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Ensemble methods use multiple classifiers to achieve better decisions than could be achieved using any of the constituent classifiers alone. However, both theoretical and experimental evidence have shown that very large ensembles are not necessarily superior, and small ensembles can often achieve better results. In this paper, we show how to combine a set of weak classifiers into a robust ensemble...
Plastic extrusion is a typical plastic manufacturing process. After heating, plastic with high resilience and low viscosity, dependent on the temperature, are extruded from the nozzle. The change of the rheological properties will swell the extruded geometry and reduce the deposited surface quality and structure. Thus, the swelling phenomenon of the visco-elastic fluid during extrusion has become...
In this paper, the hub motor driven pure electric vehicle as a prototype, side-slip angle and angular velocity as a controlled variable to design a path tracking controller based on adaptive terminal sliding mode. Through the simulation it can be the design of the adaptive control method based on terminal sliding mode can ensure the vehicle driver's action in 1s after completion of rapid response...
In this paper, the vehicle two-degree of freedom suspension model is taken as the system dynamics model to study the semi-active air suspension system. The sky-hook suspension system is selected as the reference model. Based on the error equation of the body motion, a sliding mode controller is designed by using isokinetic approach law. The traditional sliding mode control uses the switching function...
It is widely known that particle swarm optimization (PSO) has some drawbacks, especially it loses diversity easily. In order to solve this problem, some improved PSOs were proposed which update velocity according to diversity. However, some important information about particles is still not sufficiently utilized such as fitness values. As a gradient descent method, backpropagation (BP) algorithm is...
In order to reduce the computational complexity and computational time for the non-linear quasi-electrostatic problems, the reduced order finite element model based on proper orthogonal decomposition (POD) and discrete empirical interpolation (DEIM) is proposed. The presented reduced order algorithm is applied to compute the electrical field distribution in the winding end of a type of ±500kV converter...
In the design and optimization of quartz crystal resonators, the finite element method has been adopted for the analysis of quartz crystal plates with complications for the vibration frequency and mode shapes. Further extension of such analysis can be made by using complex solutions to extract the electrical parameters of quartz crystal resonators because it is a typical electronic component in circuit...
In this paper, a fractional-order control (FOC) based approach is proposed for piezo-actuated nanopositioning stage. The developed controller is not only to suppress the vibration of the low-damped resonant mode, but also to minimize the tracking error for nanopositioning applications. Firstly, an inverse hysteresis compensator is utilized to compensate for the inherent hysteresis nonlinearity of...
The capital structure remarkably determines the debt paying and refinancing capacity of an enterprise and then influences the future earning level. In this paper, firstly we analyze the conditions and characteristics of the capital structure of 24 listed companies in Hebei Province through the related data from 2006 to 2015. Then, we examine the mainly micro-factors to capital structure by the empirical...
A novel approach based on an optimization method is developed to deduce the rules of learning human thermal comfort states. In order to achieve a desired thermal comfort level and energy savings, the study constructs a mechanism with varied control strategies by using the deduced rule set. The proposed method is superior to other indoor thermal comfort based controls in that it produces interpretable...
Rotational speed monitoring is a critical part in the automatic control system of large generators and centrifugal machine. This article designed a rotational speed measurement system using electrostatic sensors and a correlation signal processing method. Two categories were utilized for the speed measurement-two sensors using cross-correlation method and a single sensor using auto-correlation method...
The thrust system of TBM propels the cutter head boiling forward and the strong impulse loads on propelling cylinder cause serious vibration problems. Based on the typical thrust system which the thrust cylinders are controlled by pressure reducing valves, the paper obtained the dynamic velocity stiffness, static velocity stiffness, minimum velocity stiffness of the thrust cylinder. According to the...
“Data century has arrived! Having too many applications to discrete mathematics rather than use continuous mathematics, the method instead of using analog to digital methods. The vector and matrix has become the language which we must speak up.” says the author of the professor named Gibert, S. Linear algebra is a branch of mathematics that studies the object is a vector, a vector space (or linear...
In this paper, a solution to the double curl equation with generalized Coulomb gauge is proposed based on the vectorial representation of the magnetic vector potential. Coulomb gauge is applied to remove the null space of the curl operator and hence the uniqueness of the solution is guaranteed. However, as the divergence operator cannot act on the curl-conforming edge basis functions directly, the...
The convolutive blind source separation (BSS) problem can be solved in frequency domain. To solve the permutation ambiguity problem in frequency domain, this paper presents an improved permutation alignment algorithm. According to features of radar signals, first the frequency domain is divided to some region segmentations. Then the permutation alignment is performed in each region independently....
This paper describes a new technique for simulating the guidance of a SAM (surface to air missile) without the help of a controller. This analysis is fully automated in a closed loop using the features of commercial software MATLAB. The guidance algorithm is simulated with the help of aerodynamic data. Control law is not used for obtaining the desired deflections of the control surfaces rather reverse...
In this paper, a full-wave semi-analytical solution of self and mutual impedances for a coil-based system is proposed. It consists of two concentric circular coils with rectangular cross sections. Traditionally, the calculation of self and mutual impedances of these coils are based on eddy current approximation, where a simple background is assumed to achieve analytical and semi-analytical solutions...
In this paper, a novel approach is proposed for shape classification based on the semi-supervised framework. For shape similarity-measuring problem, in order to avoid solving an NP problem produced by finding some affine transformation and to enhance its robustness for local changes of the shapes, we switch to compute an energy index defined by the degree of segmentation. The corresponding segmentation...
This paper proposes a mathematical model of the three-phase four-switch pulse width modulated (PWM) voltage-source recti??er (VSR) based on direct power control (DPC). The derived model has the advantages of specific physical meaning, more versatile and precise, and most nonlinear control strategies of six-switch VSR could be utilized for four-switch VSR. By analyzing the proposed model, the dynamic...
To reduce the tracking errors caused by high-speed motion and variable motion in the process of moving target tracking, a novel Mean-Shift tracking algorithm based on Kalman filter using adaptive window and sub-blocking is proposed in this paper. Moving target's utmost position is predicted by combining Kalman filter and historical information, which is used as the initial position. During describing...
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