This paper presents a new design method of balance weights with phase angles for scroll compressors. Based on force and moment balances on crankshaft and compressor frame, mathematical formulation of shaft bearing loads, unbalanced force and moment acting on the frame has been made in terms of balance weight design parameters such as masses and phase angles of the upper and lower balance weight...

We consider a classical problem of capillary neck between parabolic body and plane with small amount liquid in between. In the state thermodynamic equilibrium, contact area bodies layer has circular shape. However, if are forced to slowly move tangential direction, shape will change due hysteresis angle. discuss form under two limiting assumptions about friction law boundary line. also present ...

Kinetic helicity is one of the invariants of the Euler equations that is associated with the topology of vortex lines within the fluid. In superfluids, the vorticity is concentrated along vortex filaments. In this setting, helicity would be expected to acquire its simplest form. However, the lack of a core structure for vortex filaments appears to result in a helicity that does not retain its k...

Accurately measuring the incident angle of laser Doppler vibrometer (LDV) beam is crucial for calculating accurate dynamic response a target. Nonetheless, conventional methods may encounter limitations due to spatial constraints. To address this issue, novel high-precision method proposed based on principle LDV. Furthermore, compact device constructed facilitate method. The involves simulation ...

Abstract Microelectromechanical systems (MEMS) based ring shaped resonators usually have a supported by spoke springs. In this paper, we developed general analytical model that can determine the natural frequency of any MEMS resonator considering effective mass and stiffness spokes in both radial tangential displacements. Our is also able to circular curved beam with arbitrary central angle. Th...

From the tangential velocities of stars all over the sky, one can, in a statistical way, infer their 3D velocity distribution. An application to Hipparcos data reveals rich structure in the planar stellar motions: there are several moving groups, increasing in number with stellar type but decreasing in importance. A distinct group of outward moving stars with low rotation velocities might be as...

The turbulent flow in a tangential inlet / tangential outlet vortex tube is numerically simulated using a modified   k turbulence model. The results are compared to experimental measurements from literature. The modified model shows better agreement with the local tangential velocity measurements compared to the standard and RNG   k turbulence models. The flow structure is also demonstrated...

FDK algorithm is a well-known 3D (three-dimensional) approximate algorithm for CT (computed tomography) image reconstruction and is also known to suffer from considerable artifacts when the scanning cone angle is large. Recently, it has been improved by performing the ramp filtering along the tangential direction of the X-ray source helix for dealing with the large cone angle problem. In this p...