Analysis and Optimization of the Working Parameters of the Impact Mechanism of Hydraulic Rock Drill Based on a Numerical Simulation

Shuyi Yang,Yang-bin Ou,Yong Guo,Xian-ming Wu 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.7

An impact system is the core part of the hydraulic rock drill. The dynamic simulation model of the hydraulic impact system is established based on the system simulation platform AMEsim. We used the AMEsim simulation model to verify the displacement, velocity curves of the piston, and valve by using stress wave testing data. The following key features of the impact system are determined: the characteristic curves of the pressure variations in the piston chambers, the influences of oil flow, the charging pressures of the high-pressure accumulator, the pre-setting pressure of the relief valve on impact performance, and impact efficiency. On the basis of orthogonal experiments, a response surface method is used to build a mathematical model of the impact system with efficient and various working parameters. The impact system with an optimal efficiency is designed, and the working parameters are optimized. Our proposed system efficiency increases by 17.7% after the working parameters are optimized. This study provides a theoretical basis for the design and optimization of the impact system parameters of the hydraulic rock drill with a sleeve valve.

Pile-sinking force modeling and analysis of anti-pull impact pile driver

Shuyi Yang,Deshun Liu,Yaobing Sun 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.8

A "Rigid body - spring - rigid body - elastic rod - rigid body - spring - elastic rod" impact system dynamics model for an anti-pull impactpile driver is established based on the Newton mechanics and stress wave theory. In the developed model, the force, velocity, andstress curves are acquired by solving the dynamic equations. Influences of system dynamics parameters on the maximum pile-sinkingforce are discussed. Results show that mass and velocity of the impact hammer, stiffness of buffer spring and pile cap have significantimpacts on maximum pile-sinking force, while mass of transmission box and platen have less effects. In engineering applications, maximumpile-sinking force can be controlled by rational allocation and design of pile cap and platen’s stiffness. This work can provide someguidelines for the future product optimization design. As a result, impact performance pile drivers with much better can be designed.

Modified organic reagent for deeply purifying crude TiCl4: an in-depth study on key component and mechanism

Yang Shuyi,Xing Zhenqiang,E Tao,Liu Lin,Qian Jianhua 한국탄소학회 2022 Carbon Letters Vol.32 No.3

Organic reagent is considered as one of the most promising reductants for deeply removing vanadium (V) trichloride oxide (VOCl3) from crude titanium tetrachloride (TiCl4). Nevertheless, indeterminate active component and unclearly removal mechanisms appear to be the obstacles to separate VOCl3 from TiCl4 using organic reagent. Herein we conduct the experiment to explore it. Firstly, the organic reagents are obtained from enterprise (noted as EOR1–EOR7), and then it is determined that carbon aromatic (CA) is the active component for removing VOCl3. Furthermore, modified organic reagents (noted as MOR1–MOR4) are prepared via adding aromatic hydrocarbon oil and stearic acid to EOR7, then indicating that MOR3 is endowed with the best capacity to remove VOCl3. In addition, the residues obtained from distillation experiment are comprehensively analyzed (using X-ray diffraction (XRD), transmission electron microscope (TEM) and scanning electron microscope (SEM) etc.), revealing that porous amorphous carbon that deriving from MOR, plays an excellent role in removing VOCl3 from TiCl4 system. Therefore, the removal mechanisms can be explained like that porous amorphous carbon reduces VOCl3 into insoluble vanadium (III) chloride (VCl3) and vanadium (IV) oxide dichloride (VOCl2), and then they are separated via adsorption process, with the help of porous amorphous carbon.

The Attenuation Mechanism and Live Vaccine Potential of a Low-Virulence Edwardsiella ictaluri Strain Obtained by Rifampicin Passaging Culture

Wang Shuyi,Hao Jingwen,Yang Jicheng,Zhang Qianqian,Li Aihua 한국미생물·생명공학회 2023 Journal of microbiology and biotechnology Vol.33 No.2

The rifampicin-resistant strain E9-302 of Edwardsiella ictaluri strain 669 (WT) was generated by continuous passage on BHI agar plates containing increasing concentrations of rifampicin. E9-302 was attenuated significantly by 119 times to zebrafish Danio rerio compared to WT in terms of the 50% lethal dose (LD50). Zebrafish vaccinated with E9-302 via intraperitoneal (IP) injection at a dose of 1 × 103 CFU/fish had relative percentage survival (RPS) rates of 85.7% when challenged with wild-type E. ictaluri via IP 14 days post-vaccination (dpv). After 14 days of primary vaccination with E9-302 via immersion (IM) at a dose of 4 × 107 CFU/ml, a booster IM vaccination with E9-302 at a dose of 2 × 107 CFU/ml exhibited 65.2% RPS against challenge with wild-type E. ictaluri via IP 7 days later. These results indicated that the rifampicin-resistant attenuated strain E9-302 had potential as a live vaccine against E. ictaluri infection. A previously unreported amino acid site change at position 142 of the RNA polymerase (RNAP) β subunit encoded by the gene rpoB associated with rifampicin resistance was identified. Analysis of the whole-genome sequencing results revealed multiple missense mutations in the virulence-related genes esrB and sspH2 in E9-302 compared with WT, and a 189 bp mismatch in one gene, whose coding product was highly homologous to glycosyltransferase family 39 protein. This study preliminarily explored the molecular mechanism underlying the virulence attenuation of rifampicin-resistant strain E9-302 and provided a new target for the subsequent study of the pathogenic mechanism of E. ictaluri.

