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Evaluation apparatus of hub unit and evaluating method of hub unit

  • US 7,821,950 B2
  • Filed: 07/24/2008
  • Issued: 10/26/2010
  • Est. Priority Date: 07/26/2007
  • Status: Expired due to Fees
First Claim
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1. An evaluation apparatus of a hub unit, comprising:

  • an acceleration sensor which includes a magnetic force mounting unit and a main body of the acceleration sensor fixed on said magnetic force mounting unit, said magnetic force mounting unit being fixed on a fixing-sided-member of the hub unit of a vehicle by utilizing a magnetic force thereof;

    a signal processing unit which includes an envelope detecting unit and a frequency analyzing unit, said envelope detecting unit performing an envelope detection with a signal entered from said acceleration sensor, and said frequency analyzing unit performing a frequency analysis with a signal entered from said envelope detecting unit so as to produce a frequency analysis signal which includes a signal strength of a specific frequency and an overall value; and

    an output unit for outputting said frequency analysis signal, including the signal strength of the specific frequency and the overall value, entered from said signal processing unit.

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