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Numerical simulation and analysis on the flow field structure and hard rock erosion potential of a disc-slotted pulse water jet 盘式开槽脉冲水射流流场结构及硬岩侵蚀势的数值模拟与分析
Q3 Physics and Astronomy Pub Date : 2017-10-15 DOI: 10.13465/J.CNKI.JVS.2017.19.028
Zhaohui Lu, Yiyu Lu, M. Hood, Pan Linhua, Pei He
A disc-slotted pulse water jet is a potential tool to break hard rock due to its special loading styles, such as the water hammer pressure, ultra-speed lateral jetting and pulse dynamic load etc. Aiming at investigating the flow filed of the jet, a two-phase-flow transient computational model, matching with the geometry and motion of the interrupted water jet generating device, was established to simulate the dynamic evolution and characteristics of a single pulsation within 100 mm standoff based on the volume of fluid (VOF) model and dynamic mesh theory. The results show that at the head of the pulsed jet forms a deflective slug structure which is consistent with the result from high-speed photography experiments. The slug head velocity is lower than that at the jet outlet and the jet turbulence is mainly distributed over boundary layers between jet and air and at the deflective side. Tile-shaped stereo-structure is yielded during the pulse formation process. It presents non-axisymmetric flow pattern when impacting target, which consists with the irregular erosion cavity obtained by hard rock fragmentation experiments.
由于水锤压力、超高速横向喷射和脉冲动载荷等特殊的加载方式,圆盘缝脉冲水射流是一种有潜力的破岩工具。针对射流流场的研究,基于流体体积(VOF)模型和动态网格理论,建立了与间断水射流产生装置的几何形状和运动相匹配的两相流瞬态计算模型,模拟了100 mm间隙内单次脉动的动态演变和特性。结果表明,在脉冲射流的头部形成偏转的段塞结构,这与高速摄影实验结果一致。段塞头速度低于射流出口速度,射流湍流主要分布在射流与空气的边界层和偏转侧。在脉冲形成过程中产生了瓦片状的立体结构。冲击目标时呈现非轴对称流型,与硬岩破碎实验得到的不规则冲蚀空腔相一致。
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引用次数: 5
Modal parametric identification of distribution type structures based on random decrement technique 基于随机减量技术的分布型结构模态参数辨识
Q3 Physics and Astronomy Pub Date : 2017-09-15 DOI: 10.13465/J.CNKI.JVS.2017.17.008.HTML
Jingzhou Lu, S. Sim, B. Spencer
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引用次数: 0
Finite element analysis of the effect of material properties on human thoracic impact response 材料性能对人体胸部冲击反应影响的有限元分析
Q3 Physics and Astronomy Pub Date : 2016-01-01 DOI: 10.13465/j.cnki.jvs.2016.08.015
Fang Wang, Yong Han, Guibing Li, Jikuang Yang
The purpose of the current study was to analyze the influence of changes of the material of the human thoracic skeleton and soft tissues on the thorax responses under frontal impact loading conditions. A series of human thorax impact simulations were conducted based on a developed and validated human thorax finite element (FE) model. A number of thoracic response parameters were output to investigate the effect of material property changes on the predicted thoracic responses by using polynomial fitting analysis. The results of the simulations indicated that varying thoracic material properties affects the impact responses with different level. The impact force (Fmax) and chest deflection (Dmax) were obviously affected, and the number of rib fractures (NRF) and T12 accelerations (Gmax-T12) were additionally affected by the material properties. However, the influences of the material properties on the deflection rate (Vmax) and T1 acceleration (Gmax-T1) were small. Specifically, the Fmax, Dmax, and Gmax-T12 were mainly influenced by the soft tissue material properties, while the NRF was primarily determined by the thoracic skeletal structure material properties.
