Modelling set-crane noise with sea

摘要

In this paper it will be shown how a statistical energy analysis (SEA) model can be used, together with relatively small scale measurements, to determine the sound power emitted by a large industrial construction. The technique is particularly useful when full scale measurements are not possible or too demanding.This investigation was part of a project that aimed to reduce the sound immission around the harbour of Amsterdam. It was found that a 35 tonnes gantry crane, used for the unloading of ships, was one of the dominant sources of sound (see figure 1). For the purpose of finding the efficiency of possible ways for reducing the sound emission a detailed investigation into the sound production of the crane was set up. Some of the sound sources (e.g. electric engines and cooling fans) could be examined by direct measurement of the noise emission. However, a nonconventional method for determining the sound radiated by the construction had to be used since the crane, which is over 100 m long and 30 m high and consists of several distinct segments, had limited accessibility during operational hours, while taking the crane out of production for an extended period of time would have been too expensive. Moreover, a direct measurement of the sound immission was not possible because of the large number of other sound sources in the vicinity of the crane.