?!DOCTYPE html> 【众旺环境检】_噪声?/title> <link href="http://www.1001seafoods.com/skin/lh6147/101.css" rel="stylesheet" type="text/css" /> <script type='text/javascript' src='http://file.hedaweb.com/skin/lh6147/js/jquery.min.js?v=1'></script> <script type='text/javascript' src='http://file.hedaweb.com/skin/lh6147/js/lanrentuku.js?v=1'></script> <script type='text/javascript' src='http://file.hedaweb.com/skin/lh6147/js/jquery.SuperSlide.2.1.1.js?v=1'></script> <script type="text/javascript" src="http://file.hedaweb.com/libs/jquery/2.1.4/jquery.min.js"></script> <script type='text/javascript' src='http://file.hedaweb.com/skin/lh6147/js/jqthumb.min.js?v=1'></script> <script type="text/javascript" src="http://file.hedaweb.com/javascript/changedevice.js?site=1"></script> <script type="text/javascript"> $(function(){ $('.apply img').jqthumb({ width: 270, height: 270, after: function(imgObj){ imgObj.css('opacity', 0).animate({opacity: 1},1000); } }); }); </script> <meta http-equiv="Cache-Control" 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medium;">噪声标准</span></p> <p style="text-align: left;"><span style="font-size: medium;">      噪声标准是徏立在奈奎斯特QNyquistQ定理基上的Q即处于温度为T的热q状态下的电阻,׃电子不规则的热运动而生的热噪壎ͼ其噪声功率ؓ P=kTB    式中k为L兹曼常敎ͼ1Q?8×10J/kQT为电L处的物理温度为测试系l的频带宽度QHzQP为电阻输出的噪声功率QW。当B一定时Q温度T与噪声功率P有确定的关系Q从而可取T为噪声量值的计量单位UCؓ噪声温度。噪声标准是选用电阻性元件或吸收材料做成波导型(或同轴线Q终端负载,q置于一恒定温度的加热炉Q或冷却室)中,当负载体满l对黑体条gӞ则根据普朗克黑体辐射定律Q沿传输U辐出单一模式的电LQ其单位频带辐射的功率ؓ N=kT    负蝲温度T不同Q可分ؓ标准高温、标准低温和标准室温三种噪声源。高于室温的噪声标准UCؓ标准高温噪声源;T低于室温的噪声标准称为标准低温噪声源QT{于或接q于室温的噪声标准称为标准室温噪声源。标准高温噪声源׃操作和维护都较麻烦,?宜作为国家计量标准?  </span></p> <p style="text-align: left;"><span style="font-size: medium;"> </span></p> <p style="text-align: left;"><span style="font-size: medium;">噪声?/span></p> <p style="text-align: left;"><span style="font-size: medium;">    1Q简易现场检? 易现场检,常用普通声U计Q也叫噪韌Q检设备的噪音。现场检时Q首先估设备尺寸,然后定点的位|? 设被的讑֤最大尺ؓDQ其试点的位置如下Q?DQ?cxQ测试点设备表面ؓ30厘米?D—1cxQ测试点设备表面ؓ1c?DQ?cxQ测试点设备表面ؓ3c? 一般设备,要?个测试点Q大型设备测6个点? 试高度一般ؓQ小讑֤备高度的2Q?处;中设备ؓ讑֤高度?Q?处;大设备ؓ讑֤高度?Q?处? 对于风机、压~机、水c轮装|等可参考日本JIS标准Q?一般来_试环境要求有时不易满Q这时测试仅起到估计作用?  </span></p> <p style="text-align: left;"><span style="font-size: medium;"> </span></p> <p style="text-align: left;"><span style="font-size: medium;">    2QISOq场试? 在用此法时Q应注意以下几点Q? Q?Q在q面内画出整备的包络Uѝ? Q?Q环境近D由场Q也是几乎没有反射Q测点距d加一倍,噪声降低6分贝?Q?Q测量高度要求在讑֤高度?/2~1/3处?   Q?Q测点的距离Q要保证盔R点的声压U差不超q?分贝?   Q?Q测量值的计算要求Q当各测点的最大g最g差不过5分贝Ӟ只需求算术^均|当最大g最g差超q?分贝Ӟ则要用能量^均的Ҏ计算?   噪声ȝ   噪声对h体的危害是全w性的Q既可以引v听觉pȝ的变化,也可以对非听觉系l生媄响。这些媄响的早期主要是生理性改变,长期接触比较强烈的噪壎ͼ可以引v病理性改变。此外,作业场所中的噪声q可以干扰语a交流Q媄响工作效率,甚至引v意外事故?  噪声对听觉器官的影响是一个从生理U行至病理的q程Q造成病理性听力损伤必达C定的强度和接触时间。长期接触较强烈的噪声引起听觉器官损伤的变化一般是从暂时性听阈位U逐渐发展为永久性听阈位UR?   你可以打110报警?Ҏ中华人民共和国治安管理处|法的有兌定,如果他的行ؓ实影响C或是周围的h可以责o他关闭印象音响或是减音? 减小噪音原则Q一?声源处减?二、传播过E中减弱 三、接收处减弱  ҎQ?、密闭声源,在声源处建造隔声墙Q防止噪声直接向外传播?、加强绿化,在繁杂的公\两旁植树造林QŞ成屏障? 3、给ȝ隔音设施? 4。给机器上润滑油,即防止生噪韻I又能保护机器? 5、在x处加塞隔韌|,如好的耛_? 如何睡得好,可采取以下几个方面措施? ①闭目入静法。上床之后,先合上双|然后把眼睛微微张开一条缝Q保持与外界有些接触Q虽Ӟ_zd仍在q作Q然而,交感经zd的张力已大大下降Q诱gh体渐渐进入睡意蒙胧状态? ②鸣天鼓法。上床后QԒ卧闭目,左掌掩左耻Ix掩右耻I用指头弹d脑勺Q之听到呼呼的响声。弹ȝơ数到自觉微累ؓ止。停止弹dQ头慢慢靠近睡枕Q两后自然安放于w之两侧Q便会很快入睡了?/span></p></p> <p class="page"> <span>上一:</span> <script type="text/javascript" src="http://www.zhongwang.hk6.ejion.net/include/nextpage.aspx?type=1&channelid=101&classid=10003&id=5"></script> <span>下一:</span> <script type="text/javascript" src="http://www.zhongwang.hk6.ejion.net/include/nextpage.aspx?type=2&channelid=101&classid=10003&id=5"></script> </p> </div> </div> </div> </div> <div class="footer"> <div class="footer_box"> <div class="L"> Copyright 天|众旺环境有限公?All Rights Reserved.<br /> 专业?a href="http://www.1001seafoods.com/">天|噪声?/a>,<a href="http://www.1001seafoods.com/">天|水质?/a>,<a href="http://www.1001seafoods.com/">天|环境监测</a>公司,联系电话Q?22-28759229<br /> </div> <!--<div class="R"> <img 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