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FDM 3D打印成型缺陷机器视觉检测方法
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作者 孙晓辉 朱洪雷 聂小春 《机电工程技术》 2026年第1期78-83,共6页
针对FDM 3D打印成型的外观缺陷机器视觉检测的需求,研究了基于邻域增强处理和频域增强处理,以及纹理统计分析的3种缺陷检测方法。邻域和频域增强检测方法是假设在规则的打印条纹中间出现的不规则形态即为打印缺陷,通过两种不同的处理途... 针对FDM 3D打印成型的外观缺陷机器视觉检测的需求,研究了基于邻域增强处理和频域增强处理,以及纹理统计分析的3种缺陷检测方法。邻域和频域增强检测方法是假设在规则的打印条纹中间出现的不规则形态即为打印缺陷,通过两种不同的处理途径滤除或削弱图像中的规则条纹以增强目标缺陷,最后分割缺陷并做颗粒分析来完成检测。纹理分析检测方法是基于窗口的灰度空间相关性与参考纹理分类识别的一种方法,该方法通过一类向量机分类器将无法归类的窗口识别为缺陷。基于NI Vision视觉库和LabVIEW开发平台,设计了3种缺陷检测方法程序。3D打印样品缺陷检测实验研究发现,当图像中的缺陷位于检测目标外侧时,邻域和频域增强检测法均无法检出,而纹理分析检测法的检出率达到100%,通用性更好;在检出相同显著缺陷的条件下,纹理分析检测法检测用时约990 ms,而邻域和频域法检测用时分别约为前者的10%和40%,具有更好的在线应用前景;在检测精度方面,频域增强检测法可达像素级精度,而邻域增强检测法和纹理分析检测法却受形态学处理单元和检测窗口的影响而精度较低。 展开更多
关键词 fdm 3D打印成型 机器视觉 缺陷检测 LABVIEW
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一种FDM型3D打印机震动喷头设计
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作者 韩玉娟 邢洁林 《科技创新与应用》 2026年第3期110-113,共4页
设计一种FDM型3D打印机震动喷头,该震动喷头采用分体式结构,喷头下端为常用六边形喷嘴,上端集成加热块、4片压电陶瓷片和4个柔性铰链机构。此设计不改变传统FDM型打印喷头的结构,是在一体化小型喷头的基础上进行拆分设计,将振动部分拓... 设计一种FDM型3D打印机震动喷头,该震动喷头采用分体式结构,喷头下端为常用六边形喷嘴,上端集成加热块、4片压电陶瓷片和4个柔性铰链机构。此设计不改变传统FDM型打印喷头的结构,是在一体化小型喷头的基础上进行拆分设计,将振动部分拓展到喷头整个加热端,压电陶瓷部分裸露在外,可以自由接线并连接到外部电路。相比封闭的压紧式超声振动喷头,贴片式结构整体更为简单,方便电路元件的安装。 展开更多
关键词 3D打印机 震动喷头 分体式结构 fdm 贴片式结构
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以FDM技术为核心的“增材制造技术”教学改革实践
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作者 王叶松 张礼华 方喜峰 《网印工业》 2026年第2期118-120,共3页
针对“增材制造技术”教学中理论与实践脱节、实验项目单一、评价片面等问题,提出了“项目式教学+翻转课堂+双导师制”教学方法,建立了“过程+成果+反馈”三维评价体系,设计了“基础—综合—创新”实验教学方法。以2021级和2022级教学... 针对“增材制造技术”教学中理论与实践脱节、实验项目单一、评价片面等问题,提出了“项目式教学+翻转课堂+双导师制”教学方法,建立了“过程+成果+反馈”三维评价体系,设计了“基础—综合—创新”实验教学方法。以2021级和2022级教学班级为例,对比改革前后学生成绩、实践能力及企业反馈,结果表明,改革后学生课程考试平均分提升12.7%,实验操作考核平均分提升21.5%,学科竞赛获奖率提升187.5%,学生对教学方法及满意度提升45%,验证了改革的有效性。 展开更多
关键词 增材制造 fdm 教学改革 评价体系 实验教学方法
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基于FDM技术的机械夹具轻量化结构设计与3D打印成型精度优化
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作者 石川 《机械管理开发》 2026年第2期243-245,共3页
针对传统机械夹具材料利用率低、制造周期长及FDM 3D打印成型精度不足的问题,提出基于FDM技术的机械夹具轻量化结构设计与成型精度优化方案。通过拓扑优化与参数化建模结合的方法实现夹具轻量化设计,以某型车床夹具为研究对象,建立以刚... 针对传统机械夹具材料利用率低、制造周期长及FDM 3D打印成型精度不足的问题,提出基于FDM技术的机械夹具轻量化结构设计与成型精度优化方案。通过拓扑优化与参数化建模结合的方法实现夹具轻量化设计,以某型车床夹具为研究对象,建立以刚度约束、重量最小为目标的拓扑优化模型,得到轻量化结构方案;基于田口方法设计正交实验,分析层高、打印速度、喷嘴温度对成型精度的影响,构建精度优化回归模型。实验结果表明:轻量化夹具质量减轻32.6%,刚度满足使用要求;优化后尺寸误差从±0.35 mm降至±0.12 mm,表面粗糙度R_(a)从8.5μm降至3.2μm。研究为FDM技术在机械夹具制造中的工程应用提供了理论支撑与实践参考。 展开更多
关键词 fdm技术 机械夹具 轻量化设计 拓扑优化 成型精度
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基于FDM技术的PLA 4D打印构件热致变形规律及工艺结构调控研究
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作者 陈舒旸 陈楚洋 《制造技术与机床》 北大核心 2026年第4期64-75,共12页
4D打印技术通过使用智能响应材料,使打印结构在外部刺激下产生形状、性能与功能的动态演化。目前的研究多依赖打印后外加应力编程,流程复杂且稳定性不足。针对这一问题,选用聚乳酸(polylactic acid,PLA)材料与商用熔融沉积成型(fused de... 4D打印技术通过使用智能响应材料,使打印结构在外部刺激下产生形状、性能与功能的动态演化。目前的研究多依赖打印后外加应力编程,流程复杂且稳定性不足。针对这一问题,选用聚乳酸(polylactic acid,PLA)材料与商用熔融沉积成型(fused deposition modeling, FDM)打印机,采用内置力编程策略实现形状记忆效应。将打印工艺参数与模型结构参数相结合,通过局部控制打印路径方向调节收缩量和方向实现4D打印效应并分析影响机理。实验结果表明,参数的改变可有效调控残余应力分布,实现可预测的形变响应。基于实验规律,进一步进行了复杂4D打印结构的设计,并通过热致响应实验对设计方案进行了验证。 展开更多
关键词 4D打印 熔融沉积成型法 PLA 变形性能 残余应力
