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Low frequency noise is the main noise sources of wind turbine, causing annoyance for daily life. This paper proposes a simplified model for wind turbine low frequency noise sources through three elements: noise sources, propagation paths and perceived signals of acoustic vector sensors(AVS) array. AVS array is utilized for far field source localization, offering a key advantage with respect to conventional...
BLP model is a classic model of significant strategies of confidentiality. By classifying and marking the subjects and objects, it realizes the discretionary access control and mandatory access control. Existing system security models are mainly based on the improved BLP model. Along with the popularity of mobile devices, cross-platform system based on Web is attracting more and more attentions. For...
In order to mimic a real fish, the back bracket of a biomimetic-underwater vehicle's (BAUV's) tail fin is composed of aluminum spacers with a flexible aluminum plate as the tail spline. The sway of the tail fin is driven by a motor and its motion is impeded by the water such that the rotation angle of the tail fin could not be calculated simply by a coordinate conversion. For precise tail fin control...
Graphene oxide/carbon nanotube (GO/CNT) films with different CNT contents were prepared by a solution-casting method. The oxygen-containing groups on the GO/CNT films were removed by thermal annealing at 200 °C and the corresponding hybrid graphene/CNT films were obtained. The graphene/CNT films have good mechanical and electrical properties as well as high stability in electrolyte due to the combination...
In this paper, we present methods to generate a stable and realistic force rendering between virtual hand and object for a hand rehabilitation system. There are multi-contact regions between hand and object. For each contact region, the virtual contact force is modeled upon the spring-mass model. As direct rendering with spring-mass model in a large stiffness will induce instability of the haptic...
This paper investigates the deformation simulation of hand-object interaction for the virtual rehabilitation system of hand. The deformation along the contact normal on hand and object is investigated. Following the anatomy of human hand, the virtual hand organizational structure is simplified as a 2-layered representation, of which the inner layer models the rigid skeleton, and the outer layer represents...
Based on the summarizing and comparing the caculation methods of ship, the third phase primary navigation project of Hangzhou xixi wetland park was taked as example, the suitable formula and the elastic-plastic finite method with progressive failure was selected for calculating the climbing height and diving depth and action force of ship wave on the slope. At last, the suggestion about slope protection...
The fiber model of Dalian Bay Bridge is established with simulating plastic hinge by distribution hinge model, nonlinear time-history is analyzed by Midas/Civil based-on elastic-plastic theory. Compared of time-history results between elastic to elastic-plastic stage showed: the internal forces of structure are reduced mainly in bending moment and axial-force on tower root, because of dissipation...
This paper investigates the simulation of a virtual index finger interacted with an object for a virtual rehabilitation system of human hand. Corresponding to the anatomy of human hand, the virtual finger is modeled as three phalanges which are connected by three joints, which is essentially a 4-Degree-of-Freedom (DOF) open chain mechanism. The special characteristic of the virtual finger poses the...
Aiming at the problems and the shortcomings of the existing authentication model, a lattice based cross-domain model is proposed. At first, by the use of the lattice theory, and on the two dimensional coordinates; this model builds the credit-domain alliance and the user alliance. It imports the interplay double validates mechanism, so it can avoid the abuse of centralized plans for the whole authentication...
Based on Horner' rule and Baugh-Wooley algorithm, this paper presents two novel bit-level parallel array algorithms of 2's complement multiplication, and the algorithms have been mapped to systolic arrays by using linear mapping techniques. We propose two efficient systolic arrays of multiply and accumulate (MAC) operation and we also describe the vector-vector and matrix-matrix multiplication that...
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