Driveshaft NVH Attenuation Project

1
Driveshaft NVH Attenuation Project

• Visteon Penn State University
• Simon Bai Ben Hardisky
• Alex Knipper Jesse Parish

2
Objective

• Investigate and develop effective driveshaft
  dampers that will reduce NVH (Noise, Vibration
  and Harshness) concerns over a frequency range of
  0-2500 Hz.

3
Project Goal

• Reduce the Frequency Response Function (FRF) of
  the driveshaft to below 50 (m/s2/N) for 97.5 of
  the specified range.

4
Method

• Investigate and test numerous materials and
  methods to reduce NVH.
• Perform extensive literature research of current
  methods and alternatives to driveshaft NVH.

5
Materials and Methods

• Newspaper
• Fiberglass Roll
• Shredded Paper
• Noise Killer
• Noise Killer / Fiberglass Roll

• Drill holes in driveshaft
• Coat with tar
• PVC pipe inside
• Noodle Inside

6
(No Transcript)
7
(No Transcript)
8
(No Transcript)
9
(No Transcript)
10
(No Transcript)
11
Results (1)

• Empty Driveshaft FRF peaks as high as 1600
  (m/s2/N with average of 280 (m/s2/N).
• NoiseKiller Peak 280 (m/s2/N) average 88
  (m/s2/N)
• Tar Peak 90 (m/s2/N) average
  47 (m/s2/N)

12
Results (2)

• Noodle Peak 90 (m/s2/N) average 50
  (m/s2/N)
• PVC Peak 58 (m/s2/N) average 28
  (m/s2/N)

13
Conclusion

• PVC inserted into the driveshaft resulted in the
  best readings averaging 28 (m/s2/N) which
  achieves our goal of maintaining FRF peaks to
  under 50 (m/s2/N).

14
Recommendation

• The PVC pipe application produces the best
  results.
• Average 28 m/s2/N
• Approximate cost for materials is under 5
• Does not affect the dynamic balance of the
  driveshaft which is a very important aspect of
  rotating shafts

15

• Any Questions?