Strives: String-based Force Feedback for Automotive Engineering

Document Title

STRIVE: String-Based Force Feedback for Automotive Engineering

Document Information

• Subject Area: Force feedback technology in virtual reality, particularly its application in automotive engineering
• Keywords: force feedback, virtual reality, string-driven, participatory design, automotive engineering, ergonomics, system design, technical practice, industrial application, user research

Research Background and Issues

• Problems and Challenges: Although force feedback devices in virtual reality (VR) have demonstrated their potential in interaction through numerous research prototypes, their application in industrial practice remains limited. Especially in the automotive industry, existing devices are often expensive, difficult to set up, or only suitable for specific scenarios, making it challenging to meet the daily needs of engineers.
• Research Importance: Force feedback devices can significantly enhance task efficiency in virtual reality, enabling more realistic assembly validation, reachability checks, and more. This is crucial for improving the accuracy and efficiency of the automotive design process.
• Research Motivation and Related Work: Existing studies are mostly technology-driven rather than application-oriented. A few studies suggest that introducing force feedback in automotive engineering tasks can improve task efficiency, but these studies have not deeply considered the practical needs of automotive engineers or conducted functional evaluations for daily work integration.

Solution

• Research Methods:
  1. Needs Analysis: The authors observed the daily tasks of 13 VR experts in the automotive industry for 10 months, conducted interviews, and analyzed their force feedback requirements.
  2. Design and Innovation: Building on existing devices (e.g., INCA 6D and Wireality), the authors developed a novel string-based force feedback device—STRIVE, characterized by miniaturization, high mobility, low cost (approximately $25 per unit), and broad adaptability.
• Technical Details:
  1. Hardware Design: STRIVE consists of a wireless-controlled small box equipped with a mechanical device featuring cables and electromagnetic brakes, capable of generating a maximum braking force of 180 N quickly and accurately.
  2. Scalability: Through various modules (e.g., straps, clips, or screw-fixed modules), STRIVE can be flexibly mounted on the user's body, tools, or workbench, supporting feedback across multiple body parts.
  3. Software Support: Using the Unity engine to implement force feedback functionality, the system calculates whether force feedback is activated based on user collision points and directions.

Research Outcomes

• Experimental Results:
  1. Performance Evaluation: Testing with 16 VR experts in the automotive industry demonstrated STRIVE's flexibility and applicability in multiple real-world use cases (e.g., reachability checks, head collisions, dual-hand assembly).
  2. User Feedback: Over 85% of experts expressed willingness to integrate STRIVE into their daily work, particularly in complex, confined automotive component operation scenarios.
  3. Perception Improvement: Experiments showed that STRIVE significantly enhanced trust in tasks, the safety of task outcomes, and users' perception of the virtual environment by providing more direct physical feedback.
• Advantages:
  1. Low-cost device, suitable for large-scale adoption.
  2. Lightweight and compact design (device weighs only 110 grams), facilitating mobility and multi-scenario deployment.
  3. Simple setup, typically completed in 2-4 minutes.
• Limitations and Directions:
  1. Noise Optimization: Some users described the mechanical noise during operation as "annoying."
  2. Precision Improvement: Due to the flexible nature of cables and mounting points, the device's precision may decrease during high-speed collisions.
  3. Multi-Degree-of-Freedom Optimization: The current device requires multiple units to provide multi-degree-of-freedom force feedback, potentially increasing usage complexity.
  4. Extended Functions: Users suggested adding weight simulation, surface sliding feedback, and material property feedback (e.g., texture perception).

Research Significance

Through innovative design and practical validation, the authors propose the STRIVE device as a potential solution for force feedback in virtual reality industrial applications, bridging the gap between industrial application and technical research. This study provides valuable insights into the practical extraction of force feedback devices and the optimization of engineers' workflows.

Note: For specific technical parameters or supplementary explanations not covered, please refer to the original paper's appendix, such as detailed hardware setup steps.