本研究的目的是分析在正面冲击载荷条件下,人体胸腔骨骼和软组织材料的变化对胸腔反应的影响。基于开发并验证的人体胸腔有限元模型,进行了一系列人体胸腔撞击仿真。通过多项式拟合分析,输出多个胸廓响应参数,探讨材料性能变化对胸廓响应预测的影响。仿真结果表明,不同胸廓材料性能对冲击响应的影响程度不同。冲击力(Fmax)和胸椎挠度(Dmax)受材料性能影响较大,肋骨断裂数(NRF)和T12加速度(Gmax-T12)受材料性能影响较大。而材料性能对变形速率(Vmax)和T1加速度(Gmax-T1)的影响较小。其中,Fmax、Dmax和Gmax-T12主要受软组织材料性能的影响,而NRF主要受胸椎骨骼结构材料性能的影响。
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引用次数: 1
The study of acoustic emission monitoring for contact state of seal end faces 密封端面接触状态的声发射监测研究
Q3 Physics and Astronomy Pub Date : 2016-01-01 DOI: 10.13465/J.CNKI.JVS.2016.08.014
Xiaohui Li, P. Fu, Lt, strong gt, Weiqing Cao, Kan Chen
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引用次数: 2
Pedestrian lower extremity injury risk in car-pedestrian collisions 汽车-行人碰撞中行人下肢损伤的风险
Q3 Physics and Astronomy Pub Date : 2016-01-01 DOI: 10.13465/J.CNKI.JVS.2016.23.001
B. Wang, Jikuang Yang, D. Otte, F. Wang
Here, the pedestrian lower extremity injury risk was studied using the real world accident data. For this purpose, 354 cases with pedestrian lower extremity injuries selected from the german in-depth accident study(GIDAS) database were used to conduct the one-way variance analysis to determine the effects of impact speed, pedestrian age, height and weight on the pedestrian serious lower extremity injuries risk. Then, the pedestrian serious lower extremity injury risk model was established. The results showed that the impact speed and pedestrian age are significant factors affecting pedestrian lower extremity serious injuries, but the pedestrian weight and height are not; the risk of injury is positively related to impact speed and pedestrian age; the pedestrian serious lower extremity injury risk reaches 50% when the impact speed is 43 km/h.
本研究采用真实事故数据对行人下肢损伤风险进行研究。为此,从德国深度事故研究(GIDAS)数据库中选取354例行人下肢损伤病例,进行单因素方差分析,确定碰撞速度、行人年龄、身高和体重对行人严重下肢损伤风险的影响。然后,建立了行人严重下肢损伤风险模型。结果表明:冲击速度和行人年龄是影响行人下肢严重损伤的显著因素,而行人体重和身高影响不显著;损伤风险与碰撞速度和行人年龄呈正相关;当碰撞速度为43 km/h时,行人严重下肢损伤的风险达到50%。
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引用次数: 8
Fault diagnosis method based on sensitive feature selection and manifold learning dimension reduction 基于敏感特征选择和流形学习降维的故障诊断方法
Q3 Physics and Astronomy Pub Date : 2014-01-01 DOI: 10.13465/J.CNKI.JVS.2014.03.014
Lt, strong gt, Zuqiang Su, B. Tang, Jinbao Yao
A fault diagnosis method based on feature selection( FS) and linear local tangent space alignment( LLTSA) was proposed,aiming at solving the problem that there are non-sensitive features and over-high dimensions in the feature set of a fault diagnosis. Firstly,improved kernel distance measurement feature selection method( IKDM-FS) was proposed considering both the distance between classes and the dispersion within a class,and the selected sensitive features were weighted with their sensitive-values. The weighted sensitive feature subset was compressed with LLTSA to reduce its dimensions and get the compressed more sensitive feature subset. Then,the feature subset was fed into a weighted k nearest neighbor classifier( WKNNC) to recognize the fault type,its recognition accuracy was more stable compared with that of a k nearest neighbor classification( KNNC). At last,the validity of the proposed method was verified with fault diagnosis tests of a rolling bearing.
