimize the tire characteristics through a sensitivity analysis performed with tire and vehicle models linked to each other without the need of building prototypes. Some preliminary comparisons with experimental data have been carried out.
APA, Harvard, Vancouver, ISO, and other styles
10

Mancosu, F., G. Matrascia, and F. Cheli. "Techniques for Determining the Parameters of a Two-Dimensional Tire Model for the Study of Ride Comfort." Tire Science and Technology 25, no. 3 (1997): 187–213. http://dx.doi.org/10.2346/1.2137540.

Full text
Abstract:
Abstract A rigid ring model of the tire for the study of in-plane dynamics and a new technique for determining the parameters of the model are presented in this paper. This model can be used for studying the comfort of vehicles, problems of driving, and braking problems in the longitudinal direction. Comparison with finite element models shows that the rigid ring model of the tire is capable of describing the in-plane eigenmode shapes in the frequency range of 0–130 Hz. The well-known “brush model,” integrated into the tire model, is introduced to take into account the slide phenomena in the contact patch. The parameters of the model can be correlated with the physical properties of the tire so that designers can take advantage of such a correlation in the development of new tires in terms of time, cost, and performance. The technique used to determine the parameters of the model for some automobile tires include the direct measurements of some physical properties (mass, moment of inertia, stiffness) and a method of identification applied on the results from a dynamic test. The model is able to predict experimental data in terms of natural frequencies and relative dampings. Results from the application of this technique on two tires are reported.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Physical tire model"

1

Sarkisov, Pavel. "Physical understanding of tire transient handling behavior." Cuvillier Verlag, 2018. https://tud.qucosa.de/id/qucosa%3A34414.

Full text
Abstract:
Increasing vehicle performance requirements and virtualization of its development process require more understanding of physical background of tire behavior, especially in transient rolling conditions with combined slip. The focus of this research is physical description of transient generation of tire lateral force and aligning torque. Using acceleration measurement on the tire inner liner it was observed that the contact patch shape of the rolling tire changes nonlinearly with slip angle and becomes asymmetric. Optical measurement outside and inside the tire has clarified that carcass lateral bending features both shear and rotation angle of its cross-sections. A physical simulation model was developed, which considers the observed effects. A special iterative computing algorithm was proposed. The model was qualitatively validated using not only tire force and torque responses, but also deformation of the tire carcass. The model-based analysis explained which tire structural parameters are responsible for which criteria of tire performance. Contact patch shape change had a low impact on lateral force and aligning torque. Variation of carcass bending behavior perceptibly influenced aligning torque generation. As an example, the gained understanding was applied for feasibility analysis of a novel method to estimate the utilized friction potential rate of a rolling tire.:1 Introduction 1.1 Thesis structure 1.2 Motivation 1.3 State of the art 1.4 Mission statement 1.5 Main terms and hypotheses 1.6 Summary of chapter 1 2 Experimental investigation of tire deformation 2.1 Introduction to experimental research 2.2 Test samples 2.3 Experimental equipment 2.4 Contact patch pressure distribution 2.5 Contact patch geometry of the rolling tire 2.6 Tire carcass deformation 2.7 Tread block properties 2.8 Summary of chapter 2 3 Simulation method of tire deformation behavior 3.1 Concept development 3.2 Physical representation of the model 3.3 Model computing method 3.4 Model parameterization routine 3.5 Model validation 3.6 Summary of chapter 3 4 Model-based analysis 4.1 Understanding of the physical background 4.2 An example of application 4.3 Summary of chapter 4 5 Investigation summary and discussion 5.1 Key results 5.2 Discussion, critique and outlook References List of abbreviations List of symbols List of tables List of figures Appendix
APA, Harvard, Vancouver, ISO, and other styles
2

Zhou, Xiaobin. "Mathematical and Physical Simulations of BOF Converters." Doctoral thesis, KTH, Tillämpad processmetallurgi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175462.

Full text
Abstract:
The purpose of this study is to develop mathematical models to explore the mixing and its related phenomena in converter bath. Specifically, first, a mathematical model of a physical model converter, which was scaled down to 1/6th of a 30 t vessel, was developed in this study. A number of parameters were studied and their effects on the mixing time were recorded in a top blown converter. Second, a mathematical model for a combined top-bottom blown was built to investigate the optimization process. Then, a side tuyere was introduced in the combined top-bottom blown converter and its effects on the mixing and wall shear stress were studied. Moreover, based on the above results, the kinetic energy transfer phenomena in a real converter were investigated by applying the mathematical models. A simplified model, in which the calculation region was reduced to save calculation compared to simulations of the whole region of the converter, was used in the mathematical simulation. In addition, this method was also used in the simulation of real converters. This approach makes it possible to simulate the Laval nozzle flow jet and the cavity separately when using different turbulence models. In the top blown converter model, a comparison between the physical model and the mathematical model showed a good relative difference of 2.5% and 6.1% for the cavity depth and radius, respectively. In addition, the predicted mixing time showed a good relative difference of 2.8% in comparison to the experimental data. In an optimization of a combined top-bottom blown converter, a new bottom tuyere scheme with an asymmetrical configuration was found to be one of the best cases with respect to a decreased mixing time in the bath. An industrial investigation showed that the application effects of the new tuyere scheme yield a better stirring condition in the bath compared to the original case. Furthermore, the results indicated that the mixing time for a combined top-bottom-side blown converter was decreased profoundly compared to a conventional combined top-bottom blown converter. It was found that the side wall shear stress is increased by introducing side blowing, especially in the region near the side blowing plume. For a 100 t converter in real, the fundamental aspects of kinetic energy transfer from a top and bottom gas to the bath were explored. The analyses revealed that the energy transfer is less efficient when the top lance height is lowered or the flowrate is increased in the top blowing operations. However, an inverse trend was found. Namely, that the kinetic energy transfer is increased when the bottom flowrate is increased in the current bottom blowing operations. In addition, the slag on top of the bath is found to dissipate 6.6%, 9.4% and 11.2% for the slag masses 5, 9 and 15 t compared to the case without slag on top of the surface of the bath, respectively.<br><p>QC 20151015</p>
APA, Harvard, Vancouver, ISO, and other styles
3

