The company’s vibration and noise analysis：1.Active noise cancellation technology, namely noise source reduction technology, is implemented by equipment selection and optimization of installation procedure; 2. Passive noise cancellation technology, namely, it is realized through the research and development of vibration isolation and noise reduction technology of superstructure. When the experimental ship or vessel and other large and medium-sized military auxiliary ship is in the missions at sea, it has such functions as communications for surveying and mapping, as well as the sea research, so the lower the noise from the ship itself is, the clearer feedback signal for collecting information from ocean is. On the other hand, if the ships noise surpassed the requirements, it is unable to complete the corresponding ocean information collection task, even, severe situation can directly lead to failure of task. In the process of ship construction, vibration reduction and noise reduction control technology is mainly adopted to reduce the noise of ship navigation and meet the requirements of noise index, so as to achieve the main mission of experimental ship or surveying vessel.
The company has mastered the vibration and noise reduction control technology by tackling key problems and studying, coupled with formed a complete set of guidance documents and procedures for the implementation of vibration and noise cancellation. Therefore，the noise index of the ship can be controlled well. The main technical features are as follows: 1. 3D modeling to encrypt value points is used to make hull lines smoother and resistance smaller. 2. The vibration noise analysis is carried out to improve the structural strength of stress concentration points. 3. The equipment installation and pipeline layout for noise reduction design is guided. 4. Noise reduction can be achieved by improving internal installation and laying damping materials in key parts. 5. It is developed to the guiding technology of vibration and noise cancellation. 6. The on-site fine vibration reduction and noise reduction management mechanism is implemented.
At present, this technology is not only successfully adopted in all types of ships with noise index requirements, but also has realized its value in the company’s series of Marine engineering ships, reaching the common technical requirements of military and civilian use. It is one of the important technologies for our company to build military ships. The 636 ocean comprehensive surveying vessel built by our company is known as “ocean black hole” by foreign websites, because its most outstanding performance is silence, even more than many anti-submarine ships. It is published a paper for this technology, the company applied for the “cabin noise analysis and noise cancellation technology research” tech item.