Relevant bibliographies by topics / Space-track / Journal articles

Journal articles on the topic 'Space-track'

To see the other types of publications on this topic, follow the link: Space-track.
Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Space-track.'

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.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Aldhous, Peter. "Space station back on track." Nature 351, no. 6327 (June 1991): 507. http://dx.doi.org/10.1038/351507b0.

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

Marks, Paul. "New space radars aim to track tiny space junk." New Scientist 213, no. 2857 (March 2012): 24. http://dx.doi.org/10.1016/s0262-4079(12)60749-0.

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

Ritchie, KL, AR Hunt, and A. Sahraie. "Keeping Track of Locations in Space." i-Perception 3, no. 6 (July 2012): 384. http://dx.doi.org/10.1068/ie384.

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

Beardsley, Tim. "Space telescope: Users agree on inside track." Nature 313, no. 6001 (January 1985): 337. http://dx.doi.org/10.1038/313337b0.

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

O'Donnell, Franklin. "Getting space camera back on track soon." Nature 415, no. 6873 (February 2002): 732. http://dx.doi.org/10.1038/415732d.

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

McDowell, Jonathan C. "Further Out: Keeping Track of Deep Space Objects." International Institute of Space Law 62, no. 4 (April 2019): 317–27. http://dx.doi.org/10.5553/iisl/2019062004002.

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

Jihong, Yang, and Yun Lu. "Behavior recognition based on track space-time characteristics." Journal of Intelligent & Fuzzy Systems 39, no. 6 (December 4, 2020): 8675–84. http://dx.doi.org/10.3233/jifs-189263.

Full text
Abstract:
Under the influence of novel corona virus pneumonia epidemic prevention and control, higher requirements for behavior recognition in complex environment are put forward. The accuracy of traditional methods for sports training is not high, so a method is needed to improve the local action recognition to assist sports training. In the process of behavior recognition, if only the track is regarded as an independent individual, the information of its neighbor will be ignored. Therefore, we use KNN algorithm to get the nearest neighbor trajectory. In order to calculate the rich neighborhood information around the track, this paper calculates the complex relationship between the center track and the neighborhood track from four different angles, including absolute motion, relative motion, distance relationship and direction relationship. Then, from the four different perspectives of variance, discrete coefficient, skewness and kurtosis, this paper proposes a large interval nearest neighbor coding method. This method makes the four eigenvalues complement each other and improves the ability of describing complex and changeable behaviors. The experimental results show that the coding method proposed in this paper can be used for behavior recognition according to different transformation matrix.
APA, Harvard, Vancouver, ISO, and other styles
8

Enulescu, Marius. "Space Time – Track Circuits with Trellis Code Modulation." Advances in Science, Technology and Engineering Systems Journal 2, no. 3 (July 2017): 1070–79. http://dx.doi.org/10.25046/aj0203136.

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

NAGANUMA, Yasukuni, Takahito KOBAYASHI, and Hitoshi TSUNASHIMA. "1021 Track condition monitoring using state space models." Proceedings of Conference of Kanto Branch 2012.18 (2012): 381–82. http://dx.doi.org/10.1299/jsmekanto.2012.18.381.

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

Gad, Ahmed, and Ossama Abdelkhalik. "Repeated Shadow Track Orbits for Space-SunSetter Missions." International Journal of Aerospace Engineering 2009 (2009): 1–13. http://dx.doi.org/10.1155/2009/561495.

Full text
Abstract:
This paper introduces a new set of orbits, the “Repeated Shadow Track Orbits.” In these orbits, the shadow of a spacecraft on the Earth visits the same locations periodically every desired number of days. The perturbation is utilized to synchronize the spacecraft shadow motion with both the Earth rotational motion and the Earth-Sun vector rotation. Motivation for the design of new shadow track orbits comes from the need to save energy. The general mathematical model to design a Repeated Shadow Track Orbit (RSTO) is presented within this paper. RSTOs' conditions are formulated and numerically solved. Results show the feasibility of RSTOs. An optimization process is also developed to maximize the shadow duration over a given site. A Genetic Algorithm (GA) technique is utilized for optimization.
APA, Harvard, Vancouver, ISO, and other styles
11

Kopp, J., R. Beaujean, G. Reitz, and W. Enge. "HZE dosimetry in space using plastic track detectors." Radiation Measurements 31, no. 1-6 (June 1999): 573–78. http://dx.doi.org/10.1016/s1350-4487(99)00120-1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
12