Peterson, Eric W. "Tire-Road Friction Coefficient Estimation Using a Multi-scale, Physics-based Model." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/51148.

Full text
Abstract:
The interaction between a tire and road surface is of critical importance as the motion of a car in both transient and steady-state maneuvers is predicated on the friction forces generated at the tire-road interface. A general method for predicting friction coefficients for an arbitrary asphalt pavement surface would be an invaluable engineering tool for designing many vehicle safety and performance features, tire design, and improving asphalt-aggregate mixtures used for pavement surfaces by manipulating texture. General, physics-based methods for predicting friction are incredibly difficult, if not impossible to realize—However, for the specific case of rubber sliding across a rough surface, the primary physical mechanisms responsible for friction, notably rubber hysteresis, can be modeled. The objective of the subsequent research is to investigate one such physics model, referred to as Persson Theory, and implement the constitutive equations into a MatLab® code to be solved numerically. The model uses high-resolution surface measurements, along with some of the physical properties of rubber as inputs and outputs the kinetic friction coefficient. The Persson model was successfully implemented into MatLab® and high resolution measurements (from optical microscopy and imaging software) were obtained for a variety of surfaces. Friction coefficients were calculated for each surface and compared with measured friction values obtained from British Pendulum testing. The accuracy and feasibility of the Persson model are discussed and results are compared with a simpler, semi-empirical indenter model. A brief discussion of the merits and drawbacks of the Persson model are offered along with recommendations for future research based on the information acquired from the present study.<br>Master of Science
APA, Harvard, Vancouver, ISO, and other styles
4

Rajapakshe, Madhura Priyanga Nishshanke. "Physically Meaningful Harmonization of Tire/Pavement Friction Measurement Devices." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3303.

Full text
Abstract:
Accurate characterization and evaluation of tire/pavement friction is critical in assuring runway and highway safety. Historically, Pavement Friction Measurement Devices (PFMDs) employing different measuring mechanisms have been used to evaluate tire/pavement friction. They yield significantly disparate friction coefficients under the same contact conditions. Currently, an empirically developed data harmonization method based on a reference device (Dynamic Friction Tester (DFT)) is used in an attempt to overcome the disparities between the measurements using various different PFMDs. However, this method, which has been standardized by the American Society for Testing and Materials (ASTM E1960), has been criticized for its inconsistency by researchers and runway/highway operations personnel. The objective of this dissertation research was to develop a systematic and physically intuitive harmonization method for PFMDs that will improve the comparability of their data. As a foundation for such a harmonization, the LuGre tire model that employs physically meaningful parameters to represent the main attributes of tire/pavement friction was evaluated and validated. Measurements of tire/pavement friction by three widely used PFMDs; Locked Wheel Skid Trailer (LWST), Runway Friction Tester (RFT) and DFT, were accurately predicted using nonlinear optimization of LuGre model parameters. The LuGre model was found to be superior compared to the model used in the current ASTM E1960 standardization procedure for predicting PFMD measurements. A sensitivity analysis was performed to identify the relative significance of the LuGre model parameters in characterizing tire/pavement friction, and to study the effects of variation of those parameters on predicted frictional behavior. A set of laboratory tire experiments was designed and performed to validate the physical significance of LuGre tire model parameters and to study how they behave under typical load, inflation pressure, excitation frequency, and amplitude conditions. An empirical method was developed to accommodate the effects of water film thickness on tire/pavement friction in the LuGre model. The results of the sensitivity analysis and the experiments to directly estimate the model parameters were used to identify and quantify appropriate modifications to the measurement mechanisms of PFMDs that can be introduced to improve the comparability of their results. Friction experiments performed after introducing such modifications to the LWST showed an average reduction of 20% in the deviations between the results of LWST and RFT measurements. The research carried out in this dissertation is significant because it: (i) identified the deficiencies in the current method for harmonizing PFMD measurements and the underlying reasons for these deficiencies, (ii) emphasized the importance of a standardization approach that regulates the physical condition of PFMDs, in order to achieve universal comparability of tire/pavement friction measurements, (iii) validated that the LuGre tire model is a tire/pavement friction model capable of facilitating a better standardization approach, and, (iv) initialized the development of a physically meaningful harmonization procedure for PFMDs.
APA, Harvard, Vancouver, ISO, and other styles
5

Faure, Cyril. "Real-time simulation of physical models toward hardware-in-the-loop validation." Thesis, Paris Est, 2011. http://www.theses.fr/2011PEST1020.

