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In order to solve the problem that super-high pressure compressor pipeline system had serious vibration and noise pollution, finite element method was used in this paper to have system vibration analysis and a vibration control program was designed by changing system inflexibility. On the other hand, in order to improve the efficiency of simulation modeling, the ANSYS parametric design language (APDL)was...
In this paper, the experimental research on the tool failure mechanism using YG6 and PCD tool cutting Particular Reinforced Metal Matrix Composites (PRMMCs) with ultrasonic cutting and common cutting was carried out, and it was discovered that: (1) the tool wear of ultrasonic cutting is less than that of common cutting, the cutting speed and feed speed have greater effect on tool wear and the cutting...
The failure of energy recovery with descending of regular hydraulic excavator's boom causes heat release problem, disfunction, and accelerated wear. According to this issue, this paper proposes a hydraulic excavator boom potential recovery system based on accumulator-hydraulic motor-generator. The accumulator of the system stores potential energy from construction of boom hydraulic cylinder through...
A 2.0L nature aspirate gasoline engine was modified to port fuel injection (PFI) hydrogen internal combustion engine (HICE) and a series dynamometer tests were carried out. The in-cylinder combustion process was analyzed, the performance, thermal efficiency and emissions of HICE with various mixture eqivalence ratios was summarized. The experimental results showed: While 20~25% lower torque compared...
By periodic variation of electric field, the converse piezoelectric effect of piezoelectric ceramics can generate vibration of vibrating rod, which drives the liquid to jet from nozzle outlet and becomes discrete micro droplets. A device of micro-droplet jetting was built based on this principle in this paper. The mechanism of formation of liquid droplets was discussed and jetting tests were performed...
Knowing about the distribution of gas pressure in coal seam is significative to study the flow of coal seam gas, the occurrence and the change of dynamic phenomenon. An in-situ detection is used to detect the in-situ occurrence of gas in No.3 coal seam in Sihe coal mine of Jincheng Anthracite Mining Group in Shanxi province. The distribution of gas pressure around the holes and the change of the content...
To build up integral SL system, a control system of vertical moving stage in the Integral SL system is established. The control system consists of small power stepper motor, movement control cards, driver of stepper motor, precision ball screw, linear guide. The motion accuracy of vertical moving stage in integral SL is an important factor which influences the building accuracy of the SL system. To...
The inverse model of system is constructed based on the off-line identification of SVM (support vector machine), and online SVM control is used into an approximate pseudo linear system, which is composed by the inverse model and the original nonlinear system, in order to reduce the nonlinear traits of system. In addition, a compound control of online SVM control and Fuzzy PID control is presented...
The flow of air entering engine cylinders is controlled by the electronic throttle, which is an important part of automotive engines and has a direct effect on the fuel efficiency and the security of automobiles. For the demand of quality sampling, an electronic throttle performance test system, which met the manufacturers' requirements, was designed to achieve the test of the opening performance...
Multi-body simulation modeling is very important in simulation and optimization of products. Considering the problem of rapid modeling in multi-body simulation, the method of dynamic modeling based on inheriting and transforming is presented. For inheriting the dynamic constraint information of the multi-body simulation model, topological configuration of the multi-body simulation model is built,...
The disadvantages of modeling methods about current network manufacturing resource were analyzed. According to characteristic of UDDI(Universal Description, Discovery and Integration)and WSIL(Web Service Inspection Language), a kind of modeling method about meta-model based on basic feature was put forward and the defines of meta-model were given. Ontology and code were introduced into the meta-model...
This paper focuses on a case study on dynamic characteristics analysis and dynamic stiffness evaluation of a reconfigurable turn-milling machine tool. The structural dynamics analysis and evaluation on CNC machines, which has become one of the utmost technologies to resolve vibration problems, is frequently applied for detecting machine anti-vibration property and evaluating vibration analysis accuracy...
Nowadays, embedded system is one of most popular and promising fields of IT applications, and embedded technology will be more extensive development. ARM processor becomes a mainstream processor in the embedded system because of the characteristics of high cost and low power cost. A video acquisition system using ARMS3C2440 microprocessor is designed, and the entire functional module based on V4L...
This paper presented a machine vision system with a color linear CCD to identify several China wheat classes. However, these images were deformed due to color linear CCD itself, image noise and uneven brightness also existed. The image needs to be corrected so as to segment the wheat features better. Algorithms of linearity equation were developed to correct geometric distortions, homomorphic filtering...
A methodology based on high speed cutting experimental test and observational methods for analyzing wear course of coated tool in milling cast iron and quenched and tempered 45 steel by coated cemented carbide inserts is introduced. The applied coatings were TiCN and TiAlN films. The geometrical model of coated tool abrasion is offered and analyzed all possible abrasion morphology of coating. Stress...
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