The Experts below are selected from a list of 34575 Experts worldwide ranked by ideXlab platform
S.d. Layton - One of the best experts on this subject based on the ideXlab platform.
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Validation of design for space Launch Vehicles
1993 Proceedings Real-Time Systems Symposium, 1993Co-Authors: B.j. Jambor, G.w. Eger, S.d. LaytonAbstract:Interactions between fault tolerance and real-time requirements make the design of fault tolerant avionics for Launch Vehicles a challenge due to the necessity to handle time constrained execution of asynchronous events concurrently with potential faults. Results of designed experiments run on a prototype fault tolerant network are described. The shape of the probability density function of different tasks has been measured. Conclusions are drawn about guaranteeing task completion time.
John Garvey - One of the best experts on this subject based on the ideXlab platform.
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Implementation of wireless technologies on Launch Vehicles
2011 4th Annual Caneus Fly by Wireless Workshop, 2011Co-Authors: John Culbertson, Eric Besnard, Gabriel Martin, Ali Abedi, Frederick Schwaner, John GarveyAbstract:Wireless technologies provides unique advantages in their implementation on Launch Vehicles in two major areas, Low Cost Drop-in wireless telemetry systems and Stage to stage wireless communication. Low-Cost Drop-in wireless telemetry systems provide engineers the ability to easily integrate new sensors in the later stages of vehicle development with minimal changes to vehicle configuration. Statge to stage wireless communication systems provide a risk mitigating alternative to traditional break away umbilicals between stages.
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Application of wireless technology to CALVEIN Launch Vehicles
CANEUS Fly by Wireless Workshop 2010, 2010Co-Authors: John Culbertson, Eric Besnard, John GarveyAbstract:The CALVEIN (California Launch Vehicle Education Initiative) program is a partnership between Garvey Spacecraft Corporation (GSC) and California State University Long Beach (CSULB) whose mission is to provide students the opportunity to build, design, and flight test low cost Launch Vehicles for education and technology development purposes. Through this work we have received contracts and teamed up with multiple government agencies, organizations and universities to test new aerospace technologies on our low cost Launch Vehicles. In our position we are able to, and have rapidly tested new wireless aerospace technologies, which we plan to continue in the future as we implement and mature these technologies in the production of our Nano-satellite Launch Vehicle (NLV).
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Application of wireless technology to CALVEIN Launch Vehicles
CANEUS Fly by Wireless Workshop 2010, 2010Co-Authors: John Culbertson, Eric Besnard, John GarveyAbstract:The paper presents the implementation of wireless sensor system to California Launch vehicle education initiative (CALVEIN) program. The CALVEIN program provides student the opportunity to build, design, and flight test low cost Launch Vehicles for education and technology development purposes. This enables the researchers to rapidly test new wireless aerospace technologies, which can be used in the future implementation of the nanosatellite Launch vehicle (NLV).
Elisabeth M Patecornell - One of the best experts on this subject based on the ideXlab platform.
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probability of infancy problems for space Launch Vehicles
Reliability Engineering & System Safety, 2005Co-Authors: Seth D Guikema, Elisabeth M PatecornellAbstract:Abstract This paper addresses the treatment of ‘infancy problems’ in the reliability analysis of space Launch systems. To that effect, we analyze the probability of failure of Launch Vehicles in their first five Launches. We present methods and results based on a combination of Bayesian probability and frequentist statistics designed to estimate the system's reliability before the realization of a large number of Launches. We show that while both approaches are beneficial, the Bayesian method is particularly useful when the experience base is small (i.e. for a new rocket). We define reliability as the probability of success based on a binary failure/no failure event. We conclude that the mean failure rates appear to be higher in the first and second flights (≈1/3 and 1/4, respectively) than in subsequent ones (third, fourth and fifth), and Bayesian methods do suggest that there is indeed some difference in Launch risk over the first five Launches. Yet, based on a classical frequentist analysis, we find that for these first few flights, the differences in the mean failure rates over successive Launches or over successive generations of Vehicles, are not statistically significant (i.e. do not meet a 95% confidence level). This is true because the frequentist analysis is based on a fixed confidence level (here: 95%), whereas the Bayesian one allows more flexibility in the conclusions based on a full probability density distribution of the failure rate and therefore, permits better interpretation of the information contained in a small sample. The approach also gives more insight into the considerable uncertainty in failure rate estimates based on small sample sizes.