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A Cost-Effective Approach to Precisely Estimate Singlet-Triplet Energy Gaps in MR-TADF Molecules:Combining Delta Self-Consistent Field and Time-Dependent Density Functional Theory Methods
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作者 Qian Jina Dong Wang 《Chinese Journal of Chemical Physics》 2026年第1期41-50,I0021-I0032,I0042,共23页
As a novel class of purely organic fluores-cent materials,multiple resonance thermal-ly activated delayed fluorescence(MR-TADF)compounds hold significant promise for next-generation display technologies.The efficiency... As a novel class of purely organic fluores-cent materials,multiple resonance thermal-ly activated delayed fluorescence(MR-TADF)compounds hold significant promise for next-generation display technologies.The efficiency of exciton utilization and the overall performance of organic light-emit-ting devices are closely linked to the singlet-triplet energy gap(ΔE_(ST))of MR-TADF emitters.Identifying an economic and accu-rate theoretical approach to predictΔE_(ST)would be beneficial for high-throughput screening and facilitate the inverse design of MR-TADF molecules.In this study,we evaluated the S_(1)state energy(E(S_(1))),T_(1)state ener-gy(E(T_(1))),andΔE_(ST)using three different physical interpretations:adiabatic excitation ener-gy,vertical absorption energy,and vertical emission energy.We employed the time-depen-dent density functional theory(TDDFT)and delta self-consistent field(ΔSCF)methods to calculate E(S_(1)),E(T_(1)),andΔE_(ST)for 20 MR-TADF molecules reported in the literature.We compared these calculated values with experimental data obtained from fluorescence spec-troscopy at room-temperature(or 77 K)and phosphorescence spectroscopy conducted at 77 K.Our findings indicate that the vertical absorption energy at the S0 state minimum,deter-mined by theΔSCF method,accurately predicts the S_(1)state energy.Similarly,the vertical absorption energy at the S0 state minimum,calculated using the TDDFT method,effectively predicts the T_(1)state energy.TheΔE_(ST)derived from the difference between these two excita-tion energies exhibited the smallest mean absolute error of only 0.039 eV compared to the ex-perimental values.This combination represents the most accurate and cost-effective method reported to date for predicting theΔE_(ST)of MR-TADF molecules,and can be integrated into AI-driven inverse design workflows for new emitters. 展开更多
关键词 Organic light-emitting diode Multiple resonance thermally activated delayed fluorescence emitter Single-triplet energy gap Delta self-consistent field method Time-de-pendent density functional theory method
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Healthcare professionals’perspectives on disclosure of diagnosis and related issues in childhood cancer:A mixed methods systematic review
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作者 Run Xie Xiaoyan Huang +4 位作者 Yiran Du Ying Gu Qiongfang Kang Hongsheng Wang Daqian Zhu 《International Journal of Nursing Sciences》 2026年第1期96-104,I0006,共10页
