Search

Copyright of Journal of Dalian University of Technology / Dalian Ligong Daxue Xuebao is the property of Journal of Dalian University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The traditional load-sensitive technology used hydraulic lines to transmit pressure signals, and the stability and response speed of the system were reduced when dealing with fluctuating external loads and complex working conditions with frequent changes. In order to solve the problem, a fuzzy control servo pump-controlled electro-hydraulic load-sensitive system was proposed. First, the fuzzy servo pump- controlled electro-hydraulic load-sensitive system was established in comparison with the traditional multi-actuator load-sensitive system, and the control principle was elaborated. Then, the mathematical model of the system was established according to the control principle, and the fuzzy PID pressure controller was designed to improve the control accuracy of the system. After that, the AMESim-MATLAB joint simulation model of the system under multi-actuator and multi-load conditions was established, and the pressure control characteristics of the system were studied and compared with the control system under traditional PID controller. Finally, a servo-pump-controlled electro-hydraulic load- sensitive test platform was built, and the test results were compared with the simulation results to draw a conclusion. The research results show that the established fuzzy control servo pump-controlled load-sensitive control system has excellent pressure control effect, and the designed fuzzy PID controller has higher control accuracy and better dynamic response characteristics compared with the traditional PID controller. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Dalian University of Technology / Dalian Ligong Daxue Xuebao is the property of Journal of Dalian University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

We systematically summarized the development of the beach protection and deposition protection methods both at home and abroad in the past 70 years, emphatically summarized the research on the mechanism of water and sediment in the offshore breakwater, submerged breakwater, nourishment beach, and the combination mode of groyne and submerged breakwater, and put forward the prospect of the new beach protection concept of submerged breakwater and beach nourishment, as well as the combination mode of groyne and submerged breakwater: Analysis and summary the critical relational expression of siltation and scour, grasp the protection regulation of submerged breakwater; find the best fit point of "feeding" and "shelter" effect, improve the effect and service life of the beach raising; discuss the influence of the scale of tidal inlet on the effect of deposition promotion of the combination of groyne and submerged breakwater; strengthen the researching and application of "inhabiting beach". [ABSTRACT FROM AUTHOR]