2. Vibration Reduction Isolate Add-on for Jackhammers Bad - - PowerPoint PPT Presentation

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2. Vibration Reduction Isolate Add-on for Jackhammers Bad - - PowerPoint PPT Presentation

Feb 20, 2023 380 likes •504 views

2. Vibration Reduction Isolate Add-on for Jackhammers Bad Vibrations 2 Million workers in the US exposed to hand-arm vibration [1] No enforced regulations in the U.S. [2] Jackhammers used for 4-5 Hours per day Hand Arm

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SLIDE 1

Vibration Reduction Add-on for Jackhammers

2.

Isolate

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SLIDE 2

Bad Vibrations

  • 2 Million workers in the US exposed to hand-arm

vibration [1]

  • No enforced regulations in the U.S. [2]
  • Jackhammers used for 4-5 Hours per day

Hand Arm Vibration Syndrome [3]

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SLIDE 3

Existing Solutions

Taking a Break Anti-vibration Gloves Electric Jackhammers with anti- vibration Isolate Effectiveness ✔

×

✔ ✔ Adaptability ✔ ✔ × ✔ Minimal Work Disruption × ✔ × ✔

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SLIDE 4
  • Active vibration

reduction system

  • Price: $400

Isolate

Isolate Add-On Traditional Jackhammer

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SLIDE 5

CUSTOMER NEED PRODUCT ATTRIBUTE ENGINEERING SPECIFICATION

Allow safe use for longer periods Vibration reduction Reduce vibration exposure to below 5 !

"#

Keep current jackhammers Adjustable attachment mechanism End-to-end handle distance between 12 to 24 inches Can be easily stored Height Less than 6 inches Can be easily transported Weight Less than 6 pounds Comfortable to use New handle displacement from old handle Less than 4”

Isolate

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SLIDE 6

Mockup – Passive damping

  • Tested out passive spring

damping solution

  • Saw damping of higher

frequencies rather than the problem frequencies (10 – 50 Hz)

Lower stage motor Passive damping springs Second stage Accelerometer

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SLIDE 7

Mockup – Passive damping

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SLIDE 8

Mockup – Vibration Cancellation

  • Active vibration

cancellation mockup

  • Uses upper-stage motor

to cancel out vibration amplitude

Lower stage motor Upper stage motor

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SLIDE 9

Mockup – Active Damping

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SLIDE 10

Risks

  • Voice-coil active damping/magnetic suspension
  • Compact system
  • Adaptable design
  • User need
  • Functionality on a jackhammer
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SLIDE 11

References

  • [1]St. Michael’s Hospital. Hand-arm Vibration Syndrome,

https://www.ohao.org/PDF/Hand%20Arm%20Vibration%20Syndrome%20March%2 020.pdf(Accessed 10/11/2018)

  • [2] Army Public Health Center. A Guide for Prioritizing Hand-Arm Vibration

Exposure,https://phc.amedd.army.mil/PHC%20Resource%20Library/TG356_Vibrati

  • nPocketGuide.pdf(Accessed 10/15/2018)
  • [3] http://www.altrad-belle.com/?p=health