ﺑﺮرﺳﯽ ﺿﺮﯾﺐ ﺟﺬب ﺻﺪا در ﻧﺎﻧﻮﮐﺎﻣﭙﻮزﯾﺖ ﻫﺎي آﻟﻮﻣﯿﻨﯿﻮم

The study of sound absorption coefficient of aluminiumnanocomposites

ﻣﻘﺪﻣﻪ: ﺻﺪا ﯾﮑﯽ از ﻣﻬﻤﺘﺮﯾﻦ ﻋﻮاﻣﻞ زﯾﺎن آور ﻣﺤﯿﻂ ﮐﺎر و ﻓﺮاﮔﯿﺮﺗﺮﯾﻦ ﻋﺎﻣﻞ ﻓﯿﺰﯾﮑﯽ ﺗﻬﺪﯾﺪ ﮐﻨﻨﺪه ﺳﻼﻣﺖ ﺷﺎﻏﻠﯿﻦ اﺳﺖ. ﺗﻘﺮﯾﺒﺎ ﯾﮑﯽ از ﺑﻬﺘﺮﯾﻦ راه ﻫﺎ ﺑﺮاي ﮐﻨﺘﺮل ﺻﺪا، ﺟﺎذب ﻫﺎي ﺻﻮﺗﯽ ﻣﯽ ﺑﺎﺷﺪ. ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ورود ﮔﺴﺘﺮده ﻧﺎﻧﻮ در ﻋﺮﺻﻪ ﻫﺎي ﻣﺨﺘﻠﻒ ﻋﻠﻤﯽ، ﯾﮑﯽ از ﮐﺎرﺑﺮدﻫﺎي آن ﻃﺮاﺣﯽ و ﺳﺎﺧﺖ ﺟﺎذب ﻫﺎي ﺻﻮﺗﯽ ﺣﺎوي ﻧﺎﻧﻮذرات ﻣﯽ ﺑﺎﺷﺪ. ﺑﻨﺎﺑﺮاﯾﻦ ﻫﺪف از اﯾﻦ ﻣﻄﺎﻟﻌﻪ ﺗﻌﯿﯿﻦ ﺿﺮﯾﺐ ﺟﺬب در ﻧﺎﻧﻮﮐﺎﻣﭙﻮزﯾﺖ ﻫﺎي آﻟﻮﻣﯿﻨﯿﻮم ﺣﺎوي درﺻﺪﻫﺎي ﻣﺨﺘﻠﻒ ﻧﺎﻧﻮذرات آﻟﻮﻣﯿﻨﯿﻮم ﻣﯽ ﺑﺎﺷﺪ. روش ﺑﺮرﺳﯽ: ﻧﺨﺴﺖ ﻧﺎﻧﻮذرات آﻟﻮﻣﯿﻨﯿﻮم100 ﻧﺎﻧﻮﻣﺘﺮي، ﺑﺮاده ﭼﻮب و ﭼﺴﺐ ﭘﻠﯽ وﯾﻨﯿﻞ اﺳﺘﺎت ﺑﻪ ﻧﺴﺒﺖ ﻣﺸﺨﺼﯽ وزن ﺳﻨﺠﯽ ﺷﺪ و ﺑﻪ ﺧﻮﺑﯽ ﻣﺨﻠﻮط ﮔﺮدﯾﺪ. در ﻣﺮﺣﻠﻪ ﺑﻌﺪ ﻣﺨﻠﻮط ﺑﺪﺳﺖ آﻣﺪه درون ﻗﺎﻟﺐ ﻣﻘﺎوم ﺑﻪ ﺣﺮارت رﯾﺨﺘﻪ و در دﻣﺎي 37 درجه ﺳﺎﻧﺘﯽ ﮔﺮاد ﺧﺸﮏ ﮔﺮدﯾﺪ. ﺑﻌﺪ از ﺗﻬﯿﻪ ﻧﺎﻧﻮﮐﺎﻣﭙﻮزﯾﺖ ﻫﺎي ﻣﺬﮐﻮر، ﺿﺮﯾﺐ ﺟﺬب ﺻﻮت ﺑﺎ ﻟﻮﻟﻪ اﻣﭙﺪاﻧﺲ ﺻﻮﺗﯽ ﻗﺮاﺋﺖ ﺷﺪ. ﻧﺘﺎﯾﺞ: ﻣﻘﺎﯾﺴﻪ ﺿﺮﯾﺐ ﺟﺬب ﺻﺪا ﭼﻬﺎر درﺻﺪ وزﻧﯽ(3 ،2 ،1 و 4 درﺻﺪ ﻧﺎﻧﻮذرات 100 ﻧﺎﻧﻮﻣﺘﺮي) ﻧﺎﻧﻮﮐﺎﻣﭙﻮزﯾﺖ ﻫﺎي آﻟﻮﻣﯿﻨﯿم ﻧﺸﺎن داد ﮐﻪ ﻧﺎﻧﻮﮐﺎﻣﭙﻮزﯾﺖ آﻟﻮﻣﯿﻨﯿﻮم در ﻓﺮﮐﺎﻧﺲ 2000 ﻫﺮﺗﺰ و در درﺻﺪ وزﻧﯽ ﭼﻬﺎرم، ﺑﺎﻻﺗﺮﯾﻦ ﺿﺮﯾﺐ ﺟﺬب ﺻﺪا را داﺷﺖ. اﯾﻦ در ﺣﺎﻟﯽ اﺳﺖ ﮐﻪ در ﻫﻤﻪ درﺻﺪﻫﺎي وزﻧﯽ ﻧﺎﻧﻮﮐﺎﻣﭙﻮزﯾﺖ ﻫﺎي آﻟﻮﻣﯿﻨﯿﻮم در ﻓﺮﮐﺎﻧﺲ500 ﻫﺮﺗﺰ ﭘﺎﯾﯿﻦ ﺗﺮﯾﻦ ﺿﺮﯾﺐ ﺟﺬب ﺻﻮت دﯾﺪه ﺷﺪ. ﻧﺘﯿﺠﻪ ﮔﯿﺮي: ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد ﺑﺎ اﻓﺰاﯾﺶ درﺻﺪ وزﻧﯽ ﻧﺎﻧﻮذرات آﻟﻮﻣﯿﻨﯿﻮم ﺿﺮﯾﺐ ﺟﺬب ﺻﻮت ﺑﯿﺸﺘﺮ ﻣﯽ ﺷﻮد و ﻧﺎﻧﻮﮐﺎﻣﭙﻮزﯾﺖ ﻫﺎي آﻟﻮﻣﯿﻨﯿﻮم ﻣﯽ ﺗﻮاﻧﻨﺪ ﮔﺰﯾﻨﻪ ﻣﻨﺎﺳﺒﯽ ﺑﺮاي ﮐﺎﻫﺶ ﻧﻮﯾﺰﻫﺎي ﻣﺤﯿﻄﯽ و ﺻﻨﻌﺘﯽ ﺑﺎﺷﻨﺪ.

