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Methods to improve motion servo control accuracy of pneumatic cylinders - review and prospect 提高气缸运动伺服控制精度的方法——综述与展望
IF 5.1 Q1 Engineering Pub Date : 2023-01-01 DOI: 10.1504/ijhm.2023.10057302
Luis Miguel Gómez Paez, Lei Liu, Chenwei Pu, De-yuan Meng, Pengfei Qian
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引用次数: 2
Robust active disturbance rejection control for modular fluidic soft actuators 模块化流体软执行器鲁棒自抗扰控制
Q1 Engineering Pub Date : 2023-01-01 DOI: 10.1504/ijhm.2023.10059853
Xuqu Hu, Yunce Zhang, Tao Wang
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引用次数: 0
A new stabilised curvature computation method using the level set function 一种利用水平集函数计算稳定曲率的新方法
Q1 Engineering Pub Date : 2023-01-01 DOI: 10.1504/ijhm.2023.134339
M. Sellam, K. Kannan, S. Natarajan
Computation of the curvature is an essential task during the simulation of processes such as bio-film growth and two-phase fluid flow wherein the interfacial forces play a crucial role in the determination of the state of stress. Existing methods for computing the curvature at the interface are not very accurate and exhibit unwanted numerical oscillations. In this work, a novel method is proposed to compute the mean curvature of the interface accurately. As opposed to Bruchon method which has only one stabilising term that can bias the results, the proposed method includes a pair of counteracting stabilising terms that remove any such bias. A comparative investigation of the proposed method with other existing techniques is also presented to demonstrate the superior performance. The paper also illustrates the application of the proposed curvature computation method for the flow through pipe problem in the last section.
在模拟生物膜生长和两相流体流动等过程中,曲率的计算是一项重要任务,其中界面力在确定应力状态方面起着至关重要的作用。现有的计算界面曲率的方法不是很精确,并且表现出不必要的数值振荡。本文提出了一种精确计算界面平均曲率的新方法。与Bruchon方法相反,Bruchon方法只有一个稳定项可以使结果产生偏差,该方法包括一对抵消稳定项,可以消除任何此类偏差。本文还将该方法与其他现有技术进行了对比研究,以证明其优越的性能。最后一节还举例说明了所提出的曲率计算方法在管道流动问题中的应用。
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引用次数: 0
An improved gated convolutional neural network for rolling bearing fault diagnosis with imbalanced data 基于改进门控卷积神经网络的不平衡滚动轴承故障诊断
Q1 Engineering Pub Date : 2023-01-01 DOI: 10.1504/ijhm.2023.130520
Changsheng Xi, Jie Yang, Xiaoxia Liang, Rahizar Bin Ramli, Shaoning Tian, Guojin Feng, Dong Zhen
To improve the ability of the deep learning model to handle imbalanced data, a fault diagnosis method based on improved gated convolutional neural network (IGCNN) is proposed. Firstly, an improved gated convolution layer is proposed for feature extraction, with the batch normalisation (BN) layer applied to adjust the data distribution and enhance the generalisation performance of the model. Then, the feature learned by multiple gated convolution layers and pooling layers is fed to the fully connected layer for fault type identification. Finally, the label-distribution-aware margin (LDAM) loss function is employed to adjust the model being more sensitive to the minority class and mitigate the influence of imbalanced data on the model. Experimental validation is conducted using two bearing datasets. Results show that the proposed method is more robust than other fault diagnosis methods, with higher recognition accuracy in severely imbalanced dataset.