Full text
Abstract:
La validation des systèmes Mécatroniques tels que la supervision d'une chaînede traction hybride utilise de plus en plus la simulation Hardware-in-the-Loop. Cela consiste à interconnecter des composants réels du système et des composantssimulés. On parle alors de simulation temps réel car les composants simulés doivent avoir le même comportement temporel que les réels. En d'autres termes, la simulation temps réel d'un modèle nécessite le maillage de l'évolution du temps simulé sur celle du temps réel. Sur les outils existants, l'intégration de modèles physiques représentatifs se heurte à des modèles de calculs et des contraintes temporelles pessimistes. Cette thèse propose des solutions, analytiques ou tirées d'expérimentations au sein d'IFP Energies nouvelles, pour l'implantation adéquate de la simulation temps réel de modèles physiques. Des métriques ont été introduites pourqualifier et quantifier la validité d'une simulation temps réel. Une définition des contraintes temporelles propres à la simulation temps réel a été proposée, accompagnée des règles régissant leur propagation aux calculs sous-jacents. Ces méthodes ont ensuite été déclinées en étude d'ordonnançabilité pour deux systèmes au comportement pseudo périodique : un simulateur de moteur à combustion et un contrôle moteur. Des expérimentations sur la simulation temps réel distribuée d'un moteur, intégrant des modèles phénoménologiques de combustion, ont permis de justifier et de validerles méthodes proposées. Les dégradations dues à la simulation distribuée ont été corrigées par un mécanisme d'extrapolation paramétrable dont le coût d'exécution a été étudié<br>Validation of Mechatronics systems such as hybrid automotive powertrains isincreasingly relying on Harware-in-the-Loop simulation. It consists in interconnecting real components to the real-time simulation of physical models, involving their timely behavior to match their real counterpart. In other words, the evolution of simulated and real time have to be meshed together. Involving representative physical models is currently hindered by both pessimistic models of computation and temporal constraints.This thesis proposes several analytical and experimental answers, carried out at IFP Energies nouvelles, toward the proper implantation of real-time simulation of physical models. Several metrics able to qualify and quantify the success of real-time simulation were proposed, as well as the definition of its dedicated timed constraints, along with the rules for their propagation toward the underlying computations involved.Then, we showed how to take advantage of the pseudo periodic behavior of two systems to reach better schedulability bounds for the real-time simulation of : a combustion engine and an engine control. The methods discussed were then accounted for and validated by several experiments, involving the distributed real-time simulation of an engine including phenomenological combustion models. Also, the perturbations induced by the distributed simulation were addressed by proposing a configurable extrapolation mechanism, taking into account its execution time
APA, Harvard, Vancouver, ISO, and other styles
6

Ravi, Aruna Subramanian. "Plasmonic Resonances for Spectroscopy Applications using 3D Finite-Difference Time-Domain Models." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1483634449517314.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Zou, Xiaoming. "Models to measure mobilities by time-of-flight /." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486462702468012.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Pfeifle, Florian Verfasser], and Rolf [Akademischer Betreuer] [Bader. "Physical model real-time auralisation of musical instruments : analysis and synthesis / Florian Pfeifle. Betreuer: Rolf Bader." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2016. http://d-nb.info/1108769462/34.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Nelson, A. D. "Observation-Model Comparisons of Near-Surface Ocean Variability on Interannual, Multidecadal, and Orbital Time Scales." Thesis, University of Colorado at Boulder, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10283702.