Bellamine, I., H. Silkan, and A. Tmiri. "Track color space-time interest points in video." Multimedia Tools and Applications 79, no. 33-34 (June 23, 2020): 24579–93. http://dx.doi.org/10.1007/s11042-020-09037-8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
13

Yilin, Zhu. "Fast-track development of space technology in China." Space Policy 12, no. 2 (May 1996): 139–42. http://dx.doi.org/10.1016/0265-9646(96)84109-9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
14

Lindsay, Beth Daniel. "Using Google Forms to track library space usage." Journal of Access Services 13, no. 3 (July 2, 2016): 159–65. http://dx.doi.org/10.1080/15367967.2016.1184578.

Full text
APA, Harvard, Vancouver, ISO, and other styles
15

Ananthaswamy, Anil. "4. Keep track of the body in space." New Scientist 232, no. 3093 (October 2016): 32–33. http://dx.doi.org/10.1016/s0262-4079(16)31798-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
16

Goldstein, Benjamin, and Joshua P. Newell. "How to track corporations across space and time." Ecological Economics 169 (March 2020): 106492. http://dx.doi.org/10.1016/j.ecolecon.2019.106492.

Full text
APA, Harvard, Vancouver, ISO, and other styles
17

Koc, Władysław. "An Analytical Approach to Intertrack Space Widening on Railroad Curves." Problemy Kolejnictwa - Railway Reports 65, no. 193 (December 2021): 83–95. http://dx.doi.org/10.36137/1933e.

Full text
Abstract:
The article addresses the issue of designing the geometry of a curved double track using the analytical design method principles. This allowed, similarly to other applications of the method, a complete overview of the issue and the method for determining the key parameters to be defined. The analytical method for determining the intertrack space axis and the outer and inner track axes is introduced, leading to the required value of the intertrack space widening. The widening is achieved by varying the length of the transition curves in the outer and inner tracks. With the track axis coordinates in the local coordinate system, these can be easily transferred to the PL-2000 two-dimensional Cartesian coordinate system, i.e., an element of the national spatial reference system. The analysis continues with the issue of the chainage of axes of the intertrack space and the mainline tracks. The applicability of the proposed method and its high precision are demonstrated by examining a wide radius range of circular curves. Keywords: railway track, widening of the intertrack space, determining the curved track axis, railway line chainage
APA, Harvard, Vancouver, ISO, and other styles
18

Zamyshliaev, A. M., A. N. Ignatov, A. I. Kibzun, and E. O. Novozhilov. "On traffic safety incidents caused by intrusion of derailed freight cars into the operational space of an adjacent track." Dependability 18, no. 3 (September 5, 2018): 39–45. http://dx.doi.org/10.21683/1729-2646-2018-18-3-39-45.

Full text
Abstract:
Aim.Derailments of rolling stock units (cars, locomotive units) of freight trains cause damage to roadbed and rolling stock, as well as possible loss of transported cargo. Of special interest are cases when derailed rolling stock units intrude into the operational space ofan adjacent track. This, for instance, happened in the case of the Moscow – Chișinșu train at the Bekasovo I – Nara line on May 20, 2014, when as a result of the derailment of freight cars with subsequent intrusion into the operational space of an adjacent track 6 people were killed as the result of collision with an opposing train. In some cases intruding units may collide with an opposing freight train, which may cause the death of that train’s crew and derailment of its cars, which in case of transportation of hazardous loads (e.g. oil and gasoline) may have catastrophic consequences. Intrusion into the operational space ofan adjacent track also interrupts the traffic in both directions. In this context, evaluating the probability of derailed cars intruding into the operational space of an adjacent track is extremely important in order to maintain the tolerable level of risk in railway transportation, while the aim of this paper is to construct functional dependences between the probability of derailed cars intruding into the operational space of an adjacent track and various factors.Methods. Probability theory and mathematical statistics methods were used: maximum likelihood method, logistic regression, probit regression, Cauchy regression.Results.For each of the groups of incidents: derailments due to faulty cars/locomotive units, derailments due to faulty track, using the classic binary choice model an estimation was constructed of the probability of at least one derailed freight car intruding into the operational space of an adjacent track. This estimation turned out to be dependent upon the train loading and number of derailed units. As the number of derailed units is a priori (before the derailment) unknown, it was suggested to construct the probability of intrusion by at least one derailed freight car into the operational space of an adjacent track using a parametric model of dependence between the average number of derailed units and various traffic factors. The resulting dependences were compared. A numerical example was examined.Conclusions.There is a significant direct correlation between the random values that characterize intrusion by at least one unit into the operational space of an adjacent track and the number of derailed freight train units. A direct dependence between the train loading and intrusion by derailed units into an adjacent track was established. In case of derailment due to faulty track, for loaded trains the probability of at least one derailed unit intruding into the operational space of an adjacent track is extremely high.
APA, Harvard, Vancouver, ISO, and other styles
19

