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Focusing on detection technology for autonomous underwater detection device which found marine target which radiated noise signal submerged in background noise, chaotic detector based on Duffing oscillator is researched. In this paper, the Duffing oscillator and chaotic detector based on Duffing oscillator are described. Through numerical simulation and theoretical analysis, it is proved that the...
The paper presents a new methodology to solve the actuation and modelling problems of a soft-bodied swallowing robot (SR), developed for human swallow evaluation. To solve the actuation problem, a central pattern generator (CPG) based novel actuation scheme is developed and implemented to generate peristalsis in the robot. Machine learning based technique is used to determine the governing dynamics...
Urbanization is accelerating worldwide, giving rise to serious traffic problems. Traffic wave, known as stop-and go traffic or phantom intersection, is one of the most significant traffic oscillation patterns studied in Traffic Engineering. Usually these studies are numerical experiments that investigate specific places, such as a crossroad or a highway section, and their findings cannot, therefore,...
The digital control power supply has been widely used by virtue of its many advantages. However, it may cause limit cycle oscillations due to quantization in the feedback loop when the switching frequency is high. This paper presents an analytical model of buck converter using state space average method and derives the equilibrium expression in steady state, and the requirement for DPWM resolution...
This paper presents the biological control for a radially free distributed hexapod robot. The CPG(central pattern generators) network consists of six CPG units based on Hopf neural oscillator that used to generate rhythmic oscillatory signals for the end trajectories of legs. The ring-type network topology of CPG network that consists of six CPG units is established. By computing the inverse kinematics,...
The article is devoted to experimental studies and modeling of the fluctuations of analog-to-digital converter for dynamic authentication of computational devices. Modelling of phase trajectories of the fluctuation spectrum is made using the oscillator model. Phase portraits parameters allow to perform computer authentication. Temporary structures in the spectrum of the fluctuations are recorded experimentally.
Cardiovascular diseases are the leading cause of death globally. Such diseases may affect the left ventricular function, which in turn is closely related to the left ventricular stiffness. Estimation of cardiac deformation can give information on the myocardial stiffness, and may therefore be important in assessment of cardiovascular diseases. A 3D motion estimation scheme is necessary to measure...
Detecting sustained oscillations at their early stages can improve power system's situational awareness (SAW), and allows operators take remedial reactions to potential threatens to system's stability. Previously coherence spectrum based detection methods have been proposed to detect sustained oscillation in low signal-to-noise ratios (SNRs) using phasor measurement unit (PMU) data. However, their...
This work provides a comparative review of three different numerical methods generally used to discretize continuous-time non-linear equations appearing in model predictive control problems: direct multiple shooting, direct collocation and successive linearizations. An overview of the characteristics of each method is given and the performance of each method is evaluated through the simulation of...
The key of early fault detection is weak signal detection. But traditional chaos detection methods can deal with weak signals of single frequency and limited signal to noise ratio, and when noise is too strong, performance of the detection system is decreased. Thus it can't meet the needs of an aircraft rotor system's early fault detection, including weak signal, strong noise and multi-frequency....
No restrictions are imposed on the motion states of missile and target and the line of sight rotation coordinate system is introduced into the derivation of differential geometric guidance law. Then, the extended differential geometric guidance law is achieved whose scope of application is largely extended. In order to realize the derived law, instead of the complex computation of torsion command,...
In this study a numerical cryptanalysis of a random number generator (RNG) which is built on a continuous-time chaotic oscillator is introduced. In order to scrutinize the security weaknesses of the RNG, a master-slave synchronization approach is presented as the basis of an attack scheme. By proposing this attack scheme, it is aimed to verify whether there exist any possibility to divulge the hidden...
This paper presents a novel control methodology which uses an extremely low-resolution encoder to achieve a desired harmonic trajectory. The particular application of interest is a cellular microinjection technology called the Ros-Drill (Rotationally Oscillating Drill) for ICSI (Intra-Cytoplasmic Sperm Injection). It is an inexpensive set-up, which creates high-frequency (e.g. 500 Hz) and small-stroke...
This is the second part of the paper devoted to the problem of aircraft control during take-off in the presence of windshears. Here, simulation results based on the control procedures described in Part I are presented.
A new simple two-transistor four-dimensional (4D) chaotic oscillator is proposed using two sub-circuits, i.e. a modified single-transistor Colpitts oscillator, and another singletransistor sub-circuit for the fourth dimension. The circuit is much simpler than two existing two-transistor 4D chaotic circuits, as it has only nine electronic components, and only eleven algebraic terms in the state equation...
The heliocentric motion of the solar sail spacecraft (SSS) is described in classical Keplerian elements. The solar sail with an ideal reflection coefficient is considered. The spacecraft performs a non-coplanar motion with the sun gravity and the light pressure. Disturbances of other celestial bodies gravity are not considered. To confirm the results correctness, we simulated the motion of solar sail...
The problem of regulation oscillatory modes with set characteristics in a controlled subsystem by means of the amplitude of oscillations of the control generator is considered. The control generator is connected with the system control object in a nonlinear feedback mode. The structure of control functions, which depends on the variables of the controlled subsystem is studied for the control generator...
Coriolis vibrating gyroscopes can be modeled by a planar resonator, using masses, springs and damping. In this paper, the corresponding equations are studied in order to characterize real vibrating cells. It is shown how to present the problem to allow efficient numerical simulations and analytic developments. In particular, the use of the method of Averaging is fundamental, simplifying most of the...
This paper extends the longitudinal walking controller of biped robots proposed by one of the authors to walking along a smooth curved path. The previous controller defined in a fixed inertial frame is redesigned with respect to a moving frame attached to the center of mass (COM) of the robot in order to achieve walking along an arc. As a result, it is found that a desired position of the zero-moment...
Early isolation of small faults is an important issue in the literature of fault diagnosis. In this paper, for a class of nonlinear lipschitz systems with output measurements, an approach for rapid isolation of small oscillation faults is presented. By utilizing the knowledge obtained through the deterministic learning, a bank of estimators is constructed for the training normal mode and oscillation...
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