Objectives This review aimed to systematically synthesize the available research on the disclosure of diagnosis and related issues in childhood cancer from the perspectives of healthcare professionals,with the goal of... Objectives This review aimed to systematically synthesize the available research on the disclosure of diagnosis and related issues in childhood cancer from the perspectives of healthcare professionals,with the goal of informing the optimization of disclosure processes and meeting the communication needs of affected families.Methods In accordance with the Joanna Briggs Institute(JBI)methodology for mixed methods systematic reviews,the convergent segregated approach was used in this review.Articles were retrieved from 11 databases,including PubMed,Web of Science,CINAHL,CENTRAL,Embase,Ovid/Medline,PsycINFO,PsycArticles,Scopus,ERIC,and China National Knowledge Infrastructure(CNKI).The quality of the selected articles was assessed using the Mixed Method Appraisal Tool(MMAT).The review protocol was registered on PROSPERO(CRD42024542746).Results A total of 21 studies from 10 countries were included.Their methodological quality was generally medium to high,with MMAT scores ranging from 60%to 100%.The synthesis yielded three core themes:1)the spectrum of professional and societal attitudes toward disclosure;2)the dynamic practices of navigating disclosure amid uncertainty,including timing and environment,stakeholders,and content of disclosure;and 3)factors influencing disclosure,including children’s,parental,healthcare professionals’,and socio-cultural factors.Conclusions This review synthesized the perspectives and experiences of healthcare professionals regarding disclosure in childhood cancer,highlighting the complexity and multidimensional nature of this process in clinical practice.Future research should further investigate the experiences and needs of children and their parents,explore cultural variations in disclosure practices,develop context-appropriate assessment tools,and construct multidimensional intervention strategies to enhance the humanistic care and professional effectiveness of the disclosure process. 展开更多
关键词 Communication CANCER DISCLOSURE Healthcare professionals Mixed methods PEDIATRIC Systematic review
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Subtitle Translation Methods of The Good Wife From Functional Equivalence Perspective
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作者 WANG Ya-kun BAO De-wang 《Journal of Literature and Art Studies》 2026年第1期26-30,共5页
The Good Wife is an American TV series that focuses on women’s independence,politics,and law.The drama has been remade in China,Japan,and South Korea.This research aims to use Nida’s Functional Equivalence Theory to... The Good Wife is an American TV series that focuses on women’s independence,politics,and law.The drama has been remade in China,Japan,and South Korea.This research aims to use Nida’s Functional Equivalence Theory to analyze the methods of its English-to-Chinese subtitle translation by considering social,cultural,and historic backgrounds between China and America.After data collection and case analysis,the study found that:(1)Five major translation methods are adopted in the subtitle translation of The Good Wife.They are free translation,variation,literal translation,addition,and omission.Among them,free translation is the most frequently used,while omission is used least.(2)The subtitle translation of films and TV series is limited by time and space restrictions,social-cultural differences,and other factors.When translating,translators should try to use humorous words,euphemism,intonation,and other ways,and combine different methods such as literal translation,free translation,variation,addition,omission,and other methods to seek equivalence both in the meaning and function of subtitles under the guidance of Functional Equivalence Theory. 展开更多
