I. Software overview

COMPASS Inland 2019 is a piece of professional computation software for ships independently developed by CCS and it currently includes the following four subsystems to implement hull (body and cabin) modeling as well as hydrostatics, cabin capacity, integrity stability, allowable gravity center height, damage stability, tilt test, total longitudinal strength (combination of total longitudinal bending and long hatch bending and torsion), tonnage, EEDI, and other computation and verification functions:

1) Three-dimensional hull modeling

The modeling method of the hull (body and cabin) is upgraded from the traditional offset table method to 3D modeling in a step-wise way "shape line > shape surface > main hull > cabin" as is conventional in the shipbuilding industry, so as to describe the hull and cabin accurately and support 3D hull modeling of any shape, including bulbous bow, multiple stern, convex deck, raised deck, bow thrust, bottom tunnel, etc., suitable for modeling asymmetrical catamarans, combined hulls and other special complex ship types.

The 3D visualized interaction ability: the software supports graphic picking, feature point capturing, reverse box selection (any part of graphic object is selected when it falls within the box) and undo/redo, which further improves the convenience and intuitiveness of modeling.

Providing command flow for fast modeling: this function is suitable for skillful and advanced users to realize one-click modeling from scratch, especially for fast modeling of the whole ship and modification of master mold ship.

Compatible with the conventional offset table: molded lines can be created from the offset table, which is convenient for users who prefer using the offset table to realize rapid modeling and migrating master mold ship data; The offset table can also be output from the 3D hull, which is convenient for the user to check the consistency between the model and the real data of ship. In particular, the ship drawing inspecting institutions speak highly of this function.

Supporting reference expression modeling and linkage modification: it is able to use an expression to represent a coordinate point or its coordinate components, for example, #10+100 represents the longitudinal X coordinate of rib #10 offset by 100mm, S1/Z=1 represents the point with Z value of 1 on station line S1, and S1/W1 represents the intersection of station line S1 and waterline W1; Users do not have to memorize or input numerous coordinate values for modeling, thus greatly simplifies data input and ensures the coordinate consistency of curves in different directions at intersections. When the curve (referenced line) in the reference expression is modified, the associated curve will also update by linkage, as shown in the following figure.

Support for parameterized rapid modeling of simple cabin: A 3D cabin is intercepted at the hull by specifying X positions at both ends of cabin and feature points at end faces. As shown in the following figure, this modeling approach is completely consistent with the human way of thinking and thus easy to use, especially suitable for simple cabins such as starboard cabin and bilge cabin.

Boolean assembly modeling of complex cabin: complex cabins are generated by body-to-body (cabins) Boolean assembly, as shown in the following figure of a stern located fuel tank. This modeling method accords with people's visual cognition and can describe complex cabins intuitively and accurately just like assembling toy building blocks.

In addition, general interfaces such as IGES are provided to realize model intercommunication with other software, so that users can make full use of existing data models to improve work efficiency, including the use of this software's models in other software or to use other software's models in this software.

2) Stability computation and calibration

The software realizes computation of hydrostatics, tank capacity curve, complete stability, allowable gravity center height, damage stability and tilt test, which are used for auxiliary design and drawing review of inland waterway and river-sea intermodal ships, and are applicable to all ship types listed in the Technical Rules for Statutory Survey of Inland Waterway Vessels (2011 Edition, 2015 Revision Circular, 2016 Revision Circular, 2018 Revision Circular, 2019 Edition) and the Technical Rules for Statutory Survey of River-Sea Intermodal Ships on Specific Routes (2018), including dry cargo ships, liquid cargo ships, passenger ships, container ships, self-discharging sand ships, dredgers, crane ships, barges, bulk carriers, commercial automobile RORO (Roll on Roll off) vessels.

In addition, compared with the conventional slice integration algorithm, our new independently developed 3D algorithm not only improves the computation accuracy, but also gets rid of the limitation of hull shape, and can be applied to 3D hulls of any shape, such as spherical bow, multi-stern, stem-to-stern elevation, convex deck, multi-body, floating dock, combined hull, etc.

