The gyrotron backward-wave oscillator (gyro-BWO) features broadband tunability, but ragged tuning curves are frequently observed experimentally. Accordingly, a Ka-band gyro-BWO experiment with external circuit mismatch was conducted to examine its tuning properties at two reflected strengths: one is slightly mismatched (15 dB reflection) and the other can be categorized as matched (30 dB reflec...

This paper deals with the construction of nonlinear observers for navigation purposes. We first present a globally exponentially stable observer for attitude and gyro bias, based on gyro measurements and two or more pairs of vector measurements. We avoid the well-known topological obstructions to global stability by not confining the attitude estimate to SO(3), but rather estimating a full rota...

First, this paper proposes a static north-seeking mode based on the meridian seeking torque of gyroscope. We analyze the force situation and stability of the gyro magnetic suspension system in this mode and focus on the principle of torque balance feedback control technology. Two-position rotary control technology has been designed based on the sensitive state of the gyro rotor in four special ...

A general uid moment in the particle coordinates is represented in terms of uid moments in modied guiding-centre coordinates with strong E × B ow derived by the phase space Lagrangian Lie-transform method [N. Miyato et al., J. Phys. Soc. Jpn. 78, 104501 (2009)]. It is called the push-forward representation of the particle uid moment associated with the guiding-centre transformation. The re...

In this paper, we propose a new driving mechanism for a spherical rolling robot and investigate the dynamic characteristics of the robot by theoretical analysis and numerical simulations. The spherical robot has a momentum wheel(gyro) that rotates at a large velocity inside the robot, and its mechanism may be expected to provide the driving force efficiently. However, the dynamics of the robot ...

The access to the information on the vehicle motion state is of great significance for the vehicle stability control and the development of active safety products. However, the vehicle state parameter extraction is primarily accessed by attaching special sensors to the vehicles, which usually requires modification of redesign of the vehicle with high cost. Smartphone integrate gyro, orientation...

In this paper, we present an app development using sensor signals from smartphone ans smart watch. We use Bluetooth communication for the connection between the smartphone and the smart watch. Smart watch includes a various of sensors such as acceleration sensor, gyro sensor, pressure sersor, etc. Using these sensors, we can measure the movement data of the user and transmit to the smartphone. ...

This paper concerns the control design of a PID controlled gimbals suspension gyro, whose parameters are determined by using bifurcation theory. The non-linear mathematical model of the gyro is deduced by using the nutation theory of gyroscopes. Considering a PID controller with constrained integral action, it is shown that depending on different values of the maximum allowed integral action a ...