Research and Digital Modelling of Environmental Noise and its Reduction by applying Light Structures ; Aplinkos triukšmo ir jo mažinimo, taikant lengvas konstrukcijas, tyrimai bei skaitinis modeliavimas

Sujets

• Chamber
• Environmental noise

Informations

• Publié par: vilnius_gediminas_technical_university
• Publié le: 01 janvier 2009
• Nombre de lectures: 23
• Langue: English
• Poids de l'ouvrage: 2 Mo

Extrait

Raimondas GRUBLIAUSKAS
RESEARCH AND DIGITAL MODELLING
OF ENVIRONMENTAL NOISE
AND ITS REDUCTION BY
APPLYING LIGHT STRUCTURES
Summary of Doctoral Dissertation
Technological Sciences, Environmental Engineering (04T)
1628-M
Vilnius 2009VILNIUS GEDIMINAS TECHNICAL UNIVERSITY
Raimondas GRUBLIAUSKAS
RESEARCH AND DIGITAL MODELLING OF
ENVIRONMENTAL NOISE AND ITS
REDUCTION BY APPLYING LIGHT
STRUCTURES
Summary of Doctoral Dissertation
Technological Sciences, Environmental Engineering (04T)
Vilnius 2009
1Doctoral dissertation was prepared at Vilnius Gediminas Technical University in
2005–2009.
Scientific Supervisor
Prof Dr Habil Donatas BUTKUS (Vilnius Gediminas Technical University,
Technological Sciences, Environmental Engineering – 04T).
Consultants:
Assoc Prof Dr Vytautas NAINYS (Vilnius Gediminas Technical University,
Technological Sciences, Mechanical Engineering – 09T),
Prof Dr Habil (Vilnius Gediminas Technical
University, Technological Sciences, Environmental Engineering – 04T).
The dissertation is being defended at the Council of Scientific Field of
Environmental Engineering at Vilnius Gediminas Technical University:
Chairman
Assoc Prof Dr Raimondas Leopoldas IDZELIS (Vilnius Gediminas
Technical University, Technological Sciences, Environmental Engineering –
04T).
Members:
Prof Dr Juvencijus Stanislovas DEIKUS (Lithuanian University of
Agriculture, Technological Sciences, Environmental Engineering – 04T),
Prof Dr Habil Kazimieras RAGULSKIS (Kaunas University of Technology,
Technological Sciences, Mechanical Engineering – 09T),
Dr (Vilnius Gediminas Technical University,
Technological Sciences, Environmental Engineering – 04T),
Assoc Prof Dr (Vilnius Gediminas Technical University,
Technological Sciences, Civil Engineering – 02T).
Opponents:
Dr Habil Algimantas BUBULIS (Kaunas University of Technology,
Technological Sciences, Mechanical Engineering – 09T),
Dr Egidijus PETRAITIS (Vilnius Gediminas Technical University,
Technological Sciences, Environmental Engineering – 04T).
The dissertation will be defended at the public meeting of the Council of Scientific
Field of Environmental Engineering in the Senate Hall of Vilnius Gediminas
Technical University at 1 p. m. on 12 Juni 2009.
l. 11, LT-10223 Vilnius, Lithuania.
Tel.: [phone]; fax [phone];
e-mail: [e-mail]
The summary of the doctoral dissertation was distributed on 11 May 2009.
A copy of the doctoral dissertation is available for review at the Library of Vilnius
l. 14, LT-10223 Vilnius, Lithuania).
© Raimondas Grubliauskas, 2009
2
$<?.V683?$?*$HYGDL(PGLLQ6D$V8VG7'HWFK7Q?L$FHDOHX8Q6L.Y3H?UVDLLWD\HU6VD9X,O,?.W1H6NGLURVDDRDNGWOORDWL5VVILNIAUS GEDIMINO TECHNIKOS UNIVERSITETAS
Raimondas GRUBLIAUSKAS
TAIKANT LENGVAS KONSTRUKCIJAS,
TYRIMAI BEI SKAITINIS MODELIAVIMAS
Daktaro disertacijos santrauka
Technologijos mokslai, (04T)
Vilnius 2009
3
2$LW0Q?$U?ND,51QH,D0D2YD158L-U2ML2NU?,RW0U3,/.D6SO7L,QNRV.L?Disertacija rengta 2005–2009 metais Vilniaus Gedimino technikos universitete.
Mokslinis vadovas
prof. habil. dr. Donatas BUTKUS (Vilniaus Gedimino technikos
universitetas, technologijos mokslai, – 04T).
Konsultantai:
doc. dr. Vytautas NAINYS (Vilniaus Gedimino technikos universitetas,
technologijos mokslai, – 09T),
(Vilniaus Gedimino technikos
– 04T).
Disertacija ginama Vilniaus Gedimino technikos universiteto Aplinkos
mokslo krypties taryboje:
Pirmininkas
doc. dr. Raimondas Leopoldas IDZELIS (Vilniaus Gedimino technikos
– 04T).
Nariai:
prof. dr. Juvencijus Stanislovas DEIKUS
– 04T),
prof. habil. dr. Kazimieras RAGULSKIS (Kauno technologijos
universitetas, technologijos mokslai, nerija – 09T),
dr. (Vilniaus Gedimino technikos universitetas,
– 04T),
doc. dr. R (Vilniaus Gedimino technikos universitetas,
technologijos mokslai, a – 02T).
Oponentai:
habil. dr. Algimantas BUBULIS (Kauno technologijos universitetas,
technologijos mokslai, – 09T),
dr. Egidijus PETRAITIS (Vilniaus Gedimino technikos universitetas,
– 04T).
mokslo
9 m. 12 d. 13 val. Vilniaus Gedimino
.
ekio al. 11, LT-10223 Vilnius, Lietuva.
Tel.: [phone]; faksas (8 5) 270 0112;
el. p [e-mail]
9 m. g 11 d.
ekio al. 14, LT-10223 Vilnius, Lietuva).
VGTU leidyklos „Technika“ 1628-M .
© Raimondas Grubliauskas, 2009
4
