东大奥鹏2023年3月噪声与振动控制X《噪声与振动控制》在线平时作业1_100分
噪声与振动控制X《噪声与振动控制》在线平时作业11.[单选题] <img height="149" width="662" alt="" src="http://file.open.com.cn/ItemDB/88716/958b29d5-40bd-44ce-bba8-401098231a2e/20111149751130.JPG" />
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A.A
B.B
C.C
D.D
答:——A——
2.[单选题] <p><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">若声压衰减系数为</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">a</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">,介质厚度为</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><v:shapetype id="_x0000_t75" stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"> <v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:connecttype="rect" gradientshapeok="t" o:extrusionok="f"></v:path><o:lock aspectratio="t" v:ext="edit"></o:lock></v:shapetype><v:shape id="_x0000_i1025" style="WIDTH: 9.75pt; HEIGHT: 11.25pt" o:ole="" type="#_x0000_t75"><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1.MS-\LOCALS~1\Temp\msohtml1\01\clip_image001.wmz"></v:imagedata></v:shape></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">,根据声波吸收衰减规律,吸收衰减量的计算公式可表示为(</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><span style="mso-spacerun: yes"> </span></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)</span></p><p><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA"><img height="40" width="519" alt="" src="http://file.open.com.cn/ItemDB/88716/541da928-c3e5-46c1-8ef7-4c50c62300e8/2011114112210904.JPG" /></span></p>
A.A
B.B
C.C
D.D
答:——A——
3.[单选题] 有一隔声间内侧总表面积S=100m2,墙表面的吸声系数为0.02,噪声源与隔声间混凝土隔墙的面积为20m2,墙的隔声量TL=50dB,此隔声间的实际隔声量应为()dB
A.20
B.30
C.40
D.50
答:——C——
4.[单选题].某车间经消声处理后,响度级从100方,降低到80方,问车间噪声级降低了( )
A.20%
B.45%
C.75%
D.80%
答:————
5.[单选题] <img height="123" width="563" alt="" src="http://file.open.com.cn/ItemDB/88716/062dc31f-33c9-4ce8-90d7-b11d81015e74/2011114102148959.JPG" />
A.A
B.B
C.C
D.D
答:————
6.[单选题] 以下哪些量不是从客观上量度声音的( )
A.声压
B.声强
C.声功率
D.响度
答:————
7.[单选题] 隔声门按照隔声量的大小,一般分为( )级
A.2
B.3
C.4
D.5
答:————
8.[单选题] <img height="157" width="443" alt="" src="http://file.open.com.cn/ItemDB/88716/af005178-e328-4fbf-a8a8-0619473f8e06/2011114104621287.JPG" /> 南开大学答案q761296021
A.A
B.B
C.C
D.D
答:————
9.[单选题] <img alt="" src="http://file.open.com.cn/ItemDB/88716/82c4c3a7-5980-4c15-986d-53be6548e5d2/201111410047262.JPG" />
A.A
B.B
C.C
D.D
答:————
10.[单选题] 在隔声设计中,空气的透射系数为( )
A.0
B.1
C.10
D.0.2
答:————
11.[单选题] 当有人大喊一声,距离他的嘴唇30cm处,平均声压大约为5 μbar,则他喊时的声功率大约为( )W
A.0.0004
B.0.0007
C.0.0009
D. 0.001
答:————
12.[单选题] <p><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">各分声压级与总声压级的关系式,正确的是</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">( <span style="mso-spacerun: yes"></span><span style="mso-spacerun: yes"> </span>)</span></p><p><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><img height="139" width="435" alt="" src="http://file.open.com.cn/ItemDB/88716/a6fc5bfe-ae37-478a-9a97-db65d40aed8e/2011114102426667.JPG" /></span></p>
A.A
B.B
C.C
D.D
答:————
