Acoustic analysis of Prof. Julius Okojie central research ... Web viewAcoustic analysis of prof. Julius okojie central research ... The target in design is to select such an elastic

Arc 507

A paper on the

Acoustic Analysis of Professor Julius .A Okojie Central Research Laboratory

Presented by

Omonlumhen Omonye – arc/09/7419

Onigbinde Fikayo – arc/09/7422

To

Professor O.O Ogunsote

Arc. Ganiyu

Of the

Department Of Architecture

Federal University of Technology Akure

c

Table of ContentsABSTRACT..................................................................................................................................................................3

Acoustic analysis of Prof. Julius Okojie central research laboratory

CHAPTER 1.................................................................................................................................................................4

CHAPTER 2.................................................................................................................................................................5

CHAPTER 3...............................................................................................................................................................10

CHAPTER 4...............................................................................................................................................................12

CONCLUSION...........................................................................................................................................................13

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ABSTRACTAcoustic analysis of prof. Julius okojie central research laboratory is a research building in FUTA close to

the SET and SEMS building, the acoustic of the building is fair, the building is facing a major road to the

staff quarters, from the research carried out the average noise level of the building is 115dB, and a noise

level of 130dB was recorded at a time due to noise from the road from moving vehicles, using the installed

sound level meter on the phone. Major sources of noise are the floor tiles, generator close to the building,

the main road, and the adjoining building, ways of solving these problems are also discussed in the report.

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CHAPTER 1

GENERAL INTRODUCTION TO ARCHITECTURAL ACOUSTICSThe term acoustics is often taken to be an abstract phenomenon but in essence it is simply the science of

sound. The acoustical environment of a work space is given little or no attention during project planning

and design. The functionality and aesthetics of the work space are usually the primary focus of the

designer. Providing a comfortable environment for employees contributes significantly to their optimum

performance and absenteeism.

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CHAPTER 2ACOUSTIC ANALYSIS OF STUDY BUILDING

The central research laboratory is a research facility that carries out research on organic products it contains

four laboratories, the director’s office, a conference room and conveniences. The laboratories present there

are

1. Diagnostic laboratory

2. Bioresearch laboratory

3. Nutritional laboratory

4. Analytical laboratory.

The building is located at the obanla campus of the federal university of technology, akure. It is surrounded

by the following buildings

1. The school of management technology

2. The graduate research centre

3. The school of postgraduate studies

The central research laboratory is a two storey building as shown in the photographs below.

Site plan

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Approach view

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Right side elevation

Left side view in perspective

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Rear view in perspective

Two groups of noise sources have been identified as follows:

1. Internal noise sources

2. External noise sources

Internal noise sources:

The following have been identified as the sources of internal noise.

1. Movement of people within the building

2. the machines located in offices and laboratories

3. Noise generated from conversations from people within the building

External noise sources:

The following were identified as external noise sources:

1. Sound from vehicles

2. Sound from adjoining buildings

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3. Noise from people around the building

4. Noise from the standby generator

5. Noise generated from climatic conditions such as rainfall and thunder storms

6. Noise originated at access roads

7. Noise originated from student activities such as riots, campaigns etc.

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CHAPTER 3THE ACOUSTIC PROPERTIES OF THE BUILDING

Wall finishes: all walls are finished with emulsion paint which has little or no impact on the

acoustics of the building.

Floor finishes: all floor surfaces in the building are finished with 450mm by 450mm ceramic tiles as

shown in the photograph below. It produces poor acoustics properties.

Ceiling finish: the ceiling is finished with PVC sheets all through the building

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Fenestrations: the doors present are PVC doors. The windows present are glass sliding windows

with aluminium frame. There are also perforated (screen walls).

Presence and series of sharp edges and corners: The presence of sharp corners and edges of the walls cause

an abrupt change of direction and tends to increase the intensity of the sound at these edges through the

corridors. Therefore the facility has a high propensity for reverberation considering the fact that the

corridors are usually empty.

Interior view of the first floor

Interior view from ground floor

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CHAPTER 4METHODS OF IMPROVING GENERAL ACOUSTICS OF STUDY BUILDING

The following are ways in which the acoustics of the building can be improved

Frame stiffness of doors and windows

The doors and window panels must be made stiff to reduce sound transmission through the hinges. This

does not allow sound transmission from the corridors into the offices. Also noise attached to the opening

and closing of doors and windows are reduced. This can also be achieved by oiling the hinges as at when

due to reduce noise.

Provision of buffer zones

The introduction of trees in the courtyard and around the building obstructs and absorbs unwanted sound

that could be transmitted around and into the building respectively. This is important as the height of the

hedges is inadequate to direct noise away from the building.

Sound insulation of furniture and appliances

Instead of the very polished and exposed surfaces of the furniture in the building, it could be covered or

clad with foams or cushion which reduces sound reflection at these surfaces. Also the noise emanating

from appliances like the ceiling fans and the air conditioners could be minimized by the method of

reducing the amount of energy and displacement transmitted to the surface below the equipment. This is

achieved by installing an elastic element between the equipment and the bearing surface. Each elastic

element has a natural vibration frequency. The target in design is to select such an elastic element that its

natural vibration frequency is several times lower than the disturbing frequency.

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Source isolation

Isolation in the form of wooden box lined with sound absorbent materials could be used to isolate the UPS

or the computer. Also the screening of the computer set, photocopiers scanners etc would reduce the level

of noise in the interior spaces of the offices

Reduction of building noise

The reduction can be achieved through sound absorbing materials which can be attached to the walls and

panels in the building in such a way that when sound energy hits the material most are absorbed while

some few are reflected leaving very little to get transmitted. These absorbent materials could be;

1. Fibrous material: absorbs sound by friction drag on air moving through pores.

2. Volume resonators: though designed to absorb narrow band of frequencies, it consists of air cavity

within large enclosures

3. Panel resonators: thin plywood or other materials in front of a sealed airspace containing absorbent

materials. Not only do these materials have good acoustic properties, they also produce good

aesthetic qualities.

CONCLUSIONThe acoustic condition of the prof. Julius okojie central research laboratory building cannot be

regarded as out rightly being poor because the fact remains that no building has perfect habitating

qualities in that the more the acoustic standards are achieved in detriment to other functional

characteristics of the building the more criticism it receives in respect to this defects. However, the

proffered solutions given in this report is a form of adjustment to the built structure and not those to

be considered at the inception of the construction as this would be non relevant to this report.

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Acoustic analysis of Prof. Julius Okojie central research ... Web viewAcoustic analysis of prof. Julius okojie central research ... The target in design is to select such an elastic