NASA’s NESC outlines a systematic approach to enhance human factors in Mars mission design, including quantitative methodologies for crew size determinatio
Overview of Human Factors in Mars Mission Design
The NASA Engineering and Safety Center (NESC) has developed a comprehensive approach to enhance the human factors involved in Mars mission design. This approach aims to optimize crew safety, mission success, and resilience in the face of unique challenges such as long communication delays and extended blackout periods.
Quantitative Methodology for Crew Size Determination
The NESC’s methodology provides a systematic, quantitative framework to determine the appropriate crew size for Mars missions. By integrating lessons learned from NASA’s spaceflight programs and applying Department of Defense (DoD) methodologies, the NESC has created a suite of modeling tools to support evidence-based decision-making.
Key Models for Human Performance Analysis
### Mental Workload of IV Operations for Planetary Surface EVAs
The IV Operations for Planetary Surface EVA Model simulates the mental workload of intravehicular (IV) crewmembers during extravehicular activities (EVAs) on Mars. It reveals that the current pacing of EVAs and combined flight controller duties would lead to unacceptably high workload, emphasizing the need for improved task automation or additional IV support.
### Robotic Arm Assisted EVA Operator Model
This model evaluates the mental workload of crewmembers operating a robotic arm during Mars transit missions. It highlights the necessity of a two-person team to manage the workload during manual operations, with stressors like sleep debt significantly impacting performance.
### Mars Transit Crew Model
The Mars Transit Crew Model assesses the staffing requirements for a 9-month transit mission, predicting that more than six crewmembers are needed to handle the increased workload due to unplanned events and the lack of ground control support.
### Personnel, Expertise, and Training Model
This model quantifies the expertise required for crew members to respond to unforeseen failures that could lead to loss of crew or mission (LOC/LOM) consequences. Based on ISS historical data, it predicts a high probability of such events during Mars transit, underscoring the importance of adequate crew complement.
Implications for Mission Design
The NESC’s methodology offers critical insights into the human factors involved in Mars mission design. By addressing the unique challenges of long communication delays and extended blackouts, it supports the development of mission architectures that prioritize crew safety and mission success. Early application of these tools enables concurrent consideration of mission architecture, operational concepts, and crew roles, ensuring a balanced approach to human resilient performance in the future of space exploration.
Crew Response Success and LOC/LOM Consequences
A recent analysis of crew response success rates and their potential Long-Endurance Crew Operations (LOCO) and Long-Endurance Mission (LOME) outcomes revealed that a successful crew response was achieved 90%, 95%, 98%, and 99.985% of the time. This assessment is crucial for determining the likelihood of encountering LOC/LOM consequences on a mission to Mars.
Likelihood of LOC/LOM Consequences
According to the Human System Risk Board's risk matrix, an estimated likelihood of LOC/LOM consequences exceeds 1% for all response success rates except the most conservative 99.985% success rate. At this threshold, the likelihood of LOC/LOM drops below 0.1%, which is categorized as "yellow" on the risk matrix. This finding underscores the critical importance of crew expertise in diagnosing and restoring critical systems during unforeseen mission failures.
Personnel, Expertise, and Training Model
To address these challenges, the Personnel, Expertise, and Training model was developed. This model aims to provide the agency with the capability to evaluate the trade space between different crew sizes and their associated risks. The model accepts various trade-space parameters, which are then used to determine the risk level for a given crew size.
NESC’s Methodology for Crew-Sizing
The National Environmental Space Center (NESC) has proposed a methodology to aid in crew-size determinations. By inputting trade-space parameters into any of the four models, the output characterizes the risk level associated with a specific crew size. This approach ensures that mission planners can make informed decisions regarding crew size, thereby optimizing mission success and crew safety.
This comprehensive analysis and proposed methodology will be instrumental in preparing for the complex challenges of long-duration space missions, ensuring that the crew has the necessary skills and expertise to handle unforeseen failures effectively.
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