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This paper compares the characteristics of the numerically controlled systems of the parallel machine tools and the traditional ones. Based on an open numerically controlled platform, a method of developing the numerically controlled system of a parallel machine tool is proposed. So long as the numerical program is embedded into a mature numerically controlled platform as a functional module through...
In order to reduce the design difficulties, the input sample-and-hold amplifier (SHA) is often removed in the nested background calibration of the CMOS pipelined analog-to-digital converters (ADC). The system uses a dual-channel LMS adaptive digital background calibration algorithm, and the reference ADC was calibrated in the foreground. Without the input SHA, the sampling-time error between the two...
The time-interleaved analog-to-digital converter is an efficient approach to systems requiring very high sampling rate with medium to high resolution. However, the inter-channel mismatch and process variations introduce additional errors as compared to single-channel ADC, which results in degradation of the ADC performance. The mismatches include gain, offset and timing, among which the timing errors...
The governing equations are introduced for the viscous incompressible Newtonian fluids, in which the three-dimensional mathematical models of gas-liquid two-phase flow are established for gas-assisted injection molding (GAIM). The flow process of GAIM is simulated by coupling the level set method and the finite volume method based on non-staggered grid, which can precisely capture the gas-melt interface...
Free bending with no bottoming is commonly applied in various industrial productions because of its versatile forming characteristics. And full application in the large-diameter longitudinal welded pipes production shows the superiority of this forming method. This paper adopts a scientific experimental design method to carry out physical modeling and simulation study on the wide-plate air bending...
The dual-objective optimization of surface discussed in this paper means that the optimal surface is not only smoothing but also corresponded to the shape of the back of the body. Since surface can be built with family of curves which are optimized with the same two objectives, the mathematical model of surface's constructional curve is critical to the success of dual-objective optimization of surface...
The Fuzzy C-Means (FCM) algorithm is commonly used for clustering. The weighting exponent tn and the clustering number C are the important parameters in FCM algorithm. Conventional fuzzy clustering method must use both of the two prespecified parameters, so in this paper we analyses the original algorithm and studies on the optimal selection methods of the m and c by introducing the fuzzy decision...
The authors have adopted a time delay control method to roundly analyze vehicle dynamic capability equipped with four wheel steering based on close-loop driver vehicle system, especially, driver's steering behavior tends to become more discontinuous while performing an activity during driving. The single-loop quasi-linear driver steering model can certainly be applied to modeling of a 5 DOF vehicle...
Electric Power Steering (EPS) systems have many merits over traditional hydraulic power steering systems in fuel economy, variable assist capabilities and favorable road feeling by virtue of adjustment assist characteristic with adopting assist motor in replacement of hydraulic pump. This paper aims at modeling the mechanical parts, the assist motor and electronic control unit by bond graph technique...
In this paper, we propose a yaw moment control based on fuzzy-logic controller to enhance the vehicle stability. A two-degree-of-freedom nonlinear model of the considered vehicle is briefly presented. The feedback of the yaw rate and sideslip angle are regarded as inputs of the controller. The developed controller generates the suitable steering angle so that the vehicle follows the target values...
The closed-loop system using time optimal synthesis function has characteristics of fast convergence and nobuffeting. This paper brings forward a new electromechanical actuator control system which uses time optimal synthesis function to complete the design of control law and nonlinear state tracking feedback. The simulation results and experiments on motor servo loading system show that the controller...
To enhance yaw stability of the vehicle with Active Front Steering System, a vehicle two-degree-of-freedom simple model is set up. The feedback of the yaw rate is regarded as an input; we propose a yaw moment control based on fractional-order PID controller, and parameters in-line setting in the process of control is realized. The developed controller generates the suitable yaw moment so that the...
This paper proposes a surface optimization method on ergonomics and surface fairing in the process of product design. First, build constructive curves and surface by the key ergonomics points which had been measured. Secondly, establish the optimization mathematic model of curves and surface by energy method. Then, define the penalty factor in order to change the constrained optimization into the...
This text advance the method of automatism capture the engineering parameter in figure using computer, thread conversion and account the coordinate, capture the engineering parameter in figure, can frank capture the engineering parameter in curve from figure, especially for experience figure, capture the engineering parameter is achieve nicety and effective.
This paper has investigated the cab styling of heavy-duty truck with a low air drag based on aerodynamics and aesthetics. It focuses on the relationship of air-deflector, trailer and drag through an example of air-deflector styling. The parameters, the angle of air-deflector and the height of trailer, are specifically discussed here. The gap between cab and trailer is fixed. A lower drag cab is presented...
In order to achieve the ability of primary frequency regulation better, the boiler-turbine coordinated control system for the large capacity unit has become an important research in thermal control field, using the mechanism mathematical model for reference, utilizing the method of pressure node, the dynamic simulation mathematic model of the coordinated control system for supercritical units is given,...
We developed a 3D parallel full band Monte Carlo simulator for semiconductor devices. This enables us to simulate 3D devices on high performance multiprocessor machines. By utilizing the JASMIN software package, parallel execution issues such as processors communication, grid partitioning and load balancing are handled easily and efficiently. The 3D MC simulator is validated by comparing its results...
Steering-by-Wire system has received lot of attention in the recent years because of the development of vehicle stability control systems and intelligent vehicle highway systems. The variable structure controller based on the reference model with a drive model is insensitive to parameter variations so that the available control authority and the effect of Steering-by-Wire system on vehicle yaw response...
Large-scale wind power integration brings about many challenges to power system. Energy storage is regarded as an effective solution to the problems and some demonstration projects have been constructed. As the output power of wind turbines is a stochastic variable which is determined by wind velocity, it is very difficult to choose the operation strategy of energy storage. Probability method can...
According to actual circumstance of Han Iron and Steel Company CSP, a three-dimensional mathematical model of fluid flow in the mould has been developed. The process of fluid flow is simulated in aid of fluid simulation software FLUENT, when we use two kinds of SEN separately in cast. The fluid flow in the mould is simulated at the difference of technical parameters (flow-guiding slot angle and submerge...
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