Dynamic Analysis Of A Street Sweeper For The Manufacturer

To identify potential opportunities for early bearing failure, MSI performed experimental modal analysis (EMA) and operational deflection shape (ODS) tests on a prototype unit for the manufacturer.  The results showed locations where increased stiffness would extend bearing life.

• Problem Statement (Challenge)
  • What (type of machine): Street Sweeper
  • Where (State/ Country): Illinois
  • Why (problem/reason): Identify modes that could cause premature bearing failures
• Work Performed
  • Methods: Experimental Modal Analysis (EMA), Condition Monitoring, and Operating Deflection Shape (ODS)
• Results/ Solution
  • Findings: Mode was identified within 15% of 2x engine running speed, represented a significant risk of resonance condition that could result in vibration related bearing reliability issues.
  • Impact: Addition of cladding was recommended to increase the separation margins from the operating speed to values greater than 15%. The proposed modifications provide a practical level of protection relative to vibration related bearing reliability issues.

ODS model created in MEscope.

Animation.