Single-chip TV noise reduction

The basic results of calculation and research works carried out in the process of creation of power unit of regional passenger airplanes’ family are given. The design features of the propulsion engines and engine of the auxiliary power plant are described. The aforementioned propulsion system includes propulsion engines D-436-148 and engine AI-450-MS of auxiliary power plant. In order to comply with the requirements of Section 4 of the ICAO standard (noise reduction of the aircraft in site), in part of ensuring the noise reduction of engines, when creating the power plant of the An-148/An-158 aircraft family, a single- and double-layer acoustic filler was used in the structure of the engine nacelle and air intake. The use of electronic system for automatic control of propulsion engines such as FADEC and its integration into the digital airborne aircraft complex ensured the operation of engines, included in the power plant provided with high specific fuel consumption, as well as increased the level of automation of the power plant control and monitoring, and ensured aircraft automation landing in ICAO category 3A. In addition, the use of the aforementioned electronic system, allowed to operate the power plant of the aircraft in accordance with technical status. The use of the AI-450-MS auxiliary power plant with an electronic control system such as FADEC, and the drive of the service compressor from a free turbine, eliminated the effect of changes in power and air takeoff, on the deviation of the engine from optimal mode, which also minimized the fuel consumption. The use of fuel metering system TIS-158, allowed to ensure control of its condition and assemblies, without the use of auxiliary devices, built-in control means. In the fire protection system, the use of the electronic control and monitor unit, as well as the use of digital serial code for the exchange of information between the elements of the system and the aircraft systems, has reduced the number of connections, which increased the reliability of the system and reduced its weight characteristics.

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Design of Noise Reduction Output Filter for Induction Motor Using H-Bridge Inverter

The Journal of Next-generation Convergence Technology Association ◽

10.33097/jncta.2020.04.06.595 ◽

2020 ◽

Vol 4 (6) ◽

pp. 595-600

Author(s):

Hyun-Seob Cho ◽

Keyword(s):

Noise Reduction ◽

Induction Motor ◽

Output Filter

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AN IMPROVED ARMORED VEHICLE KRAZ “FIONA” NOISE SILENCER

Avtoshliakhovyk Ukrayiny ◽

10.33868/0365-8392-2019-1-257-21-26 ◽

2019 ◽

pp. 21-26

Author(s):

Volodymyr Fedorov ◽

Vasyl’ Yanovsky ◽

Dmytro Kovalshuk

Keyword(s):

Noise Reduction ◽

Speed Of Sound ◽

Acoustic Waves ◽

Noise Level ◽

Combustion Engine ◽

Environmental Aspect ◽

Exhaust Gases ◽

Ecological Requirements ◽

On The Road ◽

Armored Vehicle

Ecological requirements for cars grow from year to year, both in the world as a whole, and in Ukraine in particular. This is especially true of noise pollution. Additionally, noise reduction becomes relevant, taking into account the conduct of military operations during the last 5 years on the territory of Ukraine. The war has caused a special need for military vehicles for which masking properties are vital. Noise is a serious disincentive factor. Therefore, its reduction for a military vehicle, apart from the environmental aspect, is of a purely military nature, that is, it is extremely important. The car has many sources of noise there are many ways to deal with them. One of the most powerful source of noise is the sleeping bag. This kind of noise is reduced by means of silencers of noise. The vast majority of silencer data in the basis of its design has a reactive (or resonant) muffler. To calculate the jet silencer you must know the speed of sound in the sleeping bags. In order to increase the acoustic efficiency of reactive and resonant mufflers of exhaust gases noise of the ICE of cars, an experimental method was proposed for determining the speed of sound in the sleighs. Implementation of the method is carried out by measuring the attenuation of acoustic waves. The noise level of the bedrooms is measured without silencer and silencer. Based on the data obtained, the noise reduction performance of the residual is established. From the well-known formula, based on the calculation of the efficiency of the silencing of a jet muffler, a formula is obtained for calculating the speed of sound in the sleeping quays. In this formula, all parameters are known: the level of silencer efficiency, the noise level of the sleeping, the ratio of areas of cross sections of the muffler and the inlet pipe and the length of the muffler. The sound speed thus established can continue to be used not only for engines of the type for which measurements and calculations were made, but also with a certain approximation for some other types of engines. This method provides high accuracy for determining the required parameter. In the given work on the example of the armored car KrAZ “Fiona” the calculation of efficiency increase of the reactive silencer is made due to the above-mentioned method. Also, the projected decrease in the external noise level of the KrAZ Armored Vehicle “Fiona” is considered by determining the speed of sound in the recesses on the trunk cycle on the road with acceleration up to speed of 50 km/h (75 km/h) and the movement with this speed, as well as when driving at a speed of 45 km/h. Keywords: transport, armored car, internal combustion engine, exhaust, exhaust gases, noise, source, acoustic efficiency, acoustic efficiency, speed of sound, jet muffler.