关键词 subtitle translation Functional Equivalence Theory The Good Wife translation methods
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Fourth Order Compact Finite Volume Methods for 1D Elliptic and Parabolic Equations on Non-uniform Meshes
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作者 ZHOU Lei WANG Feng WANG Tongke 《应用数学》 北大核心 2026年第2期342-359,共18页
This paper studies high order compact finite volume methods on non-uniform meshes for one-dimensional elliptic and parabolic differential equations with the Robin boundary conditions.An explicit scheme and an implicit... This paper studies high order compact finite volume methods on non-uniform meshes for one-dimensional elliptic and parabolic differential equations with the Robin boundary conditions.An explicit scheme and an implicit scheme are obtained by discretizing the equivalent integral form of the equation.For the explicit scheme with nodal values,the algebraic system can be solved by the Thomas method.For the implicit scheme with both nodal values and their derivatives,the system can be implemented by a prediction-correction procedure,where in the correction stage,an implicit formula for recovering the nodal derivatives is introduced.Taking two point boundary value problem as an example,we prove that both the explicit and implicit schemes are convergent with fourth order accuracy with respect to some standard discrete norms using the energy method.Two numerical examples demonstrate the correctness and effectiveness of the schemes,as well as the indispensability of using non-uniform meshes. 展开更多
关键词 Two point boundary value problem Parabolic equation Robin boundary condition Non-uniform mesh Fourth order compact finite volume scheme Predictioncorrection method Error estimate
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Analysis of the Effectiveness and Teaching Satisfaction of Diversified Teaching Methods in Clinical Instruction for Operating Room Nursing Interns
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作者 Jie Gao Yuanrong Luo 《Journal of Clinical and Nursing Research》 2026年第2期40-46,共7页
Objective: To analyze the advantages of diversified teaching methods in the clinical instruction of operating room nursing interns. Methods: Twenty-one nursing interns who underwent internships in the operating room f... Objective: To analyze the advantages of diversified teaching methods in the clinical instruction of operating room nursing interns. Methods: Twenty-one nursing interns who underwent internships in the operating room from March 2023 to March 2024 were selected as the control group and received conventional teaching methods. Another twenty-one nursing interns who underwent internships in the operating room from April 2024 to April 2025 were selected as the experimental