Title page for ETD etd-4524171049761291


Type of Document Master's Thesis
Author Venezia, Jr., James J
URN etd-4524171049761291
Title Vibration Modeling and Experimental Analysis of a Locomotive Cab
Degree Master of Science
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Mitchell, Larry D.
West, Robert L. Jr.
Ahmadian, Mehdi Committee Chair
Keywords
  • locomotive cab
  • soft-mounted
  • elastomeric mounts
  • noise-vibration-harshness (NVH)
  • James J. Venezia Jr.
Date of Defense 1997-05-01
Availability unrestricted
Abstract
This study evaluates noise and vibrations in a heavy freight locomotive cab, and

provides several measures for providing more comfort to the crew. A full-scale

production cab and sill structure is used to provide the results. The cab is setup in a

controlled laboratory environment in a manner similar to the installation on a

locomotive. Field measurements are used to emulate actual vibration input to the

cab structure. A 16-channel data acquisition system is used to collect both noise and

vibration data on various parts of the cab structure and inside the cab. Upon

establishing the baseline for laboratory vibration measurements and correlating

them with field data, a design of experiment was conducted to evaluate the vibration

contribution of various parts of the cab. This showed that the cab floor and cab roof

had the largest vibrations. A series of solutions including stiffening the cab floor

and damping the cab roof were investigated. The results showed that although such

solutions reduce localized vibrations, the overall effect on reducing cab interior

noise is minimal. As a more global solution, the cab was isolated from the sill

structure through six elastomeric elements mounted at the base of the cab and at the

crash post. The mounts at the base were selected such that they support the static

weight of the cab, provide a resonance frequency that is below the excitation range,

and offer good lateral and longitudinal stability. Two tube-form elastomeric mounts

were placed between the cab structure and the crash posts which attach to the front

of the sill structure. The test results showed that the soft-mounted cab had

significantly lower noise and vibration than the original cab. The vibration levels

were reduced 10 to 100 times at certain locations and frequency ranges. The overall

noise level was reduced by approximately 6 dBA. In an attempt to provide an

estimate of effectiveness of the mounts with different stiffness values, a simulation

model was prepared in Matlab. Although the model did not yield accurate results, it

resulted in several recommendations for future research work.

Files
  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 
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  appendices.pdf 19.01 Kb 00:00:05 00:00:02 00:00:02 00:00:01 < 00:00:01
  chapter1.pdf 15.96 Kb 00:00:04 00:00:02 00:00:01 < 00:00:01 < 00:00:01
  chapter2.pdf 536.10 Kb 00:02:28 00:01:16 00:01:07 00:00:33 00:00:02
  chapter3.pdf 600.49 Kb 00:02:46 00:01:25 00:01:15 00:00:37 00:00:03
  chapter4.pdf 717.32 Kb 00:03:19 00:01:42 00:01:29 00:00:44 00:00:03
  chapter5.pdf 53.60 Kb 00:00:14 00:00:07 00:00:06 00:00:03 < 00:00:01
  chapter6.pdf 6.01 Kb 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01 < 00:00:01
  etd.pdf 25.43 Kb 00:00:07 00:00:03 00:00:03 00:00:01 < 00:00:01
  references.pdf 13.01 Kb 00:00:03 00:00:01 00:00:01 < 00:00:01 < 00:00:01
  vita.pdf 70.94 Kb 00:00:19 00:00:10 00:00:08 00:00:04 < 00:00:01

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