The Experts below are selected from a list of 5571 Experts worldwide ranked by ideXlab platform
Stephen W Rouhana - One of the best experts on this subject based on the ideXlab platform.
-
abdominal impact response to Rigid Bar seatbelt and airbag loading
Stapp car crash journal, 2001Co-Authors: Warren N Hardy, Lawrence W. Schneider, Stephen W RouhanaAbstract:The objective of this study was to resolve discrepancies and fill in some of the gaps in the biomechanical impact response of the human abdomen to frontal impact loading. Three types of abdominal loading were described: Rigid-Bar impacts; seatbelt loading; and close-proximity (out-of-position) airbag deployments. This describes how eleven Rigid-Bar free-back tests were performed into the mid and upper abdomens of unembalmed instrumented human cadavers using nominal impact speeds of 6 and 9 m/s. Seven fixed-back Rigid-Bar testes were also conducted in 3, 6, and 9 m/s using one cadaver to examine the effects of body mass, spinal flexion, and repeated testing. It describes how load-penetration corridors were developed and compared to those previously established by other researchers. Six seatbelt tests were conducted using three cadavers and a peak-loading rate of 3 m/s. The seatbelt loading tests were designed to maximize belt/abdomen interaction and were not necessarily representative of real-world crashes. The results were compared to previously obtained data using swine and they were used to establish a new abdominal load-penetration corridor belt loading. Passenger frontal airbags were deployed into the closely positioned abdomen of three unembalmed cadavers. The penetration-time histories were used to guide the development of a repeatable high-speed surrogate airbag-loading device that uses a low-mass cylinder to stimulate the initial breakout phase of close-proximity passenger airbag loading of the abdomen. The device was used to conduct simulated out-of-position airbag tests into three cadaver abdomens. The abdomen response data from these standardized tests were used to develop a load-penetration corridor for abdomen response to out-of-position airbag deployments.
-
abdominal impact response to Rigid Bar seatbelt and airbag loading
Stapp car crash journal, 2001Co-Authors: Warren N Hardy, Lawrence W. Schneider, Stephen W RouhanaAbstract:This study was conducted to resolve discrepancies and fill in gaps in the biomechanical impact response of the human abdomen to frontal impact loading. Three types of abdominal loading were studied: Rigid-Bar impacts, seatbelt loading, and close-proximity (out-of-position) airbag deployments. Eleven Rigid-Bar free-back tests were performed into the mid and upper abdomens of unembalmed instrumented human cadavers using nominal impact speeds of 6 and 9 m/s. Seven fixed-back Rigid-Bar tests were also conducted at 3, 6, and 9 m/s using one cadaver to examine the effects of body mass, spinal flexion, and repeated testing. Load-penetration corridors were developed and compared to those previously established by other researchers. Six seatbelt tests were conducted using three cadavers and a peak-loading rate of 3 m/s. The seatbelt loading tests were designed to maximize belt/abdomen interaction and were not necessarily representative of real-world crashes. The results were compared to data previously obtained by other researchers using swine and were used to establish a new abdominal load-penetration corridor for belt loading. Passenger frontal airbags were deployed into the closely positioned abdomen of three unembalmed cadavers. The penetration-time histories were used to guide the development of a repeatable high-speed surrogate airbag-loading device that uses a low-mass cylinder to simulate the initial breakout phase of close-proximity passenger airbag loading of the abdomen. This device was used to conduct simulated out-of-position airbag tests into three cadaver abdomens. The abdomen response data from these standardized tests were used to develop a load-penetration corridor for abdomen response to out-of-position airbag deployments.
Warren N Hardy - One of the best experts on this subject based on the ideXlab platform.
-
abdominal impact response to Rigid Bar seatbelt and airbag loading
Stapp car crash journal, 2001Co-Authors: Warren N Hardy, Lawrence W. Schneider, Stephen W RouhanaAbstract:The objective of this study was to resolve discrepancies and fill in some of the gaps in the biomechanical impact response of the human abdomen to frontal impact loading. Three types of abdominal loading were described: Rigid-Bar impacts; seatbelt loading; and close-proximity (out-of-position) airbag deployments. This describes how eleven Rigid-Bar free-back tests were performed into the mid and upper abdomens of unembalmed instrumented human cadavers using nominal impact speeds of 6 and 9 m/s. Seven fixed-back Rigid-Bar testes were also conducted in 3, 6, and 9 m/s using one cadaver to examine the effects of body mass, spinal flexion, and repeated testing. It describes how load-penetration corridors were developed and compared to those previously established by other researchers. Six seatbelt tests were conducted using three cadavers and a peak-loading rate of 3 m/s. The seatbelt loading tests were designed to maximize belt/abdomen interaction and were not necessarily representative of real-world crashes. The results were compared to previously obtained data using swine and they were used to establish a new abdominal load-penetration corridor belt loading. Passenger frontal airbags were deployed into the closely positioned abdomen of three unembalmed cadavers. The penetration-time histories were used to guide the development of a repeatable high-speed surrogate airbag-loading device that uses a low-mass cylinder to stimulate the initial breakout phase of close-proximity passenger airbag loading of the abdomen. The device was used to conduct simulated out-of-position airbag tests into three cadaver abdomens. The abdomen response data from these standardized tests were used to develop a load-penetration corridor for abdomen response to out-of-position airbag deployments.
