Examples of Engineering Service

Case for Technical Service (Noise)

Evaluation on Effects of Noise at Factory in ○○

Overview and Purpose

Design of measures for reduction of factory facilities generating noise according to occurrence of public complaints A site survey on generation of noises by the factory under the condition of normal operation / A optimal design of measures for reduction of noises from the factory

Criteria of Noise

Less than 45dB(A) at night in the region of public complaints

Scope of Performance of Project

Measuring and evaluating the noise level of the sources of noises and sound receiving points Noise analysis (simulation of sound field analysis) / Submission of a report on measures for reduction for facilities generating factory noises

Measures for Soundproof

Result of Noise Analysis and Evaluation

Places expecting public complaints 60.3dB(A) before measures / 44.2dB(A) after measures which satisfy the criteria of 45dB(A)

- Fig 2. Measuring Noise

- Fig 3. 3D Modeling of Areas Expecting Public Complaints

- Fig 4. Before Measure for Combined Noise Level

Evaluation on Effects of Noise of Railroad at Redevelopment Site in ○○

Overview and Purpose

Evaluation on effects of noises for apartment houses located nearby the railroad and subways Establishing a proper soundproof measure since inconvenience of residents of apartment houses since they move in.

Criteria of Noise

Outdoor noise less than 65dB(A) / indoor noise less than 45dB(A)

Scope of Performance of Project

Measuring on-site noises during day and night / Analysis and evaluation on measured data Noise analysis before and after measure (Simulation) / Presenting a measure plan

Proposal of Soundproof Measure (Soundproof Wall)

Result of Noise Analysis and Evaluation

Outdoor 63dB(A) / indoor 43.0dB(A) after measures for representative sound receiving point of the apartment house which satisfy the criteria

Evaluation on Effects of Noise from Cogeneration Plant

Overview and Purpose

Selecting an evaluation region and determining an allowable noise criteria through identifying the peripheral status within the project section

Evaluating effects of noises at the site boundary of the power plant and the inside of the building due to noises generated by facilities in the power plant

Criteria of Noise

Less than 60dB(A) at the height of 1.5m of the site boundary [Allowable Discharge Criteria]

Evaluation on effects of noises at the boundary of a site of the power plant

Evaluating effects of noises at the boundary of a site of the power plant due to noises generated from main sources of noises

Performing an analysis by using a commonly used software that is proper for a 3D outdoor acoustic analysis

Result of Review

As for Air Inlet Filter and Transformer, they make a great contribution to noises of low frequency.

Measures for Soundproof

Result of Noise Analysis and Comprehensive Evaluation

1. Expected Noise Level Before Soundproof Measure 68dB(A)

2. Expected Noise Level Before Soundproof Measure 55dB(A)

3. Result of Noise Analysis Satisfying ‘less than 60dB(A)’ Which is the criteria of noise at the boundary of a site of the power plant

Evaluation on Effects of Noises at Generator Room of ○○ Research Institute

Overview and Purpose

Selecting an evaluation region and determining an allowable noise criteria through identifying the current state within the site

Evaluating on effects of noises at the site boundary of civil petitioners due to noise generated by a generator installed at a generator room

Criteria of Noise

Less than 60dB(A) in the morning and evening [Criteria of Noise for Living Environment]

Specification of Sources of Noises and Level of Generated Noise

Generator Model: C2000 D6, Cummins Power Generation

Max, Cooling Air Flow Static Restriction of Radiator: 0.127kPa (약 13mmAq)
- Exhaust Air Volume 1,888㎥/min
- Air Supply Volume 2,066㎥/min

Evaluation on Effects of Noises

Evaluating effects of noises at the region of civil complaints due to noises generated from a generator

Performing an analysis by using a commonly used software that is proper for a 3D outdoor acoustic analysis

Result of Noise Analysis

Comprehensive Evaluation

A sound absorber and a elbow-typed sound absorber, a noise elbow are installed at an inlet and outlet part of a generator room.

A soundproof wall is additionally installed at the exhaust part of the civil petitioner’s side

At all floors of the region of public complaints, it is the maximum 59dB(A) which satisfies the noise criteria of ‘60dB(A)’.

Noise Analysis Results and Comprehensive Evaluation

Measures of Soundproof for Factory of ○○

Overview and Purpose

Analysis level of contribution of sources of noises and establishing measures by steps through identifying the current state within the site

Evaluating effects of noises at the site boundary of the nearby residential area due to noise generated by facilities installed in the factory

Criteria of Noise

‘Less than 50dB(A)’ at the height of 1.5m of the site boundary [Allowable Discharge Criteria]

General of Site

Since the sources of noises are diverse, establishing measures for soundproof by steps is required.

Establishing Measures for Soundproof

Comprehensive Evaluation

The targeted noise is about 49.0dB(A) at the site boundary of the nearby residential area after completing the measure of soundproof by steps, which satisfies the noise criteria of ‘Less than 50dB(A)’.

