This paper proposes a saturated function series approach for generating multiscroll chaotic attractors from the fractional differential systems, including one-directional (1-D) n-scroll, two-directional (2-D) nxm-grid scroll, and three-directional (3-D) nxmxl-grid scroll chaotic attractors. Our theoretical analysis shows that all scrolls are located around the equilibria corresponding to the sa...

The co-rotating mechanism is utilized for scroll vacuum pump application by one of the authors. It was found that the corotating scroll compressor is transformed to a centrifugal compressor by reducing the eccentricity between the two scrolls to zero. The authors propose a co-rotating scroll compressor which works not only as a positive displacement compressor, but also as a centrifugal one in ...

In the trust-centric context of signed networks, the social links among users are associated with specific polarities to denote the attitudes (trust vs distrust) among the users. Different from traditional unsigned social networks, the diffusion of information in signed networks can be affected by the link polarities and users’ positions significantly. In this paper, a new concept called “trust...

The impact of the power frequency on the performance of a scroll compressor was investigated. Two representative frequencies, 50 and 60 Hz, were used to quantify the effects of the power frequency on the scroll compressor performance characteristics for the same design. The major physical mechanisms responsible for the scroll compressor performance were identified. The changes induced by the po...

Most scroll compressor models are based on a geometrical description of the scroll wraps. Since geometry is one of the main factors affecting the efficiency of the compressor, a complete description of the geometry of scroll wraps has to be known in order to establish an accurate thermodynamic model. Most authors do not yield an analytical expression of the discharge chamber, also because their...

Scroll waves are vortices that occur in three-dimensional excitable media. Scroll waves have been observed in a variety of systems including cardiac tissue, where they are associated with cardiac arrhythmias. The disorganization of scroll waves into chaotic behavior is thought to be the mechanism of ventricular fibrillation, which lethality is widely known. One of the possible mechanisms of scr...

An experimental rig has been built to test a horizontal scroll compressor and a reciprocating compressor of similar size and capacity. The compressors were tested with refrigerant.R404A operating at varying evaporator and condenser temperatures. The paper provides much needed information regarding the efficiency of the compressors operating under the same conditions with the same system paramet...

This paper presents the optimum combination of major parameters for high mechanical efficiency of a compact scroll compressor with a fixed cylinder diameter. The mechanical efficiency was calculated for a number of cylinder volumes, where the cylinder diameter and the scroll thickness were fixed at a constant value of 75.7 mm and 4 mm, respectively, and combinations of the involute base circle ...

This paper describes the geometric properties required to form the walls of a functional scroll compressor, and a practical design procedure that has been used at the University of Maryland to generate more general scroll geometries and model their performance. It presents several examples of this technique, showing how it can be used to meet practical design challenges, optimize operating para...