動平衡機在zai實shi際ji使shi用yong中zhong會hui遇yu到dao各ge種zhong幹gan憂you，其qi中zhong有you電dian氣qi幹gan擾rao和he機ji械xie振zhen動dong幹gan擾rao。電dian氣qi幹gan擾rao一yi般ban有you工gong頻pin幹gan擾rao和he尖jian峰feng脈mai衝chong幹gan擾rao
，而er機ji械xie幹gan擾rao包bao含han了le各ge種zhong雜za散san振zhen動dong幹gan擾rao。例li如ru皮pi帶dai輪lun傳chuan動dong、軸zhou承cheng和he安an裝zhuang基ji座zuo等deng各ge種zhong振zhen動dong源yuan的de幹gan擾rao，這zhe些xie比bi前qian者zhe更geng為wei嚴yan重zhong，也ye更geng難nan於yu消xiao除chu。測ce振zhen傳chuan感gan器qi的de輸shu出chu不bu僅jin有you不bu平ping衡heng量liang引yin起qi的de基ji頻pin振zhen動dong信xin號hao，還hai含han有you各ge種zhong頻pin率lv成cheng分fen的de幹gan擾rao信xin號hao，使shi得de測ce取qu信xin號hao的de信xin噪zao比bi大da大da降jiang低di
，給gei信xin號hao分fen析xi與yu識shi別bie帶dai來lai困kun難nan，其qi結jie果guo直zhi接jie影ying響xiang到dao動平衡檢測的精度。可以看出不平衡量的有用信號（30g）完全淹沒在噪聲中。因此怎樣從大量的幹擾信號中提取出有用的不平衡信號
，並保證良好的相位特性，成為保證動平衡機精度的關鍵所在。

信號分析與處理是測試的重要組織部分。通常可以在時間域
、pinlvyuhefuzhiyudengbutongdeyuzhongduixinhaojinxingfenxihechuli，bingtongguoshujuhuoboxingfanyingchuyouyongdexinxi，shuzixinhaodefenxihechulishidangqiandezhuliuhequshi。pufenxizaixiandaiceshijishuzhongzhanyoutuchudediwei，keyiyouxiaodejiejuexuduogongchengzhongdewenti。
　　xinhaodepinpushiduiceshijieguojinxingfenxijitiquweiruoxinhaodezhongyaoshouduan，suoyiyanjiuzhouqixinhaohefeizhouqixinhaodepinpushihenzhongyaode。xinhaopinpudechuxianweirenleirenshikeguanshijiekaipileyigexindelingyu，xuduoguoqunanyirenqingdedongtaixianxiangjingguopinpufenxijiukeyishifenqingchu。liru，duiduozhouxuanzhuanjixiezhenyuandefenxi，xuanzhuanjixiemeigenzhuanzhoudezhuansuni一定時，因其本身動不平衡所引起的振動頻率就是確定的（f＝ni／60Hz），yigejiqiyouxuduozhuanzhou
，jiqishangzongdezhendongshiyougezhuanzhouyinqidezhendongdiejiaerchengde
，keyitongguoduizongzhendongxinhaozuopinpufenxi，genjupinpuquxianshangjianfengsuoduiyingdepinlvzhi，xunzhaoyuzhixiangduiyingdezhuanzhoupinlv
，zheyangjiukeyiquedingnaxiezhoushiyinqizhendongdegenyuansuozai，congercaiqucuoshihuojianxiaozhendong。
　　因此首先對傳感器采定哪些軸是引起振動信號進行頻譜分析，主要采用傅立葉變換的方法來獲得信號頻率特性。