Evaluation on Effects of Noise at Construction of Company Building of ○○ E&C

Overview and Purpose

Selecting an evaluation region and determining an allowable noise criteria through identifying the current state within the site

Evaluating effects of noises at external walls of a building due to noise generated by a cooling tower installed at the outside

Criteria of Noise

Less than 60dB(A) in the morning and evening [Criteria of Noise for Living Environment]

Status of Sources of Noises and Data of Penetration Loss by Types of Glass Windows (Unit : dB(A))

Evaluation of Effects of Noise

Performing an analysis using a commonly used software that is proper for the outdoor 3D acoustic analysis

Evaluating effects of indoor noises after applying loss of penetration of walls and windows

Comprehensive Evaluation

After evaluating effects of noises for a cooling tower installed on the roof of the 4th floor and installing a noise reduction device (a sound absorber and a noise louver etc.) at the inlet/outlet of a low-noise typed cooling tower, it satisfied ‘less than 60dB(A)’ which is the criteria of noise at the site boundary or ‘less than 40dB(A)’ which is the criteria of noises at the inside of general offices as well.

- Fig 1. Result of Sound Field Analysis

Evaluation on Effects of Noises at Factory in ○○

Overview and Purpose

Selecting an evaluation region and determining an allowable noise criteria through identifying the peripheral status within the project section

Evaluating effects f noises at the site boundary and the nearby civil houses due to noise generated by facilities in the factory

Criteria of Noise

Less than 50dB(A) at the height of 1.5m of the site boundary

Overview of Project Section

A civil petition from a one-stored house at the point which is around 70cm away from the external wall of UT room.

Comprehensive Evaluation

It is a reliable level since the error between the actually measured on-site data and the analysis result prior to the measure of soundproof is ±1dB(A).

After establishing measures for soundproof, it was found that it satisfied ‘60dB(A)’ which is the criteria of noise at the representative civil petition point.

Measuring/Analyzing Level of Noises by Frequencies of Main Sources of Noise

- Fig 4. P1: 73.5dB(A)

- Fig 5. P2: 61.9dB(A)

- Fig 6. P3: 51.3dB(A)

Evaluation on Effects of Noises of Data Center at ○○ Site and Design of Measures

Overview and Purpose

Evaluating effects of noises generated by facilities on the region of civil petition through identifying the peripheral status within the project section

Criterial of Noise

Less than 45dB(A) during nighttime of the region of civil petition

Overview of Project Section

Selecting and measuring a representative sound receiving point by considering the operation time of an exhaust fan

The level of noise measured at the yard of the newly constructed building which is an expected representative civil petition point was 62.1dB(A).

Fig 1. Noise Map(Plan) of Noise Effect Evaluation

Fig 2. Noise Map(Elevation) of Noise Effect Evaluation

Comprehensive Evaluation

Constructed a soundproof panel and a noise louver on the 3rd floor, a noise louver at the outlet of a fire extinguishing gas room and the outlet of an electricity room on 1~2nd floor

After establishing measures for soundproof, it was found that it satisfied ‘45dB(A)’ which is the criteria of noise at the representative civil petition points.

Fig 3. The Whole View of Site and Selecting Representative Sound Receiving Points

Fig 4. Measuring On-Site Noise

Case for Technical Service (Noise)

Breaker 70 ton (Rock Breaker Laboratory) Noise 120dB Control

Fig 1. Result of Indoor Noise Sound Field Analysis (Before Measure)

Fig 2. Result of Indoor Noise Sound Field Analysis (After Measure)

Fig 3. Result of Outdoor Noise Sound Field Analysis (Before Measure)

Fig 4. Result of Outdoor Noise Sound Field Analysis (After Measure)

Fig 5. Measuring Noise

Fig 6. Breaker

Fig 7. Exhaust Fan

F16K Aircraft Noise Control Laboratory (Soundproof) / Ministry of National Defense (Level of Noise 130~120dBA)

Fig 1. The Whole View of Site

Fig 2. Result of Indoor Noise Sound Field Analysis

Evaluation on Effects of Noise and Vibration of Main Block of ○○ Special Steel

Fig 1. The Whole View of Site

Fig 2. Result of Indoor Noise Sound Field Analysis

Case for Technical Service (Noise)

Standby & Emergency Generator Room Simulation

Fig 1. NOSE-MAP (ODEON)

Fig 2. NOISE-MAP (ENPro)

Evaluation of Effects of Outdoor Noise of Outdoor Units at ○○ Site

Fig 1. Location of Sources of Noise (Outdoor Unit Room)

Fig 2. Evaluation on Effects of Outdoor Noise

Applying Soundproof Measures through Review on Noise Analysis

Fig 3. Installation On-Site Sound Louver and Sound Absorber

Case for Technical Service (Noise)

Cases of Services and Construction of Soundproof Facilities for Generators at Multiple Sites other than Iraq

[Design/Delivery/Installation of Enclosure at OO Site in Iraq]
(ENCLOSURE FOR MDU IRAQ MOE DIESEL POWER PLANT)

Fig 1. Construction and Review of Enclosure BIM

Fig 2. Enclosure Manufacture Item Packing and Site Construction