An analysis of engine humming

Hair wrenching time or not, it helps to know that the web is out there to help solve this problem too. Thanks to voice processing and voice recognition technologies, you can get the actual song by just humming the tune or lyrics. Play on with these three applications and save your grey cells some trouble.

An analysis of engine humming

Said method comprises the following steps: Description description A method for analyzing the ripple inclination of a combustor and method for controlling a gas turbine The invention relates to a method for analyzing the ripple inclination of a combustor and a method for controlling the operation of a gas turbine with a combustion chamber under the proviso that the combustion chamber humming is prevented.

The occurrence of Combustion oscillations is also known as "combustion chamber humming".

An analysis of engine humming

In particular tends the combustor of the gas turbine to hum, when the gas turbine is operated with a high turbine inlet temperature to achieve a high thermal efficiency of the gas turbine. The high turbine inlet temperature can be achieved by a correspondingly high combustion temperature in the combustion chamber, whereby the combustion chamber tends to hum.

By a change in the combustion turnover caused for example by increasing the supply of fuel into the combustion chamber, An analysis of engine humming cause pressure fluctuations, which in turn can lead to a change in the combustion turnover and thus to the formation of a stable pressure oscillation.

The combustion vibrations cause enhanced mechanical and thermal stress of the combustion chamber structure and its suspension. The combustion oscillations can occur suddenly in such intensity that the combustion chamber structure itself or other components of the gas turbine can be damaged.

If such operating states is conventionally relieved, the gas turbine with a high load gradient, which adversely affects the gas turbine output power is reduced.

Remedy operating the gas turbine at a sufficient distance from the border of the self-excited combustion oscillations. For example, due to changing ambient conditions, however, can shift the limit of the self-excited combustion oscillations unfavorable, so that a sufficient distance from the boundary of the self-excited vibrations of combustion must be kept for possible adverse environmental conditions.

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It is disadvantageous that, therefore, the upper power range of the gas turbine must be excluded and can not be driven. The object of the invention is a method for analyzing the ripple inclination of a combustion chamber, a method for controlling an operation of a gas turbine with a combustion chamber and a controller for controlling an operation of a gas turbine to provide the combustion chamber are effectively operated with sufficiently low ripple inclination with the methodThe inventive method for analysis of the ripple inclination of a combustion chamber in an operating state comprises the steps of: This is where the invention comes in: A approach to the burner stability limit can be seen from the fact that the shape of the spectrum of the characteristic changes in specific cases.

Thus, the ratio of the amplitudes of two frequency bands could be used to quantify the ripple inclination example. As long as the amplitude ratio remains constant while increasing the fuel load despite increase in the absolute amplitude valuesthere is no danger.

Check engine light and the engine is making a humming noise.

By quantifying the tendency to hum a tendency can be seen to approach the ripple limit and thus countermeasures can be taken in good time, so that reaching the burner stability limit is avoided with its adverse consequences for the operation.

It is preferred that the stability parameters with the ratio value by dividing the amplitude value of the first resonance and the amplitude value of the second resonance is calculated. With increasing combustion load of the combustor, the frequency positions of the resonances, which can be predetermined experimentally for a present combustion frequency bands in which the resonances during operation of the combustion chamber may occur, for example, dragging.

For easy identification of the resonances these frequency bands can be examined thus in particular so that scanning the entire frequency range of the spectrum does not need to be made.

Preferred dimensions of the stability parameter is formed as the logarithm of the ratio value.

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Further, it is preferable that the stability parameter is attenuated over time with a damping function. Therefore advantageously excessive transient changes in the stability parameter can be contained.

For example, a damping function may be formed such that is formed at a time n of the stability parameters of the arithmetic mean of the ratio value at the time n and the ratio value at the time n It is preferable that the characteristic quantity is simultaneously measured and found the local spectrum for each point at a plurality of locations, the local spectra have an envelope that is used as the spectrum.

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From the formed with the envelope spectrum of the entire spatial inhomogeneities possibly certain of the operating state of the combustion chamber is represented. Thereby, the ripple of inclination of the combustion chamber can be estimated in an operating state advantageous in which the combustion chamber is spatially inhomogeneous applied.

The combustion chamber is preferably formed as an annular combustion chamber rotationally symmetrical about an axis and has a plurality of points at which the characteristics are measured, and the number of measuring points is reduced taking advantage of the symmetry of waveforms.

The inventive method for controlling an operation of a gas turbine with a combustor comprises the steps of: Thus, the stability parameters can be used directly as a control variable for operating the gas turbine.

The instantaneous load of the gas turbine is in direct correlation with the stability parameters, so that with the stability parameters of a power control of the gas turbine with respect to the turning away from the hum of the combustion chamber is bewerkstelligbar.

· GEARBOX MAINTENANCE TIPS GEARBOX MAINTENANCE TIPS Keep Your Gearbox Humming Along. GEARBOX MAINTENANCE TIPS Just like in a car’s engine, oil lubricates the gears and prevents In the process of changing oil, a sample of the old oil can be collected and sent to a lab, where an analysis of particles inside it can reveal potential The humming noise could be the air filter being dirty, the drive belt slipping, or the air conditioning clutch is slipping.

It is safe to drive your vehicle to the appointment as long as there is no smells or loud noises other than the humming noise. Only a shop or a certified technician can give out a warranty for the replacement parts.

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This could be a drive belt or one of the components driven by the drive belt, such as the power steering pump, air conditioning compressor, water pump, or one of the idlers that hold the belt in In order to contrast the AR and FFT methods, point FFT and AR analysis with model order of 21 (p = 21) were applied to a sample humming signal acquired at Hz for 2 s.

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An analysis of engine humming
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