Crashworthiness design of bionic-shell thin-walled tube under axial impact

Lingyun Qin,Shuyi Yang,Hongzhou Li,Juchuan Dai,Guosheng Wang,Qihui Ling,Zhewu Chen 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.7

Bionic structures have been widely utilized in the crashworthiness design of thin-walled structures due to their superior energy absorption capabilities. This study constructed a bionic-shell thin-walled tube (BST) with excellent crashworthiness based on the structural bionic principle using the shell shape cross-section as the prototype. First, the theoretical model of the mean crushing force (MCF) for BST under axial compression was developed. An experiment was conducted and the reliability of the finite element model was verified. Then, the effects of structural parameters, such as the number of ribs, wall thickness, and inner tube diameter on the crashworthiness of the BST were investigated using the finite element method. Finally, to obtain the ideal configuration of structural parameters, the BST was optimized using the response surface method (RSM) with specific energy absorption (SEA) and crushing force efficiency (CFE) as the optimization objectives and peak crushing force (PCF) as the constraint condition. The results showed that the BST with six ribs exhibited the best crashworthiness under the same mass. The optimized BST-6 was found to have better energy absorption performance than the double circular tube (DCT) and the bionic-horsetail thin-walled tube (BHT). Compared with the DCT, the SEA and CFE increased by 35.15 % and 32.23 %, respectively.

A review on the risk, prevention and control of cooling water intake blockage in coastal nuclear power plants

Heshan Lin,Shuyi Zhang,Ranran Cao,Shihao Yu,Wei Bai,Rongyong Zhang,Jia Yang,Li Dai,Jianxin Chen,Yu Zhang,Hongni Xu,Kun Liu,Xinke Zhang Korean Nuclear Society 2024 Nuclear Engineering and Technology Vol.56 No.2

In recent decades, numerous instances of blockages have been reported in coastal nuclear power plants globally, leading to serious safety accidents such as power reduction, manual or automatic power loss, or shutdown of nuclear power units. Loss or shortage of cooling water may compromise the reliability of the cooling water system, thus threatening the operational safety of power plants and resulting in revenue reduction. This study provides a comprehensive review of the current state of cooling water system safety in coastal nuclear power plants worldwide and the common challenges they face, as well as the relevant research on cooling water system safety issues. The research overview and progress in investigation methods, outbreak mechanisms, prevention and control measures, and practical cases of blockages were summarized. Despite existing research, there are still many shortcomings regarding the pertinence, comprehensiveness and prospects of related research, and many problems urgently need to be solved. The most fundamental concern involves understanding the list of potential risks of blockages and their spatially distributed effects in surrounding waters. Furthermore, knowledge of the biological cycles and ecological habits of key organisms is essential for implementing risk prevention and control and for building a scientific and effective monitoring system.

Zirconium dioxide loaded montmorillonite composites as high-efficient adsorbents for the removal of Cr³⁺ ions from tanning wastewater

E, Tao,Ma, Dan,Yang, Shuyi,Sun, Yudong,Xu, Jiasheng,Kim, Eui Jung Academic Press 2019 Journal of solid state chemistry Vol.277 No.-

<P><B>Abstract</B></P> <P>Zirconium dioxide loaded montmorillonite (ZrO<SUB>2</SUB>-MMT) composites have been prepared using an ion-exchange process at room temperature followed by a thermal treatment. The as-prepared composites are used to adsorb Cr<SUP>3+</SUP> ions in the tanning wastewater with a lower initial Cr<SUP>3+</SUP> concentration, reducing residual Cr<SUP>3+</SUP> concentration to less than 1 mg L<SUP>−1</SUP>. XRD, TEM, SEM-EDS and XPS analyses are made to explore the structure and morphology of the composites. ZrO<SUB>2</SUB> is found to load on the interlayer and surface of MMT. The adsorption process is appropriately described by the pseudo-second-order kinetic equation and Langmuir equation. The ZrO<SUB>2</SUB>-MMT composites exhibit a better adsorption capacity than adsorption materials reported in the literature, and the maximum adsorption capacity for the initial Cr<SUP>3+</SUP> concentration of 10, 20, 30 mg L<SUP>−1</SUP> is as large as 142.86, 158.73 and 172.41 mg g<SUP>−1</SUP>, respectively. The removal efficiency of ZrO<SUB>2</SUB>-MMT for Cr<SUP>3+</SUP> remains above 92% after six cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> ZrO<SUB>2</SUB>-MMT composites were prepared by an ion-exchange process and thermal treatment. </LI> <LI> ZrO<SUB>2</SUB>-MMT exhibited a higher adsorption capacity for removal of lower Cr<SUP>3+</SUP> concentration. </LI> <LI> ZrO<SUB>2</SUB> particles can be loaded on the interlayer and surface of MMT. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>A schematic diagram of the prepared ZrO<SUB>2</SUB>-MMT composites: step 1 added Zr(SO<SUB>4</SUB>)<SUB>2</SUB> solution to MMT slurry and stirred; step 2 added the NaOH solution (5 mol L<SUP>−1</SUP>) to the mixture to achieve pH 7–8, stirred, centrifuged and dried at 50 °C; step 3 heat-treated for 4 h at 400 °C.</P> <P>[DISPLAY OMISSION]</P>