افت انتقال صوت پوسته‌های مخروطی ناقص با مواد متخلخل

نوع مقاله : مقاله پژوهشی

نویسندگان

1 خواجه نصیر*مهندسی مکانیک

2 دانشکده مهندسی مکانیک، دانشگاه صنعتی خواجه نصیر الدین طوسی، تهران، ایران

چکیده

یک مدل تئوری به منظور مطالعه افت انتقال صوت در یک پوسته مخروطی ناقص با لایه متخلخل معرفی می‌شود. پوسته مخروطی همسانگرد و جدار نازک است و به وسیله یک موج صوتی صفحه‌ای که به‌صورت مایل به سطح بیرونی آن برخورد می‌کند، تحریک می‌شود. از تئوری لاو جهت پیاده‌سازی معادله‌های حرکت پوسته مخروطی استفاده می‌شود، و با استفاده از یک روش حل همگرا بر پایه سری‌های توانی، پاسخ دینامیکی پوسته به‌صورت دقیق محاسبه می‌گردد. همچنین جهت مدل‌سازی انتشار موج در ماده متخلخل، از روش سیال معادل بر پایه تئوری بایو بهره گرفته می‌شود. در ابتدا، نتایج مدل حاضر با نتایج مطالعه‌های گذشته اعتبارسنجی می‌گردد. سپس، اثرات چندین پارامتر مهم طراحی همچون شرایط مرزی مختلف در دو سر پوسته مخروطی، زاویه رأس مخروط، زاویه موج صوتی برخوردی و جنس پوسته بر ویژگی‌های افت انتقال صوت این نوع سازه بررسی می‌گردد. نشان داده می‌شود مدل حاضر می‌تواند به عنوان یک ابزار موثر در مرحله طراحی صوتی پوسته‌های مخروطی ناقص به‌کار گرفته شود. به علاوه، افت انتقال صوت در حضور لایه‌ای از ماده متخلخل که در دو ساختار متفاوت به جداره پوسته متصل شده است، محاسبه می‌گردد. نتایج به‌طور کلی عملکرد مطلوب لایه متخلخل را در زمینه عایق‌بندی صوتی سازه نشان می‌دهد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Sound Transmission Loss of Truncated Conical Shells with Porous Materials

نویسندگان [English]

  • ali asghar jafari 1
  • Masoud Golzari 2
2 Faculty of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, Iran
چکیده [English]

A theoretical model is proposed to study the sound transmission loss of a truncated conical shell with a porous layer. The isotropic thin-walled conical shell is excited by an oblique incident plane sound wave, which impinges on the outer surface of the shell. The governing equations of the shell motion are obtained by Love’s theory, and a convergent power series solution is applied to obtain the exact displacements of the shell. An equivalent fluid model based on Biot’s theory is considered to describe the wave propagation in the porous material. The model results are firstly validated against the results of prior studies. Then, the effects of several design parameters such as different boundary conditions at the ends of the shell, cone angle, incident sound wave angle and material properties of the shell are studied on the characteristics of the sound transmission loss. The proposed model can provide an effective tool in the acoustic design stage of the truncated conical shells. In addition, the transmission loss is obtained in the presence of the porous layer with two different configurations. The results generally show the desirable performance of the porous layer in the sound insulation ability.
 

کلیدواژه‌ها [English]

  • Sound Transmission Loss
  • Truncated conical shell
  • Porous materials
  • Plane sound wave
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