Prediction of coupled pitch-heave based on grey dynamic MGM(1,n) model;

Calculation of pitching and heaving of a catamaran;

The experimental methods and process are introduced in this paper for a catamaran rolling and pitching in regular waves, as well as the determination of some parameters of motion.

Simulation of heaving and pitching motion of fast boat with hydrofoils;

High-efficient flap type rudders with 45°dip angle are installed in order to control the course, rolling and pitching simultaneously.

The seakeeping performance of a 30 000 kN ferry has been studied by means of model tests, which gives the maximum angles of rolling and pitching, maximum heaving amplitude as well as the heaving acceleration on the gravity center.

The bridging construction technology at the condition of large longitudinal slope and falling slope

From site selection,type selection,longitudinal slope setting and other aspects the design of culvert is elaborated,in order to ensure design quality of mountain highway and reduce engineering cost.

Taking cement concrete pavement structure as object of research,the 3-D finite element is used to analyze variation of stress upon pavement structure under standard axle load under different longitudinal slope conditions.

The casting yard design of steep longitudinal gradient small radius bridgehead connection

So the relationship between longitudinal gradient,grade length limit,vertical curve and safety is analyzed,which can be referred to improve the safety and optimize the profile design.