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The development and utilization of wind power systems and new energy research and development is the focus and hotspot of the world. DFIG (Double-fed Induction Generator) has become the main object of wind power research with its unique operating characteristics. Decoupling Control of Active Power and Reactive Power of Doubly-Fed Machines is a Key Problem in the Research and Development of Wind Power...
Underwater noise from shipping is a growing presence throughout the world's oceans. Exposure to loud noise can have various effects on marine animals. This paper presents a method which can characterize sound exposure from shipping based on Automatic Identification System (AIS) shipping data. Firstly, the tonnage, speed, draft, latitude and longitude of each ship can be obtained from real-time AIS...
The temperature in the sea is an oceanographic variable that indirectly determines many of the peculiarities of sound transmission in the medium. It varies with depth, the seasons, geographic location, and also time at a fixed location. In order to obtain the temporal and spatial statistical characteristics of temperature, the temperature field in the summer of 2013 was observed continuously at certain...
Autonomous robots are required to avoid the obstacles during navigation. For this purpose unknown and unexpected obstacles have to be detected during motion. The proposed approach uses particle filters to process sensors data and estimate relative position of the robot with regard to the obstacles and to the goal. These relative position estimations are inputs to the velocity potential field approach...
the pervasive deployment of intelligent devices in the critical infrastructures sector and the high dependency of these devices on the Internet motivated attackers to target the communication and control protocols of these devices. DNP3 over TCP/IP is among those protocols that are widely used as communication and control protocols in critical infrastructures. Due to the facts that security was not...
This paper briefly introduces how and where SmartMeters are commonly installed, the FCC regulations on SmartMeters. The calculation of MPE is presented. The co-located SmartMeters installation and respective public concern are discussed.
A novel stacked CP patch antenna with broadband performance is developed and discussed in this paper. We increased the air substrate and used two long coaxial probes to feed the antenna in order to gain broadband CP performance. A hybrid coupler was welded on the feeding circuit to generate two orthogonal modes with 90° phase difference. The measured results show that the antenna have an impedance...
The aim of the paper is to validate the implicit finite difference NND scheme, first developed in early 1990's for use in CFD-CSD interaction problems. The focus was on implementing the existing numerical scheme of NND for validating the unsteady flow over NACA0012 airfoil using thin-layer Navier-Stokes equation. The equation was coupled with the structural dynamic model to identify the conventional...
On the basis of elaborating the traditional tension control, a new software design in which digital motol control and digital display used is offered. Simple and effective practical yarn tension controlling system of MCU design is adopted in its hardware. It, meantime, discussed the tension transmission system, specific quantization and the anti-interference problems. The results show that the controller...
A theory and method of collaborative design of product assembly structures and assembly processes is addressed. In this theory, from the view of concurrent design of product structures and assembly processes, various assembly evaluation indices such as assembly efficiency and assembly complexity degree are defined, resulting in the establishment of a composite evaluation system for product assemblability...
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