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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 34877.3-2017 |
Industrial fans—Determination of fan sound power levels under standardized laboratory conditions—Part3:enveloping surface methods 工业风机 标准实验室条件下风机声功率级的测定 第3部分：包络面法 |
China National Standards enveloping |
 English PDF |
| GB/T 3768-2017 |
Acoustics—Determination of sound power levels and sound energy levels of noise sources using sound pressure—Survey method using an enveloping measurement surface over a reflecting plane 声学 声压法测定噪声源声功率级和声能量级 采用反射面上方包络测量面的简易法 |
China National Standards enveloping |
English PDF |
| GB/T 16444-2008 |
Planar double-enveloping worm gearing reducer 平面二次包络环面蜗杆减速器 |
China National Standards enveloping |
English PDF |
| GB/T 2820.10-2002 |
Reciprocating internal combustion engine driven alternating current generating sets--Part 10:Measurement of airborne noise by the enveloping surface method 往复式内燃机驱动的交流发电机组 第10部分:噪声的测量(包面法) |
China National Standards enveloping |
English PDF |
| GB/T 16848-1997 |
Accuracy of double enveloping worm gearing withstraight line generatrix 直廓环面蜗杆、蜗轮精度 |
China National Standards enveloping |
English PDF |
| GB/T 16445-1996 |
Planar double-enveloping worm gearing accuracy 平面二次包络环面蜗杆传动精度 |
China National Standards enveloping |
English PDF |
| GB/T 16443-1996 |
Planar double-enveloping worm gearing geometrical data symbols 平面二次包络环面蜗杆传动几何要素代号 |
China National Standards enveloping |
English PDF |
| GB/T 16442-1996 |
Planar double-enveloping worm gearing terminology 平面二次包络环面蜗杆传动术语 |
China National Standards enveloping |
English PDF |
| GB/T 3768-1996 |
Acoustics--Determination of sound power levels of noise sources using sound pressure--Survey method using an enveloping measurement surface over a reflecting plane 声学 声压法测定噪声源声功率级 反射面上方采用包络测量表面的简易法 |
China National Standards enveloping |
English PDF |
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