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Dynamic system analysis in a vibrating beam accelerometer

  • US 4,761,743 A
  • Filed: 12/02/1985
  • Issued: 08/02/1988
  • Est. Priority Date: 12/02/1985
  • Status: Expired due to Term
First Claim
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1. Apparatus for analyzing a pair of frequencies which are related to natural frequency as a function of a force applied to a system, said system including means producing a first frequency (f1) and a second frequency (f2) comprising:

  • means for sensing said first frequency (f1) and said second frequency (f2);

    means for squaring said first and second frequencies to produce f12 and f22 respectively;

    means for computing the difference between said squared frequencies (f12 -f22) to approximate ##EQU8## to obtain a measure of the force applied to the system, including means for scaling and biasing (f12 -f22) in accordance with the relationship of [(f12 -f22)/B]+[(-A/B)], where A is said bias, and B is said scale factor;

    said means producing said first and said second frequencies comprising;

    a first mass and a second mass, respectively;

    means for vibrating said masses at said first and said second frequencies; and

    means for orienting said masses such that moving said means for producing said frequencies will cause an increase in one said frequency and a decrease in said other said frequency.

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