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Journal articles on the topic 'Curve radius'

Author: Grafiati

Published: 10 December 2022

Last updated: 31 July 2025

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1

Feng, Xiaojiu, Yongtian Xie, Shaofeng Liu, and Fujian Yang. "Influence and Optimization of Geometric Parameters for Small-Radius Curved Tunnel Based on Response Surface Method." Applied Sciences 13, no. 6 (2023): 3800. http://dx.doi.org/10.3390/app13063800.

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Compared with straight tunnels, small-radius curved tunnels are more common and have more complex influencing factors in urban underground traffic. Therefore, the seismic evaluation of small-radius curved tunnels is of great significance for the safe operation of underground structures. This paper used numerical analysis and the response surface method to analyze the influence of buried depth, curve angle and curve radius on the seismic response of a small-radius curved tunnel. For this purpose, seventeen three-dimensional (3D) numerical analysis models of the small-radius curved tunnel consid

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2

Wang, Pu, Daolin Si, Shuguo Wang, and Qiang Yi. "Study on Gage Widening Methods for Small-Radius Curves." Applied Sciences 11, no. 12 (2021): 5334. http://dx.doi.org/10.3390/app11125334.

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Existing gage widening standards and the influence of gage widening on the curve passing performance of trains and rail wear were examined. The existing gage widening theory can determine the minimum curve radius that needs to be widened, the widening value required by curves with different radii, and whether multiaxle locomotives can pass small-radius curves. However, it does not quantify the influence of the gage widening value on the curve passing performance and track maintenance workload. The range of the minimum curve radius that needs to be widened is 220–350 m, whereas some countries a

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3

Jose Andueza, Pedro. "Mathematical Models of Vehicular Speed on Mountain Roads." Transportation Research Record: Journal of the Transportation Research Board 1701, no. 1 (2000): 104–10. http://dx.doi.org/10.3141/1701-13.

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Mathematical models were developed to estimate vehicular speed on curves and tangents in mountain roads. The 85th percentile speed for curves was estimated by using the radius of the curve under consideration, the radius of the previous curve, sight distance in the curve, and tangent length before the curve. The average speed was calculated by using the radius of the curve under consideration, the radius of the previous curve, and sight distance. The 85th percentile and the average speed were estimated by using the radius of the previous curve and tangent length. Speeds adopted by drivers resp

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4

Loktev, Alexey Alexeevich, Vadim Vadimovich Korolev, Irina Viktorovna Shishkina, and Vladislav Sergeevich Kuskov. "Selection of shape for turnout curve of high-speed switches." Transport of the Urals, no. 3 (2020): 62–67. http://dx.doi.org/10.20291/1815-9400-2020-3-62-67.

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The main factor at determination of radius of turnout curve under the conditions of comfortable driving is the limitation of centrifugal acceleration increment amount per unit time. For this reason, at designing high-speed switches it is advisable to use variable-radius curves as a turnout curve. The paper considers variable-radius curves - cubic parabola, parabola of the fourth order and sine curve. On the basis of the comparative assessment it is established that the sine curve is the most acceptable variant for using as a turnout curve in high-speed switches.

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Lou, Ping, Yonghe Li, Hongbo Xiao, Zhengang Zhang, and Shide Lu. "Influence of Small Radius Curve Shield Tunneling on Settlement of Ground Surface and Mechanical Properties of Surrounding Rock and Segment." Applied Sciences 12, no. 18 (2022): 9119. http://dx.doi.org/10.3390/app12189119.

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Compared with straight tunnels, over-excavation occurs on the inner side of the curved section during shield construction of small radius curved tunnels, and the disturbance to the ground surface and mechanical properties of surrounding rock and segment are more severe. This paper establishes the numerical models of small radius curve tunnels and straight tunnels to study the characteristics of surface deformation caused by the shield excavation of small radius curved tunnels and the influence of shield construction parameters on ground settlement, surrounding rock deformation, and segment for

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6

He, Jiao Long, Shu Guang Chen, and Xin Sheng Zhang. "Research on Technology of Highway Curve and Slope Road Segment Alignment Safety Design." Applied Mechanics and Materials 204-208 (October 2012): 1665–68. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.1665.

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In the paper, Combination curved with slope road segment on the driving experiment , The paper is analyzed the curve and slope road segment on Gradient, Horizontal Curve Radius, Speed and heart rate these variables of the inherent relation and law. The model of the relationship of the longitudinal slope and horizontal curve radius and heart rate is set up. By employing regression analysis, Conduct quantitative analysis, calculation and can be determined by the minimum horizontal curve radius value of vertical slope corresponding to at different vehicle-speeds on curved with longitudinal slope,

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7

Xin, Chunfu, Zhenyu Wang, Pei-Sung Lin, Chanyoung Lee, and Rui Guo. "Safety Effects of Horizontal Curve Design on Motorcycle Crash Frequency on Rural, Two-Lane, Undivided Highways in Florida." Transportation Research Record: Journal of the Transportation Research Board 2637, no. 1 (2017): 1–8. http://dx.doi.org/10.3141/2637-01.

