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Prediction and Verification of Forming Limit Diagrams Based on a Modified Shear Failure Criterion 基于修正剪切破坏准则的成形极限图预测与验证
2区 工程技术 Q1 Engineering Pub Date : 2023-10-31 DOI: 10.1186/s10033-023-00954-x
Haibo Wang, Zipeng Wang, Yu Yan, Yuanhui Xu
Abstract The forming limit diagram plays an important role in predicting the forming limit of sheet metals. Previous studies have shown that, the method to construct the forming limit diagram based on instability theory of the original shear failure criterion is effective and simple. The original shear instability criterion can accurately predict the left area of the forming limit diagram but not the right area. In this study, in order to improve the accuracy of the original shear failure criterion, a modified shear failure criterion was proposed based on in-depth analysis of the original shear failure criterion. The detailed improvement strategies of the shear failure criterion and the complete calculation process are given. Based on the modified shear failure criterion and different constitutive equations, the theoretical forming limit of TRIP780 steel and 5754O aluminum alloy sheet metals are calculated. By comparing the theoretical and experimental results, it is shown that proposed modified shear failure criterion can predict the right area of forming limit more reasonably than the original shear failure criterion. The effect of the pre-strain and constitutive equation on the forming limits are also analyzed in depth. The modified shear failure criterion proposed in this study provides an alternative and reliable method to predict forming limit of sheet metals.
摘要成形极限图在预测板料成形极限方面起着重要作用。前人的研究表明,基于原剪切破坏准则的失稳理论构建成形极限图的方法是有效且简单的。原剪切失稳判据能准确预测成形极限图的左侧区域,但不能准确预测右侧区域。为了提高原剪切破坏准则的准确性,本研究在对原剪切破坏准则进行深入分析的基础上,提出了一种修正的剪切破坏准则。给出了剪切破坏准则的详细改进策略和完整的计算过程。基于修正的剪切破坏准则和不同的本构方程,计算了TRIP780钢和5754O铝合金板材的理论成形极限。理论与实验结果对比表明,所提出的修正剪切破坏准则比原剪切破坏准则能更合理地预测成形极限的正确区域。并对预应变和本构方程对成形极限的影响进行了深入分析。本文提出的修正剪切破坏准则为预测板料成形极限提供了一种可靠的替代方法。
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引用次数: 0
Material Removal Mechanism and Force Modeling in Ultrasonic Vibration-Assisted Micro-Grinding Biological Bone 超声振动辅助微磨生物骨材料去除机理及力建模
2区 工程技术 Q1 Engineering Pub Date : 2023-10-27 DOI: 10.1186/s10033-023-00957-8
Jingang Sun, Changhe Li, Zongming Zhou, Bo Liu, Yanbin Zhang, Min Yang, Teng Gao, Mingzheng Liu, Xin Cui, Benkai Li, Runze Li, Yusuf Suleiman Dambatta, Shubham Sharma
Abstract Micro-grinding with a spherical grinding head has been deemed an indispensable method in high-risk surgeries, such as neurosurgery and spine surgery, where bone grinding has long been plagued by the technical bottleneck of mechanical stress-induced crack damage. In response to this challenge, the ultrasound-assisted biological bone micro-grinding novel process with a spherical grinding head has been proposed by researchers. Force modeling is a prerequisite for process parameter determination in orthopedic surgery, and the difficulty in establishing and accurately predicting bone micro-grinding force prediction models is due to the geometric distribution of abrasive grains and the dynamic changes in geometry and kinematics during the cutting process. In addressing these critical needs and technical problems, the shape and protrusion heights of the wear particle of the spherical grinding head were first studied, and the gradual rule of the contact arc length under the action of high-speed rotating ultrasonic vibration was proposed. Second, the mathematical model of the maximum thickness of undeformed chips under ultrasonic vibration of the spherical grinding head was established. Results showed that ultrasonic vibration can reduce the maximum thickness of undeformed chips and increase the range of ductile and bone meal removals, revealing the mechanism of reducing grinding force. Further, the dynamic grinding behavior of different layers of abrasive particles under different instantaneous interaction states was studied. Finally, a prediction model of micro-grinding force was established in accordance with the relationship between grinding force and cutting depth, revealing the mechanism of micro-grinding force transfer under ultrasonic vibration. The theoretical model’s average deviations are 10.37% in x -axis direction, 6.85% in y -axis direction, and 7.81% in z -axis direction compared with the experimental results. This study provides theoretical guidance and technical support for clinical bone micro-grinding.
