Evaluation apparatus of hub unit and evaluating method of hub unit
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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Abstract
In an evaluation apparatus of a hub unit, a signal processing unit outputs frequency analysis signals which indicate such a result obtained by that an output signal of an acceleration sensor fixed on a hub unit by a magnet is processed via an A/D converting unit and an envelope detecting unit, and thereafter, the processed sensor signal is analyzed for a frequency analysis by an FFT unit. Then, an evaluation output unit evaluates damage conditions of the hub unit based upon signal strengths of specific frequencies, and overall values, which are acquired from the frequency analysis signals, and then, outputs the evaluated damage condition to a display unit.
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Citations
11 Claims
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1. An evaluation apparatus of a hub unit, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An evaluating method for a hub unit, comprising:
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rotating wheels of a vehicle; fixing an acceleration sensor on a fixing-sided member of the hub unit of said vehicle by utilizing a magnetic force produced by a magnetic force mounting unit of said acceleration sensor; performing an envelope detection and subsequently a frequency analysis with a signal outputted from said acceleration sensor so as to acquire a frequency analysis signal which includes a signal strength of a specific frequency and an overall value; and evaluating a damage condition of said hub unit based upon the signal strength of the specific frequency of said frequency analysis signal and the overall value thereof. - View Dependent Claims (11)
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Specification