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The association between horizontal curve design (e.g., radius and type) on rural, two-lane, undivided highways and motorcycle crash frequency is not well documented in existing reports and publications. This study aimed to investigate the effects of design parameters and associated factors on the occurrence of motorcycle crashes with consideration of the issue of unobserved heterogeneity. A random-parameters negative binomial regression model was developed on the basis of data on 431 motorcycle crashes, which were collected on 2,179 horizontal curves along two-lane, undivided highways in Flori

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Mauriello, Filomena, Alfonso Montella, Mariano Pernetti, and Francesco Galante. "An Exploratory Analysis of Curve Trajectories on Two-Lane Rural Highways." Sustainability 10, no. 11 (2018): 4248. http://dx.doi.org/10.3390/su10114248.

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This paper is aimed at obtaining a better understanding of driving behavior on horizontal curves of two-lane rural highways in terms of trajectories in relation to the different curve radii and directions by a driving simulator experiment. The driving simulator experiment involved 50 drivers and eight classes of curve radii, ranging from 125 m to 800 m. Overall, 2000 curve trajectories were analyzed and classified. Six major classes were defined: (1) ideal behavior, (2) normal behavior, (3) driving close to the centerline, (4) driving outside in curve approach, (5) cutting, and (6) correcting.

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9

Himes, Scott, Richard J. Porter, Ian Hamilton, and Eric Donnell. "Safety Evaluation of Geometric Design Criteria: Horizontal Curve Radius and Side Friction Demand on Rural, Two-Lane Highways." Transportation Research Record: Journal of the Transportation Research Board 2673, no. 3 (2019): 516–25. http://dx.doi.org/10.1177/0361198119835514.

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AASHTO’s A Policy on Geometric Design of Highways and Streets, 6th Edition, provides design criteria for horizontal curve elements based on the point-mass model. The model equates the centripetal force needed to navigate a horizontal curve of a specific radius traveling at the design speed to the combination of superelevation rate and side friction needed to achieve that force. Few researchers have examined the safety impacts of horizontal curve radius, superelevation rate, and design speed through crash-based research. None of the research reviewed included the effects of design speed or supe

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10

Lutema, Mazuri, and Tindiwensi Edison. "Wear Analysis of Freight Train Within Different Curve Parameters." International Journal of Industrial and Manufacturing Systems Engineering 10, no. 1 (2025): 1–8. https://doi.org/10.11648/j.ijimse.20251001.11.

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Wheel profile optimization has improved the performance between the wheel tread and rail on freight railways, which are primarily made up of tangent tracks and large curved tracks. However, it is impossible to overlook the flange wear brought on by the sharp curves that run along the tracks and toward the yards. This paper aims at analyzing how different parameters like curve radius, superelevation and curving speed after a given distance of operation, such as 20000 km influence wear along the curve during operation. A multifaceted research approach combining modeling and data analysis techniq

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11

Chen, J. T., J. W. Lee, S. K. Kao, and Y. T. Chou. "Construction of a curve by using the state equation of Frenet formula." Journal of Mechanics 37 (2021): 454–65. http://dx.doi.org/10.1093/jom/ufab014.

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Abstract In this paper, the available formulae for the curvature of plane curve are reviewed not only for the time-like but also for the space-like parameter curve. Two ways to describe the curve are proposed. One is the straight way to obtain the Frenet formula according to the given curve of parameter form. The other is that we can construct the curve by solving the state equation of Frenet formula subject to the initial position, the initial tangent, normal and binormal vectors, and the given radius of curvature and torsion constant. The remainder theorem of the matrix and the Cayley–Hamilt

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12

Wang, Bin, Zhichuang Liao, and Sijing Guo. "Adaptive Curve Passing Control in Autonomous Vehicles with Integrated Dynamics and Camera-Based Radius Estimation." Vehicles 6, no. 3 (2024): 1648–60. http://dx.doi.org/10.3390/vehicles6030078.

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Autonomous vehicles frequently encounter performance degradation during high-speed cornering due to excessive speed and lateral acceleration, potentially leading to collisions or rollovers. This paper proposes a novel curve-passing control approach that first estimates the curve radius and then controls the steer and speed for smooth and comfortable handling. In particular, the curve radius is innovatively estimated using a combination of a camera-based lane detection model and a steering wheel dynamic model. The curve-passing control approach is validated on high-speed ramps and curves, demon

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13

Hasan, Nazmul. "Threshold Radius of a Ballasted CWR Curved Track: Curve Classification." Journal of Transportation Engineering, Part A: Systems 143, no. 7 (2017): 04017026. http://dx.doi.org/10.1061/jtepbs.0000054.

