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Two-direction MEMS impact acceleration switch

Two-direction MEMS impact acceleration switch

引用

International Conference on Intelligent Network and Intelligent Systems

作者： Liu, Shuangjie Hao, Yongping Xie, Han School of Equipment Engineering Shenyang Ligong University Shenyang China R and D Center of CAD/CAM Technology Shenyang Ligong University Shenyang China

ISBN: (纸本)9780769542492

This article summarizes research on a novel, two-direction impact acceleration switch. To sense the change of two direction impact acceleration, A MEMS impact acceleration switch with two sensitive directions was designed. In this design, four serpentine springs were used to fix and suspend the movable electrode (sensing mass). The motion of the sensing mass was investigated by theoretical analysis and finite element analysis (FEA). To investigate whether the serpentine springs' intensity was enough, the switch of the 1500g threshold acceleration in y direction and the 800g threshold acceleration in x direction was designed, simulated with CoventorWare respectively. The simulation showed that the threshold accelerations basically fulfill the expectancy. To ensure the unintentional vibration inputs would not drive the sensor mass to the fixed electrode, the mode of the switch was analyzed and its natural frequency and the corresponding mode shapes were obtained from the calculation. © 2010 IEEE.

关键词： Finite element method

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Aerodynamic characteristics analysis and study for area-changing and damp-increasing range correction system

Aerodynamic characteristics analysis and study for area-chan...

引用

25th International Symposium on Ballistics, ISB 2010

作者： Yang, Fang Hao, Yong-Ping College of Mechanical and Electric Engineering Changchun University of Science and Technology Changchun China R and D Center of CAD/CAM Technology Shenyang Ligong University Shenyang China

ISBN: (纸本)9787504656025

To improve the precision of the projectile fired, one-dimension trajectory correction device of changing damp-increasing affection depended on controlling the damper to open variable area was researched. And carried out an analysis of the change and the influence that caused by drag coefficient, lift coefficient with angle-of-attack and wind speed under different area. The mathematical model was proposed between increased drag coefficient and variable area opened by the damper. The mathematical expression of increased drag coefficient in repeated remediation was also deduced. Aiming at a certain type of projectiles, the influence of aerodynamic characteristics such as the drag, the lift, the moment, et al caused by opening variable area was researched with the theory of numerical analysis and simulation experiment. By researching aerodynamic characteristics of the projectile fixed this device would promoted the further design of damp-increasing range correction system.

关键词： Projectiles

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An oriented-service workflow access control architecture

An oriented-service workflow access control architecture

引用

International Conference on Intelligent Network and Intelligent Systems

作者： Wei, Yonghe Li, Xingshan R and D Center of CAD/CAM Technology Shenyang Ligong University Shenyang China School of Mechanical Engineering Shenyang Ligong University Shenyang China

ISBN: (纸本)9780769542492

Workflow access control is an important issue in workflow security. Although there exist some standards for security of Web services and access control for services in distributed systems are well studied, there is a lack of comprehensive approach in access control for services, especially in workflow. In this paper we proposed an access control for Service-Oriented workflow system architecture. The main secure service in the architecture and the interactions of services in running stage were described of this architecture. Adopted security services and policy-driven security approaches, this architecture can decouple security logic from applications and guarantee interoperability and manageability of systems. © 2010 IEEE.

关键词： Access control

来源：评论

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An Attribute and role based Access Control Model for Service-Oriented Environment

An Attribute and Role based Access Control Model for Service...

引用

The 22nd China Control and decision Conference(2010年中国控制与决策会议)

作者： Yonghe Wei Chunjing Shi Weiping Shao R&D Center of CAD/CAM technology Shenyang Ligong University Shenyang 110156

Based on the analysis of the access control requirements for services, this paper presents an attribute and role based access control model for services. We have described these components in detail and outlined their interactions. The proposed model introduces the notions of business role and service role, defines an automatically produces service role method based on attribute conditions to assign users to service roles, unifies the access control for web services and data resources involved. Finally, we give an access control algorithm for services. This model can provide fine-grained, supporting composite service access control and Mechanism-independent access control policy.

关键词： Access Control role Attribute and Service-Oriented Architecture

来源：评论

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Two-direction MEMS Impact Acceleration Switch

Two-Direction MEMS Impact Acceleration Switch

引用

International Workshop on Intelligent Networks and Intelligent Systems (ICINIS)

作者： Shuangjie Liu Yongpin Hao Han Xie School of Equipment Engineering Shenyang Ligong University Shenyang China R & D Center of CAD/CAM Technology Shenyang Ligong University Shenyang China

This article summarizes research on a novel, two-direction impact acceleration switch. To sense the change of two direction impact acceleration, A MEMS impact acceleration switch with two sensitive directions was designed. In this design, four serpentine springs were used to fix and suspend the movable electrode (sensing mass). The motion of the sensing mass was investigated by theoretical analysis and finite element analysis (FEA). To investigate whether the serpentine springs' intensity was enough, the switch of the 1500g threshold acceleration in y direction and the 800g threshold acceleration in x direction was designed, simulated with Covent or Ware respectively. The simulation showed that the threshold accelerations basically fulfill the expectancy. To ensure the unintentional vibration inputs would not drive the sensor mass to the fixed electrode, the mode of the switch was analyzed and its natural frequency and the corresponding mode shapes were obtained from the calculation.

