Double-sided collaborative machining for propeller blade based on XYZ-3RPS hybrid kinematic machine

Xiangyu Guo,Rui Wang,Shi-Sheng Zhong 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.10

At present, propeller blades are machined single-sided with low efficiency. Thus, a propeller needs to be turned over after completion of the machining of the first side of the blade, which requires second clamping and causes a decline in accuracy. Therefore, a doublesided collaborative machining method for propeller blades is proposed herein. Two XYZ-3RPS hybrid kinematics machines were symmetrically distributed to machine both sides of a propeller blade simultaneously; therefore, the blade could be machined in clamping once, improving the machining efficiency and eliminating the accuracy decline caused by repetitive clamping. Moreover, a supporting device with rigid-flexible switching capability was developed to reduce the cantilever length of the blade, thereby eliminating the substantial deformation and vibration of the blade during the double-sided collaborative machining process to ensure machining accuracy. Additionally, the inverse kinematics formula for XYZ-3RPS hybrid kinematics machines was deduced and the elongation of each drive shaft through the cutter location point and cutter orientation was solved in this study. Thereafter, the decomposition method of the blade shift data was applied to obtain the deformation and vibration amplitude of the blade so that the performance of the double-sided cooperative machining could be quantitatively analyzed. Finally, experiments were conducted on the self-developed prototype, and the results verified the effectiveness of the double-sided collaborative machining method in reducing the deformation and vibration of a blade and improving machining efficiency.

Collision avoidance and orientation planning for ball-end cutter

Xiangyu Guo,Rui Wang,Shi-Sheng Zhong 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.8

Propeller blades have freeform surfaces, and the overlap among the blades limits the adjustment range of cutter orientation, making it extremely difficult to generate the required cutter orientation. Therefore, to assist in quickly designing a safe and reasonable machining scheme, a projection-offset method is designed to calculate the feasible region of a ballend cutter and an XYZ-3RPS hybrid kinematic mechanism. Based on this, a reasonable and smooth cutter orientation can be generated using path-planning and trajectory-optimization algorithms. To this end, a method for obtaining point clouds was first developed. By arranging the point clouds of a blank in the cutter path order, the changes to the blank during the machining process can be reflected through point-cloud deletion. A hierarchical bounding box is established for the moving platform of the cutter, spindle, and mechanism, which can realize the quick screening and classification of collision-point clouds. Second, the collision points are projected onto the same plane, an envelope boundary of the projected point cloud was constructed using an alpha-shapes algorithm, and its cross boundary trimmed using the auxiliary boundary method to obtain the feasible region at the cutter contact point. Moreover, to reduce the computational load, an interpolation method, which reduces the number of calculations, is used. The basic rules for cutter-orientation generation were established using a planning function. Then, the cutter-orientation path was smoothed using the trajectory-optimization algorithm to prevent the cutter from swinging violently. Finally, the effectiveness of this method was verified through propeller experiments.

Fabrication and Magnetic Properties of A New Fe-based Amorphous Compound Powder Cores

Xiangyue Wang,Deren Li,Caowei Lu,Feng Guo,Zhichao Lu,Shaoxiong Zhou 한국자기학회 2010 한국자기학회 학술연구발표회 논문개요집 Vol.2010 No.12

Fabrication and Magnetic Properties of A New Fe-based Amorphous Compound Powder Cores

Wang Xiangyue,Guo Feng,Lu Caowei,Lu Zhichao,Li Deren,Zhou Shaoxiong 한국자기학회 2011 Journal of Magnetics Vol.16 No.3

A new Fe-based amorphous compound powder was prepared from Fe-Si-B amorphous powder by crushing amorphous ribbons as the first magnetic component and Fe-Cr-Mo metallic glassy powder by water atomization as the second magnetic component. Subsequently by adding organic and inorganic binders to the compound powder and cold pressing, the new Fe-based amorphous compound powder cores were fabricated. This new Fe-based amorphous compound powder cores combine the superior DC-Bias properties and the excellent core loss. The core loss of 500 ㎾/㎥ at Bm = 0.1T and f = 100 ㎑ was obtained When the mass ratio of FeSiB/FeCrMo equals 3:2, and meanwhile the DC-bias properties of the new Fe-based amorphous compound powder cores just decreased by 10% compared with that of the FeSiB powder cores. In addition, with the increasing of the content of the FeCrMo metallic glassy powder, the core loss tends to decrease.

The Research of Multiple Regression Analysis in Rural-Urban Income Disparity

Jian Li,Xiangyu Guo 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.11

The multiple linear regression model contains more than one predictor variable and it shows the relationship among multiple variables. In the existing research field of rural-urban income disparity, the method of multiple regression analysis is mainly employed. But the linear relationship among variables is estimated mainly depending on principal component analysis. Principal component analysis is used to convert a set of observations of possibly correlated variables into a set of values of linearly uncorrelated variables called principal components. The principal component analysis is widely used for feature extraction to reveal the most main factors from the multiple aspects. A multiply linear regression model integrating principal components analysis is proposed to address on the income gap between the city and country. The influential factors are given and the analysis results are discussed in this paper. The experimental results on income data from 1990 to 2013 show that the proposed method is effective in predicting the income ratio and analyzing the influential factors.