在神经外科和脊柱外科等高风险手术中,骨磨削一直受到机械应力裂纹损伤的技术瓶颈困扰,球面磨头微磨削已被认为是不可缺少的一种方法。针对这一挑战,研究人员提出了一种基于球形磨头的超声辅助生物骨微磨削新工艺。力建模是骨科手术工艺参数确定的前提,而骨微磨削力预测模型的建立和准确预测的难点在于磨料颗粒的几何分布以及切削过程中几何和运动学的动态变化。针对这些关键需求和技术问题,首先对球面磨头磨损颗粒的形状和突出高度进行了研究,提出了高速旋转超声振动作用下接触弧长渐变规律。其次,建立了球面磨头超声振动下最大未变形切屑厚度的数学模型;结果表明:超声振动可以减小未变形切屑的最大厚度,增大塑性和骨粉去除范围,揭示了减小磨削力的机理;进一步研究了不同磨粒层在不同瞬时相互作用状态下的动态磨削行为。最后,根据磨削力与切削深度的关系,建立了微磨削力的预测模型,揭示了超声振动下微磨削力传递的机理。与实验结果相比,理论模型在x轴方向上的平均偏差为10.37%,y轴方向上的平均偏差为6.85%,z轴方向上的平均偏差为7.81%。本研究为临床骨微磨提供理论指导和技术支持。
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引用次数: 0
Vote-Based Feature Selection Method for Stratigraphic Recognition in Tunnelling Process of Shield Machine 盾构机掘进过程地层识别的基于投票特征选择方法
2区 工程技术 Q1 Engineering Pub Date : 2023-10-24 DOI: 10.1186/s10033-023-00932-3
Liman Yang, Xuze Guo, Jianfu Chen, Yixuan Wang, Huaixiang Ma, Yunhua Li, Zhiguo Yang, Yan Shi
Abstract Shield machines are currently the main tool for underground tunnel construction. Due to the complexity and variability of the underground construction environment, it is necessary to accurately identify the ground in real-time during the tunnel construction process to match and adjust the tunnel parameters according to the geological conditions to ensure construction safety. Compared with the traditional method of stratum identification based on staged drilling sampling, the real-time stratum identification method based on construction data has the advantages of low cost and high precision. Due to the huge amount of sensor data of the ultra-large diameter mud-water balance shield machine, in order to balance the identification time and recognition accuracy of the formation, it is necessary to screen the multivariate data features collected by hundreds of sensors. In response to this problem, this paper proposes a voting-based feature extraction method (VFS), which integrates multiple feature extraction algorithms FSM, and the frequency of each feature in all feature extraction algorithms is the basis for voting. At the same time, in order to verify the wide applicability of the method, several commonly used classification models are used to train and test the obtained effective feature data, and the model accuracy and recognition time are used as evaluation indicators, and the classification with the best combination with VFS is obtained. The experimental results of shield machine data of 6 different geological structures show that the average accuracy of 13 features obtained by VFS combined with different classification algorithms is 91%; among them, the random forest model takes less time and has the highest recognition accuracy, reaching 93%, showing best compatibility with VFS. Therefore, the VFS algorithm proposed in this paper has high reliability and wide applicability for stratum identification in the process of tunnel construction, and can be matched with a variety of classifier algorithms. By combining 13 features selected from shield machine data features with random forest, the identification of the construction stratum environment of shield tunnels can be well realized, and further theoretical guidance for underground engineering construction can be provided.