-
abdominal impact response to Rigid Bar seatbelt and airbag loading
Stapp car crash journal, 2001Co-Authors: Warren N Hardy, Lawrence W. Schneider, Stephen W RouhanaAbstract:This study was conducted to resolve discrepancies and fill in gaps in the biomechanical impact response of the human abdomen to frontal impact loading. Three types of abdominal loading were studied: Rigid-Bar impacts, seatbelt loading, and close-proximity (out-of-position) airbag deployments. Eleven Rigid-Bar free-back tests were performed into the mid and upper abdomens of unembalmed instrumented human cadavers using nominal impact speeds of 6 and 9 m/s. Seven fixed-back Rigid-Bar tests were also conducted at 3, 6, and 9 m/s using one cadaver to examine the effects of body mass, spinal flexion, and repeated testing. Load-penetration corridors were developed and compared to those previously established by other researchers. Six seatbelt tests were conducted using three cadavers and a peak-loading rate of 3 m/s. The seatbelt loading tests were designed to maximize belt/abdomen interaction and were not necessarily representative of real-world crashes. The results were compared to data previously obtained by other researchers using swine and were used to establish a new abdominal load-penetration corridor for belt loading. Passenger frontal airbags were deployed into the closely positioned abdomen of three unembalmed cadavers. The penetration-time histories were used to guide the development of a repeatable high-speed surrogate airbag-loading device that uses a low-mass cylinder to simulate the initial breakout phase of close-proximity passenger airbag loading of the abdomen. This device was used to conduct simulated out-of-position airbag tests into three cadaver abdomens. The abdomen response data from these standardized tests were used to develop a load-penetration corridor for abdomen response to out-of-position airbag deployments.
Lawrence W. Schneider - One of the best experts on this subject based on the ideXlab platform.
-
abdominal impact response to Rigid Bar seatbelt and airbag loading
Stapp car crash journal, 2001Co-Authors: Warren N Hardy, Lawrence W. Schneider, Stephen W RouhanaAbstract:The objective of this study was to resolve discrepancies and fill in some of the gaps in the biomechanical impact response of the human abdomen to frontal impact loading. Three types of abdominal loading were described: Rigid-Bar impacts; seatbelt loading; and close-proximity (out-of-position) airbag deployments. This describes how eleven Rigid-Bar free-back tests were performed into the mid and upper abdomens of unembalmed instrumented human cadavers using nominal impact speeds of 6 and 9 m/s. Seven fixed-back Rigid-Bar testes were also conducted in 3, 6, and 9 m/s using one cadaver to examine the effects of body mass, spinal flexion, and repeated testing. It describes how load-penetration corridors were developed and compared to those previously established by other researchers. Six seatbelt tests were conducted using three cadavers and a peak-loading rate of 3 m/s. The seatbelt loading tests were designed to maximize belt/abdomen interaction and were not necessarily representative of real-world crashes. The results were compared to previously obtained data using swine and they were used to establish a new abdominal load-penetration corridor belt loading. Passenger frontal airbags were deployed into the closely positioned abdomen of three unembalmed cadavers. The penetration-time histories were used to guide the development of a repeatable high-speed surrogate airbag-loading device that uses a low-mass cylinder to stimulate the initial breakout phase of close-proximity passenger airbag loading of the abdomen. The device was used to conduct simulated out-of-position airbag tests into three cadaver abdomens. The abdomen response data from these standardized tests were used to develop a load-penetration corridor for abdomen response to out-of-position airbag deployments.