group and received diversified teaching methods. The teaching effects of the two groups were compared. Results: The experimental group scored higher than the control group in assessments, teaching satisfaction, and teaching quality evaluations, as well as in post-instruction professional identity scores (p < 0.05). Conclusion: Diversified teaching methods can enhance the professional competence of operating room nursing interns, cultivate their professional identity, and yield high teaching satisfaction, thereby improving teaching quality. 展开更多
关键词 Diversified teaching methods Operating room nursing interns Clinical instruction Teaching satisfaction
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Four Major Diseases Affecting Pear Trees and Their Prevention and Control Methods
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作者 Longfei LI Jintao XU +5 位作者 Minghui JI Huan LIU Lijuan GAO Yue YAO Gang NIU Baofeng HAO 《Plant Diseases and Pests》 2026年第1期1-3,13,共4页
This paper presents an overview of the pathogens, symptoms of damage, patterns of occurrence, and chemical control methods associated with four major pear tree diseases: pear scab, pear ring rot, pear anthracnose, and... This paper presents an overview of the pathogens, symptoms of damage, patterns of occurrence, and chemical control methods associated with four major pear tree diseases: pear scab, pear ring rot, pear anthracnose, and pear speckle. The objective is to provide valuable references for the scientific and precise prevention and management of diseases in pear orchards, thereby contributing to the production of high-quality and high-yield pear fruits. 展开更多
关键词 PEAR Disease PATHOGEN Symptoms of damage Patterns of occurrence Prevention and control methods
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不同轴重作用下有砟道床-路基动力响应DEM-FDM三维仿真分析 被引量:1
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作者 徐鹏 钟熠 +2 位作者 孟宇涵 杨广庆 李婷 《振动工程学报》 北大核心 2026年第1期260-267,共8页
有限元法(FEM)与有限差分法(FDM)无法准确模拟离散道砟颗粒,离散元法(DEM)虽然可以模拟道砟的离散特性,但是因为计算效率等问题,常将实际有砟道床-路基三维结构简化为二维平面模型。为此,采用DEM-FDM数值方法建立了轨枕-有砟道床-路基... 有限元法(FEM)与有限差分法(FDM)无法准确模拟离散道砟颗粒,离散元法(DEM)虽然可以模拟道砟的离散特性,但是因为计算效率等问题,常将实际有砟道床-路基三维结构简化为二维平面模型。为此,采用DEM-FDM数值方法建立了轨枕-有砟道床-路基三维耦合模型,通过与二维耦合模型结果、理论解析值以及既有实测值的对比,验证了三维模型的准确性。通过开展不同轴重下的有砟道床-路基动力响应三维仿真分析发现:与横向位移相比,不同轴重作用下枕下道砟均以竖向位移为主;随着轴重的增加,砟肩处道砟横向位移愈加明显并且扩散角逐渐由35°增大到55°;不同轴重作用下动应力、加速度的影响范围基本不变,但随着轴重的增加,基床表面动应力、加速度沿横断面方向W形分布的趋势越明显;基床表面竖向位移与轴重呈正相关关系,且随着轴重的增加其分布形状逐渐由W形变为U形。 展开更多
关键词 有砟道床 动力响应 轴重 离散元法 有限差分法
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Tunnel ahead prospecting methods and intelligent interpretation of adverse geology:A review
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作者 Shucai Li Bin Liu +4 位作者 Lei Chen Huaifeng Sun Lichao Nie Zhengyu Liu Yuxiao Ren 《Journal of Rock Mechanics and Geotechnical Engineering》 2026年第1期1-19,共19页
