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Exploratory study of mechanical kinematic innovation design based on gene recombination operation
Yixiong Feng,Yicong Gao,Jianrong Tan,Ichiro Hagiwara 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.3
This paper analyzes the influencing factor of motion output of the inspired mechanism under the premise that the motion input is invariant. These factors are respectively expressed as kinematic pair chromosome number, kinematic pair feature gene and distance relationship vector gene by virtue of several concepts and principles in genetics, and then they are encoded. Mechanism chromosome model is established, which is constituted by mechanism chromosome relationship graph and mechanism chromosome matrix. Three kinematic pair chromosome gene recombination operations on mechanism chromosome model (dominance, translocation and metastasis), are proposed by using meiosis and chromosome variance in genetics for reference. Finally the paper takes shaper as the original mechanism and acquires its inspired mechanism, which proves the convenience and practicality of the methods.
Yang, Jianqing,Zhou, Jianrong,Zhang, Lianjun,Tan, Jinhao,Jiang, Xingfen,Zhou, Jianjin,Zhou, Xiaojuan,Hou, Linjun,Song, Yushou,Sun, XinLi,Zhang, Quanhu,Sun, Zhijia,Chen, Yuanbo Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.7
The <sup>n</sup>MCP (Neutron sensitive microchannel plate) combined with advanced readout electronics is widely used in energy selective neutron imaging because of its good spatial and timing resolution. Neutron detection efficiency is a crucial parameter for the <sup>n</sup>MCP. In this paper, a mathematical model based on the oblique cylindrical channel and elliptical pore was established to calculate the neutron absorption probability, the escape probability of charged particles and overall detection efficiency of <sup>n</sup>MCP and analyze the effects of neutron incident position, pore diameter, wall thickness and bias angle. It was shown that when the doping concentration of the <sup>n</sup>MCP was 10 mol%, the thickness of <sup>n</sup>MCP was 0.6 mm, the detection efficiency could reach maximum value, about 24% for thermal neutrons if the pore diameter was 6 ㎛, the wall thickness was 2 ㎛ and the bias angle was 3 or 6°. The calculated results are of great significance for evaluating the detection efficiency of the <sup>n</sup>MCP. In a subsequent companion paper, the mathematical model would be extended to the case of the spatial resolution and detection efficiency optimization of the coating <sup>n</sup>MCP.
Zhenyu Liu,Chuang Wang,Guifang Duan,Jianrong Tan 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.9
A simple and effective approach based on refined plate theory (RPT) is proposed to study the static and free vibration characteristics of functionally graded CNTreinforced composite (FG-CNTRC) plates. Compared to traditional higher order shear deformation theories (HSDTs), the proposed method shows more efficient for FG-CNTRC plates analysis. To solve the C1-continuity requirement of the RPT, we used isogeometric analysis (IGA) to approximate the displacement field, which shows more advantages than the FEA, since it can construct higher-order elements without additional variables. This is an advantage for plate structural analysis because more variables make the calculation cumbersome. Finally, four types of FG-CNTRC plates were investigated and the results show the accuracy and efficiency of the proposed method.
Jiang, Xingfen,Xiu, Qinglei,Zhou, Jianrong,Yang, Jianqing,Tan, Jinhao,Yang, Wenqin,Zhang, Lianjun,Xia, Yuanguang,Zhou, Xiaojuan,Zhou, Jianjin,Zhu, Lin,Teng, Haiyun,Yang, Gui-an,Song, Yushou,Sun, Zhiji Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.6
Gadolinium oxysulfide (GOS) is regarded as a novel scintillator for the realization of ultra-high spatial resolution in neutron imaging. Monte Carlo simulations of GOS scintillator show that the capability of its spatial resolution is towards the micron level. Through the time-of-flight method, the light output of a GOS scintillator was measured to be 217 photons per captured neutron, ~100 times lower than that of a ZnS/LiF:Ag scintillator. A detector prototype has been developed to evaluate the imaging solution with the GOS scintillator by neutron beam tests. The measured spatial resolution is ~36 ㎛ (28 line pairs/mm) at the modulation transfer function (MTF) of 10%, mainly limited by the low experimental collimation ratio of the beamline. The weak light output of the GOS scintillator requires an enormous increase in the neutron flux to reduce the exposure time for practical applications.
