Applied Mechanics and Materials Vol. 703

Abstract: This paper study three mainstream operating system,their kernel module on-demand loading mechanism, their safety and reliability measures, points out the weaknesses these operating systems have in the kernel module security control. Along with the study of two new operating system -- dynamic extensible operating system and virtual address space based on file operation system, make a prospects on the operating system architecture development

Abstract: s. At present, based on the bypass method to measurement the dynamic of the high pressure side flow in hydraulic system became more and more. In order to analysis the dynamic characteristics, the bypass method measurement system flow schematic was introduced in this paper, the dynamic flow of the main oil and the system was obtained by using dynamic flow of the side oil. Meanwhile, the dynamic pressure of the main oil was obtained by using dynamic pressure of the side oil. From the results of numerical analysis indicates that it is feasible to use the bypass method to get the characteristics of the dynamic flow and dynamic pressure in the system.

Abstract: Now dispatch centers needs to do a lot of work configuration and spend a lot of time to debug to communicate with substations. This is not only time-consuming but also error prone, so the alarm information needs to be directly sent. This paper presents the design and implementation of Alarm information directly transfers system, gives the system structure and software architecture of AIDT system used in UHVDC project; getting SOE based on distributed component Ice, realizing the protocol based on finite-state machine. And combined with the actual example, this paper provides a detailed explanation of the message. The program can be running on multiple operating systems including Debian Linux, KyLinux, HPUX and so on. Successful interoperability experiments proved that this system has good consistency, and running a long time in actual project proves the stability and reliability of the system. This system not only satisfies the need of UHVDC, but also has guiding significance on the research of AIDT system in UHVDC project.

Abstract: Daqing oilfield is in high water cut stage and always appears two phenomenon called "two speeds" and "two low". Based on the geological characteristics of the block, the current exploration wells arrangement and producing dynamics, two sets programs of water injection intensity and water injection timing were designed. Through the numerical simulation prediction of the two sets of 16 programs, the optimization results are 9 injection intensity and 93% of water cut. The cumulative oil producing capacity is 1402.41×10⁴t and the cumulative increasing oil capacity is 6.26×10⁴t and the increasing value of the recovery efficiency in Secondary oil layer is 1.33% when the water cut is 98%.

Abstract: It’s one of the research difficulties of parallel mechanism because of the multi-DOF and complex solution of workspace. Workspace of the 6-UPS parallel mechanism was studied based on the envelope method. It searched the boundary of workspace by three-dimensional research method directly on the premise of satisfying the constraint conditions, which is based on the inverse kinematic. According to the multi-DOF, the orientation space was fixed to simplify the workspace parameters, and searched for the envelope surface of the position space. The relationship that the increasing orientation space leads to the reduction of the position space is reached by researching the position space under different orientation space.

Abstract: With the development of industrialization and informationization, traditional manufacturing and service industries are constantly integrating. Represented by 3D Printing Cloud Platform, the rapid prototyping technology networked manufacturing service will provide a powerful boost for Rapid Product Development of the small and medium industrial clusters. As a commercial operation platform, profitability is the driving force behind the sustainable and healthy development of 3D Printing Cloud Platform. This article analyzes the services and specific profit ways provided by 3D Printing Cloud Platform, supporting the commercial operation of the platform with important data.

Abstract: This paper designs an intelligent fuzzy PID controller of electromagnetic bearing for axial artificial heart pump (AAHP) to achieve re-stable suspension and quick response performance. and Matlab/Simulink is employed to simulate floating process of the rotor and the process of response to displacement disturbance. The simulation results show that the floating overshoot can be inhibited effectively, with the fuzzy PID controller. Fuzzy PID controller can respond to sudden displacement disturbance quickly. Then analyze the simulation waveforms of Fuzzy PID controller and traditional PID controller, verify that the fuzzy PID controller can overcome the shortcomings of traditional PID controller, and increase the control precision of the system and the robustness of the system.

Abstract: The traditional control has good performance in the control of linear systems while has poor performance in the control of nonlinear systems. The bearingless asynchronous motor is a multivariable nonlinear system with high coupling. In this paper, the method of adaptive inverse control is proposed for these reasons. Firstly, the mathematical model of the bearingless asynchronous motor is built, and the possibility of the existence of the bearingless asynchronous motor system inverse model is explored. Secondly, since the object to be controlled is highly nonlinear and has high variability. In this paper, adaptive inverse fuzzy decoupling control is used to make up the deficiency of traditional adaptive inverse control. Finally, the Matlab simulation model is established. The simulation results show that the control method has good dynamic and static performance.

Abstract: According to the strong coupling between the electromagnetic torque and radial suspension force, and the difficulty of establishing a precise mathematical model of bearingless induction motor, least squares support vector machine is proposed in this paper. The inverse model approximated by the LS-SVM is connected with the original system, decoupling a complex nonlinear multivariable system into four relatively independent pseudo-linear sub-systems of single input and single output. At the same time, fuzzy PID control strategy is introduced to the pseudo linear system to ensure the robustness and anti-jamming ability of the control system. Then the performance is simulated with Matlab/ Simulink. The theory research and simulation experiment have validated that the decoupling control of inverse system based on least squares support vector machine method can be successfully realized, which between the electromagnetic torque and radial suspension force, and the good performance of dynamic and static state of system can be also obtained.

Abstract: A bearingless induction motor is a strong coupled complex system, the decoupling control of torque and radial suspension force is the premise of the stable operation of the bearingless induction motor. In this paper, the principle of bearingless induction motor is expounded. The magnetic mathematical models of bearingless induction motor are created. The rotor field oriented control strategy is designed. The control strategy is validated with Matlab/simulink. Real-time simulation model based on dSPACE is given and the platform based on dSPACE is constructed. The results show that this method has good decoupling control performance. The actual system development and experiment process confirms that the dSPACE real-time simulation platform can shorten the development time and facilitate the development process, and save costs during the design and test period.