GB/T 19887-2005
ActiveAcoustics-Measurement of the in situ sound attenuation of a removable screen
声学 可移动屏障声衰减的现场测量
📚 References & Relations / 引用与关联
normative_reference
GB/T 15173-1994
normative_reference
GB/T 17181-
normative_reference
GB/T 3241-1998
normative_reference
GB/T 3785-1983
normative_reference
IEC 60804
normative_reference
IEC 60942
normative_reference
IEC 61260
📖 Terms & Definitions / 术语和定义 ai_extracted
- 可移动屏障r
- emovable screen 在无需改变其他环境条件下可拆卸的屏障
- 实际声源actual
- sound sources 有待屏蔽的声源。
- 声压级L,
- sound pressur e level 声压与基准声压之比的10为底的对数乘以20,单位dB,基准声压为20 t}Pa.
- A计权声压级L,
- A-weighted sound pressure l evel 按GB/T 3785-1983的A计权网络测得的声压级,A计权声压级用dB表示。 3 6 无屏障声压级Lo, unscr eened sound pressur e l evel 在拟建屏障的位置上尚未加屏障来屏蔽声源时,在某一测量位置上测得的声压级。无屏障声压级 用dB表示。
- 有屏障声压级L,z
- screened sound pressur e level 在3. 6所叙的拟建屏障的位置上加上屏障后于同一测点位置测得的声压级,屏障声压级用dB 表示。
- 现场声衰减D,
- in situ sound attenuation 在3. 6定义的特定位置处用1/3倍频带或倍频带测定的L 与L>2之差值,用dB表示。
- A计权现场声衰减D,
- A-weighted in situ sound attenuation 当用实际声源时,在3. 6规定的位置处测得的几Al与此同时Lynn之差值,用dB表示。 3. 10 指向性指数DI; directivity index L-(一个围绕声源的水平圆周上平均分布的12个测点声压级的能量平均值)与岛,02个测点中 第,个测点处的声压级)之差值,用dB表示。 其圆周半径应近似为1.
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Content extracted by AI. Not officially verified.