The China Classification Society (CCS) has established a system of digitization rules, to track the development of ship digitization and ensure safety.
Ship Digitization Rules System
With regard to application scenarios such as inspection, testing and verification of digital technologies on board ships and offshore installations, the digitization rules system should contain at least the following aspects:
- Digitization of ship’s equipment and systems: Propose technical requirements at several levels such as basic universality, spatial organization, virtual-real interworking and system application, for the physical entity, the digital system and the virtual space corresponding to the ship’s equipment and digitization of the system.
- Testing and verification: Establish applicable technical requirements and rules focusing on test rules, indicators and digital system cases.
- Security Guarantee: Establish specific technical requirements in various aspects such as physical security, functional security, data security, information security and network security corresponding to the guarantee of security during the procedure of digitization of ships and their system.
The digitization rules system framework should establish the relevant technical requirements at four levels:
Level 1: Clearly specify the classification range and scanning conditions for ships and offshore facilities, and specify unclassified survey and technical services.
Level 2: Clearly define the requirement for basic elements and data application capabilities for digitization of ships and offshore installations, which is the most fundamental requirement of digitization and also the technical platform on which to other rules and guidelines may rely.
Level 3: Formulate technical requirements and inspection requirements for digitization of specific ships, offshore installations and special technologies, propose detailed technical requirements and indicators for specific objects of ships and offshore installations, and use them in combination with the level 2 basic rules.
Level 4: Formulate instructive technical methods, technical requirements, and inspection requirements required by rule implementation and new service requests, and the categories of these requirements include warranty requirements, standard data requirements, and requirements data range; Prepare inspection guidelines on capability scanning and verification indicators, data application capability, and data verification for different equipment and systems.
II. Vessel Digitization Testing and Verification
Effectively evaluating the ship’s digital system to ensure ship safety is a significant challenge in the field of ship monitoring, and it requires constant and thorough research. Currently, the combination of qualitative analysis and quantitative assessment is used in testing and verification of the ship’s digital system.
First, it is a question of carrying out a quantitative analysis on the existing digital system from dimensions such as performance, functions and security, to obtain a relatively objective evaluation; quantitative analysis can improve the accuracy and precision of the numerical system.
Then, a qualitative analysis can be carried out by survey, interview and questionnaire survey to assess the digital system of the ship as a whole. On this basis, the testing and verification of the ship’s digital system can be divided into four stages:
- Build a system of evaluation indicators: Through the analysis of business expectations and embedded system capability needs, define system inputs and outputs, determine a system of evaluation indicators, and establish an embedded system capability function library.
- Generate sample simulation data: Analyze system and equipment characteristics in combination with embedded system business scenarios, derive verification elements from system design, design verification experiments, and generate experimental data samples by simulation.
- Establish a laboratory capacity model: Match the capability model used by the embedded system with simulation data samples, establish a confidence interval of the capability models, and adopt test samples for testing and verification to meet the requirements of the evaluation indicators .
- Check full scale ship data: Cut or copy in real time a certain amount of verifiable data from the embedded system, introduce it into the capacity model established in step 3; by comparing the results of the model with the evaluation indicators, determine whether the output of the capability model meets the evaluation indicators. Considering the impact of the diversity of data on the capacity model, this step must comprehensively calculate the results of the comparison between the capacity model and the evaluation indicators. Only when the degree of confidence of the model conforms to a certain confidence interval can the capability model be judged to meet business expectations and capability requirements.