Phenylboronic acid-functionalized gelatin–oleic acid nanoparticles for high loading and efficient transdermal delivery of Celastrol towards the treatment of psoriasis

Jiangtao Su,Na Lin,Xiangyu You,Heshuang Dai,Meng Rao,Lu Ye,Fan Ye,Le Cai,Yuxin Chen,Gao Zhou,Xiaoxia Guo 한국고분자학회 2023 Macromolecular Research Vol.31 No.11

Systemic toxicity, poor aqueous solubility, and poorly cell permeable ability hindered the clinical application of Celastrol. In this study, we aimed to design and synthesize an amphiphilic conjugate to encapsulate Celastrol into micelles to improve its water solubility, cellular membrane penetration, improving the clinic translation potential of Celastrol for the treatment of psoriasis. For this purpose, we first synthesized gelatin and oleic acid conjugate (GOC-1), and then covalently bonded 4-(3-boronophenylamino)-4-oxobutanoic acid (BPOA) with GOC-1 to form a stable GOC-2 conjugate which can self-assemble into micelles in aqueous solution. Celastrol (Cel) was physically encapsulated into the core of GOCs micelles. The dynamic stability, particle size, drug release, zeta potential, drug-loading efficiency, and surface morphology of Cel/loaded GOCs nano-micelles were determined. In addition, cell viability, cellular uptake of Cel/loaded GOC-2, and skin permeation and in vivo anti-psoriasis effect of Cel-loaded GOC-2 were investigated. Our results have shown that Cel/loaded GOC-1 and Cel/loaded GOC-2 have spherical shapes with diameters of around 200–300 nm. Compared to GOC-1, GOC-2 micelles showed higher drug-loading efficiency and excellent permeation ability in vitro. Moreover, Cel/GOC-2 micelles reduced erythema and white scales on the dorsal skin of psoriatic mice. In conclusion, BPOA attached GOC nanoparticles as a Celastrol carrier not only increase its water solubility but also improve drug-loading efficiency and cell permeation ability, exhibiting superior anti-psoriatic effect than the commercially available tacrolimus. Our work is expected to provide a facile approach to prepare nanocarrier for Celastrol to improve the clinic translation potential of Celastrol.

Enhanced Three-dimensional Surface Profile Measurement of Self-pierced Rivet by Feature-segmented Image Processing Method

J. Kim(김정섭),Xiangyu Guo,C. B. Lee(이차범) Korean Society for Precision Engineering 2022 한국정밀공학회 학술발표대회 논문집 Vol.2022 No.5

Non-destructive Inspection System for Self-piercing Riveting in CFRP-Metal Joining Product Using Stereoscopic Method with Robotic Manipulator

Hyunjae Lee,Jungsub Kim,Xiangyu Guo,ChaBum Lee 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.9

This paper presents a non-destructive inspection system for the self-piercing riveting (SPR) in carbon fiber reinforced plastic (CFRP)-metal joining products. The system employs a 6-degree of freedom robotic manipulator with a stereo vision system to measure the 3D depth and 2D surface profile of the joint using stereoscopic images. The proposed method applies a feature-selected segmentation algorithm and support vector machine to detect defects in the joints by comparing height differences between the target point profile and the target surroundings background profile. To verify the accuracy and performance of the proposed system, normal and abnormal cases were measured and classified using CFRP plate samples, and the method was then applied to the SPR joint in a CFRP b-pillar sample. The results demonstrate that the proposed system is reliable and accurate and has potential for real-world applications due to its high accuracy and reliability for quality control in SPR joint manufacturing.

Influence of processing parameters on warpage according to the Taguchi experiment

Guojian Zheng,Weiguo Dong,Qian Wang,Xiangyu Guo 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.10

An automotive triangle trim was chosen as a research model, and the influence of processing parameters was determined with the Taguchiexperimental method. An L27 (313) orthogonal array was constructed to investigate the significance of each factor (mold temperature,melt temperature, injection time, V/P switchover, packing pressure, and packing time). The computer-aided engineering softwareMoldflow was employed to determine the extent of warpage. The influence of processing parameters was analyzed by obtaining the signal-to-noise ratio and by conducting a range analysis. Furthermore, the processing parameters for minimizing warpage were optimized. Subsequently, the optimization packing condition for warpage minimization based on the filling conditions.

Fluorinated and Charged Non-woven Polypropylene Electret Fiber Membrane: A Novel Way in Transformer Oil Regeneration

Nianrong Zhou,Xiao He,Yuyang Yan,Xinliang Guo,Linshan Zhang,Yunhua He,Xiangyu Tan,Zhengyun Fang 한국전기전자재료학회 2022 Transactions on Electrical and Electronic Material Vol.23 No.2

The regeneration of transformer oil is a trending topic in the dielectric research field. However, the normal way of regeneration requires high cost and complicate process. In this paper, the non-woven polypropylene (PP) electret films were modifi ed by fluorination and corona method to achieve the regeneration function for transformer oil. The results show that the C-H bonds in polypropylene were replaced by C-F bonds during the fluorination process, resulting in the mean diameter of the fibers being decreased to a value of 1.7 μm. The increased roughness of the fi bers leads to super hydrophobicity. Further research revealed that the insulation properties of aging oil recovered after fi ltration by corona charged fl uorinated fi ber membranes. The result is especially signifi cant for breakdown voltage, the values of which reached half of the original insulating oil. In conclusion, the combination of fl uorinating and corona charging method on PP fi ber membrane shows great potential for insulation oil regeneration.