What the study found
Soil conditions affect how landing airbags cushion a payload. The study reports that soil can absorb energy during compression, softer soil absorbs more energy, but soil that is too soft can cause the airbag to sink and make landings harder.
Why the authors say this matters
The authors conclude that soil properties should be considered when evaluating landing airbag performance. They state that three indicators—airbag peak pressure, payload maximum acceleration, and maximum drop height—can be used to assess cushioning performance in a more complete way.
What the researchers tested
The researchers built a landing airbag cushioning dynamics model that included soil characteristics, using the control volume method and a crushable foam model. They also validated the airbag cushioning model and the soil impact model experimentally, and then used the model to analyze the influence of soil on cushioning performance.
What worked and what didn't
The model results were reported to be in good agreement with experimental results. The analysis found that soil absorbs energy through compressive deformation, and that softer soil absorbs more energy and makes payload rebound less likely. However, excessively soft soil caused the airbag to sink into the soil, restricted gas venting outward, and led to hard landings.
What to keep in mind
The abstract does not describe detailed limitations beyond the range of the modeled and tested conditions. The reported relationships apply to the soil parameters and cushioning indicators studied here, including soil density, shear modulus, and yield parameters A1 and A2.
Key points
- Soil can absorb energy during the cushioning process through compressive deformation.
- Softer soil absorbs more energy and makes payload rebound less likely.
- Excessively soft soil can cause the airbag to sink and worsen landing performance.
- Soil density, shear modulus, and yield parameters A1 and A2 significantly influence cushioning performance.
- Shear modulus and yield parameter A1 show logarithmic growth relationships with the three cushioning indicators.
- Yield parameter A2 and soil density show linear growth relationships with the three cushioning indicators.
Disclosure
- Research title:
- Soil properties affect landing airbag cushioning performance
- Authors:
- Yuxuan Wang, Xuan Zhou, Jingang Liu, X.J. Li, Jiang Wang, Pei Zhang
- Institutions:
- Xiangtan University
- Publication date:
- 2026-03-12
- OpenAlex record:
- View
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