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This paper proposes a sensorless chatter detection method for a ball screw drive system used in milling, by introducing the mechanical energy factor (MEF). The MEF is an indicator for detecting self-excited chatter, based on the power factor theory used in electric systems, and monitors the phase difference between dynamic cutting force and displacement. By monitoring the MEF, the self-excited chatter...
The paper provides the mathematical model describing the movement of different kinds of avalanche snow mass and its interaction with obstacles based on the modified method of particle dynamics. Further, the authors introduce their algorithm to calculate avalanche impact on buildings and structures; this algorithm underlies a computer program that allows you to set the basic parameters of a building,...
In order to study the contamination characteristics of insulators under different conditions and to ensure the safe operation of electrical systems, the mechanical properties and motor characteristics/behavior of particles near the insulators were analyzed. A wind tunnel contamination test of a porcelain insulator was also conducted. The deposition criteria model based on energy of particles on the...
This paper presents a system for dynamic measuring of leg length discrepancy (LLD). The system consists of two 3-RPS parallel manipulators with three degrees of freedom. Parallel manipulators have force sensors that determine the patient's center of gravity (COG) displacement. By changing the height of the moving platform of the parallel manipulator, COG returns in its expected position. The difference...
This paper presents the derivation, in great detail, of the full nonlinear model for a quad-copter, using D'Alembert's principle. The final model is presented in a form suitable for simulation and control. Finally, the quad-copter model is implemented and a simple control law for the attitude and altitude are derived. Numerical results are presented at the end of the paper.
Based on the field-oriented control (FOC) theory of the PMSM, the paper firstly analyzes the mathematical model of the permanent magnet linear synchronous motor (PMLSM), and then it designs the platform of the linear motor servo drive to accomplish the PMSLM operating characteristics, including both steady state and dynamic state. Comprehensive test results verify the rationality and feasibility of...
Corona discharge due to a conductive particle in highvoltage system is analyzed using a coupled equation, which consists of Poisson's equation for electric field distribution and a discharge equation for space charge density variation. The charge of a conductive particle is calculated using the finite element method, and the electric force acing on the particle is obtained using the calculated result...
Hair cells are thought to be passive transduction systems able to convert a mechanical pulse in an electrical signal. In this paper, we have investigated the polyelectrolyte properties of actin filaments which in interaction with myosin motor proteins represent basic participants in mechano-electrical transduction in the stereocilia, mechanosensing organelles of hair cells. We have elaborated a biophysical...
This paper presents a new multi-muscle force estimation approach based on a HD-sEMG/force model in experimental context. Accordingly, we will try to estimate the muscle force of the three elbow flexors: Biceps Brachii (BB), Brachialis (BR) and Brachioradialis (BRD) in isometric isotonic conditions. This will be done by using a recently proposed sEMG/force equation model validated by simulation. For...
Elderly people have some problems about their decrease in lower limb function. So, there is a possibility of falling and causing serious injury when standing or sitting. The purpose of this research is to construct a system that enables elderly people to receive safe and high quality rehabilitation. At the first, analysis of trajectory of standing and sitting motion is performed. Thanks to the analysis,...
The subject studied the relationship between tissue dynamics caused by Quadriceps muscles movement in the knee extension — flexion state and the signal measured from the EMG sensor. Establishment of force and momentum force equations generated by the muscle groups, EMG momentum and voltage equations. Using the Arduino Uno controller, read the signal from the EMG sensor, and save it to an SD memory...
The paper presents an overview of various steps required for solving the problem of designing electric drives for traction applications. The design problem is solved as an optimization problem with multiple objectives subject to various constraints governed by physical characteristics and limitations of materials and specific parts used for the assembly of electric motors and power converters, international...
Pectoral fin types of biological fish have an enormous diversity, and they play an essential role in locomotion of fish. The adaptation to shapes and movement mechanism of pectoral fin types helps swimming motion of the main body effectively, that results in the high flexibility and maneuverability of locomotion. This paper proposes a hydrodynamic model of a type of flexible pectoral fin (FPF), which...
In this paper a novel formation control frame-work is presented for unmanned autonomous ground vehicles based on analytical mechanics and multibody interpretation. The coordinated motion is achieved by introducing holonomic constraint functions that describe the interaction between the vehicles. These functions are interpreted as constraint forces and the decentralized control law is determined for...
This paper focuses on the control system design for a wearable power assist device which provides force/torque support for people who are doing physically demanding tasks. The device is actuated by the McKibben artificial muscle. The McKibben actuator is know to exhibit high nonlinearity between the supply pressure and the contractile length, and it is basically difficult to design a high performance...
We present a type of high performance contact-separation mode triboelectric generators (TEG). The TEGs consist of a poly(vinylidene fluoride) composite with embedded barium titanate nanomaterial (PVDF-BaTiO3) and polyamide-6 (PA6). Additional BaTiO3 nanomaterial in the PVDF increase the relative permittivity and piezoelectric effect, thus enhance the performance of the TEGs. Owing to the increased...
Study of electron transport in nanopillar transistor at 300K shows that elastic vibration is an intrinsic behavior of the device. The frequency observed in the drain-source current is found to agree with the charging frequency. Given a quantum dot of size 10×10×9nm3, the maximum displacement is estimated to be 0.3nm. Once the displacement diminishes to zero, single-electron tunnel becomes the dominating...
Direct torque control using space vector modulation (DTC-SVM) is one of the most popular control methods of induction motor for electric vehicle (eV). This paper proposes DTC-SVM with improved deadbeat control. During uphill and downhill, instant torque changes is problem for drivers. The principle of the developed method is a solution to overcome the torque need on unexpected road conditions. In...
The paper offers mathematical models and software for electromagnetic calculations in conducting plate with flaws (cuts). It solves the problem of the influence of one or more straight line intersecting in one point of flaws on eddy currents and electromotive force (EF) induced in a coil with current. The coil is located above the nonmagnetic infinite plate orthogonally to the lines of flaws. Under...
The paper presents a methodology to control the hydraulic gap device of a thick plate rolling mill. The method is based on modeling the next metal pass of through the rolls and on the preliminary calculation of the hydraulic pressing device movements values during the rolling process. The results of this method are compared with an indirect method of thickness measuring. Based on the conducted experiments,...
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