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Common-mode Noise Reduction Circuit Design for Biosignal Acquisition System—in Comparison with the DRL

IEEJ Transactions on Fundamentals and Materials ◽

10.1541/ieejfms.139.657 ◽

2019 ◽

Vol 139 (12) ◽

pp. 657-662

Author(s):

Minghui Chen ◽

Jianqing Wang ◽

Daisuke Anzai ◽

Georg Fischer

Keyword(s):

Noise Reduction ◽

Circuit Design ◽

Acquisition System ◽

Common Mode

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Effect of Bypass Capacitor in Common-mode Noise Reduction Technique for Automobile PCB

IEEJ Transactions on Fundamentals and Materials ◽

10.1541/ieejfms.130.479 ◽

2010 ◽

Vol 130 (5) ◽

pp. 479-480

Author(s):

Takanori Uno ◽

Kouji Ichikawa ◽

Yuichi Mabuchi ◽

Atushi Nakamura

Keyword(s):

Noise Reduction ◽

Reduction Technique ◽

Common Mode ◽

Noise Reduction Technique

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A Carrier-Phase Control Suitable for Conducted EMI Noise Reduction in a Multiple-Converter System

IEEJ Transactions on Industry Applications ◽

10.1541/ieejias.131.811 ◽

2011 ◽

Vol 131 (6) ◽

pp. 811-819

Author(s):

Michio Tamate ◽

Akio Toba ◽

Yasushi Matsumoto ◽

Keiji Wada ◽

Toshihisa Shimizu

Keyword(s):

Noise Reduction ◽

Carrier Phase ◽

Phase Control ◽

Conducted Emi

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Low-Dielectric-Constant Materials for ULSI Interlayer-Dielectric Applications

MRS Bulletin ◽

10.1557/s0883769400034151 ◽

1997 ◽

Vol 22 (10) ◽

pp. 19-27 ◽

Cited By ~ 86

Author(s):

Wei William Lee ◽

Paul S. Ho

Keyword(s):

Packing Density ◽

Propagation Delay ◽

Single Chip ◽

Crosstalk Noise ◽

Metal Line ◽

Total Delay ◽

Interlayer Dielectric ◽

Low Dielectric ◽

Interconnect Delay ◽

Interconnect Technology

Continuing improvement of microprocessor performance historically involves a decrease in the device size. This allows greater device speed, an increase in device packing density, and an increase in the number of functions that can reside on a single chip. However higher packing density requires a much larger increase in the number of interconnects. This has led to an increase in the number of wiring levels and a reduction in the wiring pitch (sum of the metal line width and the spacing between the metal lines) to increase the wiring density. The problem with this approach is that—as device dimensions shrink to less than 0.25 μm (transistor gate length)—propagation delay, crosstalk noise, and power dissipation due to resistance-capacitance (RC) coupling become significant due to increased wiring capacitance, especially interline capacitance between the metal lines on the same metal level. The smaller line dimensions increase the resistivity (R) of the metal lines, and the narrower interline spacing increases the capacitance (C) between the lines. Thus although the speed of the device will increase as the feature size decreases, the interconnect delay becomes the major fraction of the total delay and limits improvement in device performance.To address these problems, new materials for use as metal lines and interlayer dielectrics (ILD) as well as alternative architectures have been proposed to replace the current Al(Cu) and SiO2 interconnect technology.

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