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The Square Kilometer Array (SKA) has now entered into the pre-construction phase, A hundred of institutes in about 20 countries including China have been involved in its key technology development. The Dish Verification Antenna China (DVA-C) is a prototype being built to farthest meet the requirements from the SKA scientific goals, with unique skin-and-rib structure single-piece panel reflectors....
The Dish Verification Antenna China (DVA-C) is a prototype being built to farthest meet the requirements from the Square Kilometre Array scientific goals. In this paper, the details of the optical design of the DVA-C are presented, including the dish optics, and the estimated performance. Although the DVA-C is designed for optimal performance on bore sight, it is potentially employed for phased array...
This paper presents novel Ku-band waveguide phased array antenna concepts for Mobile Satellite Communications. The array is based on multiple layers hybrid mechanical electronic steerable solutions. The design provides transmit and receive functions. The forward link of satellite communication is 12.25 to 12.75GHz, and the return link is 14.0 to 14.5GHz, which is for a bi-directional communication...
Pattern synthesis algorithms for phased array antenna beam shaping are mostly optimization algorithms, and the convergence speed of the algorithms has much influence on their characteristic. Aiming at this problem, this paper proposes an improved perturbation alternating projection method, which is not much affected by optimization algorithm convergence degree constraints. By setting the shaped region...
A numerical simulation model based on the KIVA code was carried out for a DI diesel engine in-cylinder process. Two candidate chambers were compared with the original chamber to study their effects on combustion and emission characteristics. The results show that low emission was achieved in the chamber C with maximal bowl diameter and bowl depth. Compared with the original chamber, Soot and NOx of...
An experimental study on economical and emission characteristics of a high-speed inter-cool diesel engine with butanol-diesel blended fuel was executed. With the butanol blended by three volume ratios (0%, 20% and 30%) in the diesel, the brake special fuel consumption (BSFC) and soot emission were analyzed under different loads. The results show that the fuel with 30% butanol has little influence...
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