B.j. Jambor - One of the best experts on this subject based on the ideXlab platform.
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Validation of design for space Launch Vehicles
1993 Proceedings Real-Time Systems Symposium, 1993Co-Authors: B.j. Jambor, G.w. Eger, S.d. LaytonAbstract:Interactions between fault tolerance and real-time requirements make the design of fault tolerant avionics for Launch Vehicles a challenge due to the necessity to handle time constrained execution of asynchronous events concurrently with potential faults. Results of designed experiments run on a prototype fault tolerant network are described. The shape of the probability density function of different tasks has been measured. Conclusions are drawn about guaranteeing task completion time.
Eric Besnard - One of the best experts on this subject based on the ideXlab platform.
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Wireless network design and analysis for real time control of Launch Vehicles
IEEE International Conference on Wireless for Space and Extreme Environments, 2013Co-Authors: Mojtaba Razfar, Eric Besnard, Joel Castro, Lonnie Labonte, Ramin Rezaei, Fady Ghabrial, Praveen Shankar, Ali AbediAbstract:Network design for real time control of Launch Vehicles need to consider latency and noise in wireless environments. The proposed system will gather the acceleration information received from multiple sensors to reliably and robustly relay the orientation of the rocket back to the actuator system. To do so, a network simulation software will give us an estimate of the efficiency of these sensors in terms of their latency and throughput. Several factors can be considered to analyze the performance of these sensors such as the location of these nodes, device type, and the network parameters associated with the sensor nodes. In this work, we have analyzed these factors using OPNET simulator to have a better understanding of the performance of these sensors.
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Implementation of wireless technologies on Launch Vehicles
2011 4th Annual Caneus Fly by Wireless Workshop, 2011Co-Authors: John Culbertson, Eric Besnard, Gabriel Martin, Ali Abedi, Frederick Schwaner, John GarveyAbstract:Wireless technologies provides unique advantages in their implementation on Launch Vehicles in two major areas, Low Cost Drop-in wireless telemetry systems and Stage to stage wireless communication. Low-Cost Drop-in wireless telemetry systems provide engineers the ability to easily integrate new sensors in the later stages of vehicle development with minimal changes to vehicle configuration. Statge to stage wireless communication systems provide a risk mitigating alternative to traditional break away umbilicals between stages.
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Application of wireless technology to CALVEIN Launch Vehicles
CANEUS Fly by Wireless Workshop 2010, 2010Co-Authors: John Culbertson, Eric Besnard, John GarveyAbstract:The CALVEIN (California Launch Vehicle Education Initiative) program is a partnership between Garvey Spacecraft Corporation (GSC) and California State University Long Beach (CSULB) whose mission is to provide students the opportunity to build, design, and flight test low cost Launch Vehicles for education and technology development purposes. Through this work we have received contracts and teamed up with multiple government agencies, organizations and universities to test new aerospace technologies on our low cost Launch Vehicles. In our position we are able to, and have rapidly tested new wireless aerospace technologies, which we plan to continue in the future as we implement and mature these technologies in the production of our Nano-satellite Launch Vehicle (NLV).
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Application of wireless technology to CALVEIN Launch Vehicles
CANEUS Fly by Wireless Workshop 2010, 2010Co-Authors: John Culbertson, Eric Besnard, John GarveyAbstract:The paper presents the implementation of wireless sensor system to California Launch vehicle education initiative (CALVEIN) program. The CALVEIN program provides student the opportunity to build, design, and flight test low cost Launch Vehicles for education and technology development purposes. This enables the researchers to rapidly test new wireless aerospace technologies, which can be used in the future implementation of the nanosatellite Launch vehicle (NLV).
