Smart modeling of bobsleigh track surface VR

2021 ◽  
Author(s):  
Izumi Ban ◽  
Atsuko Kanematsu ◽  
Takatoshi Naka ◽  
Tsuyoshi Taki ◽  
Masashi Yamada ◽  
...  
Keyword(s):  
Track Surface

BACTERIAL COMMUNITY ANALYSIS AS A METHOD TO TRACK SURFACE WATER PERTURBATION TO GROUNDWATER

2016 ◽  
Author(s):  
Jennifer C. Underwood ◽  
◽  
Ronald W. Harvey ◽  
David W. Metge ◽  
Denis R. LeBlanc
Keyword(s):  
Surface Water ◽  
Bacterial Community ◽  
Community Analysis ◽  
Track Surface

scholarly journals Impact or push-off lameness presentation is not altered by the type of track surface where horses are trotted

2015 ◽  
Vol 67 (6) ◽  
pp. 1475-1482 ◽  
Author(s):  
M.S. Azevedo ◽  
F.D.D.L. Côrte ◽  
K.E. Brass ◽  
M. Gallio ◽  
S.L Dau ◽  
...  
Keyword(s):  
Inertial Sensors ◽  
Concrete Surface ◽  
Variation Coefficient ◽  
Soft Ground ◽  
Loose Sand ◽  
Significance Level ◽  
Tukey Test ◽  
Minimum Height ◽  
Track Surface ◽  
Vector Sum

This study aimed to evaluate the influence of the track surface on which horses are examined, regarding the phase of lameness presentation. Ten horses with lameness in at least one limb were evaluated with wireless inertial sensors on three track surfaces (concrete, loose sand and grass). Six crossover track sequences were established. The variables vector sum, maximum and minimum height of the head and pelvis, variation coefficient of the maximum and minimum height of the head and pelvis were analyzed using ANOVA, followed by Tukey test to compare means between track surface and sequence, at 5% significance level. The lameness phase (impact or pushoff) was analyzed considering the proportion of affected animals. There were no differences on vector sum, maximum and minimum height or variation coefficient of head and pelvis. Difference was observed on the number of strides registered on sand compared to grass and concrete (p <0.0001) for fore and hindlimbs. Impact lameness on forelimbs was presented by a larger number of animals on the concrete surface; pushoff lameness was more evident on the grass surface. In the hindlimbs, impact lameness was more evident on the grass surface, while pushoff lameness was in greater number of animals on concrete surfaces. The track sequence on which horses were trotted during evaluation does not seem to be a factor, but the number of lame horses and the phase of lameness manifestation can vary between track surfaces, as some horses showed impact lameness on soft ground and elevation lameness on hard ground.

Analysis of Dynamic Response of a Railway Locomotive Using ANSYS

2021 ◽  
Vol 13 (2) ◽  
Author(s):  
Srihari Palli ◽  
Raghuveer Dontikurti ◽  
Rakesh Chandmal Sharma ◽  
Neeraj Sharma
Keyword(s):  
Dynamic Response ◽  
Time History ◽  
Time History Analysis ◽  
Surface Irregularity ◽  
Transient Dynamic Analysis ◽  
Element Analysis ◽  
Car Body ◽  
History Analysis ◽  
Track Surface ◽  
General Time

Transient dynamic analysis (sometimes called time-history analysis) is a technique used to determine the dynamic response of a structure under the action of any general time-dependent loads. The time scale of the loading is such that the inertia or damping effects are considered to be important. Present work is focused on performing the time history analysis of a typical locomotive coach using finite element analysis in Indian railroad conditions. Track surface irregularity in the form of an ellipsoidal bump is modelled with assumptions that the vehicle passes over the bump in 0.144 seconds, variation in displacement at different key locations of the truck and car body models is plotted against time under standard loading conditions. The response pattern of the front and rear portions of the locomotive truck and car body indicate that these locations are more susceptible to wheel excitations compared to that of the centre portions of it as they are away from the centre of gravity of the vehicle due to unbalanced mass distribution.

