Industry application of digital twin: from concept to implementation

A systematic review of digital twin about physical entities, virtual models, twin data, and applications

Digital twin for ship life-cycle: A critical systematic review

The high-quality development of the marine economy has become a realistic choice to stimulate the vitality of regional economic growth and achieve the goal of building a powerful nation in the marine economy. This study constructs an evaluation index system from efficiency, coordination, innovation, sustainability, openness, and shareability to analyze the high-quality development level and temporal-spatial heterogeneity of China’s regional marine economy from 2010 to 2018. Methods used in this paper are entropy, kernel density estimation, and partial spatial autocorrelation analysis. The results are shown as follows: (1) The high-quality development level of China’s regional marine economy shows a slow fluctuating and upward trend, coordination, sustainability, and innovation are the primary driving forces. The ranking of the three marine economic circles in the development quality of the marine economy is Eastern> Southern>Northern, the ranking of coastal provinces is Guangdong> Shanghai> Shandong> Zhejiang> Fujian> Tianjin> Jiangsu> Liaoning> Hainan> Hebei> Guangxi. The primary driving forces for Guangdong, Shanghai, Shandong, and Zhejiang leading other coastal areas are openness, efficiency, innovation, and sustainability respectively; (2) the temporal differentiation of China’s regional marine economy shows a dynamic evolution process that is obvious in the early stages, alleviating in the middle stage, and balance in the later stage; (3) the spatial zoning types and high-quality development paths of 11 coastal provinces are determined based on spatial differentiation: Shanghai and Zhejiang are high-value congregate types and named as demonstration regions, which should build global marine center cities with deepening regional cooperation and high-standard opening-up; Shandong and Guangdong are high-value discrete types and named as key engine regions, which should enhance the international competitiveness of the marine industry with scientific and technological innovation; Tianjin, Hebei, and Liaoning are low-value congregate types and named as potential zooming regions, which should improve the efficiency of marine resources utilization with regional cooperation; Jiangsu, Fujian, Hainan, and Guangxi are low-value discrete types and named as land-sea coordination regions, which should build a modern and characteristic marine industrial system coordinated with land and sea.

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Evaluation and Temporal-Spatial Deconstruction for High-Quality Development of Regional Marine Economy: A Case Study of China

The invention discloses a load picking and placing machine for a battery clamp, which is used for picking and placing a clamp on an upper clamp machine and a formation cabinet. The load picking and placing machine for the battery clamp comprises a rack, a control system arranged on the rack, as well as a lifting mechanism, a carrying board and at least one picking and placing mechanism, wherein the lifting mechanism is arranged on the rack; the carrying board is arranged on the rack in a sliding manner up and down; the lifting mechanism drives the carrying board to rise or drop; the picking and placing mechanism is supported on the carrying board and provided with a horizontally sliding mechanical arm, and drives the mechanical arm to stretch and draw horizontally; the mechanical arm drives the clamp to move horizontally; and both the lifting mechanism and the picking and placing mechanism are electrically connected with the control system. The load picking and placing machine for the battery clamp can pick and place the clamp automatically, facilitates the automation of the battery production process, and improves the production efficiency.

Load picking and placing machine for battery clamp

Fatigue crack growth prediction method for offshore platform based on digital twin

The marine economy has always occupied an important position in China’s economic development. It is not only an important element of the national economy but also the primary economic form in coastal areas. In recent years, China’s economy has been growing at a rapid pace, and the marine economy’s share of GDP has expanded as well. However, it is undeniable that the sustainable development of marine economy is also confronted with unprecedented challenges, such as sea pollution and the degradation of coastal ecosystem, etc. This article aims to prevent the predatory growth of the marine economy, to promote sustainable development, and to achieve the coordination and unity between marine economy and marine ecology, culture, resources and technology. This study explores the internal motivation of the sustainable evolution of marine economy and develops a new indicator system using data from 11 coastal areas in China from 2008 to 2018. The level of sustainability of the marine economy in China's coastal areas is evaluated using a combination of entropy and the improved topsis method. Results show that technological innovation driving has gradually replaced the resource-invested growth model. From 2008 to 2018, the sustainability of marine economic development in China's coastal areas showed a stratified trend, with obvious differences between different regions. Among them, the sustainability of Guangzhou was as high as 0.445, the development efficiency of Tianjin and Shanghai was higher, and the total marine economy of Zhejiang and Jiangsu was high but the sustainability was weak. Finally, we discussed the causes that contribute to regional disparities and offered recommendations. 

