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Analysis of spinal lumbar interbody fusion cage subsidence using Taguchi method, finite element analysis

Christopher John NASSAU, N. Scott LITOFSKY, Yuyi LIN

《机械工程前沿（英文）》 2012年第7卷第3期页码 247-255 doi: 10.1007/s11465-012-0335-2

摘要：

Subsidence, when implant penetration induces failure of the vertebral body, occurs commonly after spinal reconstruction. Anterior lumbar interbody fusion (ALIF) cages may subside into the vertebral body and lead to kyphotic deformity. No previous studies have utilized an artificial neural network (ANN) for the design of a spinal interbody fusion cage. In this study, the neural network was applied after initiation from a Taguchi L₁₈ orthogonal design array. Three-dimensional finite element analysis (FEA) was performed to address the resistance to subsidence based on the design changes of the material and cage contact region, including design of the ridges and size of the graft area. The calculated subsidence is derived from the ANN objective function which is defined as the resulting maximum von Mises stress (VMS) on the surface of a simulated bone body after axial compressive loading. The ANN was found to have minimized the bone surface VMS, thereby optimizing the ALIF cage given the design space. Therefore, the Taguchi-FEA-ANN approach can serve as an effective procedure for designing a spinal fusion cage and improving the biomechanical properties.

关键词： anterior lumbar interbody fusion (ALIF) artificial neural network (ANN) finite element interbody cage lumbar interbody fusion subsidence taguchi method

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Finite element analysis on the seismic behavior of side joint of Prefabricated Cage System in prefabricated

Yunlin LIU, Shitao ZHU

《结构与土木工程前沿（英文）》 2019年第13卷第5期页码 1095-1104 doi: 10.1007/s11709-019-0538-2

摘要： The Prefabricated Cage System (PCS) has the advantages of high bearing capacity and good ductility. Meanwhile, it is convenient for factory production and it is beneficial to the cost savings, construction period shortening. Side joint is the weak region of PCS concrete frame and has great influence on seismic behavior of the whole structure. Thus systematically study on the seismic behavior of PCS concrete side joint is necessary. This paper presents a finite element study on behavior of the side joint under seismic loading. In the finite element model, PCS concrete and the reinforced concrete (RC) is modeled by the solid element and fiber-beam element, respectively. The numerical results is compared with the experimental results and it is found that the results of model based on fiber-beam element is in better agreement with the experimental results than solid element model. In addition, the overall seismic behavior of the side joints in PCS concrete is better than that of the RC with the same strength.

关键词： PCS concrete side joint numerical simulation fiber-beam element joint model solid element joint model seismic behavior

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圆形重力式网箱流场效应的试验研究

刘超,关长涛,崔勇,赵侠,李梦杰,李真真,王腾腾

《中国工程科学》 2014年第16卷第9期页码 69-77

摘要：

为探索圆形重力式网箱在动态流场中的水动力学特性，同时获得网箱系统内部与周围流场分布及流速变化规律，设计了4 种不同网目形状和不同网目大小的网箱模型（C1、C2、C3、C4），选取4 种不同水流流速（0.068 m/s、0.105 m/s、0.143 m/s、0.182 m/s），分别采用声学多普勒流速仪（ADV）和粒子图像测速（PIV）技术对网箱系统内外的流速及流场变化进行测定。结果表明，ADV试验与PIV技术测量结果基本一致；来流速度不同时，单个网箱范围内的水流衰减程度差异不大；来流速度相同时，小网目网箱的减流效果优于大网目网箱；网目大小相同时，菱形网目网箱减流效果优于方形网目网箱；群组网箱减流效果明显，且随着水流通过网箱数目的增加，网箱内与网箱后的流速降低明显，其中第2 个网箱中心的流速衰减率已经达到了67.6 %，第4 个网箱中心的流速衰减率为88.2 %，网箱后的流速衰减率为72.1 %。研究结果可为养殖生产实践中网箱类型的选择提供理论参考。

关键词：网箱 ADV PIV 流速流场分布