Responsible Center: NASA JSC
Grant Monitor: Williams, Thomas
Center Contact: 281-483-8773
Solicitation: Directed Research
Grant/Contract No.: Directed Research
Project Type: GROUND
No. of Post Docs: 0
No. of PhD Candidates: 0
No. of Master's Candidates: 0
No. of Bachelor's Candidates: 0
No. of PhD Degrees: 0
No. of Master's Degrees: 0
No. of Bachelor's Degrees: 0
|Human Research Program Elements:
(1) HFBP:Human Factors & Behavioral Performance (IRP Rev H)
|Human Research Program Risks:
(1) Occupant Protection:Risk of Injury from Dynamic Loads (Risk move from HHC to SHFH per IRP Rev F)
|Human Research Program Gaps:
(1) OP-02:We do not know how load dynamics and sex differences affect injury risk in spaceflight conditions and do not have adequate injury assessment reference values (IARVs) to mitigate the increased risk of injury to the crew. (Previous title: OP3) (IRP Rev H)
|Flight Assignment/Project Notes:
|| NOTE: End date changed to 9/30/2020 per B. Gore/ARC HRP (Ed., 10/1/19)
NOTE: End date changed to 9/30/2019 per E. Connell/HFBP/JSC (Ed., 11/17/17)
NOTE: Element change to Human Factors & Behavioral Performance; previously Space Human Factors & Habitability (Ed., 1/19/17)
NOTE: Change to start date per E. Connell/SHFH/HRP (Ed., 2/3/16)
NOTE: Added "Development" to title, per E. Connell/SHFH/HRP (Ed., 10/7/15)
NOTE: Change in title to "ATD Injury Metric" from "THOR Injury Metric Development" per E. Connell/SHFH HRP (Ed., 8/19/15)
NOTE: Period of performance changed to 5/1/2015-9/30/2017 (previously 7/3/2014-10/31/2016) due to delayted start, per E. Connell/JSC SHFH element (Ed., 4/15/2015)
|| Data from the Hybrid III and THOR (Test Device for Human Occupant Restraint), anthropomorphic test devices (ATD) currently available to test the Occupant Protection requirements, are not well correlated to low-injury risk, as these ATDs were designed for automotive use. Automotive research is directed at preventing severe injuries in very low probability events. NASA vehicles require a lower risk of injury because the vehicles will land every time, making that a high probability event. The objective of this study is to develop injury risk functions for the Hybrid III and THOR ATDs. Matched pair tests between postmortem human surrogates (PMHS) and each ATD will be used to determine ATD-specific injury criteria. The merit of the matched pair design is the one-to-one correspondence of the results from external loads to both surrogates. Injury outcomes from PMHS tests will be used with region-specific data, such as forces and moments either individually or in combination, to derive ATD-specific injury criteria.
1. Identify appropriate datasets for ATD comparison
2. Test Hybrid III 50th percentile male and THOR in same conditions as historical testing
3. Use historical human data to establish tolerance and injury risk focusing on lateral responses and sex differences
4. Use Bayesian analysis combined with survival analysis along with human tolerance to estimate injury risk. Use results of prior data mining and existing literature as prior distribution
5. Develop new Injury Assessment Reference Values (IARVs) based on the new statistical analysis.
Historical human data will be selected from the Medical College of Wisconsin (MCW) database. The data will be selected based on loading dynamics and subject demographics. Once these data are selected, the Hybrid III 50th percentile male and THOR ATDs will be tested in identical conditions. A Bayesian analysis along with survival analysis will be used to relate the resulting ATD responses to improve injury risk predictions. The results of the Occupant Protection (OP) Data Mining and Modeling Task will be used as prior distributions.
|Rationale for HRP Directed Research:
|| This task meets the criteria for a Directed Task due to schedule constraints and the requirement of using the same test facilities used in the original human testing. Based on the approved Path to Risk Reduction, this task is required to be completed by the end of FY17 in order to meet the Orion schedule for EM-2. Because of this accelerated schedule, there is insufficient time to solicit this work. In addition, the testing in this task must be conducted to best replicate the original human test conditions. Because of this, testing will need to be conducted at the original test facility, excluding the ability to solicit the work.
|Research Impact/Earth Benefits:
|| The outcome of this research will be improved Injury Assessment Reference Values (IARVs) for Anthropomorphic Test Devices or crash test dummies. By improving the quality of IARVs at low severity impacts in multiple directions, automotive vehicle designers can create safer cars and trucks and have the tools needed to show that a design is actually safer.