Kinematic Chain Optimization Design Based on Deformation Sensitivity Analysis of a Five-Axis Machine Tool

Shuyou Zhang,Ci He,Xiaojian Liu,Jinghua Xu,Yanqiang Sun 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.12

This paper focuses on optimization of kinematic chain to reduce force-induced error in the scheme design phase of a fiveaxis machine tool. After conducting process planning on the machining target, local deformation of motion units in cutting positions is considered using a geometric way. A mathematical model is then established describing the influence of local deformation error on the general machining error through homogeneous transformation matrices. Conceptual model of the machine tool is constructed to obtain deformation distribution using static FEA. Error sensitivity coefficients are then calculated and compared among all alternative kinematic chains to select the optimized scheme. The proposed method is verified through a designing example of a fi ve-axis vertical machining center. The optimized kinematic chain could lower the magnitude of deformation sensitivities by 9.69% and increase error equalization variance by 71.25% compared to the conventional method.

STAGE-DISCHARGE CURVE AND ITS PREDICTION IN COMPOUND CHANNELS

CAO SHUYOU,YANG KEJUN,ZHANG ZHIXIANG,LIU XINGNIAN 한국수자원학회 2005 한국수자원학회 학술대회 Vol.2005 No.1

COMPONENT RESISTANCE PREDICTION IN COMPOUND CHANNELS

LIU XINGNIAN,ZHANG ZHIXIANG,YANG KEJUN,CAO SHUYOU 한국수자원학회 2005 한국수자원학회 학술대회 Vol.2005 No.1

Innovative Surface Merging Method for Generating Point-Based Skin Model Shapes Considering Processing Features

Ci He,Shuyou Zhang,Lemiao Qiu,Zili Wang,Xiaojian Liu 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.11

Virtual prototypes have been appealing in the early design stage of computer aided tolerancing, because it is less expensive to evaluate and modify tolerances numerically. Derived from the machining processes, form uncertainties are simulated, controlled and analyzed in virtual prototypes using parametric and intuitive surface patches. The generation of a complete virtual prototype often involves combining surface patches with different patterns to one complete model. To overcome possible geometric defects in this process, a surface merging method is proposed in this paper. Skin Model Shapes is first introduced as the geometric foundation. The whole part surface is segmented based on the geometric shape and machining type. Then point-based patches are generated accordingly. Interpolation implicit surfaces based on radial basis function networks are constructed in patch boundaries based on spatial-constrained homogeneous transformation matrices. A feature augmentation process is then introduced to preserve processing features after resampling the blend patch. The proposed method is proved to be efficient in feature retaining as well as surface smoothing, through numerical experiments and analysis on an example mechanical part. The results show that the generated virtual prototype would become 62.5% more smooth while retaining a 91.6% feature similarity after using the proposed method. Moreover, the proposed method could preserve 174% more features at a cost of 9.0% smoothness than using a conventional modified trimmed filtering method.

Learning-based Predictive Control for Vehicle Following Problems

Ziliang Wang,Shuyou Yu,Yajing Zhang,Xiaohui Yu,Hong Chen 제어로봇시스템학회 2023 제어로봇시스템학회 국제학술대회 논문집 Vol.2023 No.10

Reinforced quantum-behaved particle swarm-optimized neural network for cross-sectional distortion prediction of novel variable-diameter-die-formed metal bent tubes

Wang Caicheng,Wang Zili,Zhang Shuyou,Liu Xiaojian,Tan Jianrong 한국CDE학회 2023 Journal of computational design and engineering Vol.10 No.3

With light weight, high strength, and high performance, metal bent tubes have attracted increasing applications in aeronautics. However, the growing demand for customized tubular parts has led to a significant increase in the cost of conventional tube-bending processes, as they can only process tubes of a specific diameter. To this end, this paper proposes a variable diameter die (VDD) scheme which can bend tubes with a specific range of diameters. To investigate the formability of VDD-processed tubes for practical VDD applications, an accurate and reliable prediction method of cross-sectional distortion is imperative. Hence, we pioneer a novel intelligent model based on quantum-behaved particle swarm optimization (QPSO)-optimized back-propagation neural network (BPNN) to predict a rational cross-sectional distortion characterization index: average distortion rate. The adaptive adjustment of coefficients and the Gaussian distributed random vector are introduced to QPSO, which balance the search and enhance the diversity of the population, respectively. For further improvement in optimization performance, the informed initialization strategy is applied to QPSO. The efficiency of the proposed reinforced QPSO (RQPSO)-optimized BPNN model is evaluated by comparing the results with those of the BPNN, BPNN with Xavier initialization, several different particle swarm optimization variants-optimized BPNN models, and variants of popular machine learning models. The results indicated the superiority of RQPSO over other methods in terms of the coefficient of determination (${R}^2$), variance account for, root mean square error (MSE), mean absolute error, and standard deviation of MSE. Thus, the proposed novel algorithm could be employed as a reliable and accurate technique to predict the cross-sectional distortion of VDD-processed tubes.

