BS EN 61063-1996 声学.由蒸汽轮机和被驱动机器发出的气载噪音测量

标准号：BS EN 61063-1996
中文标准名称：声学.由蒸汽轮机和被驱动机器发出的气载噪音测量
英文标准名称：Acoustics - Measurement of airborne noise emitted by steam turbines and driven machinery
标准类型：Z32
发布日期：1996/7/15 12:00:00
实施日期：1996/7/15 12:00:00
中国标准分类号：Z32
国际标准分类号：17.140.20;27.040
适用范围：1 General 1.1 This International Standard applies to the measurement of airborne noise emitted by assemblies comprising steam turbines and driven machinery, hereinafter referred to as turbine sets. These sets are of all sizes without limitation of output when fitted with their normal auxiliaries. This standard applies only to the part of the turbine set (turbine, generator and attached components) located above the floor of the turbine room and in-side a continuous enveloping measurement surface bounded by this floor. An extensive and continuous turbine operating floor of a reflecting nature above the turbine foundation floor level shall be considered as the reflecting plane. 1.2 In the case of large turbine sets, the turbine operating floor is often located below and near the horizontal centreline of the turbine (see figure 1). If this floor is continuous and free from openings which would otherwise allow noise radiated below the turbine operating floor to influence the noise measured at microphone locations, a valid measure of the turbine set noise emission may be obtained by use of this standard. 1.3 In the case where the turbine operating floor is located below and near the horizontal centerline of the turbine set, but consists of: a) an open grating construction, or b) a solid floor with openings near to the boundary of the turbine set, or c) walkways typically 1 to 2 m wide of either solid or grated construction, the turbine operating floor cannot be considered as a reflecting plane. In this case the reflecting plane will be the turbine set foundation floor. In the case of the continuous enveloping measurement surface being bounded by either the turbine operating floor or the turbine foundation floor, a large contribution from the noise of ancillary and auxiliary plant iocated below the turbine operating floor may be expected at the microphone measuring positions. In this case the use of this standard for the determination of sound power levels is not valid. If this standard is to be employed for the purpose of the comparison of the 1 m sound levels of similar turbines, the turbine operating floor shall be used as the bounding surface for the continuous enveloping measurement surface. The validity of comparative measure-ments will depend on the noise present at the measurement positions due to auxiliary and ancillary plant and it will be necessary to define exactly the number, type and location of these items. It is preferable to establish the effect auxiliary and ancillary plant noise radiation will have on the sound level at the microphone locations by determining the noise emission of these items in accordance with ISO 3746, and determining the propagation of this noise to micro-phone locations. However, this procedure is beyond the scope of this standard. NOTE - When openings in the floor are suitably blocked during the test with appropriate panels (upper side of panels should have same reflective characteristics as the turbine operating floor), valid measure-ments are permitted. 1.4 In the case of turbine sets mounted on, or partially submerged in, the foundation floor, which may also be defined as the turbine operating floor, a valid measure of the turbine set noise emission may be obtained by use of this standard. 1.5 Where noise control treatments such as enclosures and/or screens are fitted to the turbine set, driven equipment and auxiliaries, the type, location and extent of treatment shall be reported. 2 Measurement uncertainty Measurements made in conformity with this standard tend to result in standard deviations which are equal to or less than those given in table 1. NOTES 1 If the method specified in this standard is used to compare the sound power levels of similar machines that are omnidirectional and radiate broad band noise, the uncertainty in this comparison tends to result in a standard deviation which is equal to or less than 3 dB provided that the measurements are perf