Full text
Abstract:
<p> This thesis explores the concepts and techniques of observation-model comparisons of the natural variability of the near-surface ocean on three different time scales. The emphasis on natural variability includes removing the all-time trend and seasonality of the data. All analyses used model outputs of the Community Climate System Model version 3.5 (CCSM3.5). </p><p> The first work, <u>An Ensemble Observing System Simulation Experiment of Global Ocean Heat Content Variability,</u> introduces the use of ensemble of model time series to study how a set of observations and how they are processed can capture the statistics of the system being observed. The technique is applied to global ocean heat content (OHC) down to 700m as observed and processed by the In-Situ Analysis System 2013. This study found that before the implementation of the global Argo program (1990-2005), the observed variability is too significantly biased by the low spatial resolution of the observations to return any meaningful estimates of global OHC variability with a median correlation score of 60% and a signal to noise ratio (SNR) of 1.9. The Argo era (2005-2013) is found to do a much better job at estimating global OHC variability to a median correlation score to 95% and an SNR of 14.7. However, this is only true for annual running means and longer; sub-annual variability is still unreliably resolved. </p><p> The second work, <u>Probability Angular Momenta of Multidecadal Oscillations of the North Atlantic,</u> explores concepts in non-equilibrium statistical mechanics, specifically probability angular momentum, as new tools in observation-model comparisons. The indices analyzed include an index related to the Atlantic Multidecadal Oscillation (AMO) and indices related to other oscillations thought to influence the observed variability in the AMO; the atmospheric North Atlantic Oscillation (NAO), the subsurface-ocean Atlantic Meridional Overturning Circulation (AMOC), and outflow from the Labrador Sea (LSO). The PAM analysis was found to detect cycles of the same magnitude and sign as traditional analyses for the simulated indices; for example, the -NAO leads +AMOC by 2 years, +AMO leads -NAO by 10-20 years, and PAMV leads +AMOC by 2-20 years, although the PAM results typically had too low of confidence to support any conclusions from the observed data. The PAM technique also returned a novel insight; a staistically-significant oscillation in the simulated LSO and AMO on the order of 400-1000 years. Since the model output has a time span of only 720 years, this indicates that the PAM technique may be able to detect modes of oscillation with periods on the order of or longer than the time span of the data analyzed, something that cannot be done to any statistical significance via traditional correlation and spectral techniques. </p><p> The final work, <u>PhaseMap: Comparison of Late Pleistocene Surface Temperature Proxies to an Accelerated CCSM3 Simulation,</u> compares the simulated ocean surface in a CCSM3 model run forced using the last 300,000 years of climate forcings to 50 paleotemperature proxies from deep ocean cores around the world. The accelerated model, which was accelerated 100x to simulate 300,000 years of climate in 3,000 model years, was found to agree poorly with the core proxies. While the core proxies correlate strongly with greenhouse gas, ice volume, and sea level forcings, the model results primarily follow the local insolation. It is unclear from this analysis whether this disagreement results from the model being too sensitive to insolation forcing, not sensitive enough to other forcings, or from the fact that the model's subsurface ocean doesn't respond quickly enough to the accelerated forcings. </p><p> These three different fields of ocean study are also inter-compared to explore their individual strengths and weaknesses, and where the techniques of one field may be useful in another. The modern subsurface ocean observations are plagued with uncertainties, and applying the observing system properties to a model was shown to help interpret the uncertainties associated with the spatio-temporal variability in the number and frequency of observations as well as the methodology used to create global maps from these observations. Paleoceanographers often have to work with proxy data that are unevenly sampled in time, and techniques commonly used to mitigate this issue (e.g. Lomb-Scargle method of periodogram estimation) can be used in modern studies where observational data is not available for short periods of time. </p><p> These works explore and propose techniques and concepts regarding surface and near-surface ocean variability on different temporal scales. They also highlight the importance of establishing connections across disciplines working on these different temporal scales. Together, these results improve our understanding of the role of the ocean on the climate system we depend on, and how different disciplines in ocean science can work together to improve our understanding even further.</p><p>
APA, Harvard, Vancouver, ISO, and other styles
10

Moss, Graham James. "A time-dependent collisional-radiative model of low pressure gas discharges." Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269399.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Physical tire model"

1

Shabetnik, Basil D. Fractal physics: Introduction to a new physical model. A. Gylys, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Matolcsi, Tamás. Models in mechanics: A concept of mathematical physics. Akadémiai Kiadó, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Clarke, C. J. S. The analysis of space-time singularities. Cambridge University Press, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

service), SpringerLink (Online, ed. Quantum Mechanics in the Geometry of Space-Time: Elementary Theory. Roger Boudet, 2011.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Cardone, Fabio. Deformed spacetime: Geometrizing interactions in four and five dimensions. Springer, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Seymour, Percy. The elementary particles as stable and unstable localized energy modes in electrified space-time. William Day Planetarium, 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

The geometry of special relativity. Taylor & Francis, 2012.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

When the universe took a u-turn. World Scientific, 2010.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Harrigan, James. Timeliness, trade and agglomeration. Centre for Economic Performance, London School of Economics and Political Science, 2004.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Harrigan, James. Timeliness, trade and agglomeration. National Bureau of Economic Research, 2004.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Physical tire model"

1

Sarkisov, Pavel, Günther Prokop, and Sergey Popov. "The non-steady-state tire model as a set of physical submodels for driver assistance systems analysis." In 6th International Munich Chassis Symposium 2015. Springer Fachmedien Wiesbaden, 2015. http://dx.doi.org/10.1007/978-3-658-09711-0_50.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Tsujimoto, Tetsuro. "Distorted Model and Time Scale Evaluation of Multiscale Subjected Fluvial Processes." In Movable Bed Physical Models. Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-2081-1_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Lehmann, Sascha, Sven-Thomas Antoni, Alexander Schlaefer, and Sibylle Schupp. "A Quantitative Metric Temporal Logic for Execution-Time Constrained Verification." In Cyber Physical Systems. Model-Based Design. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-23703-5_9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Akhmet, Marat, and Mehmet Onur Fen. "Chaos Generation in Continuous/Discrete-Time Models." In Nonlinear Physical Science. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47500-3_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Lorente, Miguel. "Physical Models on Discrete Space and Time." In Symmetries in Science II. Springer US, 1986. http://dx.doi.org/10.1007/978-1-4757-1472-2_28.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Lee, Wonseok, Jaehwan Jeong, Seonghyeon Park, and Chang-Gun Lee. "Practical Multicore Extension of Functionally and Temporally Correct Real-Time Simulation for Automotive Systems." In Cyber Physical Systems. Model-Based Design. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-41131-2_7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Dannecker, Lars. "Optimizations on the Physical Layer: A Forecast-Model-Aware Time Series Storage." In Energy Time Series Forecasting. Springer Fachmedien Wiesbaden, 2015. http://dx.doi.org/10.1007/978-3-658-11039-0_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Baskin, E. M., and G. V. Zilberstein. "Diffusion Equation with Fractional Time Derivative—Physical Sense and Practical Realization." In Continuum Models and Discrete Systems. Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2316-3_45.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Figari, Rodolfo, and Alessandro Teta. "A Time-Dependent Analysis of Mott’s Model." In SpringerBriefs in Physics. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40916-5_2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Hsieh, Bernard B. "Communicating Artificial Neural Networks with Physical-Based Flow Model for Complex Coastal Systems." In Time Series Analysis and Forecasting. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28725-6_23.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Physical tire model"

1

Yi, Jingang. "On the Hybrid Physical/Dynamic Tire/Road Friction Model." In ASME 2009 Dynamic Systems and Control Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/dscc2009-2548.

