57 results about "Mass imbalance" patented technology

A method for detecting ice on a wind turbine having a rotor and one or more rotor blades each having blade roots includes monitoring meteorological conditions relating to icing conditions and monitoring one or more physical characteristics of the wind turbine in operation that vary in accordance with at least one of the mass of the one or more rotor blades or a mass imbalance between the rotor blades. The method also includes using the one or more monitored physical characteristics to determine whether a blade mass anomaly exists, determining whether the monitored meteorological conditions are consistent with blade icing; and signaling an icing-related blade mass anomaly when a blade mass anomaly is determined to exist and the monitored meteorological conditions are determined to be consistent with icing.

A symmetrical differential capacitive sensor (60) includes a movable element (66) pivotable about a geometrically centered rotational axis (70). The element (66) includes sections (86, 88). Each of the sections (86, 88) has a stop (94, 96) spaced equally away from the rotational axis (70). Each of the sections (86, 88) also has a different configuration (104, 108) of apertures (102, 106). The configurations (104, 108) of apertures (102, 106) create a mass imbalance between the sections (86, 88) so that the element (66) pivots about the rotational axis (70) in response to acceleration. The apertures (102, 106) also facilitate etch release during manufacturing and reduce air damping when the element (66) rotates. Apertures (126, 128) are formed in electrodes (78, 80) underlying the apertures (102, 106) to match the capacitance between the two sections (86, 88) of movable element (86) to provide the same bi-directional actuation capability.

A method and system for detecting asymmetric utilizing lateral tower acceleration data may include: providing a lateral tower acceleration monitoring system; determining from the lateral tower acceleration monitoring system whether a lateral tower acceleration is above an acceleration limit; determining whether a rotor-mass imbalance condition exists; and determining whether the lateral tower acceleration coincides with icing on a rotor.

The invention discloses a novel method and apparatus to determine the degree of residual mass unbalance and a corrective balance solution for a rotating assembly having a non-vertical axis of rotation. When the center of mass of the rotating assembly is not concentric with the axis of rotation, the condition of unbalance exists. When the rotating assembly is driven by a motor or drives a generator, fluctuations in power are produced proportional to the degree of unbalance. The method and apparatus to determine the degree of mass imbalance consists of measuring the average instantaneous real power over an interval of time, calculating the Fourier Transform of the demodulated signal, establishing the peak amplitude and phase associated with the angular velocity of the rotating assembly and calculating the amount of unbalance. The method and apparatus to provide for a corrective solution consists of simultaneously acquiring a position reference signal of the rotating assembly with the average instantaneous real power signal, calculating the phase difference between the two acquired signals at the angular velocity of the rotating assembly, calculating the magnitude of the unbalance, and calculating the quantity and location of corrective weight necessary to minimize the unbalance to an acceptable level.

A laying head for forming coils using continuous and substantially rectilinear rolled products such as rods or wire, having vibration damping means integrated in one of two rotor supports (3), preferably the one on the rolled product outlet side. Said means comprise a plurality of coils (6, 6′, 6″) arranged around the rotor (3), rotating about its axis (X), which generate a magnetic field actively controlled by a computer, the resultant force of which is perpendicular to the axis (X) and of a predetermined intensity so as to eliminate the inertial forces generated by the mass imbalances. Alternatively, the damping means incorporated in one of the supports are comprised of oil film bearings.

A method and system for detecting asymmetric utilizing longitudinal tower acceleration data may include: providing a rotorspeed acceleration monitoring system; determining from the rotorspeed acceleration monitoring system whether a rotorspeed acceleration is above a rotorspeed acceleration limit; determining whether a rotor-mass imbalance condition exists; and determining whether a longitudinal tower acceleration coincides with icing on a rotor.

The present disclosure is directed to a method for detecting a mass imbalance in a rotor of a wind turbine. The method includes receiving, with a computing device, sensor data indicative of an operating characteristic of the wind turbine. The method also includes determining, with the computing device, a mean amplitude of a designated frequency component of the operating characteristic. Furthermore, the method includes determining, with the computing device, when a mass imbalance is present within the rotor based on the mean amplitude of the designated frequency component.

The present invention relates to a method of correcting rotor imbalance and a wind turbine thereof. The correction method comprises measuring the vibrations within at least one time window and determining an imbalance factor and an imbalance phase. The values of the parameters in the equation for calculating the correction action are then updated based on the imbalance factor and an imbalance phase. A correction angle for each of the wind turbine blades is calculated using these adjusted parameters. The correction angle is used to aerodynamically balance the rotor, and a model may be used to determine the initial values of the parameters. Another imbalance factor and imbalance phase is determined based on another set of measurements. This imbalance factor is then used to calculate a mass moment for correcting the mass imbalance in the wind turbine blades. The weight and location of a balancing mass is finally calculated based on this mass moment and installed in the respective wind turbine blades.

The invention discloses a real-time diagnosis method for the unbalanced fault of the original mass of the rotor at the operating speed of the steam turbine generator set, which belongs to the field of fault diagnosis. By collecting the vibration signal of the rotor shaft of the steam turbine unit, the necessary calculation, analysis and judgment are carried out on the vibration data, the real-time calculation and storage of the power frequency vibration amplitude and phase value of the shaft relative vibration on both sides of the rotor, and the real-time verification of the shaft vibration power frequency vibration amplitude, Judging whether the amplitude of the shaft vibration and power frequency vibration on any side of the rotor is greater than the vibration amplitude threshold; combined with the least square method, the shaft vibration and power frequency vibration data are verified for the stability of the shaft vibration power frequency vibration amplitude trend at the working speed and the operating speed Real-time quantitative calculation and analysis such as the verification of the phase stability of the power frequency vibration phase trend of the lower shaft vibration. Combined with various verification results, automatic real-time online diagnosis of whether the rotor original mass imbalance fault occurs at the working speed of the unit. The invention has the advantages of scientific method, reliable conclusion, automatic real-time on-line monitoring, fault diagnosis and the like.

The invention discloses a method and system for suppressing vibration harmonics of a magnetic levitation rotor with multiple traps connected in parallel. The signal extraction point of the device is placed at the input end of the magnetic levitation controller, and the signal insertion point of the parallel phase shift notch filter is placed at the displacement error signal. The invention is aimed at the magnetic levitation rotor, considering the influence of rotor mass imbalance and sensor vibration, and establishing a harmonic The magnetic levitation rotor dynamics model of wave disturbance effectively suppresses the different frequency disturbance components of the harmonic current at the variable speed frequency by connecting multiple traps with different phase shifts in parallel, thereby effectively suppressing the harmonic vibration and ensuring the closed-loop stability of the system at the same time. And it has reference significance to the harmonic suppression problem under the condition of variable speed of the magnetic levitation-rotor system.