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Related Experiment Videos

Method to quantify ride comfort and allowable accelerations.

P R Payne

    Aviation, Space, and Environmental Medicine
    |January 1, 1978
    PubMed
    Summary
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    Root Mean Square (RMS) acceleration is inadequate for assessing vehicle ride quality during shocks or random vibrations. A new biodynamic modeling method offers automated, quantitative ride quality assessment for improved crew safety and comfort.

    Area of Science:

    • Human-system interaction
    • Biomechanics
    • Vehicle dynamics

    Background:

    • Current Root Mean Square (RMS) acceleration methods for ride quality assessment are insufficient for impulsive or random vibrations.
    • Existing methods can misrepresent severe accelerations as safe and vice versa, posing risks to crew comfort and injury.
    • RMS acceleration lacks relevance for nonsinusoidal vibrations, limiting its applicability in real-world scenarios.

    Purpose of the Study:

    • To develop a novel method for assessing vehicle ride quality that overcomes the limitations of RMS acceleration.
    • To provide a quantitative and automated approach to ride quality evaluation, removing subjective judgments.
    • To enhance the safety and comfort of vehicle occupants, particularly Navy crews exposed to high-speed ship motions.

    Main Methods:

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    • Utilized established biodynamic modeling techniques to analyze vehicle motion.
    • Extended Allen's "shock tolerance" concept to quantify ride quality.
    • Developed an automated system for ride quality assessment, applicable to various vehicle types.

    Main Results:

    • The proposed method accurately assesses ride quality, even during shock or random vibration events.
    • The automated system provides a quantitative basis for comparing the ride quality of different vehicles.
    • Demonstrated the method's effectiveness in the context of Navy crew tolerance to high-speed ship motions.

    Conclusions:

    • The novel biodynamic modeling approach offers a more reliable and objective measure of ride quality than traditional RMS acceleration.
    • This method enhances crew safety by providing accurate assessments of motion-induced risks.
    • Recommendations are made for scaling the criteria for broader population applicability beyond naval applications.