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Du B.,Key Laboratory of Advanced Forging and Stamping Technology and Science | Zhao C.,Key Laboratory of Advanced Forging and Stamping Technology and Science | Dong G.,Yanshan University | Ya Y.,Key Laboratory of Advanced Forging and Stamping Technology and Science
ICIC Express Letters | Year: 2014

Considering the limited forming force and oil leakage problem in the process of the hydraulic bulging, solid granule medium forming technology was used to meet the need of forming high precision thin-walled tube. The advantages of forming these parts by using the solid granule medium forming process are analyzed. Adopting Drucker- Prager yield model, numerical model of solid granule medium forming is developed. The matching relation between the tube axial force and the medium loading force by simulation is discussed. Compared with experimental results, the feasibility of Drucker-Prager model in the simulation of solid granule medium is confirmed. © 2014 ISSN 1881-803X.


Zhao J.,Key Laboratory of Advanced Forging and Stamping Technology and Science | Zhao J.,Yanshan University
ICIC Express Letters | Year: 2014

Stock market prediction is utility important in the economic system. With the rapid development of economy, stock data is becoming increasingly complex. This paper presents a new method using the principles of wavelet transform and wavelet denoising to de-noise the stock data, and then the improved Auto-Regressive Integrated Moving Average (ARIMA) model is used to predict the future trends of stock data. The presented model is compared with some other classical forecasting methods such as ARIMA model method, BP model method and the method proposed by Dai. The results tested with data indicate: this forecasting method introduced in this paper can realize multi-step prediction and the forecasting accuracy is higher than that of stock data which is predicted by the ARIMA model or the other forecasting model. © 2014 ICIC International.


Zhao J.,Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control | Zhao J.,Key Laboratory of Advanced Forging and Stamping Technology and Science | Zhang C.,Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control | Zhang C.,Key Laboratory of Advanced Forging and Stamping Technology and Science | Liu W.,Yanshan University
ICIC Express Letters | Year: 2015

In this paper, a stress function which meets both the biharmonic equations and boundary conditions are constructed in the three-dimensional space. Furthermore, the solution of a suspension cylinder subject to cosine distribution pressure on its inner and outer surfaces and normal stress on both ends are deduced. When strain values of cylinder are recorded by static strain tester on suspension cylinder, the experimental results are in accordance with the theoretic calculation. The analytic solution paves the way for the mathematic building and solution of cylinder with randomly uneven pressure. © 2015 ICIC International


Kong X.,Key Laboratory of Advanced Forging and Stamping Technology and Science | Kong X.,Yanshan University | Luo H.,Yanshan University | Ai C.,Key Laboratory of Advanced Forging and Stamping Technology and Science | And 3 more authors.
ICIC Express Letters, Part B: Applications | Year: 2015

The cement coating machine is widely used, but it wastes a lot of energy when braking. In order to overcome the weakness, secondary regulation system is put forward to recycle energy. Firstly the secondary regulation speed control system is proposed. Then the mathematical model of hydraulic secondary regulation system is established, and efficiency calculation method is derived. At last, through the simulation analysis and experimental verification, the feasibility of energy saving project is proved. With bigger slope and lower hydraulic pressure, the system can recycle more energy. © 2015 ICIC International.

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