水下声学. 船舶水下声音描述和测量的数量和程序. 第1部分: 用于比较目的的深层水的精密测量要求

[中文适用范围]： ISO 17208 的这一部分规定了在规定操作条件下测量船舶水下噪声的通用测量系统、程序和方法。它没有规定或提供水下噪声标准的指导，也没有涉及噪声对海洋生物的潜在影响。所得量基于均方根声压级 (SPL)，此处与在船舶远场测量的声压级或 SPL 同义，并标准化为 1 米的距离，以三分之一倍频程报告（见 4.3）。在 ISO 17208 的这一部分中，这些测量的结果称为“辐射噪声级”。水下声压级测量是在几何远场进行的，然后调整到 1 米标准化距离，以便与适当的水下噪声标准进行比较。ISO 17208 的这一部分适用于任何和所有航行中的水面舰艇，无论是有人驾驶的还是无人驾驶的。它不适用于水下船只或飞机。该方法对最小或最大船舶尺寸没有固有限制。它仅限于航行速度不超过 50 节（25.7 米/秒）的船舶。该测量方法可平滑由劳氏镜面图像相干效应引起的变化，但不排除传播效应（如底部反射、折射和吸收）的可能影响。ISO 17208 的此部分未提供针对这些影响的特定计算调整。使用 ISO 17208 的此部分不需要特定的海洋位置，但提供了海洋试验场的要求。ISO 17208 此部分中描述的方法的预期用途是：显示符合合同要求或标准、将一艘船与另一艘船进行比较、进行定期签名评估以及用于研究和开发。预期用户包括政府机构、研究船运营商和商业船东。需要进行额外的后处理才能使用从此测量方法获得的数据来确定船舶源级，以执行远场噪声预测，例如大多数环境影响研究或创建水下噪声轮廓图所需的预测。 [外文原描述]： ISO 17208-1:2016 specifies the general measurement system, procedure, and methodology used for the measurement of underwater sound from ships under a prescribed operating condition. It does not specify or provide guidance on underwater noise criteria or address the potential effects of noise on marine organisms. The resulting quantities are based on the root-mean-square sound pressure levels (SPL), herein used synonymously with sound pressure level or SPL measured in the far field of the ship and normalized to a distance of 1 m and reported in one-third octave bands (see 4.3). In this part of ISO 17208, the result of these measurements is called "radiated noise level". The underwater sound pressure level measurement is performed in the geometric far field and then adjusted to the 1 m normalized distance for use in comparison with appropriate underwater noise criteria. ISO 17208-1:2016 is applicable to any and all underway surface vessels, either manned or unmanned. It is not applicable to submerged vessels or to aircraft. The method has no inherent limitation on minimum or maximum ship size. It is limited to ships transiting at speeds no greater than 50 kn (25,7 m/s). The measurement method smooths the variability caused by Lloyd's mirror surface image coherence effects, but does not exclude a possible influence of propagation effects like bottom reflections, refraction and absorption. No specific computational adjustments for these effects are provided in this part of ISO 17208. A specific ocean location is not required to use this part of ISO 17208, but the requirements for an ocean test site are provided. The intended uses of the method described in this part of ISO 17208 are: to show compliance with contract requirements or criteria, for comparison of one ship to another ship, to enable periodic signature assessments, and for research and development. The intended users include government agencies, research vessel operators, and commercial ship owners. Additional post-processing would be required to use the data obtained from this measurement method for determination of the ship source levels to perform far field noise predictions such as needed for most environmental impact studies or for creating underwater noise contour maps.