Project Card 14

Design Study of Seatbelt or Padding Systems for Injury Mitigation

Project Pathway

🟥 Prevention, Design & Systems Thinking

1. Background & Motivation

Seatbelts, padding systems, and energy-absorbing components are among the most effective injury mitigation technologies in transportation, occupational safety, and consumer products. Their protective performance depends not only on material properties, but also on system-level design choices such as load paths, geometry, timing, and interaction with the human body.

In many developing countries, safety systems are often adapted from international designs without sufficient consideration of local vehicle fleets, usage patterns, manufacturing constraints, or injury epidemiology. A biomechanically grounded design study can help bridge this gap by linking injury mechanisms to system-level design decisions.

This project focuses on a conceptual and biomechanical design study of a seatbelt or padding system aimed at mitigating traumatic injury under realistic constraints.

2. Core Biomechanical Question

How can a seatbelt or padding system be designed to mitigate specific injury mechanisms through biomechanically informed system-level design choices?

3. Injury Context and Design Focus

The student must select one design focus, such as:

• Automotive seatbelt system (frontal or rear impact)
• Padding systems for vehicle interiors
• Padding for occupational or industrial environments
• Energy-absorbing systems for sports or public safety

The selected context must be justified based on:

• injury prevalence,
• biomechanical relevance,
• local applicability.

4. Design Approach

This is a systems-level design and analysis project.

The student is expected to:

• Identify dominant injury mechanisms associated with the chosen context
• Translate biomechanical injury mechanisms into design objectives
• Propose and analyze a safety system concept at the system level
• Discuss trade-offs between protection, usability, cost, and manufacturability

This project does not require FEM or experimental testing.

5. Biomechanical Injury Mechanisms (Core Section)

The project must include a biomechanically grounded discussion of:

• Target injury mechanisms (e.g., thoracic compression, abdominal loading, head excursion)
• Load paths between the body and the safety system
• Time-dependent aspects of injury mitigation (e.g., force limiting, energy absorption)

Relevant injury criteria (e.g., chest compression, VC, abdominal force) should be discussed conceptually.

6. System Design Concept

The project should propose a clear system design, including:

a) System Architecture

• Overall layout and components
• Interaction with the human body
• Integration into existing environments (e.g., vehicle interior)

b) Functional Mechanisms

• Energy absorption strategies
• Load distribution or redirection
• Timing and rate effects

c) Design Variables

• Geometry
• Stiffness or compliance
• Adjustability or adaptability

Conceptual sketches or block diagrams are strongly encouraged.

7. Design Trade-offs and Constraints

The project must explicitly discuss:

• Protection vs comfort
• Performance vs cost
• Manufacturability vs idealized biomechanics
• Applicability to local vehicle fleets or environments

This section distinguishes engineering judgment from idealized design.

8. Evaluation and Validation Strategy

The project must address:

• How the proposed design would be evaluated biomechanically
• Relevant standards or test procedures (conceptual level)
• What injury claims could and could not be made without experimental validation

Students must avoid overstating performance.

9. Feasibility & Resource Awareness

The project must include a realistic feasibility analysis:

• Estimated cost range
• Local manufacturing or implementation considerations
• Maintenance and durability considerations
• Ethical and safety implications

Designs ignoring real-world constraints will be penalized.

10. Expected Outcomes

By the end of the project, the student should deliver:

• A biomechanically justified seatbelt or padding system concept
• Clear explanation of injury mitigation mechanisms
• Design trade-off analysis
• Recommendations for future refinement or testing

The outcome should reflect systems-level biomechanical thinking.

11. Deliverables

1. Final Report (20-25 pages, excluding appendices)
2. Conceptual design sketches or diagrams
3. Injury mechanism and load-path illustrations
4. Oral presentation (15-20 minutes)

Optional appendices:

• Comparative design tables
• Conceptual performance metrics
• References to standards or guidelines

12. Project-Specific Grading Rubric

13. Project Scope Agreement

By choosing this project, the student agrees to:

• Focus on system-level injury mitigation, not component optimization
• Respect real-world constraints and ethical responsibilities
• Clearly distinguish between conceptual design and validated performance

Note:
Effective injury prevention often depends more on intelligent system design than on advanced materials or complex models.