摘要盾构机是目前地下隧道施工的主要工具。由于地下施工环境的复杂性和多变性,在隧道施工过程中需要实时准确地识别地面,根据地质条件匹配和调整隧道参数,以确保施工安全。与传统的分层钻井取样地层识别方法相比,基于施工数据的实时地层识别方法具有成本低、精度高等优点。由于超大直径泥水平衡盾构机的传感器数据量巨大,为了平衡对地层的识别时间和识别精度,需要对数百个传感器采集的多元数据特征进行筛选。针对这一问题,本文提出了一种基于投票的特征提取方法(VFS),该方法集成了多种特征提取算法FSM,所有特征提取算法中每个特征的出现频率是投票的依据。同时,为了验证该方法的广泛适用性,采用几种常用的分类模型对得到的有效特征数据进行训练和测试,并以模型精度和识别时间作为评价指标,得到了与VFS结合最优的分类。6种不同地质构造的盾构机数据实验结果表明,VFS结合不同分类算法得到的13个特征的平均准确率为91%;其中,随机森林模型耗时最短,识别准确率最高,达到93%,与VFS的兼容性最好。因此,本文提出的VFS算法对于隧道施工过程中的地层识别具有较高的可靠性和广泛的适用性,并且可以与多种分类器算法相匹配。将盾构机数据特征中选取的13个特征与随机森林相结合,可以很好地实现盾构隧道施工地层环境的识别,进一步为地下工程施工提供理论指导。
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引用次数: 0
Improving Ultrasonic Testing by Using Machine Learning Framework Based on Model Interpretation Strategy 基于模型解释策略的机器学习框架改进超声检测
2区 工程技术 Q1 Engineering Pub Date : 2023-10-23 DOI: 10.1186/s10033-023-00960-z
Siqi Shi, Shijie Jin, Donghui Zhang, Jingyu Liao, Dongxin Fu, Li Lin
Abstract Ultrasonic testing (UT) is increasingly combined with machine learning (ML) techniques for intelligently identifying damage. Extracting significant features from UT data is essential for efficient defect characterization. Moreover, the hidden physics behind ML is unexplained, reducing the generalization capability and versatility of ML methods in UT. In this paper, a generally applicable ML framework based on the model interpretation strategy is proposed to improve the detection accuracy and computational efficiency of UT. Firstly, multi-domain features are extracted from the UT signals with signal processing techniques to construct an initial feature space. Subsequently, a feature selection method based on model interpretable strategy (FS-MIS) is innovatively developed by integrating Shapley additive explanation (SHAP), filter method, embedded method and wrapper method. The most effective ML model and the optimal feature subset with better correlation to the target defects are determined self-adaptively. The proposed framework is validated by identifying and locating side-drilled holes (SDHs) with 0.5 λ central distance and different depths. An ultrasonic array probe is adopted to acquire FMC datasets from several aluminum alloy specimens containing two SDHs by experiments. The optimal feature subset selected by FS-MIS is set as the input of the chosen ML model to train and predict the times of arrival (ToAs) of the scattered waves emitted by adjacent SDHs. The experimental results demonstrate that the relative errors of the predicted ToAs are all below 3.67% with an average error of 0.25%, significantly improving the time resolution of UT signals. On this basis, the predicted ToAs are assigned to the corresponding original signals for decoupling overlapped pulse-echoes and reconstructing high-resolution FMC datasets. The imaging resolution is enhanced to 0.5 λ by implementing the total focusing method (TFM). The relative errors of hole depths and central distance are no more than 0.51% and 3.57%, respectively. Finally, the superior performance of the proposed FS-MIS is validated by comparing it with initial feature space and conventional dimensionality reduction techniques.
