Active cancellation of transformer noise: Field measurements
The paper presents some results from measurements of active noise cancellation on two outdoor transformers. An adaptive signal processor was used to ...
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Applying an active noise barrier on a 110 KV power transformer in
Keywords: Active control, Barrier, Transformer noise ..... Berge T, Pettersen OKO, Sorsdal S. Active cancellation of transformer noise: field measurements.
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Active control of far-field sound radiated by a rectangular panel-A
acoustic control sources, the far-field sound is minimized by alteration of the radiation impedance seen ... into free space, as with a transformer, 4 or transmission into a coupled ...... The radiated sound field was measured using a Bruel and Kjaer 1-in. mi- ..... Berge, O. Kr. O. Petterson, and S. Sorzdal, "Active cancellation of.
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Active noise control - University of Southampton
signal to be cancelled originates from an electroacoustic path, ... of active control. The principle of measuring the sound field with a .... Manually adaptive, feedforward active control system for transformer noise proposed by Conover in 1956.
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applying virtual sound barrier at a room opening for transformer
Jul 16, 2015 ... A virtual sound barrier is applied for active control of noise from 180 MVA transformers in ... Measurement results show that the average noise reduction at the er- ... For transformers in free field, the spherical harmonic expansion of the ..... for active control of transformer noise with on-line cancellation path.
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Active Noise and Vibration Control - Sensor Technology
headsets, transformer qnieting systems, and interior noise reduction in ... In a typieal ANC system operating in a steady harmonic noise field, the noise ... In the feedforward strategy, the noise is measured at the source or prior to reaching ... A second approach to active noise control involves cancellation of the noise at the.
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physical systems for the active control of transformer noise
6.2.1 Measurement of sound field. 116. 6.2.2 Predicted results ... develop a practical active noise cancellation system for transformers. This work, in particular , is ...
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Active noise control in a three-dimensional space - Digital
4.4 Active Noise Cancellation of the (0,1,0) Mode Within a. Rectangular Cavity. 78 ... Figure 2.21: Configuration and the dimensions of the rectangular cavity. 46. Figure 2.22: ... sound field, (b) with active control using two secondary sources. 90. Figure 4.20: .... noise cancellation, including fans [22-23] and transformers [24 ].
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Noisy Transformers & The Flux Offset Controller
◇PG&E measurements confirmed that. Bank#3 ... Sound Pressure Harmonics with and without DC Current. 134 MVA Single Phase Transformer (B core rated AC = 1,73 T). 25,0 ... Field testing found low-level dc ... 3) Active noise cancellation.
[ PGE_Presentation_TransformerHum.pdf - Read/Download File
PanPhonics Panels in Active Control of Sound
Dec 20, 2002 ... Applications of active control of sound, state-of-the-art. .... (ANC) (also called Active Noise Cancellation). The active noise ... tion the secondary sources absorb the original sound field being directed to them. In the ... frequency humming noise of a transformer with a loudspeaker situated near the transformer.
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Design of Active Noise Control Systems With the - Texas Instruments
The Development of Active Techniques for Acoustic Noise Control. 5 .... Using the TMS320C2x Simulator to Observe Noise Cancellation. 55.
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Noise and Vibration Control of Combustion Engine Vehicles - DiVA
or vibration field by interference with a secondary anti-field. The thesis focus ... The thesis embraces the areas of active noise and vibration control as well as ... measurements and installations has been the natural method of interchange during ...... noise control in which the subject of control was electrical transformer noise.
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Active Noise Control in Propeller Aircraft - DiVA
transformers and compressors radiate noise. In cars, boats, trains and ... Instead it focuses exclusively on the field of active noise control. ... However, in enclosures whose dimensions are of the order of a ... At the BPF, the sound field is usually.
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Active control of periodic fan noise in laptops: spectral width
active noise control of synthetic tones combined with laptop fan noise, ... Tests on other types of tonal noise sources, like an electrical transformer, were also carried out. However, its wider applicability to the cancellation of tonal noise has been proved compromised ..... control, and noise reduction level, measured in a small.
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Analysis on Technical Trends of Active Noise Cancellation for
We analyze the technical trend of active noise cancelation in Korea and internationally. The result of the study indicates that active noise cancelation has been applied to various fields such as vehicles, airplanes ... such as engines, fans, transformers and ventilators. To ... This method is to measure interior noise using 2 ...
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Active Control of Sound and Vibration History – Fundamentals
In the context of the active cancellation of sound fields a question often posed is ... reported that cattle grazing near a large power transformer gave less milk. ... ment, sign reversal, and time delay according to the acoustic path length. However ...
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a study of dc permanent magnet motor noise - Purdue e-Pubs
Jan 5, 1994 ... mecllanical transfer function measured for the motor and for the motor in the fan scroll asse~ably. ..... 2.2 Transformer Sound Output for Sine Wave Current Input . ..... Active noise suppression, where speakers are used to ... E3y examining the magnetic field shape for a DC permanent magnet micromotor,.
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Implementation of a Transformer-Less Common Mode Active Filter
The noise source is modeled as a voltage source in series with a capacitor Cs and an inductor ... mentation of an active filter employing a HF power amplifier ... The reduction of CM emissions is an important issue in all fields of ... the types of parameters that are used in the measurement and in the ..... Cancellation”, in Proc.
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Guide To Solving AC Power EMF Problems In Commercial Buildings
tromagnetic interference (EMI) that emanate from transformers, network protectors, secondary feeders .... Measurements of Residential Power Frequency Magnetic Fields, written by the IEEE Magnetic ... Active or passive magnetic field cancellation technology. ... verses unbalanced input amplifiers, signal-to-noise ratio, etc.
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An overview of active noise control - Safety Science Monitor
Feb 28, 1998 ... Active noise control is commonly described as the cancellation of unwanted noise by .... the acoustic field may be measured and utilised for control. .... Power Transformers notably hum and are very much a tonal problem best ...
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