Quaternion Kalman Filter Design Based on MEMS Sensors

Abstract

Controlling UAV requires high-precision dynamic information input. However, mini UAV needs more demands because of the its small volume. Using MEMS sensor can make the UAV become high-precision, low power consumption and inexpensive machine. Accelerometer and magnetometer can measure the acceleration of gravity and geomagnetic field that the vectors are uncorrelated, which can be considered as a vector in order to correct the gyroscope. Kalman filter based on quaternion has been adopted in this study in order to achieve the attitude measurement and error control of transporter.

Control of Generalized Capillary Number on Immiscible Displacement Path: NMR Online and Network Simulation of Fluid Displacement Mechanism

“…According to the conceptual model (Figure ), the water-flooding process can be simulated by establishing a cluster of parallel pore-scale two-phase flow models, which is a function of the pore-throat structure. To simplify the NS equation, it is assumed that the viscous fluid flows steadily along the pipeline in a tight sandstone, the viscous fluid and rock are incompressible, and the flow process is laminar, which satisfy the Newtonian fluid characteristics …”

Experimental Study on the Stabilization Mechanisms of CO2 Foams by Hydrophilic Silica Nanoparticles

“…As the demand for energy increases along with the difficulty of oil recovery, more efficient and environmentally friendly methods of oil recovery are required. Dating back to the 1950s, foam has been used to improve the oil displacement for enhanced oil recovery (EOR); this method is especially effective in a nonhomogeneous formation . CO 2 flooding has been widely used as an efficient EOR method since 1972, but due to its low viscosity and low density, CO 2 flooding can easily result in gas channeling and gravitational differentiation in high-permeability formations and, therefore, has low sweep efficiency .…”