Multi-orientation optimization of complex parts based on model segmentation in additive manufacturing

Hongshuai Guo,Jinghua Xu,Shuyou Zhang,Yiming Zhang,Jianrong Tan 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.1

Build orientation has a significant impact on the surface quality, support structure, and final cost of the fabricated model. In this study, we focus our attention on the surface quality and printing cost of complex parts when fabricated under multiple build orientations. A novel method using model segmentation is proposed to search for an optimal build orientation for each sub-model decomposed by Reeb graph. The sub-model is divided into separate regions that are treated differently based on modified curvature shift strategy. Every flat facet of the regions is given a different weight factor to build the volume error function. The optimal build orientation for each sub-model is the one leading to the minimal error of the volume error function. The case study demonstrates that the proposed method obtains a smaller error without any support structure. The model surface in higher weighted regions obtains a higher surface quality and is more cost saving when printed, especially for complex models.

Customized product design information feedback technology based on tentative design chain reconstruction

Lemiao Qiu,Huifang Zhou,Zili Wang,Yiming Zhang,Shuyou Zhang,Longwu Pan 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.12

The design process of customized products involves dynamic feedback on customer requirements, design alterations, design knowledge, and other information. Current technologies for designing customized products focus on implementing product functions, but are short of effective support for design information feedback. The paper introduces a feedback technology of customized product design information based on tentative design chain reconstruction, whereby a tentative design chain and a corresponding design assignment matrix (DAM) are built in accordance with the logical relationship between the design assignments of the customized product. The tentative design chain is reconstructed through matrix decomposition to optimize the implementation path of the design assignments. Based on the reciprocal relationship between information transfer and feedback path for the design of a customized product, the feedback path of the customized product design information is extracted. The implementation method for feedback are put forward so that the design strategy of the customized product can be adjusted promptly with the feedback information between assignments. The feedback technology of the customized product design information based on the tentative design chain reconstruction is verified by application in the design of the elevator traction sheave. The results show that it helps to reduce the degree of the cross correlation between design assignments, and simplifies the design process of the elevator traction wheel.

Application of Biophysical Properties of Meridians in the Visualization of Pericardium Meridian

Xiong Feng,Xu Ruimin,Li Tongju,Wang Jinyu,Hu Qingchuan,Song Xiaojing,Wang Guangjun,Su Huanhuan,Jia Shuyong,Wang Shuyou,Zhu Zongxiang,Zhang Weibo 사단법인약침학회 2023 Journal of Acupuncture & Meridian Studies Vol.16 No.3

Background: The biophysical properties of the meridian system, an important concept of traditional Chinese medicine, include low impedance, resounding voice, and high acoustic conductance, all of which are helpful for elucidating the essence of meridians. Objectives: To visualize the human pericardium meridian (PC) based on the resounding voice property of meridians. Methods: Visualization of the PC was performed by injection of fluorescein sodium at the PC6 acupoint (Neiguan) on the PC. Before injection, percussion active points (PAPs) were identified by the virtue of their resounding voice properties. After injection, the trajectories of fluorescein migration throughout the body surface were recorded and analyzed. The distribution of fluorescein in the tissue was further studied using cross-sections of hind limbs of mini-pigs, in which fluorescein was injected into low impedance points. Results: The identified PAP lines were colocalized with PC. Following intradermal fluorescein injection, 1-3 fluorescent lines, which were unrelated to the arm veins, were observed in 7 of 10 participants; 85.4% of fluorescent signals were coincident with PAPs and their intensity had a negative correlation with the body mass index (r = –0.56, p = 0.045). Cross-sections showed a Y-shaped fluorescence pattern where the two migration lines on the surface were the two vertices of the “Y.” Conclusion: The trajectories of fluorescein in the body are suggestive of the anatomical structure of meridians. The PC is related to the deep horizontal interstitial channels that connect to the body surface through vertical interstitial spaces. These biophysical properties and techniques for meridian visualization are valuable for revealing the anatomical structure of meridians.