Vibration control of offshore structures using deep learning prediction methods

Abstract

The structures have been built throughout history to meet many needs and contribute to the development of humanity. While some structures were built to accommodate people, some were built to fulfill people's work activities and allow activities in cultural, sports, and similar areas. Many activities can be done to develop humanity, thanks to the structures whose purpose of usage can change according to the region where they are built. The use of natural resources such as oil and natural gas has increased, especially in recent times in human history. In line with this development, natural resources were first extracted from the land. With the natural resources extracted from the land, the needs of the people have been met, and it has been seen that the living standards have increased over time. However, due to the increase in demand for natural resources over time, humanity needed to conduct research at points that it had not discovered before. In the early days, research was done at points close to the coast in line with the possibilities. Various structures were built in the regions where natural resources were found, and the resources obtained from there were started to be used. As time progresses, it has been determined that the opportunities have increased, and as a result, there are resources at deeper points than the coastal region, such as the ocean and sea. In order to obtain the resources identified in the open seas, structures called offshore structures were built. Examples of the increase in these opportunities are the development of technological, technical, and workforce development. Offshore structures can be defined under three subsections. These are fixed platforms, compliant platforms, and floating platforms. With the use of these structures, natural resources such as natural gas and oil obtained from the region where they are used are produced, stored, and offloaded according to the usage functions of the offshore platforms. In addition, drilling studies can be carried out to determine natural resources. In this way, it is seen that the natural resources necessary for human life and development can be provided sectorally. Since offshore structures are important for their intended use, it is extremely critical to use the necessary technical information while designing and analyzing them. In addition, the structure must meet the conditions expected from it throughout its usage period. However, unlike the structures built on land, it is seen that the points to be considered while designing and constructing are different because they are exposed to different environmental conditions. Unlike structures on land, the wave is exposed to current force and glacial load. In addition, it is highly important to consider this factor when designing, since the previously mentioned harmonious and floating structures, unlike fixed structures, have a different connection with the ground in the region they are located. Under these conditions, it is observed that vibration occurs in the offshore structure. Earthquake load, dead load, wind load and the loads formed as a result of the work done on the structure also affect the formation of vibration. Vibration in offshore structures prevents the structure from standing in balance. As a result of the deterioration of the balance, it becomes difficult for the structure to fulfill its usage function by displacement. Unlike the intended use, the safety and comfort of the people working in the structure may also be adversely affected due to the displacement that occurs as a result of vibration. Considering the studies in the literature in line with the reasons mentioned, it has been seen that various methods have been developed to control the vibration that occurs in offshore structures. Researches have shown that the vibration can be controlled by developing different systems according to the loading conditions. According to the results obtained, it has been seen that vibration control provides benefits both in terms of economy and safety. By controlling the vibration that occurs in the structure, possible damage will be prevented, and the usage function of the structure can be continued without any problems. In addition, it is seen that safety and working comfort are protected in line with the measures taken, and the approaches developed.