13.[单选题] <span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">若已知</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">A</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">声级为</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体">80<v:shapetype id="_x0000_t75" stroked="f" filled="f" path="m@4@5l@4@11@9@11@9@5xe" o:preferrelative="t" o:spt="75" coordsize="21600,21600"> <v:stroke joinstyle="miter"></v:stroke><v:formulas><v:f eqn="if lineDrawn pixelLineWidth 0"></v:f><v:f eqn="sum @0 1 0"></v:f><v:f eqn="sum 0 0 @1"></v:f><v:f eqn="prod @2 1 2"></v:f><v:f eqn="prod @3 21600 pixelWidth"></v:f><v:f eqn="prod @3 21600 pixelHeight"></v:f><v:f eqn="sum @0 0 1"></v:f><v:f eqn="prod @6 1 2"></v:f><v:f eqn="prod @7 21600 pixelWidth"></v:f><v:f eqn="sum @8 21600 0"></v:f><v:f eqn="prod @7 21600 pixelHeight"></v:f><v:f eqn="sum @10 21600 0"></v:f></v:formulas><v:path o:connecttype="rect" gradientshapeok="t" o:extrusionok="f"></v:path><o:lock aspectratio="t" v:ext="edit"></o:lock></v:shapetype><v:shape id="_x0000_i1025" style="WIDTH: 17.25pt; HEIGHT: 14.25pt" o:ole="" type="#_x0000_t75"><v:imagedata o:title="" src="file:///C:\DOCUME~1\ADMINI~1.MS-\LOCALS~1\Temp\msohtml1\01\clip_image001.wmz"></v:imagedata></v:shape></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">,问与其相对应的噪声评价曲线的号数是(</span><span lang="EN-US" style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-bidi-font-size: 12.0pt; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-fareast-font-family: 宋体"><span style="mso-spacerun: yes"> </span></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 宋体; mso-bidi-font-size: 12.0pt; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-font-kerning: 1.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">)</span>
A.80
B.85
C.75
D.70
答:————
14.[单选题] <img height="39" width="444" alt="" src="http://file.open.com.cn/ItemDB/88716/ab4755fc-d44c-4a54-8194-f24b08ca225f/2011114112338735.JPG" />
A.10
B.12
C..15
D.18
答:————
15.[多选题] 噪声对人的危害程度与下列哪些因素有关( )
A.噪声的强度
B.频率
C.接受时间
D.人的身体素质
答:————
16.[多选题] 根据平均听力损失判定噪声性耳聋时,采用哪些频率下的听力损失值( )
A.250Hz
B.500 Hz
C..1000 Hz
D.2000 Hz
答:————
17.[判断题] 室内稳态声场的总声能密度等于直达声的声能密度与混响声的声能密度的代数和。( )
A.错误
B.正确
答:————
18.[判断题] 室内混响声场的声能密度与声源的声功率成正比,与房间常数成反比。( )
A.错误
B.正确
答:————
19.[判断题] 声压是大气压力的变化量,随时间、地点而变化( )
A.错误
B.正确
答:————
20.[判断题] 声波为横波( )
A.错误
B.正确
答:————
21.[判断题] 介质体积弹性模量物理意义是:当介质受压变密时而使压强增加时,压强的增量(声压)与密度增量的比例关系( )
A.错误
B.正确
答:————
22.[判断题] 采用混响室法测量得出的吸声系数是垂直入射时的吸声系数。()
A.错误
B.正确
答:————
23.[判断题] 声波在钢材、水、空气中的传播速度依次递增 ( )
A.错误
B.正确
答:————
24.[判断题] 响度级不能定量比较声音,而响度可以( )
A.错误
B.正确
答:————
25.[判断题] 吸声量是吸声系数与所使用的吸声材料的面积乘积。( )
A.错误
B.正确
答:————
26.[判断题] 自由场是无边界的,内部介质是各向同性的( )
A.错误
B.正确
答:————
27.[判断题] 对于双层墙而言,声桥的存在将导致其隔声性能下降。( )
A.错误
B.正确
答:————
28.[判断题] 泡沫塑料大多数是闭孔型,主要用于保温绝热及仪器包装材料,而实际用于吸声材料的仅是少数开孔型泡沫塑料制品。()
A.错误
B.正确
答:————
29.[判断题] <img alt="" src="http://file.open.com.cn/ItemDB/88716/896b38a2-108e-4a54-896c-86a423f9d85b/201111411025330.JPG" />
A.错误
B.正确
答:————
30.[判断题] 声波从声速大的媒质中折入到声速小的媒质中时,折射线折离法线;反之,折向法线( )
A.错误
B.正确
答:————
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