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Purwanto, Djoko, Amelia Kusuma Indriastuti, and Kami Hari Basuki. "Hubungan antara Kecepatan dan Kondisi Geometrik Jalan yang Berpotensi Menyebabkan Kecelakaan Lalu Lintas pada Tikungan." MEDIA KOMUNIKASI TEKNIK SIPIL 21, no. 2 (2016): 83. http://dx.doi.org/10.14710/mkts.v21i2.11234.

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To date, the traffic accident number on hairpin curve is still quite high. This is exacerbated by speeding driving behaviour of some road users.This research aims to identify the factors that cause traffic accidents and drivers’ behaviour at the curve; to review curve geometric design; and to develop a relationship among speed, curve geometric condition and the accident at the curve. This study simply reviewed three hairpin curves that were prone to be blackspots in Batang. The dominant factors that cause accidents were human error and road condition. The driver’s speeding behaviour was indica

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Montella, Alfonso, Francesco Galante, Filomena Mauriello, and Massimo Aria. "Continuous Speed Profiles to Investigate Drivers' Behavior on Two-Lane Rural Highways." Transportation Research Record: Journal of the Transportation Research Board 2521, no. 1 (2015): 3–11. http://dx.doi.org/10.3141/2521-01.

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To improve highway design consistency, several studies developed operating speed prediction models and investigated drivers' speed behavior. Most existing models are based on spot speed data that assume constant operating speed throughout the horizontal curves and occurrence of acceleration and deceleration only on tangents. To overcome limitations associated with existing models, this study investigated continuous speed profiles with an experiment that used a high-fidelity dynamic-driving simulator on a two-lane highway. A piecewise linear regression model and locally weighted regression scat

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16

Sharf Aldeen, Asame, Ali Abdi Kordani, Afshin Fallah, and Seyed Mohsen Hosseinian. "Safety Comparison of Simple and Spiral Horizontal Curves Based on Side Friction Factor Dynamic Modeling." Journal of Advanced Transportation 2023 (February 10, 2023): 1–23. http://dx.doi.org/10.1155/2023/7954346.

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A horizontal curve’s geometric design is considered an important factor in highway accidents, and simple and spiral curves are regarded as the most common types of horizontal curves. Various factors affect the safety of horizontal curves, one of the most important of which is the side friction factor in the horizontal curves. Therefore, in this study, the safety of simple and spiral horizontal curves was investigated for the E-class sedan, E-class SUV, and two-axle conventional truck based on the side friction factor. In this regard, CarSim and TruckSim vehicle dynamic simulation software were

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17

Maljković, Biljana, and Dražen Cvitanić. "Evaluation of design consistency on horizontal curves for two-lane state roads in terms of vehicle path radius and speed." Baltic Journal of Road and Bridge Engineering 11, no. 2 (2016): 127–35. http://dx.doi.org/10.3846/bjrbe.2016.15.

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Experimental investigation was conducted on a 24 km long segment of the two-lane state road to collect the driver behavior data. The research involved 20 drivers driving their own cars equipped with the GPS device. Considering the impact of path radius and speed on the side friction demand, the design consistency on horizontal curves was evaluated by determining the margins of safety. The analysis showed that the vehicle path radii were mainly smaller than curve radius, on average for 12%. Regression analysis indicated that the percentage difference between the curve radius and vehicle path ra

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18

You, Run Wei. "Safety Design on Small Radius Curve of Mountain Road." Applied Mechanics and Materials 587-589 (July 2014): 981–84. http://dx.doi.org/10.4028/www.scientific.net/amm.587-589.981.

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Bend of small radius curve is accident-prone locations. Taking small radius curve as research object, by researching on traveling track and design of widening small radius curve, super elevation, center line as well as security problems of traffic facilities, puts forward measures on safety design on small radius curve of mountain road.

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19

M., I. KAPITSA, V. BOBYR D., and Y. DESIAK A. "DETERMINING PERMISSIBLE SPEED OF TILTING TRAIN IN CURVED TRACK." Science and Transport Progress, no. 4(70) (September 5, 2017): 29–40. https://doi.org/10.15802/stp2017/109537.

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<strong>Purpose</strong><strong>. </strong>The main purpose of the article is to determine the permissible speed of the air-cushioned tilting train in curved track and to justify the expediency of operating this type of rolling stock on the railways of Ukraine to increase the speed, improve the passenger comfort and save the energy due to more uniform high-speed train driving.<strong>Methodology</strong><strong>. </strong>The determination of the maximum permissible speed of the tilted train in curved track involves the use of methods of linear and vector algebra and empirical formul

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20

Zheng, Zhanji, Yuxuan Xu, Zhenke Wang, Jiaqiang Rao, Heshan Zhang, and Jin Xu. "Unveiling Driving Risks and Geometric Parameter Relationships in Urban Underground Road Curves: A Real Vehicle Experiment." Applied Sciences 15, no. 7 (2025): 3646. https://doi.org/10.3390/app15073646.

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To clarify the operational characteristics and driving risks of urban underground road curves, a real vehicle driving experiment involving 20 subjects was conducted at the Jiefangbei Underground Ring Road in Chongqing. High-precision instruments were utilized to collect driving data, including vehicle speed, lateral acceleration, and longitudinal acceleration. Significance tests were performed on lateral acceleration, longitudinal acceleration, entering curve deceleration, and exiting curve acceleration. The driver behavior risk at curves was evaluated using G-G diagrams, and the distribution

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21

Zheng, Xue Lian, Xian Sheng Li, Cheng Wu Jiao, Gang Bai, and Yuan Yuan Ren. "Study on Road Geometric Alignment Parameters Based on Vehicle Handling Stability Simulation." Applied Mechanics and Materials 404 (September 2013): 273–79. http://dx.doi.org/10.4028/www.scientific.net/amm.404.273.

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Unreasonable road geometric alignment has a negative influence on vehicle handling stability, especially when vehicle drives with a high speed. For horizontal road alignment, radius and banking of circular curve are the most popular and important parameters. To investigate the influence of horizontal road alignment on vehicle handling stability, a 3 degrees-of-freedom vehicle dynamic model is established. Three road horizontal curves with different radius are established in Carsim environment to investigate the influence of curve radius on vehicle handling stability and four different banking

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22

Wang, Zhiqiang, and Zhenyu Lei. "Formation Mechanism of Metro Rail Corrugation Based on Wheel–Rail Stick–Slip Behaviors." Applied Sciences 11, no. 17 (2021): 8128. http://dx.doi.org/10.3390/app11178128.

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Field investigation shows that most corrugations occur on the inner rail surface of curved tracks with a radius of less than 700 m. In order to explore the formation mechanism of metro corrugation, the relationship between wheel–rail stick–slip characteristics and rail corrugation is studied by combining single wheelset curving and a rigid–flexible coupling model. The numerical results illustrate that the lateral torsional stick–slip vibration of inner rail–inner wheel of the guiding wheelset on the small radius curve eventually leads to the generation of inner rail corrugation, and the latera

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23

LIU, Zhixiang, Kang ZOU, and Zhan SUN. "Curve forming prediction of coal mine roadway based on RBF interpolation." PLOS ONE 18, no. 7 (2023): e0288753. http://dx.doi.org/10.1371/journal.pone.0288753.

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Underground roadway excavation is a complex process, especially roadway curved excavation. In addition, the rationality of the design of coal mine roadway excavation scheme directly affects the speed of roadway excavation. The more reasonable the scheme design, the more conducive to rapid excavation. In order to avoid the influence of invalid construction on the efficiency of roadway excavation, this paper studies the forming of roadway bend. Based on the analysis of the tunneling process of the roadway curve, the mathematical model of the roadway curve is established. Taking the turning radiu

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Popović, Zdenka, Luka Lazerević, and Nikolay Vatin. "Analysis of Track Gauge Widening in Curves with Small Radius." Applied Mechanics and Materials 725-726 (January 2015): 967–73. http://dx.doi.org/10.4028/www.scientific.net/amm.725-726.967.

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In this paper it was performed curve negotiation analysis of three axle bogie of locomotive type JŽ 461. This locomotive has large distance between first and middle i.e. middle and last axle, which leads to increased lateral forces during curve negotiation. Final result might be widening of track gauge in curves with small radius. This paper points that Infrastructure Manager must take into account vehicle performances and type of track when defines track gauge in curves.

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Koshkin, Sergiy, and Ivan Rocha. "Caustics of Light Rays and Euler's Angle of Inclination." PUMP Journal of Undergraduate Research 3 (October 22, 2020): 205–25. http://dx.doi.org/10.46787/pump.v3i0.2417.

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Euler used intrinsic equations expressing the radius of curvature as a function of the angle of inclination to find curves similar to their evolutes. We interpret the evolute of a plane curve optically, as the caustic (envelope) of light rays normal to it, and study the Euler's problem for general caustics. The resulting curves are characterized when the rays are at a constant angle to the curve, generalizing the case of evolutes. Aside from analogs of classical solutions we encounter some new types of curves. We also consider caustics of parallel rays reflected by a curved mirror, where Euler

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V. V. Pattabhiram, Yegulla, and P. Sravana. "Assessment of radius of curvature along the existing road networks." i-manager’s Journal on Civil Engineering 13, no. 4 (2023): 18. http://dx.doi.org/10.26634/jce.13.4.20294.

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The safety of traffic on roads is greatly influenced by various geometric features such as the radius of curvature, lane width, median width, and sight distance. The radius of the curve is an important parameter, that influences sight distance, design speed, and other parameters like superelevation, etc. For smaller radius curves the sight distance available also will be less, which will increase accident risks. The lower the radius of the curve, the lesser will be the sight distance, and so higher the accident risk (Abebe, 2019). The objective of this paper is to develop a tool for assessing

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Lawrence, Elizabeth A., and Christopher M. Copperwheat. "Light Curve of HT Cassiopeiae." Research Notes of the AAS 8, no. 1 (2024): 14. http://dx.doi.org/10.3847/2515-5172/ad1bc5.

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Abstract Photometric observations of the eclipsing dwarf nova HT Cas are presented in its quiescent state on 2022 October 20th for one complete orbital period. These data were taken with the RISE imager mounted on the Liverpool Telescope. The lcurve code was used to fit the light curve. System parameters were derived of mass ratio q = M 2/M 1 = 0.15 ± 0.01, angle of inclination i = 80.°98 ± 0.°18 and white dwarf radius of R 1 = 0.0128 ± 0.0003R ⊙. This gives solutions for the masses of the white dwarf and donor star of M 1 = 0.571 ± 0.017M ⊙ and M 2 = 0.088 ± 0.005M ⊙. The disk radius and brig

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Felipe, Emmanuel, and Francis Navin. "Automobiles on Horizontal Curves: Experiments and Observations." Transportation Research Record: Journal of the Transportation Research Board 1628, no. 1 (1998): 50–56. http://dx.doi.org/10.3141/1628-07.

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Statistical information on the basic variables involved in driving through a horizontal curve was obtained using a 4×4 Latin square design experiment to measure the action of automobile drivers in test track horizontal curves. The independent variables used in the test curves were speed (comfortable, fast); pavement surface (dry, wet); driver (male, female); and curve radius (16 m, 26 m, 60 m, 100 m). The measured output was the driver’s selected speed and corresponding lateral acceleration. In addition, the passengers indicated their comfort level on a four-point semantic scale. Expert driver

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Prakasa, Davin Eka. "Prediksi Usia Operasi Rel Lengkung Terhadap Rolling Contact Fatigue." Jurnal Teknik Transportasi 2, no. 2 (2023): 102–14. http://dx.doi.org/10.54324/jtt.v2i2.19.

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Curved based on Regulation of the Minister of Transportation No. 60 of 2012 Concerning Railway Track Technical Requirements has a minimum radius of 200 m, but in certain cases the curve radius can be planned to be less than the written regulations with special provisions. One of the track locations on the MRT Jakarta operating route has a radius of around 180 m, which is very interesting to discuss, especially in terms of wear which may occur greater than curves with a radius that meets the requirements in written regulations. Analysis of rail wear related to rail service life will be the main

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Wang, Cai Yun, Peng Shen, Wen Zhong, and Qi Yue Liu. "Numerical and Experiment Analysis of Rail Wear." Advanced Materials Research 189-193 (February 2011): 697–702. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.697.

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The rolling contact wear is a severe problem and meets with much widespread interest in the world. This paper describes an numerical method and simulation experiment investigation on the rail wear affected by the curve radius and axle load etc. The creep force ,stick/slip areas of contact particles, and friction work of wheel/rail in static condition are analyzed by kalker’s program CONTACT. The effect of curve radius and axle load on rolling wear behaviour of rail is investigated by simulation experiment. The results of numerical and experiment indicates that with the decreasing of curve radi

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Hasan, Moudud, Tarek Sayed, and Yasser Hassan. "Influence of vertical alignment on horizontal curve perception: effect of spirals and position of vertical curve." Canadian Journal of Civil Engineering 32, no. 1 (2005): 204–12. http://dx.doi.org/10.1139/l04-090.

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Several studies have shown that the perception of horizontal curves can be influenced by an overlapping vertical alignment. A previous two-phase study investigated the hypothesis that a horizontal curve appears flatter when overlapping with a vertical sag curve and sharper when overlapping with a vertical crest curve. The study concluded that the hypothesis was valid. The study also developed several statistical models to estimate the perceived radius of horizontal curves in a combined alignment. This study extends the earlier work by investigating the effect of additional geometric parameters

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Zhao, Liang, and Meng Li Zhang. "Influence of Radius of Horizontal Curve on Driver's Psychology and Physiology on the Two-Lane Mountain Highway." Applied Mechanics and Materials 226-228 (November 2012): 2335–39. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.2335.

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At the present time, the accident remains at a high level all over the world. It mostly happened on the two-lane mountain highway. Through analysis of the relationship between radius of horizontal curve and driving safety of the drivers on two-lane mountain highway, variations of heart rate was be introduced. The variations of heart rate will be changed with Radius of horizontal curve through qualitatively and quantitatively analysis. However, the maximum of drivers' heart rate does not occur on the limit radius of horizontal curve. It locates at the place slightly larger than the limit radius

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Magee, Jake, Caitlin M. Casey, Olivia R. Cooper, et al. "Rotation Curve Measurement of Dark Matter Content of a z ∼ 0.5 Galaxy." Research Notes of the AAS 7, no. 5 (2023): 110. http://dx.doi.org/10.3847/2515-5172/acd9a5.