Geological prospecting and the identification of adverse geological features are essential in tunnel construction,providing critical information to ensure safety and guide engineering decisions.As tunnel projects exte... Geological prospecting and the identification of adverse geological features are essential in tunnel construction,providing critical information to ensure safety and guide engineering decisions.As tunnel projects extend into deeper and more mountainous terrains,engineers face increasingly complex geological conditions,including high water pressure,intense geo-stress,elevated geothermal gradients,and active fault zones.These conditions pose substantial risks such as high-pressure water inrush,largescale collapses,and tunnel boring machine(TBM)blockages.Addressing these challenges requires advanced detection technologies capable of long-distance,high-precision,and intelligent assessments of adverse geology.This paper presents a comprehensive review of recent advancements in tunnel geological ahead prospecting methods.It summarizes the fundamental principles,technical maturity,key challenges,development trends,and real-world applications of various detection techniques.Airborne and semi-airborne geophysical methods enable large-scale reconnaissance for initial surveys in complex terrain.Tunnel-and borehole-based approaches offer high-resolution detection during excavation,including seismic ahead prospecting(SAP),TBM rock-breaking source seismic methods,fulltime-domain tunnel induced polarization(TIP),borehole electrical resistivity,and ground penetrating radar(GPR).To address scenarios involving multiple,coexisting adverse geologies,intelligent inversion and geological identification methods have been developed based on multi-source data fusion and artificial intelligence(AI)techniques.Overall,these advances significantly improve detection range,resolution,and geological characterization capabilities.The methods demonstrate strong adaptability to complex environments and provide reliable subsurface information,supporting safer and more efficient tunnel construction. 展开更多
关键词 Tunnel geological ahead prospecting Complex geological and environmental conditions Airborne geophysical methods Tunnel geophysical detection Borehole geophysical prospecting Intelligent geological interpretation
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FDM成型PLA件有限元模拟及成型工艺分析 被引量:1
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作者 郭玉波 崔琦 《塑料》 北大核心 2025年第5期146-152,158,共8页
以熔融沉积成型(FDM)聚乳酸(PLA)制件为研究对象,建立PLA制件有限元模型,并结合“生死单元技术”进行温度场模拟,采用正交试验研究打印工艺参数对FDM成型制件成型质量的影响,确定了最优的打印工艺参数。研究结果表明,采用ANSYS有限元模... 以熔融沉积成型(FDM)聚乳酸(PLA)制件为研究对象,建立PLA制件有限元模型,并结合“生死单元技术”进行温度场模拟,采用正交试验研究打印工艺参数对FDM成型制件成型质量的影响,确定了最优的打印工艺参数。研究结果表明,采用ANSYS有限元模拟得到了PLA件在FDM成型过程中的温度场分布特征,为正交试验的研究提供分析依据;按照4水平4要素(L16)正交试验,研究了分层厚度、打印速度、喷嘴温度、热床温度对制件成型质量的影响。采用综合平衡法得到了最优工艺参数为分层厚度为0.25 mm、打印速度为45 mm/s、喷嘴温度为190℃、热床温度为70℃。最后,通过误差分析证明了实验结果的合理性。 展开更多
关键词 fdm成型 ANSYS有限元模拟 正交试验 聚乳酸(PLA) 工艺参数
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FDM型3D打印技术参数优化研究 被引量:1
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作者 王继群 《科技视界》 2025年第7期14-17,共4页
3D打印技术被广泛应用于各个领域,3D打印各种参数的设置会对产品的质量产生较大的影响,本文对熔融沉积成型(FDM)技术的3D打印技术参数进行了分析研究,采用迭代调整的算法对打印技术参数进行优化,给出了参数优化的步骤,经过实际试验测试... 3D打印技术被广泛应用于各个领域,3D打印各种参数的设置会对产品的质量产生较大的影响,本文对熔融沉积成型(FDM)技术的3D打印技术参数进行了分析研究,采用迭代调整的算法对打印技术参数进行优化,给出了参数优化的步骤,经过实际试验测试,最终获得了优化后的3D打印参数,提高了打印效果。 展开更多
关键词 3D打印技术 熔融沉积成型(fdm) 参数优化
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FDM型3D打印产品强度提高分析研究
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作者 王继群 《北京工业职业技术学院学报》 2025年第4期1-4,共4页
