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Analysis and Research of Friction and Wear Mechanism Based on Different Types of Dynamic Load
Liguo Zhang,
Wei Yuan,
Xingcan Wang,
Hao Li,
Qianjian Guo
Issue:
Volume 5, Issue 3, September 2020
Pages:
57-63
Received:
19 June 2020
Accepted:
28 June 2020
Published:
6 July 2020
Abstract: For sliding friction pairs formed by differential gears and gaskets, it is necessary to study the friction performance under the coupling of multiple working conditions (impact, vibration and alternating load). For example, it is of great significance to study the performance of sliding friction pair in the rear axle differential of truck and the friction and wear performance of the internal parts of aircraft and ships under the coupling condition of multiple working conditions, so as to obtain longer service life and excellent performance by improving the friction performance. The ball-disc pairs were experimentally built to simulate the friction and wear mechanism of materials under different types of dynamic loads. Under the condition of non-polluting white oil lubrication, increased the contact ratio of the pair, and made the pair reach the experimental state of no dynamic pressure lubrication, selected different types of dynamic loads (step load, damped harmonic excitation load (DHE), Short-term high load) loading method. During the experiment, force sensors and online visual ferromagnetic sensors were used to monitor friction and wear rate signals in real time, and TR200 profilometer and scanning electron microscope were used to observe and study friction characteristics. The results show that a reasonable step load can improve the friction and wear state of the ball-disk pair during the running-in period and reduce the peak wear of the surface contact portion of the pair of materials. The main wear form of the experimental pair under constant load and step load for plastic flow and squeezing deformation, the fatigue of the surface material is caused by the high frequency fluctuating load of DHE. Therefore, it is concluded that the step load has an effect on improving the friction and wear performance of the mating pair, and the DHE load has a damage effect on the mating pair.
Abstract: For sliding friction pairs formed by differential gears and gaskets, it is necessary to study the friction performance under the coupling of multiple working conditions (impact, vibration and alternating load). For example, it is of great significance to study the performance of sliding friction pair in the rear axle differential of truck and the f...
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The Characteristics of Production Process and the Designning of Automatic Blending System of the Traditional Chinese Spirit
Jianwu Yu,
Fangxing Wu,
Hao Wang,
Hongbo Li,
Xiaoyue Zhang,
Yonlin Huang
Issue:
Volume 5, Issue 3, September 2020
Pages:
64-69
Received:
7 June 2020
Accepted:
6 July 2020
Published:
5 August 2020
Abstract: The Production process of the traditional Chinese spirit is substantially different from beer brewing. Traditional Chinese spirit is produced with sorghum as main raw materials, and mold-based koji as the glycosylation and fermentation agent. The intense-flavor type spirit is an exotic flower in traditional Chinese spirit. It’s brewing is an extremely complicated process named continuous slag fermentation. It is characterized by simultaneous steaming and distillation of the mixture of fermented grains and fresh raw materials, and repeated glycosylation and fermentation of the steamed feedstock in solid state in the mud pit. Due to the complexity of the fermentation micro flora and their metabolites, the flavor compositions in the spirit produced from different batches are large different. The proportion of various chemicals in the spirit is large different. This necessitates the development and application of automatic blending system which can improve the blending efficiency and consistency of product quality of the traditional spirit. The automatic control system of brewing and blending is convenient for the production optimization analysis of technologists and provides a strong guarantee for exploring the optimal production parameters. Today most large scale distilleries begin to use the automatic blending control system to improve production efficiency and production capacity.
Abstract: The Production process of the traditional Chinese spirit is substantially different from beer brewing. Traditional Chinese spirit is produced with sorghum as main raw materials, and mold-based koji as the glycosylation and fermentation agent. The intense-flavor type spirit is an exotic flower in traditional Chinese spirit. It’s brewing is an extrem...
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Analysis of Anharmonic EXAFS Spectra of Crystalline Nickel Using High-order Debye-Waller Factors
Tong Sy Tien,
Le Viet Hoang,
Nguyen Ngoc Thang,
Bui Ba Manh,
Nguyen Huu Hieu,
Nguyen Thi Ngoc Anh,
Duong Thanh Cong,
Nguyen Hong Nhung,
Nguyen Thi Thanh Nhan
Issue:
Volume 5, Issue 3, September 2020
Pages:
70-74
Received:
25 June 2020
Accepted:
14 July 2020
Published:
5 August 2020
Abstract: The extended X-ray absorption fine structure (EXAFS) has been developed into a powerful technique and is widely applied to determine many structural parameters and dynamic properties of materials. The EXAFS technique is now the technique of choice in many materials science investigations, and the EXAFS data analysis is being performed in many laboratories spread around the world. In this work, the anharmonic EXAFS spectra of crystalline nickel (Ni) has been analyzed based on the quantum anharmonic correlated Einstein model. The anharmonic EXAFS oscillation presented in terms of the Debye-Waller factors using the cumulant expansion approach up to the fourth-order. This calculation model has been developed from the high-order anharmonic effective potential that described the contribution of their nearest-neighbor atoms to the pair interaction potential. The analytical expressions of the anharmonic EXAFS cumulants are not only explicit forms but also satisfy all of their fundamental properties in temperature dependence. The analysis of the anharmonic EXAFS spectra was performed by evaluating the contributions of the cumulants to the amplitude reduction and the phase shift of the anharmonic EXAFS oscillation. The numerical results for Ni were in good agreement with those obtained using the other theoretical methods and experiment at various temperatures, which are useful for analyzing the experimental EXAFS data of the metal crystals.
