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...

In this research, we conducted the Sweden game and described its educational effect. The Sweden game is one way to determine cost-sharing for the construction of a pipeline. Three groups of about 40 students were used, with each group consisting of six teams. A good solution was obtained. Additionally,...

Compared with traditional text classification, many sentiments online such as product reviews are not standard, which are concise with clear standpoints. Researchers on sentiment classification face tremendous challenges. Although various sentiment analysis systems are available, they have many operation...

Although many efforts have been done on Massive Open Online Courses (MOOCs) contexts, how to understand the behavior and intention of individuals is a key issue in MOOCs. This article focuses on a review of both behavior and intention concerning MOOCs from science citation index expanded (SCI-EXPANED)...

The study constructs a framework for a multi-screen marketing platform through comprehensive analysis of theory and practice, the model provides practical insights and strategies to help marketers successfully deliver against business goals, while they implement the application of artificial intelligence...

This paper presents a new study of artificial intelligence applications through the simulation of improved control strategy to provide the mitigation concepts and formulate preventive actions for aircraft operation. The fuzzy-logic modeling (FLM) technique is used to establish flight control models with...

The traditional collaborative filtering algorithm cannot response user interest with time and is lack of time effectiveness. These problems lead to poor recommendation quality. On the basis of the neighbor-based collaborative filtering, a fused method of improved similarity and user interest is proposed....

There is a rapid growth of interest in understanding Enterprise Social Media (ESM). This article focused on a review of this topic from science citation index expanded (SCI-EXPANED) and Social Sciences Citation Index (SSCI) database on web of science. Research results indicated that (1) the number of...

Efficient location of medical services is an issue of paramount importance in healthcare strategic planning. In this research, a mathematical model is developed for the location of multi-service health centers assuming probabilistic demand and service time. Since patients may be shifted to another service...

A digital 3D scanning technique for human body is proposed. Firstly, feature point recognition is carried out on point cloud model of 3D sweeping human body. This method adopts the more mature random forest algorithm, and the algorithm has higher recognition effect. Then, based on the recognition of...

In the wave of marketization reform, the tobacco industry has been gradually transforming to the market-driven planning model from fully planned economic model. In the tobacco market demand forecast, multiple reasons have been showing impact on each other like industry's own growth, seasonal fluctuations,...