Full text
Abstract:
We present new development of a hybrid physical/dynamic tire/road friction model for real-time friction estimation and control. We extend the LuGre tire/road friction model by considering the physical model-based deformation distribution on the tire/road contact patch. Relationship between the physical friction model and the LuGre dynamic friction model has been built and developed. We have shown that the LuGre dynamic friction model predicts the similar deformation and stress characteristics of the physical model, and therefore the friction model parameters can be interpreted with physical meaning and estimated experimentally. We demonstrate preliminary model comparison study through the “smart tire” sensor measurements on a mobile robot platform.
APA, Harvard, Vancouver, ISO, and other styles
2

Gil, Gibin, and Jeongheon Park. "Physical Handling Tire Model Incorporating Temperature and Inflation Pressure Change Effect." In WCX World Congress Experience. SAE International, 2018. http://dx.doi.org/10.4271/2018-01-1338.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Mancosu, Federico, Roberto Sangalli, Federico Cheli, and Stefano Bruni. "A New Mathematical-Physical 2D Tire Model for Handling Optimization on a Vehicle." In International Congress & Exposition. SAE International, 1999. http://dx.doi.org/10.4271/1999-01-0789.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Ishihama, Masao, Akane Shimizu, Yu Kakumoto, and Masato Hayashi. "Tire Sound Quality Evaluation Tool Using Sound Synthesis With Physical Modeling." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41142.

Full text
Abstract:
A computer aided tool for tire sound quality evaluation was developed. Automotive engineers can evaluate a tire structure by listening to synthesized sound that the tire would radiate when it rolls on a specific type of road surface. Among three kinds of tire sound, this study dealt with only the tire sound that radiates through its structural vibration caused by road surface texture excitation. The tool can be used on personal computers. To make it happen, tire sound radiation process is modeled into two parts. One is excitation. Tire deformation at the contact patch was calculated from road surface texture database by rolling contact analyses using multi-body dynamics simulation software. The model includes rolling tire structure model with contact compliance and simple suspension system for the wheel axle. Observation of the calculation results gives such an insight that excitation waveforms from road surface have prominent peaks that occur only at high peaks isolated from others, and do not have dips. This transformation process from road surface waveform to excitation is more accurate than tire envelope model and also not prohibitive considering today’s low-price computing power. The other process is tire structure vibration response. By limiting the usage of tire structure models just in representing over all vibration modal responses to road surface excitations in relatively low frequency range, a simple structural finite element model (FEM) was created. In this FEM, tire wall composite structures are modeled as assembly of solid elements with uniform material properties. The trick in using this FEM model lies in its boundary condition setting. By measuring vibration transfer functions from many points on a contact patch to tire tread and sidewalls, excitation in the middle of the contact patch was found to be blocked to travel to the sidewalls in higher frequency range due to the contact restriction on the periphery of the patch. This finding is essential in giving suitable boundary conditions to the FEM model and choosing the excitation points. To make the computing time minimum for synthesis, the vibration responses of the tire are represented by infinite impulse response (IIR) digital filter banks. The waveform obtained by applying the measured road texture waveforms to the IIR filter, was transferred to sound waves by the sound command of Matlab. By modifying the IIR filter, automotive engineers can judge the effect of tire structural design changes.
APA, Harvard, Vancouver, ISO, and other styles
5

Yi, Jingang, and Eric H. Tseng. "Nonlinear Stability Analysis of Vehicle Lateral Motion With a Hybrid Physical/Dynamic Tire/Road Friction Model." In ASME 2009 Dynamic Systems and Control Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/dscc2009-2717.

Full text
Abstract:
We present a nonlinear analysis of vehicle motion using a hybrid physical/dynamic tire/road friction model. The advantage of the proposed LuGre dynamic tire/road friction model is the simple and attractive structural properties for real-time friction estimation and control. Moreover, the model provides a property of capturing coupling effects between the longitudinal and lateral friction forces. We take advantages of these properties and analyze the vehicle lateral motion stability. We have shown that the existence of longitudinal slip affects the lateral motion stability. The quantitative analysis and relationship are also demonstrated through numerical simulation examples.
APA, Harvard, Vancouver, ISO, and other styles
6

Ali, Rustam, Moustafa El-Gindy, Ranvir Dhillon, Trivedi Mukesh, Fredrik Öijer, and Inge Johansson. "Prediction of Tire Ground Interaction Using FEA Truck Tire Models." In ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70100.

