In the recent years, the main obstacles for raising the operating efficiency are instabilities of the compressor system. The related dynamics and control schemes then cause lots of interests among engineers and researchers. Two main phenomena, which cause the instabilities, are the “surge” and the “stall” behaviors of the compressed gas. The so-called “surge” is characterized as a one-dimension...

The objective of this study is to develop a controller to perform trajectory tracking for a Biomimetic Autonomous Underwater Vehicle (BAUV). A mathematical model of a BAUV including both a caudal fin and pectoral fins is proposed for the motion simulation. Control patterns to manipulate the caudal fin and a pair of pectoral fins are developed. For body-caudal fin control, parameters that are es...

In water supply channels, the brusque operation of control gates may induce large unsteady flow motion called surges. Such a rapid operation of gates must often be restricted, although it may be conducted to scour silted channels and sewers. Herein a physical study was conducted under controlled flow conditions to study the turbulent mixing in the very-close vicinity of a rapidly opening/closin...

Flood waves resulting from dam breaks and flash floods have been responsible for numerous losses. In the present study, sudden flood releases were investigated down a large flume with a succession of abrupt drops. A new experimental technique was developed to obtain instantaneous void fractions, bubble count rates and velocities using arrays of conductivity probes. The results showed the surge ...

Research toward the development of point absorber ocean wave energy converters (WEC) is migrating from energy absorption of ocean wave heave only, to the absorption of heave and surge. Due to the additional dimension of surge, the mathematic relationship between the ocean waves and the WEC has shifted from a linear model to a nonlinear model. This change has made back driven wave height from de...

The X-ray microbeam method for measurement of articulatory dynamics has been used to acquire large amounts of data, with reduced X-ray dosage, resulting in one of the most widely used freely available speech production databases. The Xray Microbeam Speech Production Database (XRMB-SPD), developed at Wisconsin University, USA, includes a vast amount of coordinate data describing articulatory mov...

Platform motions induced by waves pose a challenge to accurately predict the aerodynamic performance of floating offshore wind turbines (FOWTs). In view this, power and wake structure FOWTs under platform pitch, surge, their combined were investigated in this paper, using computational fluid dynamics software, STAR-CCM+, with overset meshing rigid body motion techniques. First, simulation cases...

Abstract. The aerodynamics of floating turbines is complicated by large motions which are permitted the foundation, and interaction between turbine, wind, wake not yet fully understood. object this paper a wind tunnel campaign finalized at characterizing aerodynamic response 1:100 scale model IEA 15 MW subjected to imposed platform motion. turbine studied focusing on thrust force, torque, 2.3D ...