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1、军械工程学院本科毕业论文摘要随着近代工业的发展,噪声污染也随着增强,已经成为对人类的一大危害。噪声大小通常用分贝来表示,一般说话的声音为40分贝至60分贝,当噪声超过80分贝时就有可能对人体的健康状况造成伤害。科学家研究显示,当噪音在80-85分贝时,人往往很易激动、感觉疲劳,头痛多在前额区;在95-120分贝时,人们的头常常局部性阵痛,并伴有易激动、睡眠失调、头晕、记忆力减退等生理性病变。噪音增强到140-150分贝时不但引起耳病,而且发生恐惧和全身神经系统紧张性增高。处于这种环境下人体健康将会遭受极大的伤害。因此,公共场所须安装噪声实时检测系统时刻给人们以警示。本设计采用单片
2、机8031作为控制核心。通过借助敏感元件传声器,对外界噪声信号进行检测和信号变换,转换成相应的音频信号,经过LM324集成运算放大电路将输出的微弱的音频信号放大,并由高性能的电压频率转换集成电路LM331构成的V/F转换电路,将电压信(0~5V)转换成对应的频率信号(0~10KHz),该频率信号以TTL电平送入8031单片机进行处理,并转换成相应的DB值通过LED显示,从而实现噪声的实时监测。其实现简单,精确度高,可用于实际进行噪声的事实监测。关键词传声器;单片机;运算放大器;V/F转换器;噪声检测XXXI军械工程学院本科毕业论文AbstractWithmodernindustr
3、ialdevelopment,noisepollutionhasincreasedashasbecomeamajorofhumanharm.Noisesizeisusuallyusedtoexpressdecibels,thegeneralsaidthevoicefor40to60db,whenmorethan80dbnoisewhenthebodyislikelytocauseharmthehealthstatus.Scientists,wheninthe80-85decibelnoise,peopleareoftenveryeasilyexcitedandfeelfatigu
4、e,headacheandmoreofthetemporalareainthe95-120decibels,theformerheadoftenbluntpain,accompaniedbyeasilyagitated.Sleepdisorders,dizziness,memorydecline;increaseto140-150decibelsofnoise,notonlyfromeardisease,butalsoinfearandgeneralincreaseoftensioninthenervoussystem.Inthisenvironmenttohumanhealth
5、willsuffergreatharm.Therefore,publicplacesneedtoinstallnoise-detectionsystemtoalertpeopletothemoment.ThisdesignadoptsSCM8031bywayofcontrollingcore.Throughthehelpofsensitivecomponentsmicrophone,theoutsidenoisesignaldetectionandsignalconversion,convertedintothecorrespondingaudiosignals,theLM324
6、IntegratedOperationalamplifieroutputoftheweakaudiosignalamplification,andthefrequencyofthevoltageconversionofhigh-performanceintegratedcircuitsLM331constituteTheV/Fconversioncircuit,thevoltageletter(0~5V)convertedintothecorrespondingfrequencysignals(0~10KHz),thefrequencysignalstoTTLlevelintot
7、he8031microcontrollerprocessingandconvertedintothecorrespondingvalueofDBThroughtheLEDdisplay,thusrealizingthereal-timemonitoringofnoise.Thiswayissimple,highprecision,soitisalwaysusedinmonitoringtheurbannoise.KeyWordsMicrophone,operational,amp