Full text
Abstract:
The advancement of computerized modeling has allowed for the creation of extensive pneumatic tire models. These models have been used to determine many tire properties and tire-road interaction parameters which are either prohibitively expensive or unavailable with physical models. This paper focuses on the prediction of tire-ground interaction with emphasis on individual and combined effect of tire slip angle and camber angle at various operating parameters. The forces generated at tire contact such as rolling resistance, cornering force, aligning moment and overturning moment can be predicted and used to optimize the tire design parameters. In addition to above stated, the three-groove FEA truck tire model representing radial-ply tire of size 295/75R22.5 was used in vertical load deflection test to determine enveloping characteristics under various load conditions and inflation pressures.
APA, Harvard, Vancouver, ISO, and other styles
7

Bastiaan, Jennifer M., and Amir Khajepour. "Finite Element Modeling of Tire With Validation Using Tensile and Frequency Response Testing." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-38286.

Full text
Abstract:
A physical testing program is performed in support of finite element model creation for a 50-series passenger car tire. ABAQUS finite element analysis software is used along with its standard material models. Uniaxial tension testing of tire samples cut from the tread composite, tread rubber and sidewall composite is performed in order to obtain material properties. Hyper-elastic material coefficients for tread rubber are fit using uniaxial tension test data. Results show that the Arruda-Boyce hyper-elastic material model fits the test data well and it predicts reasonable overall behavior in uniaxial tension and uniaxial compression. Most other hyperelastic material models are found to predict unrealistic behavior in uniaxial compression for the tire samples, especially in the 0 to 20% compressive strain range. Frequency response testing of two inflated passenger car tires of different sizes, makes and models is also performed to assist in defining the viscoelastic material model for tread rubber. Test results show that tire modal damping is in the 2 to 4% range for most modes below 200 Hz, and the response curves, modal density and modal damping are remarkably similar for the two tires tested. The tire finite element model with updated material properties is simulated for nine combinations of air inflation pressure and vertical load in order to calculate static loaded radius. The analysis results are compared with physical test results and the analysis results are found to deviate at most by 3% compared to the tests.
APA, Harvard, Vancouver, ISO, and other styles
8

Sanghvi, Pravesh, Harry Dankowicz, and Bernard E. Romig. "A Steady State Model of the Contact Between a Deformable Tire and a Deformable Terrain." In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28318.

Full text
Abstract:
This paper presents a lumped-parameter, planar, physical model for capturing steady-state interactions between a deformable tire and a deformable terrain. The model includes effects due to tangential and normal compliance of the terrain surface as well as radial and circumferential compliance of the tire. In addition, shear failure and dry friction limits are introduced through a distinction between regions along the circumferential direction of the tire that are in local stick or slip, respectively. The time history of interactions between individual infinitesimal patches of the tire and the terrain is then described by a hybrid dynamical system, in which changes between individual phases of motion are triggered by characteristic events. The paper further illustrates the application of a non-linear regression technique for identification of the seven model parameters and, in selected cases additional unknown kinematic variables. Specifically, the model is fit to experimental load-deflection, gross-thrust, and net-pull data demonstrating good quantitative agreement.
APA, Harvard, Vancouver, ISO, and other styles
9

Kuwayama, Isao, Fernando Baldoni, and Federico Cheli. "A Full Vehicle Model for the Development of a Variable Camber Suspension." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34679.

Full text
Abstract:
The accuracy of the recent vehicle dynamics simulation technology, represented by Multi-Body Simulations along with reliable tire models, has been remarkably progressing and provides reasonable simulation results not only for conventional passive vehicles but also for advanced active vehicles equipped with electronic components; however, when it comes to advanced vehicle applications with complex active systems, the complexity causes a longer simulation time. On the other hand, even though simple numerical vehicle simulation models such as single-track, two-track and a dozen degrees of freedom (dofs) models can provide less information than those of multi-body models, they are still appreciated by specific applications particularly the ones related to the development of active systems. The advantages of these numerical simulation models lie in the simulation platform, namely the Matlab/Simulink environment, which is suitable for modeling electronic components. In this paper, an 18 dofs vehicle model has been proposed for the development of a type of active suspension named Variable Camber which has an additional degree of freedom in camber angle direction and a description of the models and some preliminary results are reported: the control strategy for the variable camber suspension will be published ([3]). The model can reproduce a passive vehicle with a passive suspension as well; all the necessary dimensions, parameters, and physical properties are derived from a specific multi-body full vehicle model which has been fully validated with respect to a real one on the track. As for a tire model, Magic Formula 5.2 has been implemented on both the numerical and the multi-body vehicle models respectively so that the same tire model can be applied.
APA, Harvard, Vancouver, ISO, and other styles
10

Catania, Giuseppe, Luca Leonelli, and Nicolò Mancinelli. "A Multibody Motorcycle Model for the Analysis and Prediction of Chatter Vibrations." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62903.

Full text
Abstract:
The chatter phenomenon, appearing during high speed cornering maneuvers performed by racing motorcycles, consists of a self-excited vertical oscillation of both the front and rear unsprung masses in the range of frequency between 17 and 22 Hz. The suspensions are not generally able to dampen the above vibrations which start from the rear wheel and suddenly propagate to the front wheel during the corner entry phase, making the vehicle’s handling unpredictable and, ultimately, weakening the overall performance, that is the lap time. It is not clear which is the determining factor causing this phenomenon. Therefore, numerical simulation on a three dimensional, multibody motorcycle model is proposed, taking into account the effects of the major parameters involved, in order to highlight which of them takes part in the vibration. Accurate models for tire and drivetrain have been developed, making it possible to consider tire carcass deformability, chain transmission in both traction and braking states, full drivetrain inertia and anti-hop clutch effect. A critical maneuver experimentally measured on the race track is analyzed. The modal response of the linearized system is evaluated for several configurations extracted from the maneuver. The above maneuver is then simulated with the model, showing the actual vibration uprising. A critical discussion of the possible physical interpretations of the phenomenon is given.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Physical tire model"

1

Maydykovskiy, Igor, and Petras Užpelkis. The Physical Essence of Time. Intellectual Archive, 2020. http://dx.doi.org/10.32370/iaj.2450.

