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In this paper, a control strategy to overcome the perturbation problem in quadcopters, primarily in simultaneous flight, using a smoothly saturated error correction, is presented. The quadcopter dynamic model is reduced through feedback linearization. Then is designed an integral-backstepping-like controller, where the error correction actions are limited using a smooth function. Numeric simulation...
Coaxial-rotor configuration with the compact structure and vertical take-off ability make itself a good configuration to execute highly difficult task. In this paper, the structural design of coaxial-rotor system is introduced, and we discuss the control principle behind coaxial configuration. Then, the dynamic modeling is presented based on the combination of considering two rotors as dynamics model...
The concept of energy harvesting has been widely accepted as future necessity for the society, accelerating its transition to the environment of the so-called green technologies. The energy harvesting approaches in various domains of human surroundings have been considered, among them those related to the energy of ambient electromagnetic field (EMF). In this early research paper, the inductor with...
This paper aims to present a methodology that helps improving systems modelling by using Process Integration and Design Optimization technologies. Then, the methodology has been applied on an automotive case study: the improvement of the hybrid vehicle TOYOTA PRIUS III modelling. This work has been carried out in the context of the international research program PLACIS (PLAteforme Collaborative d'Ingénierie...
This paper proposes a method to calculate the lift force of propeller using simulation software FLUENT. And on the basis of this, a certain degree of applicability of the formula from blade element theory is verified. It also presents suggestions for the analysis of the lift force of the propeller in the case of the impact of the incoming flow.
The unmanned aerial vehicle (UAV) formation flight is similar with the social behavior of biological populations. Inspired by the similarity, a method of autonomous formation control based on the mechanism of wolf packs is proposed. Firstly, a multi-UAVs controller based on potential field method is designed. Secondly, a model of the wolf packs hierarchy model by imitate the behavior of wolf pack...
Based on the characters of repulsive force actuator for its fast speed in the opening and closing process, a kind of new-type fast circuit breaker energized by fault current was designed in this paper. With bus shunt as excitation current, double coil tandem repulsive force actuator and permanent magnetic actuator were composed together. This hybrid circuit breaker with new-type of excitation doesn't...
This paper introduces a new kind of vertical underwater glider with swing wings, combining Argo float and underwater glider together to achieve the goal of operating in the ocean automatically. The paper analyses the rectilinear motion and force of this new kind of underwater glider. The calculated and simulated results are shown in this paper.
The most critical part of the induction machines which determines on their life time operation are rolling element bearings. To ensure reliable drive with an induction machine requires deep insight in electro-mechanical dynamics during its operation. The flexible multibody modeling technique enables the simulation of dynamic loads on all drive components. This paper focuses on complex dynamic modeling...
This paper investigates the dynamic acoustic sorting method from a theoretical perspective. Analytical equations of motion and numerical simulations have been used to optimize parameters for sorting various particle mixtures. The effect of changes in field parameters as frequency or voltage on efficient sorting has been investigated. Experiments have been carried out to verify theoretical findings.
One of the fundamental problems in wireless sensor networks is providing area coverage to fulfill a certain task. This problem in directional sensor networks is more challenging because of limited sensing angle of directional sensors. This paper addresses the problem of deployment and orientation of a specific number of directional sensor nodes in order to maximize the area coverage. First, we present...
In this article some approaches to identification criterion synthesis is under investigation. As a target systems a chaotic Lorenz, Duffing system, and a system with dry friction force are used. For all target system a functional criterion is created and identification process simulations was conducted.
Magnus rotor wing is a novel roll reduction device that it generates anti-rolling force through the rotation of the rotor wing installed at the bilge of ship hull to reduce ship's roll motion. It is effective at medium/low speed and at zero speed, which is different from fin stabilizer. This paper focuses on the situation that the rotor wing is perpendicular to ship hull. The lift generating and anti-rolling...
The paper attempts to analyze the dynamic characteristics in the perfusion process of the hepatic vessel. A model of rugged vessel with a foreign matter was established based upon medical imaging data. The fluid flowing in the rugged vessel was simulated using the perfusion method of the symmetric pulsating flow (SPF) and the steady flow under the bidirectional fluid-structure interaction (FSI). The...
In the process of high speed micro cutting, the tool wear resistance is directly related to the machining performance and service life. Therefore, the wear resistance of the tool is the key to the research of high speed machining technology. The micro-texture is placed in the cutting tool surface based on the research of non-smooth surface. Using the simulation software to simulate the machining of...
The reliability and stability of electrical interconnections are of utmost significant things for electrical connector which plays a great role in the signal transmission and control. The objective of this study has investigated in the relationships between the insertion force and two parameters (convergent angle and concentricity) of a kind of electrical connector by Abaqus software. According to...
In this paper, we report the simulation result of a precise 3-axial servo controller for a positioning mechanism in an inchworm mobile mechanism. Also, we describe the design of bang-bang controller for θ-axis that is required for developing 3-axial controller. The inchworm mobile mechanism is composed of 6 piezoelectric actuators (PAs) and a pair of electromagnets (EMs). If one EM is fixed to a ferromagnetic...
The stiffness of deployable structures based on scissor-style unit is often insufficient. The stiffness can be improved by changing the element if the stiffness model of deployable structures based on scissor-style unit is modeled. Firstly the force of single scissor-style unit needed to be analyzed in order to get the force model of every joint in each unit. Then the stiffness model of deployable...
The dissertation has researched the structure of eccentric shaft from the power end of the radial reciprocating piston pump, and has analyzed the unbalanced inertia force generated in the process of high-speed rotary motion. It has pointed out the requirement of dynamic balance design of the eccentric shaft, and has completed the dynamic balance design of the eccentric shaft. The ADAMS was used to...
Reduction of the spatial harmonics of back electromotive force(EMF) is a useful way to reduce thrust ripple of permanent magnet linear synchronous motor (PMLSM). In this study, a method of v-skewing in the coils is proposed to reduce the harmonics to suppress thrust ripple in the PMLSM. The thrust and the harmonic are generated in a double-sided PMLSM model. The 3-D finite element method (FEM) is...
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