为了提高深度学习模型处理不平衡数据的能力,提出了一种基于改进门控卷积神经网络(IGCNN)的故障诊断方法。首先,提出了一种改进的门控卷积层用于特征提取,并采用批处理归一化(BN)层调整数据分布,增强模型的泛化性能;然后,将多个门控卷积层和池化层学习到的特征馈送到全连接层进行故障类型识别。最后,利用标签分布感知边际损失函数(LDAM)调整模型,使其对少数类更敏感,减轻不平衡数据对模型的影响。利用两个轴承数据集进行了实验验证。结果表明,该方法比其他故障诊断方法具有更强的鲁棒性,在严重不平衡数据集中具有更高的识别精度。
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引用次数: 4
A mayfly optimisation method to predict load settlement of reinforced railway tracks on soft subgrade with multi-layer geogrid 多层土工格栅软基加筋铁路轨道荷载沉降预测的苍蝇优化方法
IF 5.1 Q1 Engineering Pub Date : 2023-01-01 DOI: 10.1504/ijhm.2023.10055033
M. Balasubramani, R. Venkatakrishnaiah, K. Raju
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引用次数: 0
Model adaptive collision detection for flexible joint manipulator based on state observer 基于状态观测器的柔性关节机械手模型自适应碰撞检测
IF 5.1 Q1 Engineering Pub Date : 2023-01-01 DOI: 10.1504/ijhm.2023.10056146
Sun Yongjun, C. Gerada, Liu Yiwei, Cui Shipeng
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引用次数: 0
A new stabilized curvature computation method using the level set function 一种利用水平集函数计算稳定曲率的新方法
IF 5.1 Q1 Engineering Pub Date : 2023-01-01 DOI: 10.1504/ijhm.2023.10058581
S. Natarajan, K. Kannan, M. Sellam
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引用次数: 0
Applications of level set method in computational fluid dynamics: a review 水平集方法在计算流体力学中的应用综述
Q1 Engineering Pub Date : 2023-01-01 DOI: 10.1504/ijhm.2023.129126
Hongwei Ning, Shizhi Qian, Teng Zhou
Tracking of free interfaces in two-phase and multi-phase fluids is a critical step in computational fluid dynamics. Among the many methods, because of no need for parameterisation of curves and an excellent solution to the problem of evolutionary curve topology change, the level set method (LSM) is widely used in the field and has achieved good results. The paper reviews applications of LSM in the tracking of free interfaces, including theory fundamental, solving the basic partial differential equation used to represent fluids in LSM, free interfaces tracking of two-phase fluids, interfaces evolutions of multi-phase fluids, and coupling with other methods to increase tracking performance. Based on the summaries, we confirm the level set method has achieved excellent results in fluid interface tracking either alone or coupled with other algorithms. Of course, the level set method requires further optimisation in terms of initialisation and mass conservation.
两相和多相流体中自由界面的跟踪是计算流体动力学中的一个关键步骤。在众多方法中,水平集方法由于不需要对曲线进行参数化,并且很好地解决了曲线拓扑变化的演化问题,在该领域得到了广泛的应用,并取得了良好的效果。本文综述了LSM在自由界面跟踪中的应用,包括理论基础、求解LSM中表示流体的基本偏微分方程、两相流体的自由界面跟踪、多相流体的界面演变以及与其他方法的耦合以提高跟踪性能。综上所述,我们证实水平集方法无论是单独使用还是与其他算法结合使用,在流体界面跟踪方面都取得了很好的效果。当然,水平集方法需要在初始化和质量守恒方面进一步优化。
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引用次数: 1
3D profile-based pothole segmentation and quantification 基于三维剖面的坑穴分割与量化
IF 5.1 Q1 Engineering Pub Date : 2023-01-01 DOI: 10.1504/ijhm.2023.10057576
Anthony Guo, X. Wang, Xu Yang, Jinchao Guan, Zhihao Pan
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引用次数: 0
Hybrid model-driven and data-driven approach for the health assessment of axial piston pumps 轴向柱塞泵健康评估的模型驱动和数据驱动混合方法
Q1 Engineering Pub Date : 2023-01-01 DOI: 10.1504/ijhm.2023.129123
Qun Chao, Zi Xu, Yuechen Shao, Jianfeng Tao, Chengliang Liu, Shuo Ding
Axial piston pumps are key components in hydraulic systems and their performance significantly affects the efficiency and reliability of hydraulic systems. Many data-driven approaches have been applied to the fault diagnosis of axial piston pumps. However, few studies focus on the performance degradation assessment that plays an important role in the predictive maintenance for axial piston pumps. This paper proposes a hybrid model-driven and data-driven approach to assess the health status of axial piston pumps. A physical flow loss model is established to solve for the flow loss coefficients of the axial piston pump under different operating conditions. The flow loss coefficients act as feature vectors to train a support vector data description (SVDD) model. A health indicator based on SVDD is put forward to quantitatively assess the pump health status. Experimental results under different pump health conditions confirm the effectiveness of the proposed method.
轴向柱塞泵是液压系统的关键部件,其性能直接影响液压系统的工作效率和可靠性。许多数据驱动方法已经应用于轴向柱塞泵的故障诊断。然而,轴向柱塞泵的性能退化评估在轴向柱塞泵的预测性维护中起着重要的作用,相关研究很少。提出了一种模型驱动和数据驱动相结合的轴向柱塞泵健康状态评估方法。建立了物理流动损失模型,求解了轴向柱塞泵在不同工况下的流动损失系数。流动损失系数作为特征向量来训练支持向量数据描述(SVDD)模型。提出了一种基于SVDD的泵健康状态定量评价指标。在不同泵健康状况下的实验结果证实了该方法的有效性。
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引用次数: 7
期刊
International Journal of Hydromechatronics
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