Fatigue-Related Changes in Running Gait Patterns Persist in the Days Following a Marathon Race

2020 ◽  
Vol 29 (7) ◽  
pp. 934-941 ◽  
Author(s):  
Christian A. Clermont ◽  
Andrew J. Pohl ◽  
Reed Ferber
Keyword(s):  
Musculoskeletal Pain ◽  
Center Of Mass ◽  
Vertical Direction ◽  
Measurement Unit ◽  
Post Intervention ◽  
Marathon Runners ◽  
Gait Patterns ◽  
Marathon Race ◽  
Track Surface ◽  
Running Biomechanics

Context: The risk of experiencing an overuse running-related injury can increase with atypical running biomechanics associated with neuromuscular fatigue and/or training errors. While it is important to understand the changes in running biomechanics within a fatigue-inducing run, it may be more clinically relevant to assess gait patterns in the days following a marathon to better evaluate the effects of inadequate recovery on injury. Objective: To use center of mass (CoM) acceleration patterns to investigate changes in running patterns prior to (PRE) and at 2 (POST2) and 7 (POST7) days following a marathon race. Design: Pre–post intervention study. Setting: A 200-m oval track surface. Participants: Seventeen recreational marathon runners (10 females, age = 34.2 [5.67] y; 7 males, age = 47.41 [15.32] y). Intervention: Marathon race. Main Outcome Measures: An inertial measurement unit was placed near the CoM to collect triaxial acceleration data during overground running for PRE, POST2, and POST7 sessions. Twenty-two features were extracted from the acceleration waveforms to characterize different aspects of running gait. Lower-limb musculoskeletal pain was also recorded at each session with a visual analog scale. Results: At POST2, runners reported higher self-reported pain and exhibited elevated peak mediolateral acceleration with an increased mediolateral ratio of acceleration root mean square compared with PRE. At POST7, pain was reduced and more similar to PRE, with runners demonstrating increased stride regularity in the vertical direction and decreased peak resultant acceleration. Conclusions: The observed changes in CoM motion at POST2 may be associated with atypical running biomechanics that can translate to greater mediolateral impulses, potentially increasing the risk of injury. This study demonstrates the use of an accelerometer as an effective tool to detect atypical CoM motion for runners due to fatigue, recovery, and musculoskeletal pain in real-world environments.

Surface ligation stage revealed through polarity-dependent fluorescence during perovskite nanocrystal growth

2020 ◽  
Vol 8 (21) ◽  
pp. 7041-7050 ◽  
Author(s):  
James C. Sadighian ◽  
Michael L. Crawford ◽  
Timothy W. Suder ◽  
Cathy Y. Wong
Keyword(s):  
Nanocrystal Growth ◽  
Track Surface

Selective, polarity-based filtration of a reaction mixture during growth was used to track surface ligation during nanocrystal growth.

Forest Soil Compaction: Effect of Multiple Passes and Loadings on Wheel Track Surface Soil Bulk Density

1988 ◽  
Vol 5 (2) ◽  
pp. 120-123 ◽  
Author(s):  
Stephen G. Shetron ◽  
John A. Sturos ◽  
Eunice Padley ◽  
Carl Trettin
Keyword(s):  
Bulk Density ◽  
Soil Compaction ◽  
Surface Soil ◽  
Soil Bulk Density ◽  
Northern Red Oak ◽  
Wheel Drive ◽  
Density Values ◽  
Track Surface ◽  
Four Wheel Drive ◽  
Wheel Track

Abstract The change in wheel track surface soil bulk densities was determined after a mechanized thinning in a northern red oak stand. Mean bulk density values of the 0 to 5 cm surface of the wheel tracks immediately after felling, bunching, and skidding were: 0.80 g/cc on the high use areas; 0.77 g/cc on the low use areas; and 0.42 g/cc in the undisturbed areas. No significant differences in surface soil bulk densities were found between several loading treatments using a four-wheel drive articulated forwarder. The data indicate that initial passes of the equipment produce most of the disturbance. No significant recovery in wheel track soil bulk densities occurred during the year following harvest regardless of treatment. North. J. Appl. For. 5:120-123, June 1988.

Dairy cow preference for a soft track surface

2002 ◽  
Vol 50 (2) ◽  
pp. 83-83 ◽  
Author(s):  
NG Gregory ◽  
OD Taylor
Keyword(s):  
Dairy Cow ◽  
Track Surface

Track Surface Image Collecting System Base on Area-Array Camera

2013 ◽  
Vol 321-324 ◽  
pp. 1145-1149 ◽  
Author(s):  
Kun Lin Lü ◽  
Jun Zhang ◽  
Guang Yu Dai ◽  
Liang Sun ◽  
Long Guo ◽  
...  
Keyword(s):  
Exposure Time ◽  
Linear Array ◽  
Optical Detection ◽  
Maximum Speed ◽  
Rail Track ◽  
Area Array ◽  
Surface Image ◽  
Track Surface ◽  
Array Camera ◽  
Collecting System

The first step of track surface detection based on contactless optical detection is to obtain the surface image. This paper introduces a vehicle-mounted image collecting system base on area-array camera. This system avoids image morphing and edge deformation of system base on linear-array camera.Camera could works in both frequently flash and persistent bright without influence image collecting and will not miss information of the rail track surface when vehicle keeps the speed of 342Km/h. The exposure time should be chosen according to railcar speed and maximum speed.

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