超声检测(UT)越来越多地与机器学习(ML)技术相结合,以智能识别损伤。从UT数据中提取重要特征对于有效的缺陷表征至关重要。此外,ML背后隐藏的物理是无法解释的,这降低了ML方法在UT中的泛化能力和通用性。为了提高UT的检测精度和计算效率,本文提出了一种基于模型解释策略的通用ML框架。首先,利用信号处理技术从UT信号中提取多域特征,构造初始特征空间;随后,将Shapley加性解释(SHAP)、滤波法、嵌入法和包装法相结合,创新地开发了一种基于模型可解释策略的特征选择方法(FS-MIS)。自适应地确定最有效的机器学习模型和与目标缺陷相关性更好的最优特征子集。通过识别和定位0.5 λ中心距离和不同深度的侧钻孔(sdh),验证了该框架的有效性。通过实验,采用超声阵列探头对含有两个sdh的多个铝合金试样进行FMC数据采集。将FS-MIS选择的最优特征子集作为所选ML模型的输入,用于训练和预测相邻sdh发射的散射波的到达时间(ToAs)。实验结果表明,预测toa的相对误差均在3.67%以下,平均误差为0.25%,显著提高了UT信号的时间分辨率。在此基础上,将预测toa赋给相应的原始信号,用于解耦重叠脉冲回波,重构高分辨率FMC数据集。采用全聚焦法(TFM)将成像分辨率提高到0.5 λ。孔深和中心距的相对误差分别不大于0.51%和3.57%。最后,通过与初始特征空间和传统降维技术的比较,验证了所提出的FS-MIS的优越性能。
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引用次数: 0
Construction of Human Digital Twin Model Based on Multimodal Data and Its Application in Locomotion Mode Identification 基于多模态数据的人体数字孪生模型构建及其在运动模式识别中的应用
2区 工程技术 Q1 Engineering Pub Date : 2023-10-20 DOI: 10.1186/s10033-023-00951-0
Ruirui Zhong, Bingtao Hu, Yixiong Feng, Hao Zheng, Zhaoxi Hong, Shanhe Lou, Jianrong Tan
Abstract With the increasing attention to the state and role of people in intelligent manufacturing, there is a strong demand for human-cyber-physical systems (HCPS) that focus on human-robot interaction. The existing intelligent manufacturing system cannot satisfy efficient human-robot collaborative work. However, unlike machines equipped with sensors, human characteristic information is difficult to be perceived and digitized instantly. In view of the high complexity and uncertainty of the human body, this paper proposes a framework for building a human digital twin (HDT) model based on multimodal data and expounds on the key technologies. Data acquisition system is built to dynamically acquire and update the body state data and physiological data of the human body and realize the digital expression of multi-source heterogeneous human body information. A bidirectional long short-term memory and convolutional neural network (BiLSTM-CNN) based network is devised to fuse multimodal human data and extract the spatiotemporal features, and the human locomotion mode identification is taken as an application case. A series of optimization experiments are carried out to improve the performance of the proposed BiLSTM-CNN-based network model. The proposed model is compared with traditional locomotion mode identification models. The experimental results proved the superiority of the HDT framework for human locomotion mode identification.
