Anna ChrapońskaSilesian University of Technology · Department of Measurements and Control Systems
Anna Chrapońska
Master of Science
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14
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Publications (14)
Analysis of the structural vibration, under the sound excitation is an important part of the quality assurance during the design process of devices. One of the most commonly used method is Laser Doppler Vibrometry (LDV). However, under the rapid fluctuations of temperature, structural resonances are shifted into the other frequencies. In such situa...
![Figure 1. The experimental setup [42].](profile/Chukwuemeke-Isaac/publication/342348314/figure/fig1/AS:904905002868736@1592757573355/The-experimental-setup-42_Q320.jpg)
Noise may have a negative impact on humans health and well being. Noise is a direct result of the vibration of structures. Many industrial workers and people using household appliances may be exposed to these harmful factors. To minimize their negative consequences, different approaches to noise and vibration reduction may be applied, e.g., active,...
Electric appliances used in workplaces and everyday life often generate a low-frequency noise, which affects human body systems. Passive methods employed to reduce noise are not effective at low frequencies. The classical approach to active noise control practically involves the generation of local zones of quiet, whereas at other areas the noise i...
Noise and vibration are common issues that may have a negative impact on human’s’ health. To minimize their consequences, several vibroacoustical methods may be employed. One well-known method is Piezoelectric Shunt Damping (PSD). Over the years, many approaches have been investigated, from passive, state switching circuits to active pulse-switchin...
Nowadays, noise generated by devices is a serious issue in industry and in everyday life, because it may cause health damage to humans. In this research, a cubic rigid device casing built of double-panel thin steel walls is employed to reduce noise emitted from an enclosed noise source. Double-panel structure is used because of good sound insulatio...
Passive noise reduction methods require thick and heavy barriers to be effective for low frequencies and those clasical ones are thus not suitable for reduction of low frequency noise generated by devices. Active noise-cancelling casings, where casing walls vibrations are actively controlled, are an interesting alternative that can provide much hig...
Thin plates, in the form of individual panels or whole device casings, often separate the noise source from its recipients. It would be very desirable if the panels could effectively block the sound transmission preventing noise from further propagation. This is especially challenging to achieve at low frequencies. A promising approach, intensively...
Reduction of low frequency noise generated by devices is an important problem. Passive noise reduction methods require thick and heavy barriers to be effective for low frequencies. Active control of casing walls provides much higher low frequency noise reduction, and in such system, compared to classical Active Noise Control systems, a global noise...
The active casing approach is a method to reduce noise generated by a device enclosed in a casing. If the casing provided with the device is thin-walled, control inputs can be applied directly to it, and the whole structure can be used as an active noise barrier. It results in a global noise reduction instead of local zones of quiet when appropriat...
Semi-active control methods are well known in context of structural vibration reduction. Despite of lower efficiency in comparison to the active methods, they are still the alternatives providing several advantages. The main benefit is that no additional energy is added to the system, which guarantees stability of the whole system. In addition, sem...
The paper presents a comprehensive use of acoustic camera as a device
for localisation of the undesirable sound sources. The research covered various
situations: electrical motor failure, cooler leakage, noisy electronic components
and acoustic emission of household appliance and floor-standing fan. The tests
were performed on a previously construc...
Projects
Project (1)
The main objective of the proposed project is to further develop the theoretical basis for the noise reducing casing approach (passive, semi-active and active) and formulate a thorough theory, which can be used in the future for successful commercialisation.
The research has been supported by the National Science Centre, decision no. DEC-2017/25/B/ST7/02236, Poland.