Gehly, Steven, Brandon A. Jones, and Penina Axelrad. "Search-Detect-Track Sensor Allocation for Geosynchronous Space Objects." IEEE Transactions on Aerospace and Electronic Systems 54, no. 6 (December 2018): 2788–808. http://dx.doi.org/10.1109/taes.2018.2830578.

Full text
APA, Harvard, Vancouver, ISO, and other styles
20

Di Nunzio, F., V. Scoca, G. Blanco-Rodriguez, D. Ershov, and J. Y. Tinevez. "Live track of HIV genome in the nuclear space." Journal of Virus Eradication 5 (December 2019): 4–5. http://dx.doi.org/10.1016/s2055-6640(20)30080-7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
21

Benton, E. V., and Robert G. Richmond. "Applications of nuclear track detectors in space radiation dosimetry." International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements 12, no. 1-6 (January 1986): 505–8. http://dx.doi.org/10.1016/1359-0189(86)90639-4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
22

Bhanot, Gyan. "How to track renormalization group flows in parameter space." Physics Letters B 154, no. 1 (April 1985): 63–68. http://dx.doi.org/10.1016/0370-2693(85)91568-0.

Full text
APA, Harvard, Vancouver, ISO, and other styles
23

Kashkarov, L., and Yu Bazhutov. "Individual and grouping track pits etched in the exposed in a free space plastic track detectors." Journal of Physics: Conference Series 409 (February 1, 2013): 012048. http://dx.doi.org/10.1088/1742-6596/409/1/012048.

Full text
APA, Harvard, Vancouver, ISO, and other styles
24

Li, Ai Wu. "Research on Space Usage Tracking Principles of Data Pages in SQL Server." Applied Mechanics and Materials 556-562 (May 2014): 5231–34. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.5231.

Full text
Abstract:
As an enterprise database product, SQL Server must track space usage status of all data pages in data files. SQL Server uses PFS page to track information of space usage in data pages. This paper discusses the principles of data page space tracking. Performed add, delete, modify, etc. series of experiments, results shown that the PFS data changes corresponding to different data operations.
APA, Harvard, Vancouver, ISO, and other styles
25

Mieloszyk, Eligiusz, Anita Milewska, and Sławomir Grulkowski. "Capacity analysis of the selected track system in partially ordered space." MATEC Web of Conferences 262 (2019): 11006. http://dx.doi.org/10.1051/matecconf/201926211006.

Full text
Abstract:
A proper location of the interval sections has significant impact on the traffic flow in the railway track network. This issue is critical during line modernization as well as when a new solution accounting for the traffic forecast at particular element of the railway track network is developed . However, the situation is more complex and more expensive for railway stations since improvement of the capacity requires critical organizational changes and additional investments. We have applied partially ordered linear spaces to study the capacity of a track system.
APA, Harvard, Vancouver, ISO, and other styles
26

Zhang, Yong Quan, Gui Ying Lu, and Xiao Ming Wu. "A Simplified Model of Inertial Navigation System for Underground Pipeline Track Instrument." Advanced Materials Research 542-543 (June 2012): 895–900. http://dx.doi.org/10.4028/www.scientific.net/amr.542-543.895.

Full text
Abstract:
Based on the analysis of the basic principle of traditional inertial navigation technology, this paper puts forward a kind of simplified model of the track measurement which applies to underground pipeline. The model using structures of half-strap-down stable platform that composes of a single axis gyro, two accelerometers and pulse taximeter, by measuring angular velocity of pipeline azimuth, pitching angle, platform rolling angle and pipeline length, combined with self-actuated research space track, work out the mathematics model, eventually work out the space track of the underground pipeline. The experiment proves that the underground pipeline track measurement instrument which is designed based on the simplified model, can meet the accuracy requirement of the no-dig project on track measurement, and the equipment’s operation is stable and reliable.
APA, Harvard, Vancouver, ISO, and other styles
27

Chen, Guanzhi, and Yuhan Chen. "A Fast Route Conflict Detection Method based on Space Box." Frontiers in Science and Engineering 2, no. 7 (August 3, 2022): 1–7. http://dx.doi.org/10.54691/fse.v2i7.1399.