Zhu Jingtao,Liu Yang,Zhou Jianrong,Yang Zehua,Zhu Hangyu,Zhou Xiaojuan,Tan Jinhao,Cui Mingqi,Sun Zhijia 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.9
Neutron conversion detectors that use 10B-enriched boron carbide are feasible alternatives to 3 He-based detectors. We prepared boron carbide films at micron-scale thickness using direct-current magnetron sputtering. The structural characteristics of natural B4C films, including density, roughness, crystallization, and purity, were analyzed using grazing incidence X-ray reflectivity, X-ray diffraction, X-ray photoelectron spectroscopy, time-of-flight secondary ion mass spectrometry, and scanning electron microscopy. A beam profile test was conducted to verify the practicality of the 10B-enriched B4C neutron conversion layer. A clear profile indicated the high quality of the neutron conversion of the boron carbide layer.
A TEL decision method of process parameters for smart energy efficient manufacturing
Wei Zhe,Feng Yixiong,Hong Zhaoxi,Tan Jianrong 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.8
By constructing a Smart energy efficient manufacturing (SEEM) process grey model, craft parameter optimization is transformed into the process of multi-attribute decision making. Using fuzzy set theory to deal with uncertainty and inaccuracy fuzzy knowledge of SEEM assessment experts, a directly effect incidence matrix and a comprehensive effect matrix of SEEM process are put forward to be indexed by Trial and evaluation laboratory (TEL). The central degree and causal degree of each evaluation index are obtained, and then the relevance is analyzed between SEEM process evaluation indicators and weighted according to impact degrees. At the premise of maximizing of population benefits and minimizing of individual regret, the SEEM process parameters are determined by TEL-VIKOR theory. To obtain SEEM process parameters or compromise process parameters, a decision maker's subjective preference, and establishing control priorities of best SEEM process parameters are set. Finally, SEEM process parameters making decision example from discharge manufacturing process are applied to verify the proposed method.
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.
Xiaoxie Gao,Zhaoxi Hong,Yixiong Feng,Tianyue Wang,Ye Li,Jianrong Tan 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10
Reducing the disturbance of parameter fluctuations to the system is very important to the robustness of stamping product quality. In this paper, a 6-sigma robust optimization design method based on residual error and radial basis interpolation is proposed to weaken the negative influence of parameter fluctuations. Not only the key controllable parameters but also the key noise parameters are considered by grey relational analysis (GRA) to screen the parameters that have an important influence on the stamping quality. In order to reflect the relationship between key parameters and forming quality more precisely, the polynomial response surface model is improved based on residual error and radial basis function (RBF), and solved by the multi-population co-evolutionary immune algorithm (MPCEIA). Moreover, the solution of deterministic optimization is designed with 6-sigma robust optimization to improve the robustness of the system to the parameter fluctuations. Finally, the method is applied to the design of a complex automobile cover part, proving its effectiveness and reliability.
Complex CAD surface shape design using semantic features
Fengbei Cheng,Zhenyu Liu,Guifang Duan,Chan Qiu,Bing Yi,Jianrong Tan 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.7
To a large extent, the success of the product shape design depends on whether the geometric modeling systems can satisfy more andmore complicated design demands in the engineering field. This paper proposes a shape design method based on semantic features forcomplex CAD surface. By the proposed method, we can easily meet the complicated design requirements, since the semantic can effectivelyrepresent the design intent. We discussed three aspects in shape design using semantic features, which are semantic design demandsof the target surface, geometric constraints in accordance with semantic features, and surface shape deformation under the geometricconstraints, respectively. The basic semantic features of geometric models drive the deformation of the target surface shape bychanging the related constraint, and the desirable features are added to the CAD surface shape. The examples of the car shape design arepresented to verify the effectives of our method.
Enhanced Morris for the extraction of significant parameters in high-dimensional design optimization
Pei Yuan,Jin Cheng,Zhenyu Liu,Daxin Liu,Jianrong Tan 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.11
The traditional Morris method cannot ensure the consistent extraction of significant parameters because its random sampling strategy often leads to an improper coverage of the input space, especially when the number of sample points is small. To overcome the drawbacks, we developed an improved sampling strategy to enhance the performance of Morris method based on Latin hypercube sampling (LHS) with the idea of Central composite design (CCD) and a fluctuant step to generate a more uniform points set. A comparison on the results of a numerical example obtained by the enhanced Morris, the traditional methods and CCS-Morris demonstrated that the former had a much better performance. The application of the enhanced Morris method in the high-dimensional optimization of a compressor shell with 15 design parameters aimed at increasing its natural frequencies and keeping its mass relatively light demonstrates that the method is effective and applicable in engineering design.