Full text
Abstract:
The article considers the model of the space-frequency-time continuum, according to which the physical essence of Time is manifested as a fraction of electromagnetic energy spent on updating a material object in a cyclic process of copying-incarnation. For all structural levels of physical reality, the value of this fraction is a fundamental constant, which can be represented as the tangent of the loss angle, or expressed in radians, as the angle of inclination of the evolutionary spiral, which characterizes the rate of change of states or the duration of events and processes. The value of this constant can be calculated, and its value turns out to be identically equals to the square of the fine structure Constant (α2). The description of the method for identifying a new constant allows us to present the formula of Scientific Discovery as the Physical Essence of Time.
APA, Harvard, Vancouver, ISO, and other styles
2

Eidson, John C., Edward A. Lee, Slobodan Matic, Sanjit A. Seshia, and Jia Zou. Time-Centric Models For Designing Embedded Cyber-physical Systems. Defense Technical Information Center, 2009. http://dx.doi.org/10.21236/ada538747.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Maydykovskiy, Igor, and Petra Užpelkis. The Concept of space-time quanta in future technologies. Intellectual Archive, 2020. http://dx.doi.org/10.32370/iaj.2464.

Full text
Abstract:
The article discusses the possibility of using the technological advantages that appear in connection with the discovery of the physical essence of Time and new interpretation of the structure of space in the form of space-time quanta. One of the problems that can be successfully solved on the basis of the new physical model is the problem of establishing the true nature of gravity. The solution to this problem is directly related to the implementation of the idea of unsupported motion based on the interaction in a certain way of the created asymmetric interference structure of longitudinal waves with the natural structure of spatial frequencies.
APA, Harvard, Vancouver, ISO, and other styles
4

Shillito, Rose, Markus Berli, and Teamrat Ghezzehei. Quantifying the effect of subcritical water repellency on sorptivity : a physically based model. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41054.

Full text
Abstract:
Soil water wettability or water repellency is a phenomenon that can affect infiltration and, ultimately, runoff. Thus, there is a need to develop a model that can quantitatively capture the influence of water repellency on infiltration in a physically meaningful way and within the framework of existing infiltration theory. The analytical model developed in this study relates soil sorptivity (an infiltration parameter) with contact angle (a direct measure of water repellency) for variably saturated media. The model was validated with laboratory experiments using a silica sand of known properties treated to produce controlled degrees of water repellency. The measured contact angle and sorptivity values closely matched the model‐predicted values. Further, the relationship between the frequently used water drop penetration time test (used to assess water repellency) and sorptivity was illustrated. Finally, the direct impact of water repellency on saturated hydraulic conductivity was investigated due to its role in infiltration equations and to shed light on inconsistent field observations. It was found that water repellency had minimal effect on the saturated hydraulic conductivity of structureless sand. A quantitative model for infiltration incorporating the effect of water repellency is particularly important for post‐fire hydrologic modeling of burned areas exhibiting water repellent soils.
APA, Harvard, Vancouver, ISO, and other styles
5

LeGrand, Sandra, Christopher Polashenski, Theodore Letcher, Glenn Creighton, Steven Peckham, and Jeffrey Cetola. The AFWA dust emission scheme for the GOCART aerosol model in WRF-Chem v3.8.1. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/41560.

Full text
Abstract:
Airborne particles of mineral dust play a key role in Earth’s climate system and affect human activities around the globe. The numerical weather modeling community has undertaken considerable efforts to accurately forecast these dust emissions. Here, for the first time in the literature, we thoroughly describe and document the Air Force Weather Agency (AFWA) dust emission scheme for the Georgia Institute of Technology–Goddard Global Ozone Chemistry Aerosol Radiation and Transport (GOCART) aerosol model within the Weather Research and Forecasting model with chemistry (WRF-Chem) and compare it to the other dust emission schemes available in WRF-Chem. The AFWA dust emission scheme addresses some shortcomings experienced by the earlier GOCART-WRF scheme. Improved model physics are designed to better handle emission of fine dust particles by representing saltation bombardment. WRF-Chem model performance with the AFWA scheme is evaluated against observations of dust emission in southwest Asia and compared to emissions predicted by the other schemes built into the WRF-Chem GOCART model. Results highlight the relative strengths of the available schemes, indicate the reasons for disagreement, and demonstrate the need for improved soil source data.
APA, Harvard, Vancouver, ISO, and other styles
6

Poppeliers, Christian, Katherine Anderson Aur, and Leiph Preston. The use of atmospheric prediction models to invert infrasound for linear-equivalent time domain moment tensors: Source Physics Experiment Phase 1. Office of Scientific and Technical Information (OSTI), 2018. http://dx.doi.org/10.2172/1468382.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Maslowski, Wieslaw, Andrew Roberts, John Cassano, and Mimi Hughes. Physically Consistent Eddy-resolving State Estimation and Prediction of the Coupled Pan-Arctic Climate System at Daily to Interannual Time Scales Using the Regional Arctic Climate Model (RACM). Defense Technical Information Center, 2012. http://dx.doi.org/10.21236/ada572173.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Zilberman, Mark. Methods to Test the “Dimming Effect” Produced by a Decrease in the Number of Photons Received from Receding Light Sources. Intellectual Archive, 2021. http://dx.doi.org/10.32370/ia_2021_06_22.