Full text
Abstract:
Routes Conflict detection is of great importance to air traffic control. Due to previous route conflict detection algorithm has a large number of computations, high time complexity and low reliability. This paper proposes a fast route conflict detection method based on the space box. Firstly, the space to be detected is divided into several space boxes, and the space box numbers of the track in the airspace are calculated according to the track coordinates. Secondly, in the case that multiple batches of tracks exist in the same space box, the location of the tracks is predicted according to the current track parameters. If the distance between the tracks gradually decreases, it is judged that the tracks have conflict risk and an alarm is required. The simulation results show that the algorithm has low time complexity, and high efficiency, and is suitable for parallel processing and large-scale route conflict detection, which has high application value.
APA, Harvard, Vancouver, ISO, and other styles
28

Niu, Liubin, Jinzhao Liu, and Yunlai Zhou. "Track Irregularity Assessment in High-Speed Rail by Incorporating Carriage-Body Acceleration with Transfer Function." Mathematical Problems in Engineering 2020 (June 27, 2020): 1–16. http://dx.doi.org/10.1155/2020/8414531.

Full text
Abstract:
The determination of the precise track irregularity with unfavorable wavelength, which shall induce vehicle’s violent vibration in terms of the vehicle’s speeds, still challenges the researchers. This study proposes a feasible study of assessing the track irregularity by using the transfer function and the measured carriage-body acceleration by combining the ARX model with state space model. The ARX model and state space model are constructed using system identification to obtain the transfer relation between the track irregularity and the carriage-body acceleration, respectively. The model’s parameters are estimated by the measured data from the high-speed China Railway Comprehensive Inspection Train (CRCIT). The correlation value between the predicted and measured carriage-body acceleration shows that both models can effectively represent the transfer characteristics between the track irregularity and the carriage-body acceleration. Furthermore, the models can help assess the proportion of the vibration caused by track irregularity with the specific wavelengths and determine the track irregularity with unfavorable wavelength.
APA, Harvard, Vancouver, ISO, and other styles
29

Tisseron, Serge. "The avatar, therapy's fast track, between potential space and disavowal." Adolescence HS 1, no. 5 (2011): 75. http://dx.doi.org/10.3917/ado.hs01.0075.

Full text
APA, Harvard, Vancouver, ISO, and other styles
30

Tombasco, Jill, and Penina Axelrad. "Along-Track Separation Uncertainty Modeling Given Space-Based Optical Observations." Journal of Guidance, Control, and Dynamics 35, no. 3 (May 2012): 732–39. http://dx.doi.org/10.2514/1.56240.

Full text
APA, Harvard, Vancouver, ISO, and other styles
31

Skidmore, Andrew K., Nathalie Pettorelli, Nicholas C. Coops, Gary N. Geller, Matthew Hansen, Richard Lucas, Caspar A. Mücher, et al. "Environmental science: Agree on biodiversity metrics to track from space." Nature 523, no. 7561 (July 2015): 403–5. http://dx.doi.org/10.1038/523403a.

Full text
APA, Harvard, Vancouver, ISO, and other styles
32

Zhang, Gang, Xibin Cao, and Daniele Mortari. "Analytical approximate solutions to ground track adjustment for responsive space." IEEE Transactions on Aerospace and Electronic Systems 52, no. 3 (June 2016): 1366–83. http://dx.doi.org/10.1109/taes.2016.140644.

Full text
APA, Harvard, Vancouver, ISO, and other styles
33

Schmidt, Marten Ole. "Space-point calibration of the ALICE TPC with track residuals." EPJ Web of Conferences 245 (2020): 01003. http://dx.doi.org/10.1051/epjconf/202024501003.

Full text
Abstract:
In the LHC Run 3, starting in 2021, the upgraded Time Projection Chamber (TPC) of the ALICE experiment will record minimum bias Pb–Pb collisions in a continuous readout mode at an interaction rate up to 50 kHz. This corresponds to typically 4-5 overlapping collisions during the electron drift time in the detector. Despite careful tuning of the new quadruple GEM-based readout chambers, which fulfill the design requirement of an ion backflow below 1%, these conditions will lead to space-charge distortions of several centimeters that fluctuate in time. They will be corrected via a calibration procedure that uses the information of the Inner Tracking System (ITS), which is located inside, and the Transition Radiation Detector (TRD) and Time-Of-Flight system (TOF), located around the TPC, respectively. By using such a procedure the intrinsic track resolution of the TPC of a few hundred micrometers can be restored. The required online tracking algorithm for the TRD, which is based on a Kalman filter, is presented. The procedure matches extrapolated ITS-TPC tracks to TRD space-points utilizing GPUs. Subsequently these global tracks are refitted neglecting the TPC information. The residuals of the TPC clusters to the interpolation of the refitted tracks are used to create a map of spacecharge distortions. Regular updates of the map compensate for changes in the TPC conditions. The map is applied in the final reconstruction of the data. First performance results of the tracking algorithm will be shown.
APA, Harvard, Vancouver, ISO, and other styles
34

Pugno, Nicola, Michael Schwarzbart, Alois Steindl, and Hans Troger. "On the stability of the track of the space elevator." Acta Astronautica 64, no. 5-6 (March 2009): 524–37. http://dx.doi.org/10.1016/j.actaastro.2008.10.005.

Full text
APA, Harvard, Vancouver, ISO, and other styles
35

Cucinotta, F. A., J. W. Wilson, R. Katz, W. Atwell, G. D. Badhwar, and M. R. Shavers. "Track structure and radiation transport model for space radiobiology studies." Advances in Space Research 18, no. 12 (January 1996): 183–94. http://dx.doi.org/10.1016/0273-1177(96)00039-7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
36

Dani, Adinda Rafika. "IDENTIFIKASI KELAYAKAN RUANG SEMPADAN REL DI MEJING DAN SEDAYU, YOGYAKARTA SEBAGAI RUANG PUBLIK." ATRIUM: Jurnal Arsitektur 6, no. 2 (November 11, 2020): 117–30. http://dx.doi.org/10.21460/atrium.v6i2.120.

Full text
Abstract:
Title: Feasibility Identification of the Railway Track Setback in Mejing and Sedayu, Yogyakarta for a Public Space The availability of public space in an urban area/city is very important. Apart from functioning as regional landmarks, open spaces also function as areas for community interaction. This study aims to identify the feasibility of the lost space area along the railroad boundaries in Mejing and Sedayu as a public space. The research method used is to conduct surveys and interviews with people who use these two railway track border spaces. The survey variables used are comfort, relaxation, passive engagement, active engagement and discovery. The results of the study found that the public space on the Mejing railway track border, from the point of view of comfort, received a poor rating with a percentage of 47.62%, while in Sedayu it received almost the same rating, which was not good with a percentage of 43.14%. When viewed from the relaxation indicator, the open space on the border of Mejing and Sedayu rails received a good rating with a percentage of 52.53% and 52.67%. Meanwhile, the level of open space security at the Mejing railway track border stated that the assessment was good with an average percentage of 53.17% and at the Sedayu rail border received a poor rating with a percentage value of 42.17%. The factor of the low feasibility of open space at the railroad border is a lack of facilities, cleanliness, parking management and the comfort of open space users.
APA, Harvard, Vancouver, ISO, and other styles
37

Zhang, Rui Hua, Yin Fa Zhu, and Song Yang. "To Solve Mechanical Working Space by Applying Graphic Integration in ADAMS." Advanced Materials Research 605-607 (December 2012): 587–91. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.587.

Full text
Abstract:
This paper mainly focuses on applying graphical method to figure out the working space of the new five joint folding arm supported pumper based on ADAMS. Firstly, discrete the included angle α between the third and the forth arm support, pick out several special points, work out the changing curve of the included angle β in the region of [0,180°] between the forth and the fifth arm support, and then get the plane track of the motion of spray gun by superposition of those curves and finally take the effect of turn angles of rotary tables into consideration, figure out the three-dimensional working space track of the spray gun by the superposition of plane track curves in the region of [0,360°].
APA, Harvard, Vancouver, ISO, and other styles
38

Le, Jian, Hua Zhang, and Jin-wen Li. "Space curved fillet weld joints tracking by robots based on rotational arc sensors in gas metal arc welding." Industrial Robot: An International Journal 43, no. 6 (October 17, 2016): 636–46. http://dx.doi.org/10.1108/ir-04-2016-0120.

Full text
Abstract:
Purpose This study aims to improve the welding quality and efficiency, and an algorithm should be designed to realize tracking space-curved fillet weld joints. Design/methodology/approach Fillet weld joints tracking based on the two wheels and the horizontal slider coordinated movement has been studied. The method of pattern recognition is used to identify the height deviation, and the analysis of the accuracy corresponding to recognizing height deviations has been researched. The proportional control algorithm is used to control the vertical and horizontal sliders movement, so fillet weld joints tracking in the height direction has been achieved. Based on wheels and vertical and horizontal sliders coordinated movement, the algorithm of space-curved fillet weld joints tracking has been researched. Findings Some experiments have been done, and experimental results show that the welding robot can track space-curved fillet weld joints with high accuracy and good reliability. Research limitations/implications The welding robot can improve the welding quality and efficiency. Practical implications The welding robot can track fillet weld joints in ship panels, and it was shown that the welding robot could track space-curved fillet weld joints with high accuracy and good reliability. Social implications The welding robot has many industrial and social applications. Originality/value There are various forms of fillet weld joints in the industry, and the fillet weld is curved in the space. Experimental results show that the welding robot can track space-curved fillet weld joints with good stability and high precision.
APA, Harvard, Vancouver, ISO, and other styles
39

Xu, Lei, Qiang Zhang, Zhiwu Yu, and Zhihui Zhu. "Vehicle–track interaction with consideration of rail irregularities at three-dimensional space." Journal of Vibration and Control 26, no. 15-16 (January 14, 2020): 1228–40. http://dx.doi.org/10.1177/1077546319894816.

Full text
Abstract:
Modelling of vehicle–track interaction has long been a hot and interesting topic. In multibody dynamics based on force-equilibrium methods, Hertzian contact and creep theories have been applied in vehicle–track model constructions. In another aspect, the complementarity-based methods have also been widely used in establishing vehicle–track interaction, but still having drawbacks on characterization of wheel–rail contact geometry/creepage in three-dimensional space. In this study, we draw essences from methodologies of refined wheel–rail coupling models and energy-variational principle, and a model for vehicle–track three-dimensional interactions with inclusion of rail irregularity excitations is newly developed. This model possesses high accuracy compared with Hertzian contact, FastSim, and vehicle–track coupled model in the middle-low frequency domain, and also, the advantages in computational stability are possessed. In this model, the unevenness of rail irregularities at the three-dimensional space is preliminarily considered by taking a hypothesis of normal distribution and accordingly, the wheel–rail three-dimensional constraint equations are presented. Extensively, a series of numerical examples are shown to verify the effectiveness and engineering practicability of this model. Besides, the influence of rail three-dimensional irregularities on the dynamic performance of vehicle–track systems is further explored, which shows when the trochoid of the wheel–rail contact points changes rapidly, the additional inertial effects brought out by rail irregularities might exert great influence on wheel–rail forces.
APA, Harvard, Vancouver, ISO, and other styles
40

Tsunashima, Hitoshi. "Condition Monitoring of Railway Tracks from Car-Body Vibration Using a Machine Learning Technique." Applied Sciences 9, no. 13 (July 5, 2019): 2734. http://dx.doi.org/10.3390/app9132734.

Full text
Abstract:
A track condition monitoring system that uses a compact on-board sensing device has been developed and applied for track condition monitoring of regional railway lines in Japan. Monitoring examples show that the system is effective for regional railway operators. A classifier for track faults has been developed to detect track fault automatically. Simulation studies using SIMPACK and field tests were carried out to detect and isolate the track faults from car-body vibration. The results show that the feature of track faults is extracted from car-body vibration and classified from proposed feature space using machine learning techniques.
APA, Harvard, Vancouver, ISO, and other styles
41

Xiao, Song, Xian Si Tan, and Hong Wang. "Interacting Multiple Mode Tracking Algorithm Based on Modified Coordinate Turn Model." Applied Mechanics and Materials 610 (August 2014): 534–39. http://dx.doi.org/10.4028/www.scientific.net/amm.610.534.

Full text
Abstract:
The continuing success of near space hypersonic aircraft flight test has become a real threat to China's space attack-defense system, In view of the problem that the single model cannot track such target effectively, an interacting multiple model (IMM) tracking algorithm based on modified cornering model (MCT) was proposed. First the characteristics of near space hypersonic target were analyzed, and then the target real-time angular velocity according to the target motion equation was estimated, finally the near space hypersonic target tracking through the IMM was carried out. The Monte Carlo simulation results show that the IMM tracking algorithm can effectively track near space hypersonic target, and the tracking accuracy and stability are superior to single model, it has certain practical significance.
APA, Harvard, Vancouver, ISO, and other styles
42

Hao, Yimeng, Shuo Zhang, Xiaoyu Zheng, and Jinye Qu. "Influence of atmospheric density and area-to-mass errors on orbit prediction accuracy." Journal of Physics: Conference Series 2252, no. 1 (April 1, 2022): 012073. http://dx.doi.org/10.1088/1742-6596/2252/1/012073.

Full text
Abstract:
Abstract Due to the fact that the space is becoming increasingly congested, there is a high requirement for the orbit prediction accuracy of space targets to support collision warning tasks. This is especially true for space debris with high area-to-mass ratio and low orbit altitude. This paper focuses on the along-track position error caused by the atmospheric density error and area-to-mass ratio error for targets with near-circular orbit in the orbit prediction. We derive a semi-analytical expression to describe the along-track position error, and the expression’s validity is evaluated by a goodness-of-fit index compared with the simulated “true” along-track position error. The simulation is based on Encke’s special perturbation method, in which the drag error is treated as a perturbation. The drag error is modeled by the difference between the JB2008 and MISIS density model and the sinusoidal oscillation error model concerning the inexact area-to-mass ratio. Furthermore, targets with various orbit altitudes ranging from 300km to 800km are selected to investigate whether the along-track position error can meet the collision warning requirements.
APA, Harvard, Vancouver, ISO, and other styles
43

Hao, Yimeng, Shuo Zhang, Xiaoyu Zheng, and Jinye Qu. "Influence of atmospheric density and area-to-mass errors on orbit prediction accuracy." Journal of Physics: Conference Series 2252, no. 1 (April 1, 2022): 012073. http://dx.doi.org/10.1088/1742-6596/2252/1/012073.

Full text
Abstract:
Abstract Due to the fact that the space is becoming increasingly congested, there is a high requirement for the orbit prediction accuracy of space targets to support collision warning tasks. This is especially true for space debris with high area-to-mass ratio and low orbit altitude. This paper focuses on the along-track position error caused by the atmospheric density error and area-to-mass ratio error for targets with near-circular orbit in the orbit prediction. We derive a semi-analytical expression to describe the along-track position error, and the expression’s validity is evaluated by a goodness-of-fit index compared with the simulated “true” along-track position error. The simulation is based on Encke’s special perturbation method, in which the drag error is treated as a perturbation. The drag error is modeled by the difference between the JB2008 and MISIS density model and the sinusoidal oscillation error model concerning the inexact area-to-mass ratio. Furthermore, targets with various orbit altitudes ranging from 300km to 800km are selected to investigate whether the along-track position error can meet the collision warning requirements.
APA, Harvard, Vancouver, ISO, and other styles
44

Hao, Yimeng, Shuo Zhang, Xiaoyu Zheng, and Jinye Qu. "Influence of atmospheric density and area-to-mass errors on orbit prediction accuracy." Journal of Physics: Conference Series 2252, no. 1 (April 1, 2022): 012073. http://dx.doi.org/10.1088/1742-6596/2252/1/012073.

Full text
Abstract:
Abstract Due to the fact that the space is becoming increasingly congested, there is a high requirement for the orbit prediction accuracy of space targets to support collision warning tasks. This is especially true for space debris with high area-to-mass ratio and low orbit altitude. This paper focuses on the along-track position error caused by the atmospheric density error and area-to-mass ratio error for targets with near-circular orbit in the orbit prediction. We derive a semi-analytical expression to describe the along-track position error, and the expression’s validity is evaluated by a goodness-of-fit index compared with the simulated “true” along-track position error. The simulation is based on Encke’s special perturbation method, in which the drag error is treated as a perturbation. The drag error is modeled by the difference between the JB2008 and MISIS density model and the sinusoidal oscillation error model concerning the inexact area-to-mass ratio. Furthermore, targets with various orbit altitudes ranging from 300km to 800km are selected to investigate whether the along-track position error can meet the collision warning requirements.
APA, Harvard, Vancouver, ISO, and other styles
45

Pae, Dong Sung, Yoon Suk Jang, Sang Kyoo Park, and Myo Taeg Lim. "Track Compensation Algorithm Using Free Space Information with Occupancy Grid Map." International Journal of Control, Automation and Systems 19, no. 1 (January 2021): 40–53. http://dx.doi.org/10.1007/s12555-020-0085-6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
46

Qiao, Zhichao, Wangsong Wu, Zhaowei Wang, Ling Zhang, and Yuanxiang Zhou. "Space Charge Behavior of Thermally Aged Polyethylene Insulation of Track Cables." Polymers 14, no. 11 (May 26, 2022): 2162. http://dx.doi.org/10.3390/polym14112162.

Full text
Abstract:
The interface of multi-layer insulation is a relatively weak point in the cable system during the long-term high-temperature service. Space charge is prone to continuously accumulate in the interface area, leading to the deterioration of electrical properties and even insulation failure in advance. The knowledge about thermal oxidation of polyethylene (PE) materials at the molecular level is still urgent to explore. Herein, single-layer and double-layer PE insulation, representing the typical insulation structure of frequency-shift pulse voltage track cables, were prepared and thermally aged in the oven for up to 360 h. Thermal, mechanical, electrical, and space charge characterizations were systematically carried out. Thermogravimetric analyzer and oxidation induced temperature (OIT) measurements confirmed that LDPE’s thermal-oxidative aging temperature range was the lowest among the three PE groups in the O2 atmosphere. After 360 h thermal aging, the tensile property of HDPE material kept relatively stable, while the elongation at break of the other two groups was lower than 50%. Unaged HDPE exhibits apparent charge injection and migration, leading to the severe electric field distortion of 20%. Noticeable charge accumulation can be observed at the unaged double-layer sample interface due to the mismatching of DC conductivity, which play a significant role in the aged double-layer samples. This work utilizes precise thermal analysis to provide new information about the resistance ability of thermal oxidation of LDPE, FPE, and HDPE, and its influence on space charge behaviors, which is helpful for the insulation design and evaluation in cable applications.
APA, Harvard, Vancouver, ISO, and other styles
47

Romeiser, R., H. Breit, M. Eineder, H. Runge, P. Flament, Karin de Jong, and J. Vogelzang. "Current measurements by SAR along-track interferometry from a Space Shuttle." IEEE Transactions on Geoscience and Remote Sensing 43, no. 10 (October 2005): 2315–24. http://dx.doi.org/10.1109/tgrs.2005.856116.

Full text
APA, Harvard, Vancouver, ISO, and other styles
48

Chen, Yijun, Qun Zhang, Ying Luo, and Tat Soon Yeo. "Micromotion Feature Extraction of Space Target Based on Track-Before-Detect." Journal of Sensors 2017 (2017): 1–14. http://dx.doi.org/10.1155/2017/8723042.

Full text
Abstract:
The micromotion feature of space target provides an effective approach for target recognition. The existing micromotion feature extraction is implemented after target detection and tracking; thus the radar resources need to be allocated for target detection, tracking, and feature extraction, successively. If the feature extraction can be implemented by utilizing the target detecting and tracking pulses, the radar efficiency can be improved. In this paper, by establishing a feedback loop between micromotion feature extraction and track-before-detect (TBD) of target, a novel feature extraction method for space target is proposed. The TBD technology is utilized to obtain the range-slow-time curves of target scatterers. Then, micromotion feature parameters are estimated from the acquired curve information. In return, the state transition set of TBD is updated adaptively according to these extracted feature parameters. As a result, the micromotion feature parameters of space target can be extracted concurrently with implementing the target detecting and tracking. Simulation results show the effectiveness of the proposed method.
APA, Harvard, Vancouver, ISO, and other styles
49

Shi, Zhen, Chang'an Wei, Junbao Li, Ping Fu, and Shouda Jiang. "Parallel search strategy in kernel feature space to track FLIR target." Neurocomputing 214 (November 2016): 671–83. http://dx.doi.org/10.1016/j.neucom.2016.06.052.

Full text
APA, Harvard, Vancouver, ISO, and other styles
50

Marks, Paul. "Race is on to create global network to track space junk." New Scientist 203, no. 2718 (July 2009): 22. http://dx.doi.org/10.1016/s0262-4079(09)61954-0.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the bibliographies on the topic 'Space-track' for other source types:
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