Acoustical modeling of urban building design

Assignment: Acoustics and Noise Control (Jan-Apr 2017)

Department of Mechanical Engineering Faculty of Engineering, UCSI University Kuala Lumpur EM417 Acoustics and Noise Control (Jan-Apr 2017) Assignment: Acoustical Modeling of Urban Building Design INSTRUCTION TO ALL STUDENTS: 1. One group is composed of 2-3 students.

2. Write all members' name and student ID at the cover page.

3. Each student need to fill up the peer assessment form.

4. The report must be submitted by 6 April 2017 (Thursday), in both hardcopy and soft-copy (wordfile). Late submission will not be entertained.

5. Marks distribution: Elements

Marks

Group Assignment

15

Peer Assessment Form

5

6. The group assignment marks are given based on the content and completeness of report, therefore make it precise enough within 20 pages.

7. Comply all the formatting as prescribed.

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Assignment: Acoustics and Noise Control (Jan-Apr 2017)

During an urban design, the buildings can be constructed in certain ratio to prevent noise propagation, from one region to another. Consider the twin-tower building structures can be modeled as follows: U

a Ρa

a

Figure 1: Building design with varied Ρ.

U is the upstream velocity of the noise source, a is the distance/length of the building section as prescribed, while Ρ is a real number with the range of 0.5 ≤ Ρ ≤ 1.5. The governing equation for this case is the two dimensional wave equation, given as: đ?œ• 2đ?‘˘ đ?œ• 2đ?‘˘ đ?œ• 2đ?‘˘ 2 = đ?‘? ( + ) đ?œ•đ?‘Ą 2 đ?œ•đ?‘Ľ 2 đ?œ•đ?‘Ś 2 where t is time, x and y are the spatial components, while u is the speed of mechanical displacement.

Setting a = 10, c = 1 and U = 1, compute the distribution of mechanical displacement speed, u across the entire domain as shown in Figure 1. Take Ρ = 0.50, 0.75, 1.00, 1.25 and 1.50.

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Assignment: Acoustics and Noise Control (Jan-Apr 2017)

In a report NOT MORE THAN 20 PAGES (only cover page and appendix can be excluded), include the following details: - COVER PAGE1.

Introduction to Engineering Acoustics and Urban Design*

2.

Methodology and Explicit Solution**

3.

Distribution of Mechanical Displacement Speed at Different Front Height, Ρ

4.

Discussion of Results***

5.

Conclusion

-APPENDIX* The introduction shall at least include: (1) the importance of noise control; (2) roles of acoustics in urban planning; (3) description of project. ** You may use other method other than explicit solution, such as Runge-Kutta method and implicit methods. Kindly refer to "Chapra and Canale (2010). Numerical Methods for Engineers, 6th Ed. Mcgraw Hill Higher Education" or any other numerical/computational textbook for more information. *** Discussion of the results shall at least include: (1) the description of relationship between Ρ and u; (2) suggestion on how to reduce noise; (3) laws/precautions in pre-empt noise pollution.

Note: 1. Include a maximum 300 words of abstract at the Cover Page.

2. Include at least your MATLAB coding in your appendix. Codes will be tested and re-run during evaluation. The shorter the codes, the better the codes.

3. You may use any software such as ANSYS or COMSOL OR use analytical solutions to validate/check your computed results.

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Assignment: Acoustics and Noise Control (Jan-Apr 2017)

Format of the report: 1. Font style: Times News Roman 2. Font size: 12 3. Line spacing: 1.5 4. Line alignment: Justify 5. No "tab" or space at the beginning of every paragraph 6. Heading: See examples 1.0 Introduction to Engineering Acoustics and Urban Design xxxxxxxx xxxxxxxx 1.1 AAA xxxxxxxx xxxxxxxx 2.0 Methodology and Explicit Solution xxxxxxxx xxxxxxxx 7. Tables and Figures: See examples

Table 1: The relationship between A and B A

B

0.254

7.523

1.569

8.578

Figure 1: v-velocity profile along horizontal centerline by SIMPLE algorithm 4

Assignment: Acoustics and Noise Control (Jan-Apr 2017)

Note: Space one line before and after every figure or/and table. The figure(s) must be clear to be seen.

8. Equations: See examples đ?œ•2 đ?‘˘ đ?œ•đ?‘Ą 2

đ?œ•2 đ?‘˘

đ?œ•2 đ?‘˘

= đ?‘? 2 (đ?œ•đ?‘Ľ 2 + đ?œ•đ?‘Ś 2 )

(1)

Note: No need to space one line after an equation.

9. Page margin: Default Microsoft Word Margin (2.54 cm all around) 10. Citation/reference format: See examples REFERENCES (Chicago Style) [1]

Chen, Shiyi, and Gary D. Doolen. "Lattice Boltzmann method for fluid flows."Annual review of fluid mechanics 30, no. 1 (1998): 329-364.

[2]

Bejan, Adrian. Convection heat transfer. John wiley& sons, 2013.

[3]

Tamura, I., Y. Tomota, and M. Ozawa. "Strength and ductility of Fe-Ni-C alloys composed of austenite and martensite with various strengths." In Proc. Conf. on Microstructure and Design of Alloys, Institute of Metals and Iron and Steel Institute, London. 1973, 1,(129): 611-615. 1973.

ALL THE BEST!

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