3) Calculation of total longitudinal strength

The thin-walled equal-straight finite beam method is adopted to calculate and check the total longitudinal bending of hull beams and the combined bending and torsion strength of ships with long and large openings. The method is applicable to the ship types listed in the Code for Construction of Steel Inland Waterway Ships (2016 and 2019 Revision Circular) and the Code for Construction of River-Sea Intermodal Ships on Specific Routes (2018).

In addition, seamless connections with the stability module is realized by taking hull loads obtained from stability computation as input, thus avoiding repeated input of shared data such as weight, center of gravity and simplifying computational workload.

4) Licensing computation and evaluation

The software realizes computation and evaluation of the technical indexes as per applicable codes and regulations required for issuing certificates, such as gross tonnage, net tonnage and EEDI. It is applicable to the ships listed in the Technical Rules for Statutory Survey of Inland Waterway Vessels (2011 Edition, 2015 Revision Circular, 2016 Revision Circular, 2018 Revision Circular, 2019 Edition) and the Code for Inland Waterway Green Ships (2018). In particular, it supports accurate computation with the 3D hull model as input.

II. Suitable customers and benefits

The software is suitable for ship design organizations, ship building and repairing organizations, ship survey organizations, maritime organizations, universities, and research institutes. The customers can obtain the following benefits and rights:

Accurate and reliable computation of stability, total longitudinal strength, etc., viewing in graphic and table forms, and one-click export of reports;

Collaboration between designer and surveyor, which can greatly shorten the overall cycle and improve work efficiency;

Standardization of the same hull model according to multiple different versions of specifications, for example, "tracing" of old ships according to the new standard;

Ability to run independently without relying on any other application software, real-time technical support through QQ group, mail, telephone and other means.

As of June 2020, the software has been applied in more than 300 organizations across the country, including CSSC No. 708, No. 702, and No. 701 Institutes, Wuchang Shipbuilding Industry Group, Guangzhou Shipyard International Company, SDARI, Yangtze River Ship Design Institute, Wuhan University of Technology and other well-known organizations, where it is widely used in ship aided design, drawing inspection, safety assessment, standardized scientific research, teaching and training, etc. Geographically, the users cover 23 provinces and municipalities including Guangdong, Guangxi, Chongqing, Hubei, Hunan, Anhui, Jiangsu, Shanghai, Zhejiang, Fujian, Jiangxi, and Heilongjiang, with ships navigating the Yangtze River, Pearl River, Heilongjiang, Beijing-Hangzhou Canal and other water systems.

Compared with the old version of the software before 2016, the 2019 version has advantages in terms of ease of use, data sharing, and model interoperability:

1) Hull modeling has been upgraded from 2D to 3D and provided with multi-level modeling tools, including pickup and capture, command flow, reference expressions, modification linkage, model value table, IGES interface, etc., which greatly improves the modeling intuitiveness, convenience, accuracy, ship model adaptability and model interoperability.

(2) The computation function breaks through the hull shape constraints, solves the problem of ship type adaptability, and improves the accuracy of computation.

(3) A seamless connection is realized through stability, strength and other related modules, and intelligent assistance provides professional computation parameters input; all those functions, along with data checking, greatly reduce human factor errors and eliminate repeated data entry, making the software more user-friendly and efficient.

4) It eliminates the shortcomings of only supporting current standards, integrates the computation calibration for different periods selected, and simplifies software management. It is fully adaptive to the differentiated needs of the industry as to the traceability of old ships.

III. Customer service 

This software adopts a licensing system.

Technical support: Chen Zhibiao  zbchen@ccs.org.cn 0086-27-85423516

        Chen Qingren  qrchen@ccs.org.cn  0086-27-85865132

Marketing work: Cheng Shiyao  sycheng@ccs.org.cn 0086-27-85825842

Online classroom:https://ke.qq.com/course/2273767?taid=8894039753667047&tuin=f5b1c2

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