The internal dynamics and regional differences of China's marine economic evolution based on comprehensive evaluation

The invention discloses a method for cleaning mud cakes of the inner wall of a drilling rod and a cleaning device used by the method The cleaning device comprises a reciprocating pump, high-pressure hoses, a water adaptor, a winch, a fixed pulley and a high-pressure jet-flow cleaning tool, wherein the high-pressure jet-flow cleaning tool is connected with one high-pressure hose, the high-pressure jet-flow cleaning tool is delivered to a to-be-cleaned position in the drilling rod through the winch, the reciprocating pump is used for delivering circular medium, namely, drilling sludge into the high-pressure jet-flow cleaning tool through the high-pressure hoses, and cleaning media jetting at a high speed out of a nozzle on the side wall of the high-pressure jet-flow cleaning tool can clean the mud cakes of the inner wall of the drilling rod In the process, the reciprocating pump is used for providing required power for cleaning the inner wall of the drilling rod, and the winch leads the high-pressure jet-flow cleaning tool to ascend or descend in the drilling rod through the high-pressure hoses, so that the inner wall of the whole drilling rod is cleaned The method can effectively solve the problems that an extractor cannot be thrown into the drilling rod and an inner pipe assembly cannot be extracted from a drilling hole due to scaling of the inner wall of the drilling rod and during wire line coring, so that cleaning efficiency and cleanliness are high

Method for cleaning mud cakes of inner wall of drilling rod and cleaning device used by method

The utility model discloses a rock sample moving and carrying device of a drilling machine, which is composed of a movable base, a lifting mechanism and a rock sample clamping device, wherein the movable base is composed of a universal wheel, a supporting leg frame, a supporting base and a portal frame. A rock sample can be moved and conveyed from the inside of a rock sample box with a narrower inner wall to the ground or from the ground to the inside of the rock sample box in clamping and lifting ways, so that the safety of workers in the operation process is improved; the traditional hydraulic power station of the drilling machine is used as a driving source, hydraulic control is adopted, operators can carry out clamping and lifting operations on the rock sample moving and carrying device on an operating platform, and the rock sample moving and carrying device is only needed to move under the actions of pushing and pulling along the universal wheel, so that the problems of labor waste, low efficiency and no safety caused by carrying by means of manpower are solved; and the clamping device is provided with a sleeve which is telescopic in the horizontal direction and the longitudinal direction and a telescopic link assembly so that the rock sample moving and carrying range is widened, the problem of clamping rock samples with fixed sizes is solved, and the reliability and the applicability of a drilling machine experiment are improved.

Rock sample moving and carrying device of drilling machine

In order to improve the availability of solar energy, this paper introduces a new solar energy storage device and its parameters automatic measuring system. The device puts the heat which was gathered by synchronous tracking solar collector into underground concrete storage pile. Meanwhile, the system could simultaneously measure the temperature, pressure and flow of the device, etc. Some derived parameters such as thermal energy storage and thermal storage effectiveness can be obtained by calculation. According to the experimental results, the device is able to store the solar energy for seasons in the underground, and automatic measuring system could display the parameters and real-time curves on monitor and draw the history curves of all parameters. The data base of parameters could be built during the energy storage process. Furthermore, the energy storage report can be generated to obtain an automatic and digital energy storage process.

Xin Fang

Papers

Fatigue crack growth prediction method for offshore platform based on digital twin

The internal dynamics and regional differences of China's marine economic evolution based on comprehensive evaluation

Method for cleaning mud cakes of inner wall of drilling rod and cleaning device used by method

Rock sample moving and carrying device of drilling machine

Research on Solar Energy Underground Seasonal Storage Device and Its Parameters Measuring System