P?WVDWYDW\QERV?ULYQ?WLQVHPUULLMWWRDWQYWDUUNHDLRL?Q?LOQHLU6LSMLRQVDWNHUWDUYVWLRRW6?FDLUN,NULHDDLMQL?UOHHQXLL?OQMLFOVLRLNLQRL3OLSND?LVLLDMOUVVNWRPP?LVMRDMULQJGRHORLQEKMF?HNWLLSVEDW9H1WULV?UJHVYRLQQXUVHVLWUR?NVUMDG?DW6R?WNYSPLHNFVKJDQQWLNNLRSVNQLHQD?L?QYDH.U?LDMDDLVD?UDNHRDVLNNKUHLFVDQMXLLUXHQQLF?LQXL?VHRFNQLLSOLSWDLD*LPDOKVRNQUH/ELLHNWXXYWRDVPD?RHQPH?DVRK?ONULHRV,X.Q6LYYPHOULVDLRWQHVWW6<K.R8RWRHUFLKHQVRWOWRJHLDMRRSVVGPLRNDV?OHD$LUVVDSDOOLWQRNQROVDLDQV?RLQRHLURLRMKDHLRUVDNUDDO?QURVRLW?YQDUUMNDUNDVWDWGDODR$W$'8L?VVHGUYW'DOFQLRMDQDEWXVVQUJMLLQQDPRDLDY'LVHU?DDLPRHD$WSDONLQ?NLRQVL?LDQ?LHQHUUJL?MVRNVD'LVUUDNLUDJ?OWPRWHY?D?U?NLR9VOLLDXVHLWLHRFWNFUQ\NSVWXLLHHVVWWWDUL\OERRHVRHSRDVO?WGR\YMUHDHKQNKVQLR?OQRUEMLUU?IHODLLRJGLM3RWVDD$N7U(D?Y$WXRLWH?DRUVNROUWLUWDUMVLNU\HDQLLH?DQLWWFHQFOKJQMLVNPRVNX?WGeneral characteristic of the dissertation
Problem of the work. With a rapid development of industrialisation and
urbanisation, the environmental pollution has greatly increased. Upon
automating the manufacturing industry and agriculture, with traffic flows in
towns and residential areas increasing and household equipment becoming
more modern, the number of acoustic discomfort zones is rapidly growing.
People are exposed to noise not only at workplaces abut also on the streets
and at home. As maintained by doctors, noise reduces immunity of the
organism and, as a source of chronic stress, has an adverse effect on the central
nervous system and causes various health disorders. Even a relatively low
noise of 60–70 dB causes a headache, dizziness, squeak in the ears, insomnia,
and worsens memory, attention and orientation. A noisy environment reduces
working efficiency, reaction speed, movement coordination and increases
nervous strain and a risk of traumas.
The noise dispersed by stationary sources may be reduced by replacing
components with less sounding ones, applying rubber, plastic or other materials
on the surface of installations. If it is impossible to reduce noise in the place of
its generation, hoods are fitted out, premises are insulated and noise suppressing
systems are used (noise reducing barriers, volumetric noise absorbers, wall
insulation with noise-proof materials).
The dispersion of traffic-generated noise is reduced by noise suppression
walls, green plantations and buildings shields. Other effective measures include
vehicle speed limitations, replacement of a road paving surface, traffic
limitation and regulation. When analysing the possibility of implementing noise
reduction measures and methods, a digital modelling of noise dispersion,
evaluating the topographic and meteorological conditions as well as traffic
characteristics in the locality, is very important.
Topicality of the problem. Noise is generated by various technological
processes. Noise level limits are exceeded not only at workplaces or in
enterprise territories but also on the outside, i.e. in the residential area. Thus, the
occupational safety conditions at workplaces are violated, quiet rest is disturbed
and human health is undermined in the residential area. It is essential to limit
the dispersion of the noise from mobile and stationary sources by absorbing or
insulating it with the help of noise suppression walls. Various materials of the
new generation, whose acoustic properties are not researched to the full extent,
are used for their structures. This is particularly important when replacing large-
dimensioned and solid materials with light structures that are easier to assemble
and more suitable aesthetically. This work used the target experimental base
5and equipment necessary for the laboratory research on acoustic properties of
such materials and structures made of them.
Object of the work. Mobile and stationary sources of noise and a noise
suppression chamber.
Aims of the work
1. To evaluate the dispersion of noise from stationary and mobile sources in
the environment and provide for effective techniques and measures to
reduce it by using a noise suppression chamber for research into acoustic
properties of materials.
2. To estimate the efficiency of the noise reduction measures through
modelling noise dispersion in the environment.
Tasks of the work
1. To design and fit out a noise suppression chamber and use it for research
into the noise absorption and insulation properties of different materials.
2. To determine the levels and dispersion of noise from different mobile and
stationary sources of noise.
3. To determine the longitudinal sound wave attenuation coefficient for
individual building materials.
4. Through laboratory experiments in the noise suppression chamber, to
estimate the reduction of a noise level in building structures and determine
the airborne sound attenuation index DL for them.R
5. To envisage measures for reduci