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Abstract Measurements of galaxy rotation curves provide direct measurements of the distribution of baryonic and dark matter in galaxies. Here, we present spectroscopic confirmation and one such rotation curve for a z = 0.5325 galaxy observed with Keck I/MOSFIRE as a filler target for the Web Epoch of Reionization Survey. The rotation curve was derived from Hα 6563 Å emission out to a galactocentric radius of approximately 24 kpc. The target's rotation curve is well fit by an arctangent curve, that when combined with broadbanned photometric constraints on the galaxy’s stellar mass, predicts a d

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Easa, Said, and Essam Dabbour. "Establishing design guidelines for compound horizontal curves on three-dimensional alignments." Canadian Journal of Civil Engineering 32, no. 4 (2005): 615–26. http://dx.doi.org/10.1139/l05-016.

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In current design guides, the minimum radii of compound horizontal curves are based on the design requirements of simple horizontal curves for each arc on flat terrain. Such a design ignores the effects of compound curvature and vertical alignment. This paper uses computer simulation software to establish the minimum radius requirements for compound curves, considering these effects. The actual lateral acceleration experienced by a vehicle negotiating a two-dimensional (2-D) simple curve is recorded as a base scenario to facilitate the analysis of a compound curve on a flat terrain or combined

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Zheng, Binshuang, Xiaoming Huang, Junyao Tang, et al. "Evaluation on Braking Stability of Autonomous Vehicles Running along Curved Sections Based on Asphalt Pavement Adhesion Properties." Journal of Advanced Transportation 2022 (May 29, 2022): 1–20. http://dx.doi.org/10.1155/2022/7348554.

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As the main objective influencing factor on the brake safety of autonomous vehicles, pavement texture information is directly related to road surface antiskid performance. However, in the brake system of autonomous vehicles, the influence of road surface adhesion characteristics on braking stability is seldomly considered. To study the braking stability of autonomous vehicles on curved sections under different road conditions, the advanced close-range photogrammetry system was utilized to extract the road surface texture information. Thereafter, the power spectral density (PSD) of the road sur

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Shen, Peng, Cai Yun Wang, Zhong Wen, and Qi Yue Liu. "An Experimental Investigation on Railway Adhesion Properties under Water Medium and Dry Condition Respectively." Advanced Materials Research 189-193 (February 2011): 3554–59. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.3554.

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The effect of wheel speed, axle load and track curve radius on wheel/rail adhesion properties under dry and water medium condition was investigated in this paper using JD-1 wheel/rail simulation facilities with Hertz simulation method, and then testing method of “four horizontals and three factors” was adopted to analyze the influence degree of speed, axle load and track curve radius on wheel/rail adhesion. Results from the experiment are that: The adhesion coefficient reached maximum at creep ratio of 1.5% under dry condition, and 1% under wet condition respectively; the adhesion coefficient

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Kontomaris, Stylianos Vasileios, Andreas Stylianou, Georgios Chliveros, and Anna Malamou. "A New Elementary Method for Determining the Tip Radius and Young’s Modulus in AFM Spherical Indentations." Micromachines 14, no. 9 (2023): 1716. http://dx.doi.org/10.3390/mi14091716.

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Atomic force microscopy (AFM) is a powerful tool for characterizing biological materials at the nanoscale utilizing the AFM nanoindentation method. When testing biological materials, spherical indenters are typically employed to reduce the possibility of damaging the sample. The accuracy of determining Young’s modulus depends, among other factors, on the calibration of the indenter, i.e., the determination of the tip radius. This paper demonstrates that the tip radius can be approximately calculated using a single force–indentation curve on an unknown, soft sample without performing any additi

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Hauser, Vladimír, Olena S. Nozhenko, Kateryna O. Kravchenko, Mária Loulová, Juraj Gerlici, and Tomáš Lack. "Innovative wheel tread design aimed to tramcar-track interaction improvement when passing curves of a small radius." MATEC Web of Conferences 157 (2018): 03010. http://dx.doi.org/10.1051/matecconf/201815703010.

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Tramways in cities often ride in track curves of a small radius, which is followed by an increased effect of the vehicle on the track. In the rail - wheel contact often occurs creep in longitudinal as well as in lateral direction, which causes increase of riding resistance, wear in rail – wheel contact and noise operation. Exactly with the aim to reduce these undesirable effects we designed a tram bogie with steered wheelsets and with the double wheel tread. This inventions are registered by authors under Utility Model Nr. u201609015 and Patent Application Nr. a201701589. Description of propos

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Li, Rong Bin, and Can Cui. "Comparison and Research of Thermocouple Measuring Temperature Curve and Theoretical Temperature Curve in Grinding." Applied Mechanics and Materials 454 (October 2013): 280–87. http://dx.doi.org/10.4028/www.scientific.net/amm.454.280.

