Wyniki wyszukiwania - Biblioteka Nauki

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 5

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: acoustic absorption

Sortuj według:

Ogranicz wyniki do:

Normative measurements of noise at CNC machines work stations

100%

Mika D. , Józwik J.

Advances in Science and Technology. Research Journal

2016

tom Vol. 10, nr 30

138--143

Minimisation of noise at a workstation is among fundamental tasks for maintaining safety at work, both in terms of health (the auditory system in particular) as well as work comfort. Thus, it is very important to systematically monitor noise levels by carrying out reliable measurements at a workstation. The method of performing noise measurements at workstations of specific machines is normalised so the results of such measurements for different machines is comparable. This paper presents noise measurements for DMC 635 numerically controlled milling machine, performed in accordance with PN ISO 230-5:2002 norm. The results showed that the level of noise at the operator’s workstation significantly exceeds the norm at certain machining parameters. The results of tests are concluded as detailed recommendation for the CNC machine tool operator to use hearing protection when at work.

Thermal and acoustic behavior of energy saving wall panel

86%

Khan, M. Yasir , Baqi A. , Sadique R. , Khan, M. Yasir , Baqi A. , Sadique R.

Systemy dźwiękochłonne do kształtowania akustyki wnętrz

72%

Jarosz M.

2018

tom nr 2

58--64

Thermal and acoustic behavior of energy saving wall panel

58%

Khan M. Y. , Baqi A. , Sadique R.

Archives of Civil Engineering

2021

tom Vol. 67, nr 4

303--316

Research and development of energy-efficient materials have been essential for sustainable infrastructure growth. A considerable amount of money is being spent on various energy stabilization techniques worldwide to attain thermal comfort in buildings. Thus, lowering the energy demand through green materials is vital to save energy and the environment. In this paper, a new form of Structural Insulated Panel (SIP) has been developed and referred to as Ferro Cellular Lightweight Concrete Insulated Panel (FCIP). Comparative thermal efficiency and acoustic performance of FCIP and brick masonry walls have been tested experimentally. The thermal results show that FCIP allows just 2ºC rise in the internal temperature of the room chamber in two hours, whereas the brick masonry allows 9.5ºC rise in the internal temperature of the room chamber for the same period. Similarly, the acoustic results show that FCIP has 0.85 sound absorption coefficient compared to 0.2 for brick masonry wall. Further, the cost-benefit analysis was conducted based on the electricity consumption results of a building produced by the eQuest energy simulation program. The outcome shows that the building’s lifetime running cost gets reduced to 50% when FCIP replaces the concrete/brick masonry envelope.

Akustyka wnętrz budynków oświatowych

51%

Jarosz M.

Izolacje

2016

tom R. 21, nr 11-12

32--36

W artykule przedstawiono w zarysie główne problemy związane z akustyką wnętrz budynków oświatowych: negatywny wpływ hałasu i nadmiernej pogłosowości pomieszczeń na użytkowników tych pomieszczeń, wymagania polskiej normy oraz wskazówki dotyczące możliwych rozwiązań technicznych.

The article outlines the key issues related to sound properties inside school buildings: the negative effect that noise and excessive reverberation has on the users of these premises, the requirements of the Polish Standards, and indications of available engineering solutions.