-
abdominal impact response to Rigid Bar seatbelt and airbag loading
Stapp car crash journal, 2001Co-Authors: Warren N Hardy, Lawrence W. Schneider, Stephen W RouhanaAbstract:This study was conducted to resolve discrepancies and fill in gaps in the biomechanical impact response of the human abdomen to frontal impact loading. Three types of abdominal loading were studied: Rigid-Bar impacts, seatbelt loading, and close-proximity (out-of-position) airbag deployments. Eleven Rigid-Bar free-back tests were performed into the mid and upper abdomens of unembalmed instrumented human cadavers using nominal impact speeds of 6 and 9 m/s. Seven fixed-back Rigid-Bar tests were also conducted at 3, 6, and 9 m/s using one cadaver to examine the effects of body mass, spinal flexion, and repeated testing. Load-penetration corridors were developed and compared to those previously established by other researchers. Six seatbelt tests were conducted using three cadavers and a peak-loading rate of 3 m/s. The seatbelt loading tests were designed to maximize belt/abdomen interaction and were not necessarily representative of real-world crashes. The results were compared to data previously obtained by other researchers using swine and were used to establish a new abdominal load-penetration corridor for belt loading. Passenger frontal airbags were deployed into the closely positioned abdomen of three unembalmed cadavers. The penetration-time histories were used to guide the development of a repeatable high-speed surrogate airbag-loading device that uses a low-mass cylinder to simulate the initial breakout phase of close-proximity passenger airbag loading of the abdomen. This device was used to conduct simulated out-of-position airbag tests into three cadaver abdomens. The abdomen response data from these standardized tests were used to develop a load-penetration corridor for abdomen response to out-of-position airbag deployments.
Pietro Cerveri - One of the best experts on this subject based on the ideXlab platform.
-
are action sport cameras accurate enough for 3d motion analysis a comparison with a commercial motion capture system
Journal of Applied Biomechanics, 2019Co-Authors: Gustavo Ramos Dalla Bernardina, Pietro Cerveri, Tony Monnet, Heber T Pinto, Ricardo Machado Leite De Barros, Amanda Piaia SilvattiAbstract:The aim of this study was to assess the precision and accuracy of an Action Sport Camera (ASC) system (4 GoPro Hero3+ Black) by comparison with a commercial motion capture (MOCAP) system (4 ViconMX40). Both systems were calibrated using the MOCAP protocol and the 3D markers coordinates of a T-shaped tool were reconstructed, concurrently. The 3D precision was evaluated by the differences in the reconstructed position using a Bland-Altman test, while accuracy was assessed by a Rigid Bar test (Wilcoxon rank sum). To examine the accuracy of the ASC in respect to the knee flexion angles, a jump and gait task were also examined using one subject (Wilcoxon rank sum). The ASC system provided a maximum error of 2.47 mm, about 10 times higher than the MOCAP (0.21 mm). The reconstructed knee flexion angles were highly correlated (r2>0.99) and showed no significant differences between systems ( 0.05). As expected, the MOCAP obtained better 3D precision and accuracy. However, we show such differences have little practical effect on reconstructed 3D kinematics.
-
calibrating a video camera pair with a Rigid Bar
Pattern Recognition, 2000Co-Authors: Alberto N Borghese, Pietro CerveriAbstract:Abstract In this paper a new procedure to determine all the geometrical parameters of a stereo-system is presented. It is based on surveying a Rigid Bar carrying two markers on its extremities moved inside the working volume and it does not require grids or complex calibration structures. The external parameters are estimated through the epipolar geometry up to a scale factor which is determined from the true length of the Bar. The focal lengths are determined using the properties of the absolute conic in the projective space. The principal points are computed through a non-linear minimisation carried out through an evolutionary optimisation. The accuracy of the method is assessed on real data and it compares favourably with that obtained through classical approaches based on control points of known 3D coordinates.
Hadi Mohammadi - One of the best experts on this subject based on the ideXlab platform.
-
Rigid Bar loading on pregnant uterus and development of pregnant abdominal response corridor based on finite element biomechanical model
International Journal for Numerical Methods in Biomedical Engineering, 2020Co-Authors: Mostafa Irannejad Parizi, M T Ahmadian, Hadi MohammadiAbstract:During pregnancy, traumas can threaten maternal and fetal health. Various trauma effects on a pregnant uterus are little investigated. In the present study, a finite element model of a uterus along with a fetus, placenta, amniotic fluid, and two most effective ligament sets is developed. This model allows numerical evaluation of various loading on a pregnant uterus. The model geometry is developed based on CT-scan data and validated using anthropometric data. Applying Ogden hyper-elastic theory, material properties of uterine wall and placenta are developed. After simulating the "Rigid-Bar" abdominal loading, the impact force and abdominal penetration are investigated. Findings are compared with the experimental abdominal response corridor, previously developed for a nonpregnant abdomen. "Response corridor" denotes a bounded envelope in response space, within which the system responses usually lie. Results show that at low abdominal penetrations (less than 45 mm), the pregnant abdomen response is highly compatible with the nonpregnant case. While, at large penetrations, the pregnant abdomen demonstrates stiffer behavior. The reason must be the existence of a fetus in the model. This reveals that the existing response corridors would not be reliable to be extended for a pregnant abdomen. Hence, response corridor development for a pregnant abdomen is a crucial task. In this study, a new fixed-back Rigid-Bar loading response corridor is proposed for a pregnant abdomen using the load-penetration behavior of the developed model. This model and response corridor can help to study the pregnant uterus response to environmental loading and investigate the injury risk to the uterus and fetus.