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A Thermocoupletemperature measurement test of grinding for steel 45 was done to analyse thereason of errors between experimental temperature curve and theoreticaltemperature curve derived by triangular distribution heat source model.It wasshown that,errors of influencing factors,such as grinding heat flow,thermalconductivity,density,specific heat capacity,limited grinding energy andeffective abrasive contact radius,have certain effect on temperature measuredby thermocouple.It was found that the influence of grinding heat flow into aworkpiece is the biggest and the effective radius of abrasive

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Wang, Cai Yun, Peng Shen, and Qi Yue Liu. "Study on Using Numerical Method to Predict Wear Volume of Rail." Advanced Materials Research 335-336 (September 2011): 339–42. http://dx.doi.org/10.4028/www.scientific.net/amr.335-336.339.

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This paper describes an numerical method and simulation experiment investigation on the rail wear affected by the curve radius and axle load etc. the effects of curve radius and axle load on The effects of axle load and curve radius on total slippage of contact particles and friction work of wheel/rail are investigated with numerical methods are analyzed by kalker’s program CONTACT. The effect of curve radius and axle load on rolling wear behaviour of rail is investigated by simulation experiment. It is indicated that axle load and curve radius are important factors to effect rolling contact w

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Dong, Yaping, Jinliang Xu, Menghui Li, Xingli Jia, and Chao Sun. "Association of Carbon Emissions and Circular Curve in Northwestern China." Sustainability 11, no. 4 (2019): 1156. http://dx.doi.org/10.3390/su11041156.

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Carbon emissions, produced by automobile fuel consumption, are termed as the key reason leading to global warming. The highway circular curve constitutes a major factor impacting vehicle carbon emissions. It is deemed quite essential to investigate the association existing between circular curve and carbon emissions. On the basis of the IPCC carbon emission conversion methodology, the current research work put forward a carbon emission conversion methodology suitable for China’s diesel status. There are 99 groups’ test data of diesel trucks during the trip, which were attained on 23 circular c

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Sushmitha, Ramireddy, Jithender Jatoth, Anoop Raj, and KVR RAVISHANKAR. "INFLUENCE OF TRAFFIC AND VEHICULAR CHARACTERISTICS ON LATER SHIFT OF VEHICLES UNDER VARYING ROADWAY AND GEOMETRIC CONDITIONS." Suranaree Journal of Science and Technology 31, no. 6 (2025): 010346(1–10). https://doi.org/10.55766/sujst-2024-06-e05278.

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The present study is carried out to analyze the lateral shift of different vehicle types while traversing on a horizontal curve with influence of geometrical elements and average speed of the traffic stream. Four different curves with varying radius of curvature and deflection angles were selected in Warangal city. Different vehicle categories were considered such as two-wheeler, car, and three-wheeler to analyze the lateral shifts in the field. The results of the study showed that two wheelers were more affected by the average speed of the traffic, whereas for cars, the overall width of the r

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Ibragimov, S. A. "Investigation of the dependences of the Vivaldi antenna with two curve radii in the electrodynamic modeling software package." Herald of Dagestan State Technical University. Technical Sciences 49, no. 1 (2022): 49–58. http://dx.doi.org/10.21822/2073-6185-2022-49-1-49-58.

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Objective. The aim of the study is to build and optimize a computer model of the antenna using software packages for electrodynamic modeling.Method. The study is based on dynamic modeling methods.Result. In this paper, the dependences of the width of the radiation pattern on the curved Vivaldi antenna with a mirror arrangement of the petals are obtained. Graphs of the dependence of the radii of curved petals and aperture values on the width of the radiation pattern in two planes for frequencies of 3 and 24 GHz are plotted. Curve radius, antenna aperture and lower antenna height are plotted as

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Zheng, Xuelian, Lijuan Yu, Yuanyuan Ren, Xiansheng Li, Biao Liang, and Jianfeng Xi. "Modeling of Tank Vehicle Rollover Risk Assessment on Curved–Slope Combination Sections for Sustainable Transportation Safety." Sustainability 17, no. 3 (2025): 906. https://doi.org/10.3390/su17030906.

