Journal of Health System Research
مجله تحقیقات نظام سلامت
J Health Syst Res
Medical Sciences
http://hsr.mui.ac.ir
1
admin
2783-4093
2322-5564
10.48305
14
8888
13
fa
jalali
1403
4
1
gregorian
2024
7
1
20
2
online
1
fulltext
fa
بررسی افت عبوری جاذب برخی از ایرمافهای رایج در فرکانس یک سوم اکتاوباند بر مبنای روش لوله امپدانس
Investigating the Absorbent Transmission Loss of Some Common Earmuffs in One-Third Octave Band Frequency Based on the Impedance Tube Method
مهندسی بهداشت حرفه ای و ایمنی کار
Occupational health engineering and occupational safety
پژوهشي
Research
<div style="text-align: justify;"><span style="font-size:11pt"><span style="line-height:115%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span sans-serif="" style="font-family:Calibri,"><b><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:">مقدمه:</span></span></span></b><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"> انتخاب گوشی حفاظتی مناسب برای کارگران در برنامه حفاظت شنوایی به عنوان آخرین راهکار معرفی شده است. پژوهش حاضر با هدف بررسی افت عبوری جاذب برخی از ایرمافهای رایج در فرکانس یک سوم اکتاوباند بر مبنای روش لوله امپدانس انجام شد</span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">.</span></span></span><b><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span style="font-family:"B Nazanin""></span></span></span></b></span></span></span></span></span><br>
<span style="font-size:11pt"><span style="line-height:115%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span sans-serif="" style="font-family:Calibri,"><b><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:">روشها:</span></span></span></b><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"> این مطالعه تحلیلی- تجربی بر روی جاذب چهار مدل ایرماف انجام گردید. ضریب افت عبوری جاذبها با استفاده از لوله امپدانس به روش تابع انتقال و بر طبق استاندارد </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">ISO 10534-2</span></span></span><span style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"> انجام گرفت. دادهها با استفاده از آزمونهای </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">Paired t</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"> و </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">ANOVA</span></span></span><span style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"> در نرمافزار </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">SPSS</span></span></span><span style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"> مورد تجزیه و تحلیل قرار گرفت.</span></span></span></span></span></span></span></span><br>
<span style="font-size:11pt"><span style="line-height:115%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span sans-serif="" style="font-family:Calibri,"><b><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:">یافتهها:</span></span></span></b><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"> بیشترین و کمترین میانگین افت عبوری اندازهگیری شده در جاذبها به ترتیب 5/27 و 3/0 دسیبل بود. اختلاف معنیداری بین میانگین افت عبوری جاذب </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">A</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"> با جاذبهای </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">B</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:">، </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">C</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"> و </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">D</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"> و جاذب </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">B</span></span></span><span style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"> با جاذبهای </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">A</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"> و </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">D</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"> در تمام فرکانسهای اندازهگیری شده وجود داشت (05/0 > </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">P</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:">). همچنین، بر اساس یافتهها، تفاوت معنیداری بین تمام فرکانسهای قبل و بعد در جاذبهای </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">A</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:">، </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">B</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"> و </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">C</span></span></span><span style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"> مشاهده گردید (05/0 > </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">P</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:">).</span></span></span></span></span></span></span></span><br>
<span style="font-size:11pt"><span style="line-height:115%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span sans-serif="" style="font-family:Calibri,"><b><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:">نتیجهگیری:</span></span></span></b><span lang="FA" style="font-size:12.0pt"><span style="line-height:115%"><span b="" nazanin="" style="font-family:"> جاذب ایرمافها در مقایسه با هم در فرکانسهای مختلف، عملکردهای متفاوتی در افت عبوری و کارایی نشان دادند. همچنین، در فرکانس پایین بیشتر ایرمافهای مورد بررسی، با افزایش فرکانس کاهش افت عبوری ایجاد شد و پس از آن در فرکانسهای 2000 هرتز به بالا روند افزایش افت عبوری مشاهده گردید که نیاز است نتایج مذکور در انتخاب گوشی حفاظتی مناسب برای کارگران در صنایع، مد نظر قرار گیرد.</span></span></span></span></span></span></span></span></div>
<div style="text-align: justify;"><span style="font-size:11pt"><span style="line-height:115%"><span style="unicode-bidi:embed"><span sans-serif="" style="font-family:Calibri,"><b><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">Background: </span></span></span></b><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">Choosing the suitable hearing protection for workers as part of the Hearing Conservation Program was introduced as a final measure. This study aimed to investigate the absorption and transmission loss of common earmuffs at one third octave band frequencies using the impedance tube method.</span></span></span></span></span></span></span><br>
<span style="font-size:11pt"><span style="line-height:115%"><span style="unicode-bidi:embed"><span sans-serif="" style="font-family:Calibri,"><b><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">Methods</span></span></span></b><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">: An analytical-experimental study was carried out on absorbers of four earmuff models. The transmission loss of the absorbers was measured using the impedance tube by the transfer function method, in accordance with the ISO 10534-2 standard. Data analysis was conducted using the paired-samples t-test and analysis of variance (ANOVA) with SPSS software.</span></span></span></span></span></span></span><br>
<span style="font-size:11pt"><span style="line-height:115%"><span style="unicode-bidi:embed"><span sans-serif="" style="font-family:Calibri,"><b><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">Findings: </span></span></span></b><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">The highest and lowest mean transmission losses measured in absorbers were 27.5 dB and 0.3 dB, respectively. The results showed a significant difference in the mean transmission loss between absorber A and absorbers B, C, and D, as well as between absorber B with absorbers A and D, across all measured frequencies (P < 0.05).<b> </b>Moreover, the results showed a significant difference in all frequencies before and after in absorbers A, B, and C (P < 0.05).</span></span></span></span></span></span></span><br>
<span style="font-size:11pt"><span style="line-height:115%"><span style="unicode-bidi:embed"><span sans-serif="" style="font-family:Calibri,"><b><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">Conclusion: </span></span></span></b><span style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">When comparing earmuff absorbers, it is evident that their performance in transmission loss and efficiency varies across different frequencies. In addition, most of the earmuffs examined in the study showed a decrease in transmission loss at low frequencies as the frequency increased. However, above2 kHz, an increasing trend in transmission loss was observed. These results need to be noted when choosing suitable hearing protection for workers in industries.</span></span></span></span></span></span></span></div>
کاهش شنوایی ناشی از سر و صدا, ایرماف, تجهیزات حفاظت فردی, تست امپدانس آکوستیک
Hearing loss, Noise induced, Earmuff, Personal protective equipment, Acoustic impedance tests
144
150
http://hsr.mui.ac.ir/browse.php?a_code=A-10-328-2&slc_lang=fa&sid=1
Farhad
Forouharmajd
فرهاد
فروهرمجد
forouhar@hlth.mui.ac.ir