scholarly journals RESEARCH OF LOW FREQUENCY GAS PRESSURE OSCILLATIONS IN DUST SYSTEMS OF POWER PLANTS USING PROGRAM PROVISION

Akustika ◽  
2019 ◽  
Vol 34 ◽  
pp. 123-126
Author(s):  
Andrey Vasilyev
Keyword(s):  
Power Plants ◽  
Negative Impact ◽  
Mechanical Systems ◽  
Low Frequency ◽  
Gas Pressure ◽  
Frequency Noise ◽  
Pressure Oscillations ◽  
Noise And Vibration ◽  
Low Frequency Oscillations ◽  
Duct Systems

Vibration and related with it mechanical noise of power plants and joining mechanical systems are the factors negatively impacted not only to the health of workers, but also to the durability, reliability, productivity and other parameters of power plants. Significant input into generation of vibration and of low frequency noise are bringing pressure oscillations in ducts. Some approaches and results of program provision development for calculation of low frequency gas pressure oscillations in ducts of power plants are described. Results of program provision approbation are presented. Using of suggested program provision may be useful for calculation and design of duct systems of power plants and allows increase the efficiency of low frequency oscillations reduction in ducts of power plants systems and noise and vibration negative impact.

Experiences with Flow-Induced Vibration and Low Frequency Noise Due to Rotating Stall of Centrifugal Fan

1987 ◽  
Vol 6 (2) ◽  
pp. 76-87 ◽  
Author(s):  
Ken Okada
Keyword(s):  
Power Plants ◽  
Low Frequency ◽  
Rotating Stall ◽  
Frequency Noise ◽  
Centrifugal Fan ◽  
Low Frequency Noise ◽  
Flow Induced Vibration ◽  
Rotating Speed ◽  
Duct Systems ◽  
Centrifugal Fans

In recently constructed electric power plants, the forced draft fan (FDF), induced draft fan (IDF) and boost up fan (BUF) centrifugal fans and duct-systems have become larger in capacity and limited in space every year. As a centrifugal fan is enlarged, the diameter of the impeller is enlarged and its rotating speed is lowered. Therefore, there is an increasing tendency to generate a low frequency noise.5 In the case of an IDF or BUF, the rotating stall of the centrifugal fan frequently causes low frequency noise, since the inlet flow is often throttled during operation. If the hydrodynamic and acoustical characteristics are insufficient, a strong flow-induced vibration with low frequency noise is generated in the fan-duct system, and not only are problems caused in terms of structural strength, but also physical and physiological problems are induced due to low frequency noise.

APPROACHES TO CLASSIFICATION OF REDUCTION METHODS OF LOW FREQUENCY NOISE AND VIBRATION OF POWER PLANTS

Akustika ◽  
2021 ◽  
pp. 52-60
Author(s):  
Andrey Vasilyev
Keyword(s):  
Power Plants ◽  
Internal Combustion Engines ◽  
Vibration Reduction ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Noise And Vibration ◽  
Reduction Methods ◽  
Noise And Vibration Reduction

The importance of the problem of low-frequency noise and vibration reduction now may be considered as urgent. Increased influence of low-frequency noise and vibration may cause both human health problems and equipment damage. Power plants (internal combustion engines, compressors, heat-exchanges etc.) are one of the main low-frequency noise and vibration sources. The principles of classification of methods of power plants low-frequency noise and vibration reduction are suggested. Author is proposing energetic approach, according of which all the methods and arrangements of reduction may be classified as passive (adaptive and non-adaptive), active and hybrid passive-active. The classification is illustrated by the different examples, including constructions of mufflers and dampers, some of which are developed by author.

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