Abstract: The extended X-ray absorption fine structure (EXAFS) has been developed into a powerful technique and is widely applied to determine many structural parameters and dynamic properties of materials. The EXAFS technique is now the technique of choice in many materials science investigations, and the EXAFS data analysis is being performed in many labor...
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Research on the Impact of Environmental Regulation on Technological Innovation of Paper Industry Based on Gray Analysis Method
Donghong Shan,
Chunxia Shan
Issue:
Volume 5, Issue 3, September 2020
Pages:
75-81
Received:
16 August 2020
Accepted:
28 August 2020
Published:
17 September 2020
Abstract: In recent years, the continuous development of economy has also promoted the vigorous development of China's paper industry, but the disadvantages of paper industry such as large water consumption and serious pollution are more prominent. Therefore, the government has formulated a series of environmental regulation policies to restrict the heavy pollution in the production process of paper industry. Research on the impact of environmental regulation on the technological innovation of the paper industry in the new era is conducive to improve the quality policy of environmental supervision of China's paper industry, which has good theoretical value and practical significance. The data in this paper are from a series of indicators of the paper industry from 2009 to 2018. Among them, the indicators to measure the level of technological innovation and the indicators to calculate the intensity of environmental regulation are selected. The relationship between the two is empirically analyzed by grey correlation method and regression analysis. The empirical results show that environmental regulation has a positive impact on technological innovation of China's paper industry.
Abstract: In recent years, the continuous development of economy has also promoted the vigorous development of China's paper industry, but the disadvantages of paper industry such as large water consumption and serious pollution are more prominent. Therefore, the government has formulated a series of environmental regulation policies to restrict the heavy po...
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A Comprehensive Prediction Model of Rock Strength and Its Application on Classifying the Rock During the Drilling
Lu Yang,
Yinan Guo,
Cancan Liu
Issue:
Volume 5, Issue 3, September 2020
Pages:
82-87
Received:
10 September 2020
Accepted:
21 September 2020
Published:
29 September 2020
Abstract: Geological data plays an indispensable role in mining coal safely and efficiently. Traditional rock core method not only have some defects of high labor intensity, high cost and slow speed, but also difficultly got the rock of the weak interlayer. Based on this, parameter-based identification method of the rock characteristics during the drilling operation is a hot research topic. In this paper, a comprehensive prediction model was established to predict the rock Uniaxial Compressive Strength (UCS). Besides, the prediction results of the comprehensive prediction method, multiple linear regression model, and Mechanical Specific Energy (MSE) model were compared. Furthermore, the K-means clustering method is used to classify the rock formation based on the measured drilling parameters. The result indicates that torque work is significantly correlated with the UCS of rock. The comprehensive method has the best prediction result, and the prediction error of rock's UCS is within 5MPa. The prediction results of rock classification are different from the actual results, but from the perspective of rock strength, this classification method is better. The rapid identification method of rock formation based on MWD provides a reference for the roadway support scheme and parameter design, and is an important part of the intelligent development of coal mines.
Abstract: Geological data plays an indispensable role in mining coal safely and efficiently. Traditional rock core method not only have some defects of high labor intensity, high cost and slow speed, but also difficultly got the rock of the weak interlayer. Based on this, parameter-based identification method of the rock characteristics during the drilling o...
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Assessment of the Mechanical Properties of Marble and Granite Dust-High Impact Polystyrene Composites
Mohamed Mohamed Karbous,
Ayman Abd El Wahab,
Ramadan El Gamasy,
Mohamed Hazem Abdellatif
Issue:
Volume 5, Issue 3, September 2020
Pages:
88-96
Received:
25 August 2020
Accepted:
10 September 2020
Published:
22 October 2020
Abstract: Experimental work has been carried out to study the effect of adding marble and Granite dust (MGD) on the mechanical properties of high impact polystyrene (HIPS). The selected wt.% of MGD was 10, 20, 30, 40, 50 and 60. MGD was chemically treated by adding 2 wt.% stearic acid in an attempt to prevent agglomeration of the dust particles. Mechanical tests were conducted according to the ASTM standards to assess the bending strength and impact strength for both treated and untreated MGD-HIPS composites and also, Vickers hardness test was carried out. SEM analysis was also performed to interpret the results achieved throughout different tests. Surface modification of MGD particles using stearic acid caused better dispersion of MGD particles which lead to reduced agglomerations and this was observed through the SEM micrographs. Bending and impact strength of MGD-HIPS composite decreased by the increase of MGD content in the treated and untreated cases. On the other hand the increase of MGD content resulted in the increase of the surface hardness of treated and untreated MGD-HIPS composites. Surface treatment of the MGD particles using stearic acid had a greater effect on the surface hardness of the composite as the treatment allowed the production of a 70 wt.% MGD-HIPS composite plate which lead to an increase in the surface hardness of the composite by 130% compared to pure HIPS.
Abstract: Experimental work has been carried out to study the effect of adding marble and Granite dust (MGD) on the mechanical properties of high impact polystyrene (HIPS). The selected wt.% of MGD was 10, 20, 30, 40, 50 and 60. MGD was chemically treated by adding 2 wt.% stearic acid in an attempt to prevent agglomeration of the dust particles. Mechanical t...
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