The machining quality and cutting ability of the machine depends largely on the dynamic characteristics of the machine tool spindle bearing system. In this paper, the author will use the ANSYS finite element software to analyze the dynamic characteristics of the high speed milling motorized spindle,...

Based on the model reference adaptive system(MRAS), this paper makes a research on sensor-less vector control system of PMSM .The basic principle of MASR is analyzed, and the MRAS speed identification system of permanent magnet synchronous motor is designed. The control system model is simulated and...

Extreme learning machine (ELM) is a simple and effective feedforward neural network. It can be used in pattern recognition. But its classification ability is not good enough. In order to solve this problem, this paper proposed an improved firefly algorithm and used it in the parameters selection of ELM....

For the integrating combination problems of performance and reliability on ship products, the collaborative design architecture of multi-characteristics of ship mechanical and electrical products is researched. And on the case of integration design of ship steam turbine performance and reliability, the...

In order to study the NC machining technology of special geometry part, a dodecahedron part was trial-manufactured with CNC milling machine. First, the part was designed with UG software. Next, by analyzing the structural characteristics and requirements of the part, the process scheme was developed...

In order to research electronic balance application in PM2.5 ~ PM10 particle "weighing method" detection. This article studied operational principle and relative merits of 3 common detection methods including TEOM analytic method, beta-ray analytic method and weighting analytic method for PM2.5 ~ PM10...

Aiming at the problem that the machining accuracy of rectangular thin-walled parts are difficult to ensure because of poor rigidity and machining deformation which is easy to produce extremely, it used the three-dimensional finite element method and did analysis and calculation of rectangular thin-walled...

Collision resistance is one of the most desired properties for a cryptographic hash function. However, in the literature, there're some insufficient "black box" measures for evaluating collision resistance, which couldn't even distinguish some simple hash functions. In this paper, an improved "black...

In order to measure thrust of the micro-turbojet engine accurately, a new type of thrust measurement system was designed. The measuring system includes test bench, load cells, data acquisition modules and computer. The test bench utilizes a suspended test bed, which is different from the test bench supported...

In order to study the influence of steel fiber ratios on RPC flexural fatigue life, this paper obtained flexural fatigue loading times of RPC with different steel fiber ratio through flexural fatigue test. The results show that the fatigue property of RPC with steel fiber is improved significantly compared...

The article presents a unified description of the onboard equipment model for building simulation modeling infrastructure based on the international "Simulation Model Portability" (SMP2) standard. The model contains structural- parametric and functional description of the elements determining its composition...

This paper analyses the status of automatic test technology and the testing of power quality monitoring devices, and a set of power quality standard source controlled interface program is developed according to the characteristics and requirements of test performance. Based on the integrated development...

Based on the curing mechanism of soil stabilizer, use 'Toogood'soil stabilizer to solidify soil and study the curing effect. To obtain the best curing agent stabilized soil mixing ratio, this paper analyzed the soil particles, the compaction test and unconfined compressive strength test. Mix in the best...

We investigated 18XH3MA-SH steel, hardened by electrolytic-plasma treatment. Scanned surface transient analysis showed that during the electrolytic-plasma chemical modification of the surface heating occurs together with details of the release.

Based on the design of the complex super high-rise architectural structure of Fuyou Twin Towers in Binzhou City, this paper introduces the principles for structural layout, structural calculation and determination of key parts of the project and gives the relevant calculation and analysis results. The...

In view of the 750kV transformer that has high voltage, high insulation level, and heavy load all the years.This paper analysis the monitor data to obtain characteristic parameters which can reflect the transformer healthy conditions. On the basis of traditional Grey target theory, It uses the improved...