Method and a system for the purpose of condition monitoring of gearboxes
First Claim
1. A system comprising:
- at least one gearbox;
at least one vibration sensor for measuring mechanical vibrations from at least one measuring point of at least one gearbox;
processing equipment configured to receive data from the at least one vibration sensor that contains information of at least one spectrum of mechanical vibrations measured from the at least one measuring point of the at least one gearbox, anda memory configured to store data indicative of at least two pre-determined phenomenon-specific frequencies and reference values of amplitudes relating to the pre-determined phenomenon-specific frequencies,wherein;
the processing equipment is configured to calculate one or more of the reference values of amplitudes relating to the phenomenon-specific frequencies by comparing i) a power indicator that is indicative to the mechanical power transferred with the gearbox and ii) pre-stored data that defines the reference values of amplitudes as functions of the power indicator,the processing equipment is configured to search, from the spectrum of mechanical vibrations, at least two spikes on frequencies determined based on the at least two pre-determined phenomenon-specific frequencies which correspond to a phenomenon defined with at least two phenomenon-specific frequencies and with reference values of amplitudes relating to these phenomenon-specific frequencies,the processing equipment is configured to form an indicator of probability of occurrence for the phenomenon by comparing a) amplitudes of each of the at least two searched spikes and b) the reference values of the amplitudes relating to the phenomenon-specific frequencies, at least two of the reference values of the amplitudes being unequal to each other,the processing equipment is configured to estimate the residual life of the gearbox or choose a plan of maintenance based on the indicator, andwherein the phenomenon is one of a static unbalance, a dynamic unbalance, an angular alignment error, a radial alignment error, a fault in the outer roller path of a bearing, a fault in the inner roller path of a bearing, a fault in the roller element of a bearing, a fault in the holder of roller elements of a bearing, a mechanical resonance, a fault in teeth of a gearwheel, and a loose fit.
1 Assignment
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Accused Products
Abstract
A system for the purpose of condition monitoring of gearboxes includes processing equipment that is configured to receive data that contains information of a spectrum of mechanical vibrations measured from a gearbox being monitored. The processing equipment is configured to search, from the spectrum of mechanical vibrations, at least two spikes on such frequencies which correspond to a phenomenon such as for example a bearing fault. The phenomenon is defined with at least two phenomenon-specific frequencies and with reference values of amplitudes relating to these phenomenon-specific frequencies. The processing equipment is configured to form an indicator of probability of occurrence for the phenomenon on the basis of amplitudes of the searched spikes and the reference values of the amplitudes. The fact that the indicator is formed on the basis of amplitudes of two or more spikes which relate to this phenomenon improves the reliability of the indicator.
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Citations
16 Claims
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1. A system comprising:
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at least one gearbox; at least one vibration sensor for measuring mechanical vibrations from at least one measuring point of at least one gearbox; processing equipment configured to receive data from the at least one vibration sensor that contains information of at least one spectrum of mechanical vibrations measured from the at least one measuring point of the at least one gearbox, and a memory configured to store data indicative of at least two pre-determined phenomenon-specific frequencies and reference values of amplitudes relating to the pre-determined phenomenon-specific frequencies, wherein; the processing equipment is configured to calculate one or more of the reference values of amplitudes relating to the phenomenon-specific frequencies by comparing i) a power indicator that is indicative to the mechanical power transferred with the gearbox and ii) pre-stored data that defines the reference values of amplitudes as functions of the power indicator, the processing equipment is configured to search, from the spectrum of mechanical vibrations, at least two spikes on frequencies determined based on the at least two pre-determined phenomenon-specific frequencies which correspond to a phenomenon defined with at least two phenomenon-specific frequencies and with reference values of amplitudes relating to these phenomenon-specific frequencies, the processing equipment is configured to form an indicator of probability of occurrence for the phenomenon by comparing a) amplitudes of each of the at least two searched spikes and b) the reference values of the amplitudes relating to the phenomenon-specific frequencies, at least two of the reference values of the amplitudes being unequal to each other, the processing equipment is configured to estimate the residual life of the gearbox or choose a plan of maintenance based on the indicator, and wherein the phenomenon is one of a static unbalance, a dynamic unbalance, an angular alignment error, a radial alignment error, a fault in the outer roller path of a bearing, a fault in the inner roller path of a bearing, a fault in the roller element of a bearing, a fault in the holder of roller elements of a bearing, a mechanical resonance, a fault in teeth of a gearwheel, and a loose fit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method comprising:
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measuring mechanical vibrations from at least one measuring point of at least one gearbox with at least one vibration sensor; receiving data that contains information of at least one spectrum of mechanical vibrations measured from the at least one measuring point of the at least one gearbox, reading, from memory, data indicative of at least two pre-determined phenomenon-specific frequencies and reference values of amplitudes relating to the pre-determined phenomenon-specific frequencies, calculating one or more of the reference values of amplitudes relating to the phenomenon-specific frequencies by comparing i) a power indicator that is indicative to the mechanical power transferred with the gearbox and ii) pre-stored data that defines the reference values of amplitudes as functions of the power indicator, searching, from the spectrum of mechanical vibrations, at least two spikes on frequencies determined based on the at least two pre-determined phenomenon-specific frequencies which correspond to a phenomenon defined with at least two pre-determined phenomenon-specific frequencies and with reference values of amplitudes relating to these phenomenon-specific frequencies, at least two of the reference values of the amplitudes being unequal to each other, foaming an indicator of probability of occurrence for the phenomenon by comparing a) amplitudes of each of the at least two searched spikes and b) the reference values of the amplitudes relating to the phenomenon-specific frequencies, and estimating the residual life of the gearbox or choosing a plan of maintenance based on the indicator, wherein the phenomenon is one of the following;
a static unbalance, a dynamic unbalance, an angular alignment error, a radial alignment error, a fault in the outer roller path of a bearing, a fault in the inner roller path of a bearing, a fault in the roller element of a bearing, a fault in the holder of roller elements of a bearing, a mechanical resonance, a fault in teeth of a gearwheel, and a loose fit.
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16. A non-transitory computer readable medium encoded with a computer program comprising computer executable instructions for controlling a programmable processor to:
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receive data that contains information of at least one spectrum of mechanical vibrations measured from at least one gearbox by at least one vibration sensor, read, from memory, data indicative of at least two pre-determined phenomenon-specific frequencies and reference values of amplitudes relating to the pre-determined phenomenon-specific frequencies, calculate one or more of the reference values of amplitudes relating to the phenomenon-specific frequencies by comparing i) a power indicator that is indicative to the mechanical power transferred with the gearbox and ii) pre-stored data that defines the reference values of amplitudes as functions of the power indicator, search, from the spectrum of mechanical vibrations, at least two spikes on frequencies determined based on the at least two pre-determined phenomenon-specific frequencies which correspond to a phenomenon defined with at least two pre-determined phenomenon-specific frequencies and with reference values of amplitudes relating to these phenomenon-specific frequencies, at least two of the reference values of the amplitudes being unequal to each other, form an indicator of probability of occurrence for the phenomenon by comparing a) amplitudes of each of the at least two searched spikes and b) the reference values of the amplitudes relating to the phenomenon-specific frequencies, and estimate the residual life of the gearbox or choose a plan of maintenance based on the indicator, wherein the phenomenon is one of the following;
a static unbalance, a dynamic unbalance, an angular alignment error, a radial alignment error, a fault in the outer roller path of a bearing, a fault in the inner roller path of a bearing, a fault in the roller element of a bearing, a fault in the holder of roller elements of a bearing, a mechanical resonance, a fault in teeth of a gearwheel, and a loose fit.
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Specification