{"id":398506,"date":"2024-12-26T08:36:45","date_gmt":"2024-12-26T08:36:45","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/verification-for-impedance-boundary-calculations\/"},"modified":"2024-12-26T08:36:45","modified_gmt":"2024-12-26T08:36:45","slug":"verification-for-impedance-boundary-calculations","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/verification-for-impedance-boundary-calculations\/","title":{"rendered":"Verification for impedance boundary Calculations"},"content":{"rendered":"<p>&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;text-align: justify; text-justify: inter-ideograph;&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221;&gt;A noise analysis is to be conducted within the engine room of a small craft, where the air inside the engine room is modeled using solid elements for a purely acoustic analysis. Given that the room is enclosed by steel, an impedance boundary condition is applied to all exposed surfaces. In order to define an impedance boundary in ANSYS, both resistive and reactive components are required. However, there are no suitable resources available to calculate these components. The calculations we have conducted are based on the fundamental principles of acoustic theory. Could you kindly verify and correct them?&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;text-align: justify; text-justify: inter-ideograph;&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221;&gt;Also, guide on &#8221; How can I verify and validate the results of my acoustic analysis? Are there any resources available to help perform hand calculations?&#8221;&lt;\/span&gt;&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;text-align: justify; text-justify: inter-ideograph;&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221;&gt;&nbsp;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/12\/26-12-2024-1735193854-mceclip0.png\" \/>&lt;\/span&gt;&lt;\/p&gt;&lt;table class=&#8221;MsoNormalTable&#8221; style=&#8221;margin-left: 3.9pt; border-collapse: collapse; mso-table-layout-alt: fixed; mso-yfti-tbllook: 1184; mso-padding-alt: 0cm 5.4pt 0cm 5.4pt;&#8221; border=&#8221;0&#8243; cellspacing=&#8221;0&#8243; cellpadding=&#8221;0&#8243;&gt;&lt;tbody&gt;&lt;tr style=&#8221;mso-yfti-irow: 0; mso-yfti-firstrow: yes; height: 10.1pt;&#8221;&gt;&lt;td style=&#8221;width: 122.0pt; padding: 0cm 5.4pt 0cm 5.4pt; height: 10.1pt;&#8221; valign=&#8221;top&#8221; width=&#8221;163&#8243;&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;strong style=&#8221;mso-bidi-font-weight: normal;&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; 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style=&#8221;text-align: right;&#8221; align=&#8221;right&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-size: 11.0pt; mso-bidi-font-size: 12.0pt; color: black;&#8221;&gt;&nbsp;&lt;\/span&gt;&lt;\/p&gt;&lt;\/td&gt;&lt;td style=&#8221;width: 59.5pt; padding: 0cm 5.4pt 0cm 5.4pt; height: 10.1pt;&#8221; valign=&#8221;top&#8221; width=&#8221;79&#8243;&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;text-align: right;&#8221; align=&#8221;right&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-size: 11.0pt; mso-bidi-font-size: 12.0pt; font-family: SimSun; mso-fareast-font-family: DengXian; mso-fareast-theme-font: minor-fareast; color: black;&#8221;&gt;&nbsp;&lt;\/span&gt;&lt;\/p&gt;&lt;\/td&gt;&lt;\/tr&gt;&lt;tr style=&#8221;mso-yfti-irow: 8; height: 10.6pt;&#8221;&gt;&lt;td style=&#8221;width: 122.0pt; border: solid windowtext 1.0pt; border-top: none; mso-border-top-alt: solid windowtext .75pt; mso-border-alt: solid windowtext .75pt; mso-border-left-alt: solid windowtext .5pt; 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border-right: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext .75pt; mso-border-left-alt: solid windowtext .75pt; mso-border-alt: solid windowtext .75pt; padding: 0cm 5.4pt 0cm 5.4pt; height: 10.6pt;&#8221; valign=&#8221;top&#8221; width=&#8221;121&#8243;&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;text-align: right;&#8221; align=&#8221;right&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-size: 11.0pt; mso-bidi-font-size: 12.0pt; color: black;&#8221;&gt;7750&lt;\/span&gt;&lt;\/p&gt;&lt;\/td&gt;&lt;td style=&#8221;width: 58.2pt; border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext .75pt; mso-border-left-alt: solid windowtext .75pt; mso-border-alt: solid windowtext .75pt; padding: 0cm 5.4pt 0cm 5.4pt; height: 10.6pt;&#8221; valign=&#8221;top&#8221; width=&#8221;78&#8243;&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-size: 11.0pt; mso-bidi-font-size: 12.0pt; color: black;&#8221;&gt;kg\/m3&lt;\/span&gt;&lt;\/p&gt;&lt;\/td&gt;&lt;td style=&#8221;width: 59.5pt; padding: 0cm 5.4pt 0cm 5.4pt; height: 10.6pt;&#8221; valign=&#8221;top&#8221; width=&#8221;79&#8243;&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;text-align: right;&#8221; align=&#8221;right&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-size: 11.0pt; mso-bidi-font-size: 12.0pt; font-family: SimSun; mso-fareast-font-family: DengXian; mso-fareast-theme-font: minor-fareast; color: black;&#8221;&gt;&nbsp;&lt;\/span&gt;&lt;\/p&gt;&lt;\/td&gt;&lt;\/tr&gt;&lt;tr style=&#8221;mso-yfti-irow: 9; height: 14.05pt;&#8221;&gt;&lt;td style=&#8221;width: 122.0pt; border: solid windowtext 1.0pt; border-top: none; mso-border-top-alt: solid windowtext .75pt; mso-border-alt: solid windowtext .75pt; mso-border-left-alt: solid windowtext .5pt; padding: 0cm 5.4pt 0cm 5.4pt; height: 14.05pt;&#8221; valign=&#8221;top&#8221; width=&#8221;163&#8243;&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-size: 11.0pt; mso-bidi-font-size: 12.0pt; color: black;&#8221;&gt;Speed of sound in steel&lt;\/span&gt;&lt;\/p&gt;&lt;\/td&gt;&lt;td style=&#8221;width: 69.8pt; border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext .75pt; mso-border-left-alt: solid windowtext .75pt; mso-border-alt: solid windowtext .75pt; padding: 0cm 5.4pt 0cm 5.4pt; height: 14.05pt;&#8221; valign=&#8221;top&#8221; width=&#8221;93&#8243;&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-size: 11.0pt; mso-bidi-font-size: 12.0pt; color: black;&#8221;&gt;Cs&lt;\/span&gt;&lt;\/p&gt;&lt;\/td&gt;&lt;td style=&#8221;width: 91.0pt; border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext .75pt; mso-border-left-alt: solid windowtext .75pt; mso-border-alt: solid windowtext .75pt; 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height: 14.05pt;&#8221; valign=&#8221;top&#8221; width=&#8221;79&#8243;&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;text-align: right;&#8221; align=&#8221;right&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-size: 11.0pt; mso-bidi-font-size: 12.0pt; font-family: SimSun; mso-fareast-font-family: DengXian; mso-fareast-theme-font: minor-fareast; color: black;&#8221;&gt;&nbsp;&lt;\/span&gt;&lt;\/p&gt;&lt;\/td&gt;&lt;\/tr&gt;&lt;tr style=&#8221;mso-yfti-irow: 10; height: 13.25pt;&#8221;&gt;&lt;td style=&#8221;width: 122.0pt; border: solid windowtext 1.0pt; border-top: none; mso-border-top-alt: solid windowtext .75pt; mso-border-alt: solid windowtext .75pt; mso-border-left-alt: solid windowtext .5pt; padding: 0cm 5.4pt 0cm 5.4pt; height: 13.25pt;&#8221; valign=&#8221;top&#8221; width=&#8221;163&#8243;&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-size: 11.0pt; mso-bidi-font-size: 12.0pt; color: black;&#8221;&gt;Impedance of steel&lt;\/span&gt;&lt;\/p&gt;&lt;\/td&gt;&lt;td style=&#8221;width: 69.8pt; 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style=&#8221;text-align: right;&#8221; align=&#8221;right&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-size: 11.0pt; mso-bidi-font-size: 12.0pt; color: black;&#8221;&gt;38750000&lt;\/span&gt;&lt;\/p&gt;&lt;\/td&gt;&lt;td style=&#8221;width: 58.2pt; border-top: none; border-left: none; border-bottom: solid windowtext 1.0pt; border-right: solid windowtext 1.0pt; mso-border-top-alt: solid windowtext .75pt; mso-border-left-alt: solid windowtext .75pt; mso-border-alt: solid windowtext .75pt; padding: 0cm 5.4pt 0cm 5.4pt; height: 13.25pt;&#8221; valign=&#8221;top&#8221; width=&#8221;78&#8243;&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;&lt;span lang=&#8221;EN-US&#8221; style=&#8221;font-size: 11.0pt; mso-bidi-font-size: 12.0pt; color: black;&#8221;&gt;kg\/m2s&lt;\/span&gt;&lt;\/p&gt;&lt;\/td&gt;&lt;td style=&#8221;width: 59.5pt; padding: 0cm 5.4pt 0cm 5.4pt; height: 13.25pt;&#8221; valign=&#8221;top&#8221; width=&#8221;79&#8243;&gt;&lt;p class=&#8221;MsoNormal&#8221; style=&#8221;text-align: right;&#8221; 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