Dissolved oxygen transfer in an aeration pond was studied by numerical method in this paper. 2d water pond current induced by water-wheel aerators and oxygen transfer process was simulated by finite volume method. In order to verify the relationships between current and dissolved oxygen transfer, we set 4 layout styles with 4 aerators in a water pond. It is proved that different layout styles induce different flow structures and dissolved oxygen distribution. Traditional layout (style a) is not the best way for oxygen transfer, and other styles (style b, c &d) are all superior to the traditional layout. But water flow structures are not the same results. Water circulation performance is style a, c, b, d in sequence. Style c (flow to corners along pond wall) is the best way by comprehensive consideration of both water circulation performances and dissolved oxygen distribution.

Traditional job shop scheduling running time length and complexity of large defects, the paper proposes a rule-based optimization algorithm, with the longest duration as a condition of relative rest or scheduling rules to optimize the scheduling operations. The scheduling rules to ensure that the process of the longest remaining duration is scheduled and Priority scheduling the process that has the shortest working hours while. By comparing the relative remaining duration, to solve the optimal solution for each part of the scheduling, So that the entire operation to the global optimal solution or near optimal solutions. And provide algorithms of the mathematical model, the model of algorithm, the flow chart of algorithm and the specific code of it. Practice shows that in the face of complex scheduling, this scheduling algorithm that can guarantee the computing speed, but also shorten the construction period and close to the optimal solution; in the actual project has a strong practical value.

Aimed at those accidents such as bridge collapsed, lifting containers fall off etc., based on slamming theory, combined with such practical engineering problems, simplified slamming model rationally, and carried out corresponding physical model experiment, thus obtained universal peak-pressure formula on this type slamming issues. Then take further research to validate the formula through others data, the results show that the formula has a good reference for actual engineering problems.

The paper discusses the irregular parts packing problem based on an improved immune genetic algorithm, and a NIGA based on crowing mechanism is proposed. For improving the packing efficiency, the graphics-matching algorithms and clustering algorithm in the pretreatment of the part graphics are introduced. Matching algorithm of surplus rectangle as decoding algorithm for local optimization is proposed for automatic layout. In solving the large-scale packing problem, the application of immunity operator and niche genetic algorithm based on crowing mechanism improves the global optimization performance and velocity of convergence. The algorithms are effective and feasibility for solving the packing problem in the hull construction automatic packing system.

In real sea state, Ocean energy devices to work hard to stabilize, or even destroyed. Based on Airy wave theory, Movement and force of heaving cylindrical wave-energy converter (WEC) was analyzed under the complex marine state. Then setting the South China coast as the environmental background, and simulating and computing the motion response of the buoy and the mooring system under various sea conditions. The computational data show that complex mechanical response was happened and the mooring system (SM) has excellent mooring performance. The research results have practical significance for heaving cylindrical WEC survival design under real sea conditions.