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<p> <span style="text-indent: 2em;">環境噪聲，是指在工業生產、建筑施工、交通運輸和社會生活中所產生的干擾周圍生活環境的聲音。</span><span style="text-indent: 2em;">環境噪聲是為保護人群健康和生存環境，對噪聲容許范圍所作的規定。制定原則，應以保護人的聽力、睡眠休息、交談思考為依據，應具有先進性、科學性和現實性。環境噪聲基本標準是環境噪聲標準的基本依據。各國大都參照國際標準化組織（ISO）推薦的基數（例如睡眠30分貝），并根據本國和地方的具體情況而制定。</span></p><p style="text-indent: 2em;"><strong>主要來源：</strong></p><p style="text-indent: 2em;">交通噪聲、<span style="text-indent: 2em;">工業噪聲、</span><span style="text-indent: 2em;">建筑施工、</span><span style="text-indent: 2em;">社會生活</span></p><p style="text-indent: 2em;"><strong>振動監測：</strong></p><p style="text-indent: 2em;">對旋轉設備而言，絕大多數故障都是與機械運動或振動相密切聯系的，振動檢測具有直接、實時和故障類型覆蓋范圍廣的特點。因此，振動檢測是針對旋轉設備的各種預測性維修技術中的核心部分，其它預測性維修技術：如紅外熱像、油液分析、電氣診斷等則是振動檢測技術的有效補充。</p><p style="text-indent: 2em;">可通過對機器或結構在工作狀態振動的下狀態監測，對機器或結構可進行故障診斷、環境控制、等級評定；測量機器或結構的受迫振動獲得被測對象的動態性能：固有頻率、阻尼、響應、模態等信息，找出薄弱環節，通過改進設計提高其抗振能力，或通過隔振處理改善機械的工作環境和性能。</p></div>
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