Full text
Abstract:
The hypothetical “Dimming effect” describes the change of the number of photons arriving from a receding light source per unit of time. In non-relativistic systems,the "Dimming effect" occurs due to the fact that as light sources move away, the distance between the emitter and the receiver constantly increases, and the photons always take longer to reach the receiver. This reduces the number of photons received per time unit compared to the number of emitted photons per time unit. Negligible for speeds incomparable with the speed of light c, the "Dimming effect" can be very significant for speeds above 0.1c. “Dimming effect” can possibly be tested in a physics labor-atory using a moving light source (or mirror) and photon counters located in the travel direction and in opposite direction. It can possibly also be tested utilizing the orbital movement of the Earth around the Sun. If confirmed, “Dimming effect” would allow astronomers to adjust values of the "Standard Candles", which are critical in cosmological models. Absence of “Dimming effect” will mean that the number of photons arriving per time unit does not depend on the relative speed of light source and observer,which is not so apparent
APA, Harvard, Vancouver, ISO, and other styles
9

Berney, Ernest, Naveen Ganesh, Andrew Ward, J. Newman, and John Rushing. Methodology for remote assessment of pavement distresses from point cloud analysis. Engineer Research and Development Center (U.S.), 2021. http://dx.doi.org/10.21079/11681/40401.

Full text
Abstract:
The ability to remotely assess road and airfield pavement condition is critical to dynamic basing, contingency deployment, convoy entry and sustainment, and post-attack reconnaissance. Current Army processes to evaluate surface condition are time-consuming and require Soldier presence. Recent developments in the area of photogrammetry and light detection and ranging (LiDAR) enable rapid generation of three-dimensional point cloud models of the pavement surface. Point clouds were generated from data collected on a series of asphalt, concrete, and unsurfaced pavements using ground- and aerial-based sensors. ERDC-developed algorithms automatically discretize the pavement surface into cross- and grid-based sections to identify physical surface distresses such as depressions, ruts, and cracks. Depressions can be sized from the point-to-point distances bounding each depression, and surface roughness is determined based on the point heights along a given cross section. Noted distresses are exported to a distress map file containing only the distress points and their locations for later visualization and quality control along with classification and quantification. Further research and automation into point cloud analysis is ongoing with the goal of enabling Soldiers with limited training the capability to rapidly assess pavement surface condition from a remote platform.
APA, Harvard, Vancouver, ISO, and other styles
10

Zilberman, Mark. Methods to Test the “Dimming Effect” Produced by a Decrease in the Number of Photons Received from Receding Light Sources. Intellectual Archive, 2020. http://dx.doi.org/10.32370/iaj.2437.

Full text
Abstract:
The hypothetical “Dimming Effect” describes the change of the number of photons arriving from a moving light source per unit of time. In non-relativistic systems, the “Dimming effect” may occur due to the growing distance of light sources moving away from the receiver. This means that due to the growing distance, the photons continuously require more time to reach the receiver, which reduces the number of received photons per time unit compared to the number of emitted photons. Understandably, the proposed “Dimming effect” must be tested (confirmed or rejected) through observations. a. This article provides the formula for the calculation of “Dimming effect” values using the redshift parameter Z widely used in astronomy. b. The “Dimming effect” can possibly be detected utilizing the orbital movement of the Earth around the Sun. In accordance to the “Dimming effect”, observers on Earth will view 1.0001 more photons per time unit emitted by stars located near the ecliptic plane in the direction of the Earth orbiting the Sun. And, in contrast, observers will view only 0.9999 photons per time unit emitted by stars located near the ecliptic plane in the direction opposite to the Earth orbiting the Sun. Calculating precise measurements of the same stars within a 6-month period can possibly detect this difference. These changes in brightness are not only for specific stars, as the change in brightness takes place for all stars near the ecliptic in the direction of the Earth’s orbit around the Sun and in the opposite direction. c. The “Dimming effect” can possibly be detected in a physics laboratory using a moving light source (or mirror) and photon counters located in the direction of travel and in the opposite direction. d. In theory, Dilation of time can also be used for testing the existence of the “Dimming effect.” However, in experiments on Earth this effect appears in only the 14th digit after the decimal point and testing does not appear to be feasible. e. Why is it important to test the “Dimming effect?” If confirmed, it would allow astronomers to adjust values of "Standard Candles" used in astronomy. Since “Standard Candles” are critical in various cosmological models, the “Dimming effect” can correct models and/or reveal and support new models. If it is proved that the “Dimming effect” does not exist, it will mean that the number of photons arriving per unit of time does not depend on the speed of the light source and observer, which is not so apparent.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Physical tire model' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography