Search

The immersed tunnel works of Hongkong-Zhuhai-Macao Bridge was completed in 2018, a joint research team on submerged floating tunnel (SFT) was established for CCCC Hongkong-Zhuhai-Macao Bridge island & tunnel project to propose and design a overall basin test of tethered type SFT. The prototype length of 1.2 km long, with a scale of 1:50. After rounds of discussions on test significance, technical feasibility and details, the 1st generation basin test was initiated in early 2019. A special SFT basin was built in Tianjin and a test model was fabricated in a Dalian laboratory. In this paper, we introduced the general test design scheme and its evolution, critical issues encountered, and improvements for 2nd generation test. Main discussions or findings at works were: 1) the overall SFT basin test should be divided by three stages for mechanism, parameters and engineering respectively, in which the basin test is preferably divided by 3 stages targeted at trial, structural behavior, and validation; 2) a supporting system was required to ensure efficiency and quality; 3) model residual buoyancy simulation alternatives were proposed and compared; 4) attention shall be paid to the risk of SFT model damaging from artificially imposed regular waves. [ABSTRACT FROM AUTHOR]

An abstract of the article "Concept design of an innovative ultra-deep water oil production device" by Huang Yi and colleagues is presented.

Through the study on drawing behavior and habit of designers, the paper gave a sketch understanding method which combined stroke semantic feature and geometric feature. The paper's purpose was to build a hand-drawn interface system for concept design personnel in the creative development research. According to conceptual sketching process, the paper extracted strokes types, and analyzed the semantic features. By the concept definition of "bending threshold" and "pressure strength threshold", it used threshold detection to determine the strokes types, which could be used into rough stages. The results made different stages, different types of stroke function effectively classified and auxiliary recognized. The designers could choose the way between drafting interface and understanding interface by man-machine interactive function in the sketching process. The test result shows that this kind of method not only can get a hand-drawn effect, but also shall not prevent the designer's creative thinking process and can meet the personalized drawing habit. [ABSTRACT FROM AUTHOR]

A procedure of forward concept design of car body for frontal crash is proposed. First of all, topology optimization is conducted on the original styling surface of a car to get a better topology structure, with its effectiveness quickly verified by a simplified beam element model built. Then size optimization is performed for quasi-static loading conditions, and the initial dimensions of the main components of car body are obtained as the basis of frontal crash simulation. Finally, with a rectangular thin-walled straight beam as the objective of study, crashworthiness concept design for frontal impact is carried out with an equivalent beam element model. As a result, the preliminary dimension of car body is determined as the base of detailed structural design. The results show that the procedure is feasible and easy to implement, being able to lay a foundation for car body to achieve all expected performances. [ABSTRACT FROM AUTHOR]