随着人们对智能制造中人的状态和作用的日益关注,关注人机交互的人-网络-物理系统(HCPS)的需求日益强烈。现有的智能制造系统不能满足高效的人机协同工作。然而,与配备传感器的机器不同,人的特征信息很难被即时感知和数字化。针对人体的高度复杂性和不确定性,提出了一种基于多模态数据的人体数字孪生(HDT)模型构建框架,并对其中的关键技术进行了阐述。建立数据采集系统,动态获取和更新人体的身体状态数据和生理数据,实现多源异构人体信息的数字化表达。设计了一种基于双向长短期记忆和卷积神经网络(BiLSTM-CNN)的多模态人体数据融合与时空特征提取网络,并以人体运动模式识别为应用实例。为了提高所提出的基于bilstm - cnn的网络模型的性能,进行了一系列优化实验。将该模型与传统的运动模式识别模型进行了比较。实验结果证明了HDT框架在人体运动模式识别中的优越性。
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引用次数: 0
Vision Sensing-Based Online Correction System for Robotic Weld Grinding 基于视觉传感的机器人焊缝磨削在线校正系统
2区 工程技术 Q1 Engineering Pub Date : 2023-10-20 DOI: 10.1186/s10033-023-00955-w
Jimin Ge, Zhaohui Deng, Shuixian Wang, Zhongyang Li, Wei Liu, Jiaxu Nie
Abstract The service cycle and dynamic performance of structural parts are affected by the weld grinding accuracy and surface consistency. Because of reasons such as assembly errors and thermal deformation, the actual track of the robot does not coincide with the theoretical track when the weld is ground offline, resulting in poor workpiece surface quality. Considering these problems, in this study, a vision sensing-based online correction system for robotic weld grinding was developed. The system mainly included three subsystems: weld feature extraction, grinding, and robot real-time control. The grinding equipment was first set as a substation for the robot using the WorkVisual software. The input/output (I/O) ports for communication between the robot and the grinding equipment were configured via the I/O mapping function to enable the robot to control the grinding equipment (start, stop, and speed control). Subsequently, the Ethernet KRL software package was used to write the data interaction structure to realize real-time communication between the robot and the laser vision system. To correct the measurement error caused by the bending deformation of the workpiece, we established a surface profile model of the base material in the weld area using a polynomial fitting algorithm to compensate for the measurement data. The corrected extracted weld width and height errors were reduced by 2.01% and 9.3%, respectively. Online weld seam extraction and correction experiments verified the effectiveness of the system’s correction function, and the system could control the grinding trajectory error within 0.2 mm. The reliability of the system was verified through actual weld grinding experiments. The roughness, Ra, could reach 0.504 µm and the average residual height was within 0.21 mm. In this study, we developed a vision sensing-based online correction system for robotic weld grinding with a good correction effect and high robustness.
焊接磨削精度和表面一致性影响结构件的使用周期和动态性能。由于装配误差、热变形等原因,焊缝脱机磨削时,机器人的实际轨迹与理论轨迹不重合,造成工件表面质量差。针对这些问题,本研究开发了一种基于视觉感知的机器人焊缝磨削在线校正系统。该系统主要包括焊缝特征提取、磨削和机器人实时控制三个子系统。首先使用WorkVisual软件将研磨设备设置为机器人的变电站。通过I/O映射功能配置机器人与研磨设备通信的输入/输出(I/O)端口,使机器人能够控制研磨设备(启动、停止、速度控制)。随后,利用以太网KRL软件包编写数据交互结构,实现机器人与激光视觉系统的实时通信。为了修正工件弯曲变形引起的测量误差,采用多项式拟合算法建立焊缝区域母材表面轮廓模型,对测量数据进行补偿。修正后的焊缝宽度和高度误差分别降低了2.01%和9.3%。在线焊缝提取与校正实验验证了该系统校正功能的有效性,该系统可将磨削轨迹误差控制在0.2 mm以内。通过实际焊接磨削试验,验证了该系统的可靠性。粗糙度Ra可达0.504µm,平均残余高度在0.21 mm以内。在本研究中,我们开发了一种基于视觉感知的机器人焊接磨削在线校正系统,该系统具有良好的校正效果和较高的鲁棒性。
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引用次数: 0
Revitalizing Human-Robot Interaction: Phygital Twin Driven Robot Avatar for China–Sweden Teleoperation 振兴人机交互:面向中瑞远程操作的虚拟孪生驱动机器人化身
2区 工程技术 Q1 Engineering Pub Date : 2023-10-19 DOI: 10.1186/s10033-023-00956-9
Huiying Zhou, Honghao Lv, Ruohan Wang, Haiteng Wu, Geng Yang
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引用次数: 0
New Technology of Multidirectional Loading Rotary Extrusion 多向加载旋转挤压新技术
2区 工程技术 Q1 Engineering Pub Date : 2023-10-19 DOI: 10.1186/s10033-023-00942-1
Zhimin Zhang, Yong Xue, Xing Zhang, Beibei Dong, Mei Cheng, Zhe Chen