FDM型3D打印技术广泛应用于多个生产领域,但其打印制造的产品强度,与传统的机加工产品相比,仍然有一定的差距。为了提高FDM型3D打印产品的强度,通过介绍打印的技术原理,分析影响打印产品强度的各种因素,探讨了提高打印产品强度的具体优... FDM型3D打印技术广泛应用于多个生产领域,但其打印制造的产品强度,与传统的机加工产品相比,仍然有一定的差距。为了提高FDM型3D打印产品的强度,通过介绍打印的技术原理,分析影响打印产品强度的各种因素,探讨了提高打印产品强度的具体优化措施。样件的强度测试结果证明,采用打印参数优化与材料结构优化相结合、改进打印方向的方式,强度提升效果最好。 展开更多
关键词 fdm型3D打印 产品强度 打印参数 结构优化
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基于FDM技术的蕾丝3D打印面料开发 被引量:4
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作者 程燕婷 孟家光 +1 位作者 薛涛 刘晓巧 《针织工业》 北大核心 2025年第2期1-4,共4页
为了丰富3D打印面料的花型,增加目前市面上蕾丝面料的外观、风格及品种,通过正交试验分析,得到蕾丝3D打印面料的最佳打印参数为:分层厚度0.20 mm,打印速度90 mm/s,打印温度220℃。以柔性PLA为材料,采用FDM技术,在最佳打印参数下,对3ds ... 为了丰富3D打印面料的花型,增加目前市面上蕾丝面料的外观、风格及品种,通过正交试验分析,得到蕾丝3D打印面料的最佳打印参数为:分层厚度0.20 mm,打印速度90 mm/s,打印温度220℃。以柔性PLA为材料,采用FDM技术,在最佳打印参数下,对3ds Max软件中模拟的模型进行打印,开发出一款具有科技感和时尚感的蕾丝3D打印面料。对蕾丝3D打印面料的性能进行测试,得到蕾丝3D打印面料的横向拉伸强力为74 N,纵向拉伸强力为158 N;顶破强力为204 N;横向抗弯长度为30 mm,纵向抗弯长度为32 mm;透气率为3143 L/(m^(2)·s);透湿量为8251 g/[m^(2)·(24 h)]。该研究为3D打印面料的成形精度提升及蕾丝面料的花型开发提供了参考。 展开更多
关键词 蕾丝 3D打印 fdm技术 面料开发
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Delta结构FDM 3D打印机成型精度控制方法 被引量:2
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作者 黄振兴 剡昌锋 +1 位作者 杨思维 梁玥卓 《制造业自动化》 2025年第6期75-84,共10页
随着FDM 3D打印技术的快速发展,各行业对打印效率和成型精度的要求日益提高。针对Delta结构FDM 3D打印机成型精度不足的问题,提出了一种基于BP神经网络与PID控制算法相结合的运动系统控制策略。通过将BP神经网络引入打印装置的运动控制... 随着FDM 3D打印技术的快速发展,各行业对打印效率和成型精度的要求日益提高。针对Delta结构FDM 3D打印机成型精度不足的问题,提出了一种基于BP神经网络与PID控制算法相结合的运动系统控制策略。通过将BP神经网络引入打印装置的运动控制系统,实现了控制参数的动态自适应调整,从而有效提升了打印过程的稳定性和精确性。实验结果表明,该控制策略显著降低了打印误差,改善了成型件的表面质量和尺寸精度。本研究为Delta结构FDM 3D打印机的精度提升提供了新的解决方案,对推动3D打印技术的发展具有重要的理论意义和实际应用价值。 展开更多
关键词 Delta结构 fdm 3D打印机 成型精度 控制方法
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基于FDM的多自由度3D打印技术研究 被引量:3
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作者 邢洪亚 陈继飞 《南方农机》 2025年第1期138-141,共4页
【目的】在学术研究与工业实践中,FDM型3D打印技术凭借其特有的分层叠加构造方法,极大地突破了传统零部件制造工艺中存在的约束和局限。然而,这种逐层构建的机制也带来了若干挑战,如阶梯效应显著以及需额外添加支撑结构等。【方法】为... 【目的】在学术研究与工业实践中,FDM型3D打印技术凭借其特有的分层叠加构造方法,极大地突破了传统零部件制造工艺中存在的约束和局限。然而,这种逐层构建的机制也带来了若干挑战,如阶梯效应显著以及需额外添加支撑结构等。【方法】为了克服传统层式打印技术所固有的局限性,研究人员提出了多自由度3D打印技术。文章对多自由度3D打印技术进行了系统性回顾,剖析了传统FDM型3D打印机所面临的一系列挑战与局限,介绍了增加打印机自由度的三种方法:(1)在原有的三个平动自由度的基础上,增加旋转自由度;(2)使用机械臂等串联机构;(3)使用delta型和stewart型等并联机构。【结果】基于FDM的多自由度3D打印技术是一个多学科融合的技术,硬件机械结构与软件控制系统是其两大支柱,因而该技术的未来发展需双管齐下,即在硬件与软件领域不断追求创新。【结论】具备高度灵活性的多自由度机器人在诸如多材料加工、原位制造、混合制造及闭环控制等方面也具有较高的研究价值。 展开更多
关键词 fdm 3D打印 多自由度 并联机构
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基于FSWT-FDM的露天矿爆破振动信号分解方法 被引量:1
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作者 孙冰 宋良灵 +2 位作者 曾晟 尹裕 罗志业 《金属矿山》 北大核心 2025年第7期106-113,共8页
针对高采样率下的爆破振动信号在采用傅里叶分解方法(Fourier Decomposition Method,FDM)处理时出现过度分解的问题,利用频率切片小波变换(Frequency Slice Wavelet Transform,FSWT)能提取任意频域信号的特点,提出了FSWT与FDM耦合的爆... 针对高采样率下的爆破振动信号在采用傅里叶分解方法(Fourier Decomposition Method,FDM)处理时出现过度分解的问题,利用频率切片小波变换(Frequency Slice Wavelet Transform,FSWT)能提取任意频域信号的特点,提出了FSWT与FDM耦合的爆破振动信号FSWT-FDM分解方法。采用正余弦函数模拟爆破振动信号,验证FSWT-FDM方法对信号的分解效果,并与FDM方法进行了对比。结果表明:与直接对信号进行FDM分解相比,采用FSWT-FDM方法的无效信号分量大幅减少,程序运行效率增加;使用FSWT提取的优势频带信号可以进一步进行傅里叶分解,且产生的信号分量与直接进行傅里叶分解的有效信号分量一致;以信号分量的相关系数和能量占比筛选出重构分量,重构信号的总能量、峰值振动速度、最大误差等指标证明FSWT-FDM方法有效保留了原始信号特征信息。通过对实测露天矿爆破振动信号的分析,验证了FSWT-FDM方法在保留原始信号时频特征的同时,减少了信号分解时的无效信号分量,为露天矿爆破振动信号分解提供了新思路。 展开更多
关键词 露天爆破 爆破振动信号 fdm FSWT 优势频带信号
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