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Commercial piezoelectric actuated stages usually has been decoupling designed from the mechanical structure. This paper develops a piezoelectric actuated stage (P-563.3CD) experiment platform. Observed cross-coupling effect in the piezo-stage is below 1%. In order to improve the performance of piezo-stage in a further step, a multi-channel Hammerstein model is developed to describe the cross-coupling...
During coilgun launching, the driving coil and the armature will generate a lot of heat due to pulsed current. Especially in the local area of the armature, temperature may exceed the melting point because of the skin effect, so that the launching performance will be influenced. Therefore, it is very important to investigate the temperature distribution for optimizing the launcher design and improving...
In practice, the Unscented Kalman Filter based on the scaled unscented transformation is usually used as a default form with a set of constant scaling parameters. Sometimes this form cannot obtain the ideal performance and is lack of robustness, especially when it is applied to some highly nonlinear models. This paper, therefore, proposes a new method by modifying the main scaling parameter at every...
Trust in Peer to Peer network has the fuzzy feature, and thus it cannot be described and handled using distinct mathematic model. To solve the problem, based on the advantage of using intuitionistic fuzzy theory to handle vague information, we propose a novel P2P trust model named IFTM (Intuitionistic Fuzzy theory based Trust Model), which uses membership, nonmembership and hesitancy degree to describe...
Based on Reynolds-averaged Navier-Stokes equations, the three-dimension solid model, three-dimension model without supporting frame and two-dimension model of orifice rotameter were computed using computational fluid dynamics (CFD) method. The numerical computational results and experiment data were compared and analyzed in detail. It can be learned from analysis that the full-scale error of two-dimension...
A new real-time simulation system is developed based on the Real Time Workshop (RTW) and real-time operation system VxWorks. The whole model of satellite is defined, which is proved by simulation in Simulink. This model is divided into two parts. One part is the attitude and orbit controller, i.e., attitude and orbit control system (AOCS), named AOCS model. The other is the external model of AOCS,...
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