关键词： Sensors Switches Electrodes Springs Acceleration Stress Micromechanical devices

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Formalizing delegation authorization of workflow using graph transformation with variables

Formalizing delegation authorization of workflow using graph...

引用

International Conference on Management and Service Science, MASS 2009

作者： Yonghe, Wei R and D Center of CAD/CAM Technology Shenyang Ligong University Shenyang China

ISBN: (纸本)9781424446391

Supporting delegation mechanisms in workflow systems is receiving increasing interest from the research community. Using graph transformation as a formalism to specify access control has several advantages, from the intuition provided by the visual aspect to the precise semantics and the systematic verification of constraints. Using graph transformation with variables yields very expressive rules that are still comprehensible. After reviewing the basic notations of graph transformation with variables, this article presents specification formalisms for workflow delegation policies using graph transformation with variables. The authorization states are represented by graphs and state transition by graph transformation with variables. The proposed formalization provides an intuitive description for the manipulation of graph structures as they occur in workflow delegation and a precise specification of consistency conditions on graphs and graph transformations. We specifies a type graph to represents the type information in the graph transformation for workflow delegation, a set of rule schemes to build the system states and sets of positive and negative constraints to specify wanted and unwanted framework. ©2009 IEEE.

关键词： Authorization

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An ontology learning method for product configuration domain

An ontology learning method for product configuration domain

引用

International Conference on Management and Service Science, MASS 2009

作者： Shao, Wei-Ping Hao, Yong-Ping Zeng, Peng-Fei R and D Center of CAD/CAM Technology Shenyang Ligong University Shenyang China

ISBN: (纸本)9781424446391

Ontology learning, which seeks to discover ontological knowledge from various forms of data automatically or semiautomatically, can overcome the bottleneck of ontology acquisition in ontology development. Now most of existed ontology construction tools only support manual building ontology and it results in lowly efficiencies, highly workloads and many mistakes etc. At the same time, it's very difficult for knowledge updating and maintenance in time. In order to resolve these problems, a framework system of domain ontology automatic construction is proposed in this paper. Through ontology learning by using existed enterprise database and huge interrelated domain knowledge in Website, product configuration domain ontology is established. Key technologies of ontology learning, such as domain concepts extraction and semantic relationships between concepts extraction in different data sources structures, are discussed. ©2009 IEEE.

关键词： Ontology

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Planning and realization of collaborative assembly

Planning and realization of collaborative assembly

引用

6th International Conference on Information technology: New Generations, ITNG 2009

作者： Yongping, Hao Jingyu, Wang Pengfei, Zeng Weiping, Shao R and D Center of CAD/CAM Technology Shenyang Ligong University Shenyang 110168 China

ISBN: (纸本)9780769535968

The paper proposes that collaborative assembly is a process of on-line editing, modifying and managing products assembly information tree and converting it into graphics, analyzes the features of collaborative assembly system, points out the objective of collaborative design and brings forward the multi-level collaborative resolution and gives mode chart of layered collaboration. It brings forward a group of custom protocols including assembly operation subject protocol for realizing collaborative assembly activity, as well as the mixed construction mode of collaborative assembly system. At last, it implements assembly to specific product on the self-developed integrated network platform covering modeling, assembly and emulation, from which the result indicates that the layered collaborative resolution and mixed development mode presented in this paper are advantageous to collaborative assembly in distributed areas. © 2009 IEEE.

关键词： Assembly

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Fault Simulation for the Electrostatic Parallel-Plate Micro-actuator

Fault Simulation for the Electrostatic Parallel-Plate Micro-...

引用

International Forum on Information technology and Applications, IFITA

作者： Yongping Hao Fengli Liu R&D Center of CAD/CAM technology Shenyang Ligong University Shenyang Liaoning China

The fault analysis for the electrostatic parallel-plate is a critical issue in the design flow, as it played an important role in determining device reliability and the voltage required for successful operation. The simulations for pull-in and release voltages were carried in CoventorWare. The FEM model was constructed. The displacement of the upper electrode and corresponding capacitance between the upper and bottom electrode at different voltage are studied. The contact force and the stresses in the movable structure were presented. Electrostatic spring softing analysis interpreted the shift at the resonant frequencies.

关键词： Microactuators Electrodes Voltage Micromechanical devices Iron Electrostatic actuators Electrostatic analysis Analytical models Information technology Springs

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Polysilicon electrostatic comb MEMS actuator design and analysis

Polysilicon electrostatic comb MEMS actuator design and anal...

引用

Asia Pacific Conference on Postgraduate research in Microelectronics & Electronics (PrimeAsia)

作者： Fengli Liu Yongping Hao R&D Center of CAD/CAM Technol. Shenyang Ligong Univ. Shenyang China

The comb driver was designed and optimized to meet the requirement of enough displacement under lower drive voltage. device displacement could reach 11um under 30V drive voltage. For comb drive is an inherently unstable system stability analysis about electrostatic spring softing ensure its system stiffness. The inclined comb finger is one main factor to cause its failure. The critical displacement of the comb finger was analyzed.

关键词： Micromechanical devices Electrostatic actuators Electrostatic analysis Fingers resonant frequency Electrodes research and development Computer aided manufacturing cadcam drives

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