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In-process adaptive milling for large-scale assembly interfaces of a vertical tail driven by real-time vibration data

引用

Chinese Journal of Aeronautics 2022年第5期35卷 441-454页

作者： Xiong ZHAO Lianyu ZHENG Lu YU School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China C919 Division Shanghai Aircraft Manufacturing Co.LtdShanghai 201324China

assembly interfaces,the joint surfaces between the vertical tail and rear fuselage of a large aircraft,are thin-wall *** machining quality are seriously restricted by the machining *** address this problem,an in-process adaptive milling method is proposed for the large-scale assembly interface driven by real-time machining vibration *** this context,the milling operation is first divided into several process steps,and the machining vibration data in each process step is separated into some data ***,based on the real-time machining vibration data in each data segment,a finite-element-unit-force approach and an optimized space–time domain method are adopted to estimate the time-varying in-operation frequency response functions of the assembly *** FRFs are in turn employed to calculate stability lobe ***,the three-dimensional stability lobe diagram considering material removal is acquired via interpolation of all stability lobe ***,to restrain milling chatter and resonance,the cutting parameters for next process step,e.g.,spindle speed and axial cutting depth,are optimized by genetic ***,the proposed method is validated by a milling test of the assembly interface on a vertical tail,and the experimental results demonstrate that the proposed method can improve the machining quality and efficiency of the assembly interface,i.e.,the surface roughness reduced from 3.2μm to 1.6μm and the machining efficiency improved by 33%.

关键词： Adaptive milling assembly interfaces Data-driven Time-varying frequency response function Vertical tail

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Experimental investigation of junction growth of rough contacts using X-ray computed tomography

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Friction 2024年第11期12卷 2519-2531页

作者： Runliang WANG Jianhua LIU Bo LIU Duo JIA Xiaoyu DING School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China AECC Shenyang Engine Research Institution Shenyang 110000China

The real contact area(RCA)of randomly rough contacts has received a great deal of attention because it correlates strongly with friction,lubrication,sealing,and *** have revealed that the RCA associated with deterministic normal squeezing loads increases when tangential loads are also applied,in a phenomenon called junction ***,experimental investigations of the junction growth of randomly rough contacts are ***,we used X-ray computed tomography(CT)to measure junction growth when two aluminum alloy surfaces were in contact.A high-resolution experimental setup was used to apply loads and observe contact behaviors at a resolution of 4μ*** RCA and average contact gaps were computed using a three-dimensional(3D)geometric model constructed from gray CT images using the Otsu thresholding *** results showed that the RCA increased as the normal load *** RCA increased by 22.67%after a tangential load was applied(junction growth),and the average gap decreased by 14.01%after a tangential load was ***,X-ray CT accurately measured the junction growth as a novel quantitative method.

关键词： three-dimensional(3D)contact analyses real contact area(RCA),junction growth X-ray computed tomography(CT) assembly interfaces

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