In propeller cavitation pulsation pressure testing, the stability of cavitation significantly affects the time domain characteristics of the induced pulsation pressure. This stability also determines the accuracy of predicted cavitation pulsation pressure. Three processing methods are compared: ordinary FFT (Fast Fourier Transform); averaging the signal in the time domain before Fourier transform (Time-domain averaged FFT); averaging the signal in the frequency domain after Fourier transform (Frequency-domain averaged FFT). The calculations were conducted to analyze the pulse pressure signals induced by stable and unstable vacuoles. The results indicate that the Time-domain averaged FFT and the Frequency-domain averaged FFT can eliminate the interference of random factors and produce consistent prediction results when compared to the direct FFT method. However, the Time-domain averaged FFT method is not applicable for unstable cavitation. In that case, the Frequency-domain averaged FFT method can more accurately predict the pulse pressure amplitude.

The AnyLogic simulation platform is used to study the operation of shipping industry and find the way of achieving higher efficiency and lower operating costs. A complex shipping network simulation model is constructed by combining ABM (Agent-Based Model) and DES (Discrete Event Simulation) methods. Ship’s departure, navigation, loading and unloading at the port, and fuel filling are modeled. Simulation experiments reveal that transportation costs and impacts of environmental factors can be significantly reduced by optimizing speed and fuel strategies. The simulation model can be used to simulate and respond to market fluctuations and emergencies, and improve the emergency response ability and market adaptability of shipping companies.

A source-storage cooperative control strategy is developed to address the power distribution and operation stability problem caused by equipment grid-tie/off-grid operation in marine DC power systems and to ensure the stable operation of the power system under various operating conditions. A mathematical model is built based on MATLAB/Simulink. The mathematical model runs in real time on the RT-LAB simulation platform. The control strategy is verified in multiple working conditions through online parameter adjustment function. The simulation results show that the proposed source-storage control strategy can effectively improve the power distribution efficiency and operation stability of the Marine DC power system, and ensure the stable operation of the power system under various working conditions.

In order to enhance the stability of lithium battery packs operating in parallel on a ship’s DC power grid, the system is mathematically modeled and the control algorithm is developed. A Simulink model of parallel “Energy Storage-DC/DC-DC Bus.” is built to simulate different output characteristics of energy storage modules. An improved current equalization control algorithm based on voltage-current dual-loop control is devised. The algorithm calculates the mean square deviation of voltage-current simulation data and analyzes the current equalization accuracy. Experimental results demonstrate that this strategy effectively improves the voltage stability of the ship’s DC bus, reduces current imbalance, and enhances overall system performance and safety.

In the context of carbon emission reduction, to respond the regulatory requirements for carbon emissions from operating ships, a mathematical model of carbon emissions for operating ships is established. The operation of a container ship is studied based on the operational data of the container ship. The carbon intensity and economics of feasible emission reduction measures are analyzed. The result shows that in the short term, the carbon intensity rating limit for the next ten years can be met by speed management and existing emission reduction technologies, but overuse of speed reduction will go against the operating costs. In the medium to long term, the use of biofuel blends and improving fleet management may be the solution to meet the carbon intensity requirements for existing ships over their operating cycles.

The provision of Ships Entry and Departure issued by China Port authority requires a ship to report its entry/departure plan in specified time. In order to detect ships who fail to follow the regulations a technical solution is devised. The streaming data processing engine Apache Flink is used to check ships’ berthing/unberthing operation against the ships’ reporting data and find the ships who did not report its plan in specified time. An alarm will be announced if such a ship is found. The design has been used in a maritime information platform and worked well.

In response to the enterprise managements’ eagerness for accurate, rigorous, fast financial monthly reports and efficiently submit them , a financial fast monthly report submission platform based on SAP BW (SAP Business Warehouse) is developed. The existing problems in the issuance, adjustment, and submission of reports are analyzed and the overall framework, design ideas, and solutions for report presentation and the submission platform of the reports are elaborated. The application of the design proves that the financial quick monthly report solution based on SAP BW can not only meet the accuracy of financial statements, but also balance the rigor and speed of report submission. It also has good operability and promotability.

In order to prevent major safety risks in the operation of the Xupu Bridge and improve the level of structural safety assurance, it is proposed to establish a Xupu Bridge structural health monitoring system. The sensors as the basic data source for entire system are to be deployed according to the structural characteristics of Xupu Bridge. The sensor layout is carefully optimized to achieve all-weather and all-round understanding of the bridge operating environment and structural conditions, ultimately ensuring the safe and reliable operation of the bridge structure throughout its entire design life cycle.

Environmental supervision during the construction of a new quay berth project plays an irreplaceable role for reducing and avoiding environmental damage, which is beneficial to the sustainable economic development and environment of the region around the site. The practical environmental supervision work during the construction of 5# and 6# Berths in Shihu Operating District of Quanzhou Portis is presented. The environmental supervision work was guided by the experiences gained in a number of environmental supervision projects. According to the specific situation of the project and the characteristics of the environment the supervision, beside typical environment protection monitoring tasks, paid special attention to things, such as dust prevention and control, marine ecological monitoring, caring of aquatic species enhancement and releasing.

In response to the need of systematic research on carbon emission management approaches for enterprises,this paper reviews the current situation and future development trend of carbon emission management in several key industries such as shipping industry, power industry, steel industry and aviation industry. The critical problems of existing carbon emission management in these enterprises are analyzed. 7 key critical problems limiting the efficient carbon emission management are identified. Top-level planning, data standardization system and carbon emission factor accounting are considered the most important 3 of them. 8 key things for carbon emission management are brought out. They cover developing strategy and roadmap for low-carbon transformation, improving carbon emission factor accounting system, developing low-carbon technology, and establishing carbon information publication management mechanism.