Sound is one of the most important work-related risk factors and most widespread physical factors threatening the health of workers. Almost one of the best ways to control the sound is sound absorber. Due to the extensive entrance nano in various fields of science one their applications design and use sound-absorbing panels containing nanoparticles.The aim of this study to determine the sound absorption coefficient of nanocomposites, containing aluminum nanoparticles at different percentages. Method: This study had an experimental – Laboratory procedure. First of aluminum particles (100 nm), wood chips and glue polyvinyl acetate weight was measured the ratio of identified and wellmixed. In the next step, the obtainedmixtureis pouredinto the moldHeat resistant and transferred to 37 ° C. After the preparation ofmentionednanocompositesthen sound absorption coefficient values were determined by acoustic impedance tube at four frequencies, 250, 500, 1000 and 2000 Hz. Results: The Comparison between the sound absorption coefficient of four weight percentage (1, 2, 3 and 4% of 100nm-aluminum nanoparticles) of aluminum indicated that the aluminum nanocomposite had the highest sound absorption coefficient of weight percentage 4% at frequencyof 2000 HZ. While theallweight percentagesaluminumnanocomposites was seen the lowest sound absorptioncoefficient at frequency of 500 Hz. Conclusion: The results showed that the increasing of the percentage of aluminum nanoparticles led to increase of sound absorption coefficient and aluminum nanocomposite can be a good choice to reduce environmental and industrial noise.