Measuring and testing – Vibration – Sensing apparatus
Patent
1986-03-06
1988-11-15
Myracle, Jerry W.
Measuring and testing
Vibration
Sensing apparatus
7386234, 364508, G01M 1302
Patent
active
047839988
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method of monitoring the operation of a cyclically moving, power generating or power transmitting element.
In many different applications, a power generating or power transmitting element is performing a cyclic motion, i.e. a rotational motion or a reciprocating motion. The power generating or power transmitting element may be a motor, an engine, a generator, a gear transmission linkage, a transmission shaft or the like. It is well known in the art to arrange a motion detector, such as an optical detector, a magnetic or mechanical detector at or adjacent to the element in order to render it possible to determine if the element is moving or not and to determine the cyclic frequency of the element, if desired. Common to these motion detector applications is the fact that the motion detection serves the purpose of monitoring the motion of the element or a point thereof, exclusively.
Contrary to the well-known art of monitoring the motion of a cyclically moving element or monitoring the motion of a point thereof, the present invention is based on the realization that the operation of the cyclically moving, power generating or power transmitting element may be monitored by monitoring the motion of at least one point of the element, as the information derived from monitoring the motion of the point of the element inherently contains information regarding the operation of the power generating or power transmitting element.
In accordance with the teachings of the present invention, a method of monitoring the operation of a cyclically moving, power generating or power transmitting element by monitoring the motion of at least one point thereof is provided, the method comprising the following sequence of steps:
(a) providing a first reference signal representing a reference motion of the point of the element during at least one cycle,
(b) storing the first reference signal in a memory means,
(c) providing a time varying measuring signal representing the actual motion of the point of the element during said at least one cycle, and
(d) comparing the first reference signal and the measuring signal, so as to generate an anomalous signal representing an anomalous operation of the element during said at least one cycle, in case the comparison of the first reference signal and the measuring signal results in a divergence exceeding a predetermined limit.
Basically, it is believed that the information derived from monitoring the motion of the point of the element originates from the fact that any power generating or power transmitting element is to some extent elastic and therefore is deformed elastically when exposed to physical stresses such as motion accelerating forces, frictional forces etc.
In the present context, the term "anomaly" expresses that the opeation of the element as determined by comparing the first reference signal and the measuring signal is different from the reference motion of the element as represented by the first reference signal.
In the present context, the term "signal" expresses any analog or digital representation of a single physical event or a plurality or sequence of physical events, such as a single value of a voltage or a current, a sequence or train of voltage or current values, e.g. in numerical representation, etc.
In order to render it possible to continuously monitor the operation of the cyclically moving, power generating or power transmitting element, the steps (c) and (d) may be repeated. Preferably, the steps (c) and (d) are repeated during every cycle of the element. Alternatively, the repetition rate may be determined by an external clock, or the steps (c) and (d) may be repeated during every two or more cycles of the element.
In accordance with the presently preferred embodiment of the method according to the invention, at least one further point of the element is monitored, and the reference signal is a difference signal which further represents a difference between reference motions of points of the element during said at least one cycle, and
REFERENCES:
patent: 3309920 (1967-03-01), Cuthbert
patent: 3484686 (1969-12-01), Wade
patent: 4123935 (1978-11-01), Maringer
patent: 4181024 (1980-01-01), Leak et al.
patent: 4184114 (1980-01-01), Minakuchi
patent: 4228396 (1980-10-01), Palombo et al.
patent: 4295363 (1981-10-01), Buck et al.
patent: 4453407 (1984-06-01), Sato et al.
patent: 4609992 (1986-09-01), Bray
patent: 4612620 (1986-09-01), Davis et al.
patent: 4621524 (1986-11-01), von Thun
"Diesel Engine Health: Laser Diagnostics" by Halliwell et al., published at the International Off-Highway Meeting & Exposition, Sep. 12-15, 1983.
DME - Danish Micro Engineering A/S
Myracle Jerry W.
LandOfFree
Method of monitoring the operation of a cyclically moving, power does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of monitoring the operation of a cyclically moving, power, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of monitoring the operation of a cyclically moving, power will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1096812