The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 10, 2013
Filed:
Jun. 09, 2011
Alain Eberhard, Velaux, FR;
Alain Eberhard, Velaux, FR;
Europcopter, Marignane Cedex, FR;
Abstract
The present invention relates to a method of monitoring the effectiveness of a damper system, wherein the method consists in measuring the relative movements of two strength members, in filtering the measurements in order to isolate those that relate to the lead-lag resonant frequency of the blade, in rectifying the signal, in recording the signal, in comparing the rectified signal (S) with a threshold value (S), in determining an initial time interval (T) as soon as the rectified signal exceeds the threshold value (S), in calculating the integrals of the signal from Tto T+δ and from Tto T+pδ, in calculating the ratio R of the integrals, and in comparing the ratio R with a limit value R, and in activating and delivering an alert signal (V) if the ratio R is greater than or equal to the limit value R.