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The theory frame of lash-up maintenance technology of engineering equipment is brought forward from the point of view of lash-up maintenance theory, which include fault diagnosis and survey technology, damnification evaluation theory, damnification repair technology, lash-up maintenance effect evaluation theory, lash-up maintenance support informationization technology and lash-up maintenance training technology. Content and study direction of those lash-up maintenance technologies of engineering equipment are expatiated detailedly.

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In the process of ship's ocean transportation, the monitoring of crew's work completion is a very important part in the ship safety management, and using indoor positioning technology can improve the construction of ship management system. However, the current indoor positioning technology is not ideal in the engine room environment in the face of the complex electromagnetic environment and spatial structure. In order to improve the positioning accuracy, this paper proposes a Bluetooth indoor positioning strategy for ship cabin based on hierarchical area (BSSH) for deploying and dividing the regions requiring indoor positioning and combines Bluetooth Low Energy (BLE) with Bluetooth fingerprint positioning technology. Processing the fingerprint library by using region hierarchy and proximity classification algorithms to obtain reliable results in the ship environment, the results show that better Beacon deployment and hierarchical area algorithms can lead to a localization accuracy of 80.38%.