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The spindle motor in machine tool mostly adopt induction motor. In order to achieve dynamic control of the magnetic field and torque, one needs to estimate the synchronous induction motor electrical angle. The calculation is based on the basis of the rotor time constant. The accuracy of the parameter measurements will affect the performance significantly. How to improve the spindle motor torque is...
Recently, image processing is widely used in research on the habits and characteristics creatures. For example, the medaka (Oryzias laptipes) which breeds quickly is popular used in various experiments. In particular, observing the behavior of the medaka is important to understanding the ecology of their characteristics. In this paper, we proposed the tracking method based on image processing for...
In this paper, we present a hardware acceleration approach for a phylogenetic tree reconstruction with maximum parsimony algorithm using FPGA. The algorithm is based on a stochastic local search with the progressive tree neighborhood. The hardware architecture is divided in different units, each of which performs a specific task of the algorithm, to take advantage of the parallel processing capabilities...
Twitter has become one of the largest platforms for users around the world to share anything happening around them with friends and beyond. A bursty topic in Twitter is one that triggers a surge of relevant tweets within a short time, which often reflects important events of mass interest. How to leverage Twitter for early detection of bursty topics has therefore become an important research problem...
Basis pursuit denoising (BPDN) is an optimization method used in cutting edge computer vision and compressive sensing research. Although hosting a BPDN solver on an embedded platform is desirable because analysis can be performed in real-time, existing solvers are generally unsuitable for embedded implementation due to either poor run-time performance or high memory usage. To address the aforementioned...
For the case of precision guided munition against tanks a scheme of Integrated Guidance and Autopilot design has been discussed. The three dimensional interception problem has been resolved into two orthogonal two dimensional interception problems; the two orthogonal planes being the pitch and yaw plane. Using integrated guidance and missile autopilot system a sliding mode controller has been implemented...
Nowadays Beidou satellite has fully realized real-time positioning of vehicles. However, we found that when BDS was used alone, the unsteadiness in the satellite signal transmission process may cause the problem of error positioning. In order to solve the problem, we propose to use the BDS/DR vehicle integrated navigation system. Then we choose the Extended Kalman algorithm to filter the data which...
Based on the features of GPU architecture, this paper introduces CUDA into an existing Euler solver software for a 3-D Cartesian grid. Theories and Techniques used to solve the equations with finite volume methods using an explicit scheme are described. Two versions of GPU-based Cart Solver are implemented and optimized. For a real and complex model, the implementation on a NVIDIA GTX460se GPU by...
A technique capable of identifying electric vehicle (EV) mass in real-time has been a topic of research for several years due to the advantages it presents, such as the ability to dramatically improve range estimates, perform more effective torque vectoring for ABS/ESC, track delivery vehicle weight, etc. Some crucial issues in mass identification impede an easy implementation of such an algorithm,...
The aim of this paper is to present a new partitioning method for solving the equation of motion of a planar mechanism with more than one degree of freedom, using a hybrid dynamic model. The procedure is according to the Newton-Euler formalism with Lagrange equations and can be used in the case that some of the applied forces acting on the elements of the mechanism are unknown, but the time history...
This paper demonstrates the application of Infinitesimal Perturbation Analysis (IPA) to performance optimization of fluid marked graphs. Recent developments in the theory of stochastic hybrid systems concern IPA techniques for gradient estimation of performance functions defined on Petri nets and their use in sample-path optimization. This paper takes a first step towards eventual applications in...
It has been shown recently that unconstrained particles that follow the position and velocity update rules of a standard global best particle swarm optimization algorithm leave the boundaries of the search space within the first few iterations of the search process. Provided that a better solution does not exist outside of the search boundaries, these roaming particles are eventually pulled back within...
In low-cost INS systems (such as vehicle INS system, mobile phone INS system), inertial sensors have great error. Standard strap down algorithm which has very serious error accumulation, has been unable to meet the application requirements. To reduce error accumulation effect on navigation accuracy, taking into account the posture keeping unchanged when the vehicles is on urban roads, a navigation...
The goal of the development of wireless dynamometer based on the acceleration sensor is to resolve the long-term continuous monitoring of the indicator. The developed dynamometer has the main features: (1) used a ADXL103 acceleration sensor acquisition of the polished rod acceleration (2) used load sensor collection load signal, (3) used ADUC843 as the controller acceleration on the acquisition of...
Heterogeneous particle swarm optimizers (HPSO) add multiple search behaviors to the swarm. This is done by allowing particles to utilize different update equations to each other. Dynamic and adaptive HPSO algorithms allow the particles to change their behaviors during the search. A number of factors come into play when dealing with the different behaviors, one of which is deciding when a particle...
In this paper, we consider the problem of generating a feasible path connecting two waypoints in a three dimensional space with specified heading and flight path angles for a fixed wing micro air vehicle (MAV). The algorithm is based on simple geometric construction and can be used for generating paths for in flight waypoints. The guidance law used here is a modified version of the PN guidance law...
Tower cranes are commonly used at construction sites all over the world. These cranes are prone to swinging of the cable suspended payload, resulting in unwanted payload oscillations that have severe effects on the safety on the site as well as on operational speed and accuracy of the payload delivery. The nonlinear nature of the rotating crane motion makes controlling these oscillations a complex...
Using the recently proposed computationally efficient model predictive static programming (MPSP), a suboptimal guidance law is presented in this paper for guidance of small range tactical surface-to-surface missiles satisfying both way-point as well as terminal impact angle constraints. The guidance law also satisfies terminal lateral acceleration constraint, and hence, it indirectly satisfies terminal...
In this paper, a useful generalization of the Dubins method which aids lateral interception of a moving object by another object is presented. The classical Dubins approach is modified to suit this application and the corresponding path length equations are derived. Capturability conditions are obtained and supporting simulation results are presented.
As an essential unit of electronic equipments, crystal oscillator is widely used as frequency controller because of its high Q value and low consumption. However, crystal oscillator is sensitive to acceleration. In this paper, the effect and expression for vibration of crystal oscillator are analyzed, and the applications of crystal oscillator in electronic equipments are reviewed in detail. And then...
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