Abstract To satisfy the requirements for the precise formation of large-scale high-performance lightweight components with inner ring reinforcement, a new multidirectional loading rotary extrusion forming technology is developed to match the linear motion with the rotary motion and actively increases the strong shear force. Its principle is that the radial force and rotating torque increase when the blank is axially extruded and loaded. Through the synergistic action of axial, radial, and rotating motions, the orderly flow of metal is controlled, and the cumulative severe plastic deformation (SPD) of an “uplift-trowel” micro-area is generated. Consequently, materials are uniformly strengthened and toughened. Simultaneously, through the continuous deformation of a punch “ellipse-circle,” a high reinforcement component is grown on the cylinder wall to achieve the high-quality formation of cylindrical parts or the inner-ring-reinforcement components. Additionally, the effective strain increases with rotation speed, and the maximum intensity on the basal plane decreases as the number of revolutions increase. The punch structure also affects the axial extrusion loading and equivalent plastic strain. Thus, the proposed technology enriches the plastic forming theory and widens the application field of plastic forming. Furthermore, the formed large-scale high-performance inner-ring-stiffened magnesium components have been successfully verified in aerospace equipment, thereby solving the problems of integral forming and severe deformation strengthening and toughening. The developed technology has good prospects for mass production and application.
摘要为满足大型高性能轻型内环增强件精密成形的要求,开发了一种新的多向加载旋转挤压成形技术,将直线运动与旋转运动相匹配,主动增加强剪切力。其原理是当毛坯轴向挤压和加载时,径向力和旋转扭矩增大。通过轴向运动、径向运动和旋转运动的协同作用,控制金属有序流动,产生“扬铲”微区累积严重塑性变形(SPD)。因此,材料被均匀强化和增韧。同时,通过冲头“椭圆-圆”的连续变形,在筒壁上生长出高配筋构件,实现圆柱件或内圈配筋构件的高质量成形。有效应变随转速增加而增大,基面上最大强度随转数增加而减小。冲头结构对轴向挤压载荷和等效塑性应变也有影响。从而丰富了塑性成形理论,拓宽了塑性成形的应用领域。成形的大型高性能内圈加筋镁合金构件在航空航天设备上得到了成功验证,从而解决了整体成形和剧烈变形强化增韧问题。所开发的技术具有良好的批量生产和应用前景。
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引用次数: 0
A Comparative Study on Kinematic Calibration for a 3-DOF Parallel Manipulator Using the Complete-Minimal, Inverse-Kinematic and Geometric-Constraint Error Models 基于完全最小误差、逆运动学误差和几何约束误差模型的三自由度并联机构运动学标定比较研究
2区 工程技术 Q1 Engineering Pub Date : 2023-10-18 DOI: 10.1186/s10033-023-00940-3
Haiyu Wu, Lingyu Kong, Qinchuan Li, Hao Wang, Genliang Chen
Abstract Kinematic calibration is a reliable way to improve the accuracy of parallel manipulators, while the error model dramatically affects the accuracy, reliability, and stability of identification results. In this paper, a comparison study on kinematic calibration for a 3-DOF parallel manipulator with three error models is presented to investigate the relative merits of different error modeling methods. The study takes into consideration the inverse-kinematic error model, which ignores all passive joint errors, the geometric-constraint error model, which is derived by special geometric constraints of the studied RPR-equivalent parallel manipulator, and the complete-minimal error model, which meets the complete, minimal, and continuous criteria. This comparison focuses on aspects such as modeling complexity, identification accuracy, the impact of noise uncertainty, and parameter identifiability. To facilitate a more intuitive comparison, simulations are conducted to draw conclusions in certain aspects, including accuracy, the influence of the S joint, identification with noises, and sensitivity indices. The simulations indicate that the complete-minimal error model exhibits the lowest residual values, and all error models demonstrate stability considering noises. Hereafter, an experiment is conducted on a prototype using a laser tracker, providing further insights into the differences among the three error models. The results show that the residual errors of this machine tool are significantly improved according to the identified parameters, and the complete-minimal error model can approach the measurements by nearly 90% compared to the inverse-kinematic error model. The findings pertaining to the model process, complexity, and limitations are also instructive for other parallel manipulators.
