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In this paper, a new type of electro-hydraulic proportional control system with three way cartridge valve is proposed. By establishing its mathematical model and simulation model, it is compared with the control system of the high pressure unloading valve. It is shown that the control performance of the proposed scheme is better than the system of the high pressure unloading valve. With accumulator...
By use of French mesoscale non-hydrostatic numerical model Meso-NH, using two kinds of ice phase particles scheme: ICE3 scheme (no hail), ICE4 scheme (with hail), simulate the thunderstorm clouds charge structure, lightning flash rates to explore the impact of the hail process on the microphysical and electrical processes of the thunderstorm clouds. The results showed that: 1) ICE4 scheme of thunderstorm...
In this manuscript, a systematic detail on the approaches and considerations for producing a Computational Fluid Dynamics simulation model of palm oil expression using screw press is presented. The behavior of oil palm fruitlet components (fiber, nut, and oil) during oil extraction process will be investigated for a deeper understanding on the process since manual observation is difficult as the screw...
In this paper, we propose a new error criteria for determining the optimal multi-channel model system. The error criteria is based on assuming that the probability density function of the resulted error signal is t-distributed with α degrees of freedom. A small weighting factor is assigned for large amplitude signal portion parts and large weighting factor is used for small amplitude signal portion...
A dynamical model with multi perturbation factors of unwinding tension was established by analyzing the web press experiment platform. A tension control simulation system was constructed whose actuator is a magnetic powder brake by using MATLAB. A fuzzy adaptive PID controller was designed, and compared with the traditional PID control through experiment. The results show that the fuzzy adaptive PID...
Because of its good speed regulation performance and control performance, DC motor is still widely used in many fields. Currently, in the field of the DC Speed regulation, the pulse width modulation speed control technology is developing rapidly, and has very broad application prospects. In this paper, PWM DC Speed Regulating System Design are researched and discussed, including designs of PWM power...
The advent of IEC 61850 provided generic hardware platforms with a standard communication interface and left remaining problem is the unified function model that can specifies various software components and provides a framework to integrate them efficiently. The standard function blocks method can provides the unified function model. In this paper we report on the architecture specifies a design...
In order to characterize tension and establish control strategy of web press, a precise dynamical model of winding tension is established by analyzing a shaftless multiple unit web press experiment platform. Several simulation models are developed based on MATLAB which are winding tension module, diameter real-time calculation module, taper tension reference value module and servo motor module. A...
The high accuracy hydraulic static pile driver leveling is a important factor to guarantee the construction efficiency and pile quality, to meet the high accuracy of fuselage leveling during construction process, this paper analyzed the structure of body platform, and confirmed a scheme of leg movement for body leveling, and validated the rationality of the scheme by Matlab simulation.
Taking the Woodward's UG-25plus electro-hydraulic governor for research object, this paper established mathematical model of the electro-hydraulic speed governing system of diesel engine. By means of simulink simulation, analyzed the main factors which affect dynamic characteristics of hydraulic actuator, emphatically Analyzed influence of damping ratio, natural frequency and flow gain of servo valve...
Regulator is a common electronic device used to output stable voltage when the grid voltage fluctuate and load changes. The simulation and analysis of the series voltage regulator design based on Multisim 10 simulation software can help locating faults and shorten the design time, and provide an effective way to design series voltage regulator.
The paper introduce structured grid division, use CFD numerical simulation and FLUNET software to conduct the simulation calculation for flow field of high-speed vehicle, which study the clamps of high-speed vehicle control helms how to affect the lift-drag characteristics of it. To better illustrate the problem, we use the canard configuration vehicle that efficiency of control is higher. This paper...
The method of Self-Organizing Configuration Design (SOCD) for vehicle leaf-spring can lessen the complexity of process and improve the accuracy of calculation. In order to realize a rapid parameter solving in SOCD for vehicle leaf-spring, a method of parameter configuration is put forward based upon RBF (Radial Basis Function) Neural Network. Starting with problem description of parameter configuration,...
This paper aims to present a method to design the optimization steady state nonlinear controller of turbofan engine which is applicable for the whole flight envelop. First, based on the linear small deviation mathematical models of some representative operation points of turbofan in various flight conditions, the linear quadratic regulators of turbofan are designed respectively and the optimization...
This paper introduces the simulation method of the ballistic missile control system for precision analysis, analyzes the influence mechanism of the ballistic missile control system error on the missiles's impact point, constructs simulation model to control the system accuracy, and on the basis carries out the simulation calculation of the model and analyzes the result.
The subjective evaluation of chassis handling and comfort, tuning activities and methods are introduced in this paper. Also the chassis tuning necessity and solution planning of tuning sample are described. Moreover, the main factors to adversely affect chassis handling and comfort are discussed. The chassis tuning can be performed by a combination of simulation and theoretical analysis.
Base on the comprehensive analysis of the structure and existing problems of gear pump, the paper provided the structure principle of synchronous gear pump. The discussions focus on the working principle, construction features and mesh-force simulation of the gear pump. The research indicates that the new pump has such advantages as lower noise, better distributed flow and a high work pressure. It...
This modeling and simulation on a automatic pendular telescopic coal flowing equipment are introduced here based on the software Pro/E. There are five main components' modeling included the train and the railway are given through this software. Using the software, the simulated assembling is provided, and the moving relation is established about the practice working state. The reasonable drivers are...
The composition and working principle of sampling device is given, establishing the mathematical model. In view of the actual developed structure, the simulation calculation has carried according to actual value of corresponding system parameters. Simulation results is consistent with the experimental data and verified the correctness of the mathematical models. The influence of the start and stop...
In this paper, the electromagnetic compatibility (EMC) of the printed circuit board (PCB) is discussed and the system design method of EMC is put forward. First, the electromagnetic interference (EMI) of the PCB is analyzed and the design process of EMC is raised. Then, we use the Ansoft Designer based on method of moments (MoM) to simulate the PCB and obtain the near field plots. According to the...
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