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Tank vehicles are highly prone to rollover accidents, especially on curved–slope combination sections, which can cause hazardous chemical spills, endangering the environment, public safety, and human health. Therefore, it is crucial to conduct research aimed at reducing the risk of such incidents. Method: The rollover risk of tank vehicles under various loading conditions while traveling on curved–slope combination sections was investigated using driver–vehicle–road dynamics simulation. A multiple linear regression model was then developed to further quantify the impact of key factors on the r

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Rondora, Maria Emilia Schio, Ali Pirdavani, and Ana Paula C. Larocca. "Driver Behavioral Classification on Curves Based on the Relationship between Speed, Trajectories, and Eye Movements: A Driving Simulator Study." Sustainability 14, no. 10 (2022): 6241. http://dx.doi.org/10.3390/su14106241.

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Horizontal curves of rural highways are prone to a considerably high number of fatalities because an erroneous perception can lead to unsafe driving. This generally occurs when a driver fails to notice the highway geometry or changes in the driving environment, particularly curved segments. This study aimed to understand the geometric characteristics of curved segments, such as radius and approach tangents, on the driving performance towards minimizing vehicle crashes. Speed profiles and lateral position, the most common indicators of successful negotiation in curves, and eye movements were re

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Dias, Charitha, Takashi Oguchi, and Kasun Wimalasena. "Drivers’ Speeding Behavior on Expressway Curves: Exploring the Effect of Curve Radius and Desired Speed." Transportation Research Record: Journal of the Transportation Research Board 2672, no. 17 (2018): 48–60. http://dx.doi.org/10.1177/0361198118778931.

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Speed profiles can be considered as a key input for assessing safety, comfort and efficiency of highway or expressway segments. Therefore, understanding drivers’ speeding behavior, particularly on expressway curve sections, is important. Most previous studies have modeled the speed on highway curve sections mainly as constant or a piecewise linear profile. Such approaches may not realistically represent the properties of speed and acceleration behavior. Furthermore, mechanisms underlying the speeding behavior through curve sections have not been comprehensively studied. In this study, the mini

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Fitzpatrick, Kay, C. Brian Shamburger, Raymond A. Krammes, and Daniel B. Fambro. "Operating Speed on Suburban Arterial Curves." Transportation Research Record: Journal of the Transportation Research Board 1579, no. 1 (1997): 89–96. http://dx.doi.org/10.3141/1579-11.

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Free-flow speeds were collected at both a control section and a curve section at 14 surburban sites with horizontal curves and 10 suburban sites with vertical curves. The scatter plots of the 85th percentile speed versus approach density indicate that when the approach density is between 3 and 15 approaches per km, approach density does not influence speed. Regression analysis indicated that the curve radius for horizontal curves and the inferred design speed for vertical curves can be used to predict the 85th percentile speed on curves for vehicles on the outside lane of a four-lane divided s

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Zeng, Wei, Yue Yang, Wen-Sheng Qiu, Huan Xie, and Su-Chao Xie. "Optimization of the target profile for asymmetrical rail grinding in sharp-radius curves for high-speed railways." Advances in Mechanical Engineering 9, no. 2 (2017): 168781401668719. http://dx.doi.org/10.1177/1687814016687196.

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Asymmetrical rail grinding in sharp-radius curves could reduce the side wear of railheads and enhance curve capacity of rail vehicles. The wheel/rail contact performance and curve capacity could be further improved by the optimization of the asymmetrical rail grinding target profile. In order to modify the target profile smoothly, the nonuniform rational B-spline curve with adjustable weight factors is used to establish a parameterized model of railhead curves in the asymmetrical grinding region. The indices of contact performance and curve capacity for different weight factors are obtained us

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Lian, Guofu, Yang Zhang, Hao Zhang, Xu Huang, Changrong Chen, and Jibin Jiang. "Investigation of Geometric Characteristics in Curved Surface Laser Cladding with Curve Path." Metals 9, no. 9 (2019): 947. http://dx.doi.org/10.3390/met9090947.

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Laser cladding on curved surfaces is essential in industrial applications for restoration and remanufacturing of high-value parts. This study investigated the influence of different factors on clad width, clad height, and dilution rate in curved surface laser cladding with curved path. Mathematical models were developed using central composite designs to predict these geometric characteristics by controlling laser power, scanning speed, gas flow, and altering the outside radius of the cylindrical substrate. Analysis of variance and response surface methodology indicated that clad width increas

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Bruce, J. W., and P. J. Giblin. "Growth, motion and 1-parameter families of symmetry sets." Proceedings of the Royal Society of Edinburgh: Section A Mathematics 104, no. 3-4 (1986): 179–204. http://dx.doi.org/10.1017/s030821050001917x.

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SynopsisAssociated to every plane curve there is the locus of centres of circles bitangent to that curve, the so-called symmetry set of the curve. We can view this set as the spine of our curve, which can be recovered by taking the envelope of circles of varying radii along this spine. Varying the symmetry set in some isotopy while keeping the radius function fixed may be viewed as crudely modelling motion of the original curve viewed as a biological object. Fixing the symmetry set and varying the radius function can be considered to model growth crudely. In this paper we shall describe the ge

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