摘要运动标定是提高并联机器人精度的一种可靠方法,而误差模型对标定结果的精度、可靠性和稳定性影响很大。本文对三自由度并联机械臂的三种误差模型进行了运动学标定的比较研究,探讨了不同误差建模方法的优缺点。研究考虑了忽略所有被动关节误差的逆运动学误差模型、基于特定几何约束导出的几何约束误差模型和满足完备、极小和连续准则的完全最小误差模型。这种比较主要集中在建模复杂性、识别精度、噪声不确定性的影响和参数可识别性等方面。为了更直观地进行比较,我们进行了仿真,从精度、S接头的影响、噪声识别、灵敏度指标等方面得出结论。仿真结果表明,完全最小误差模型的残差最小,且在考虑噪声的情况下,所有误差模型都具有较好的稳定性。接下来,利用激光跟踪仪在样机上进行实验,进一步了解三种误差模型之间的差异。结果表明,根据识别的参数,该机床的残余误差得到了显著改善,与逆运动学误差模型相比,完全最小误差模型能接近测量值近90%。有关模型过程、复杂性和局限性的研究结果也对其他并联机械臂具有指导意义。
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引用次数: 0
Dynamic Simulation and Test Verification of Hydraulic Automatic Tensioner for an Engine Timing Chain Drive System 发动机正时链传动系统液压自动张紧器动态仿真与试验验证
2区 工程技术 Q1 Engineering Pub Date : 2023-10-18 DOI: 10.1186/s10033-023-00952-z
Zengming Feng, Jinxing Yang, Fei Wang
Abstract As a fundamental component of an automobile engine's timing chain drive system, the hydraulic automatic tensioner significantly enhances fuel economy while minimizing system vibrations and noise. However, there is a noticeable lack of research on automatic hydraulic tensioners. This study presents a comprehensive calculation approach for the principal parameters of a hydraulic automatic tensioner. An effective method, grounded in hydraulics and multibody dynamics, was introduced for estimating the dynamic response of such a tensioner. The simulation model developed for the hydraulic tensioner is characterized by its rapid dynamic response, consistent operation, and high accuracy. The dynamic behavior of the tensioner was analyzed under varying boundary conditions, using sinusoidal signal excitation. It was observed that the maximum damping force increases with a decreasing leakage gap. Conversely, an increase in oil temperature or air content leads to a decrease in the maximum damping force. The reaction forces derived from these calculations align well with experimental results. This calculation and simulation approach offers considerable value for the design of innovative hydraulic tensioners. It not only streamlines the design phase, minimizes the number of trials, and reduces product costs, but also provides robust insights for evaluating the performance of hydraulic tensioners.
液压自动张紧器作为汽车发动机正时链传动系统的基础部件,在降低系统振动和噪声的同时显著提高了燃油经济性。然而,对自动液压张紧器的研究明显缺乏。提出了一种液压自动张紧器主要参数的综合计算方法。介绍了一种基于水力学和多体动力学的有效方法来估计这种张紧器的动态响应。所建立的液压张紧器仿真模型具有动态响应快、运行一致、精度高等特点。采用正弦信号激励,分析了不同边界条件下张力器的动态特性。最大阻尼力随泄漏间隙的减小而增大。相反,油温或空气含量的增加会导致最大阻尼力的降低。由这些计算得到的反作用力与实验结果吻合得很好。这种计算和仿真方法对新型液压张紧器的设计具有重要的参考价值。它不仅简化了设计阶段,最大限度地减少了试验次数,降低了产品成本,而且还为评估液压张紧器的性能提供了强有力的见解。
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引用次数: 0
期刊
Chinese Journal of Mechanical Engineering
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