针对故障诊断中特征集存在非敏感特征和维数过高的问题,提出了一种基于特征选择(FS)和线性局部切空间对齐(LLTSA)的故障诊断方法。首先,提出了同时考虑类间距离和类内离散度的改进核距离度量特征选择方法(IKDM-FS),并对选择的敏感特征进行敏感值加权;利用LLTSA对加权敏感特征子集进行压缩,降低其维数,得到压缩后更敏感的特征子集。然后,将特征子集输入加权k近邻分类器(WKNNC)进行故障类型识别,其识别精度比k近邻分类器(KNNC)更稳定。最后,通过滚动轴承故障诊断试验验证了所提方法的有效性。
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引用次数: 10
Coupling characteristic analysis of a large hydraulic centrifugal shaker 大型液压离心振动筛耦合特性分析
Q3 Physics and Astronomy Pub Date : 2014-01-01 DOI: 10.13465/J.CNKI.JVS.2014.11.004
Lu Zhong-bao, Yang Zhidong, Cong Dacheng, Z. Bing
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引用次数: 0
Experimental study on bridge damage identification based on wavelet packet energy curvature difference method 基于小波包能量曲率差法的桥梁损伤识别实验研究
Q3 Physics and Astronomy Pub Date : 2013-01-01 DOI: 10.1201/b15963-414
Zhu Yu, H. Xia, J. G. Ruigómez, J. Zhan
Among various damage identification methods,the Wavelet Packet Energy Curvature Difference (WPECD) method is an effective one.As a regret,most of the existing methods rely only on numerical simulation and are unverified via experiment,and moreover very few of them has been applied to practice.In the paper,the validity of WPECD in structural damage identification was verified by a numerical example.A damage simulation experiment was taken on a real replaced girder at the Ziya River New Bridge in Cangzhou.Two damage cases were simulated and the acceleration responses at the measuring points were obtained,based on which the damages were identified with the WPECD method,and the influences of wavelet function and decomposition level were studied.The results show that the WPECD method can identify structure damage efficiently and can be put into practice.
在各种损伤识别方法中,小波包能量曲率差(WPECD)方法是一种有效的损伤识别方法。遗憾的是,现有的方法大多只依赖于数值模拟,没有经过实验验证,而且很少有实际应用。通过数值算例验证了WPECD在结构损伤识别中的有效性。对沧州紫牙河新桥某实际更换主梁进行了损伤模拟试验。模拟了两种损伤情况,得到了测点处的加速度响应,在此基础上采用WPECD方法对损伤进行识别,研究了小波函数和分解水平对损伤识别的影响。结果表明,WPECD方法可以有效地识别结构损伤,具有一定的应用价值。
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引用次数: 4
Coupled Vibration Analysis of Railway Continuous BEAM Bridge and Vehicles with Soil-Structure Interaction 考虑土-结构相互作用的铁路连续梁桥与车辆耦合振动分析
Q3 Physics and Astronomy Pub Date : 2012-01-01 DOI: 10.1007/978-3-642-27960-7_37
Xiaozhen Li, Xiao Han Liu, Dejun Liu
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引用次数: 2
1C25 Influence of Initial SRO and DTV on Brake Judder Based on the Disc Brake Model with Multi-points Contact 基于多点接触盘式制动模型的初始SRO和DTV对制动抖动的影响
Q3 Physics and Astronomy Pub Date : 2010-08-17 DOI: 10.1299/JSMEMOVIC.2010._1C25-1_
Z. Lijun, Meng Dejian, Yu Zhuoping
For a disc brake system,the couples of brake disc and brake pads were supposed to be multi-point contact,and the brake dynamic model with multi-point contact was established considering a semi-empirical theoretical model of a friction coefficient-relative speed curve,which was verified by the rig experiment.Based on the model,assuming that the initial DTV and SRO could be represented mathematically as sinusoidal functions,the influence of the order,the maximum value and the phase of the initial DTV and SRO on brake judder were discussed in detail using the evaluation indicators of the time-frequency characteristics and the root mean square of the BPV and BTV.The results showed that the order of the DTV produces the order for the frequency of the BPV and BTV versus the angular velocity;the BPV has the stronger sensitivity to the SRO and the BTV has the stronger sensitivity to the DTV;the roots mean square of the BPV and BTV have linear incremental relations to the maximum values of the SRO and DTV;the phase of the SRO influences the BPV and BTV by changing the maximum value of the DTV.
针对盘式制动系统,假定制动盘与刹车片的耦合为多点接触,采用摩擦系数相对速度曲线的半经验理论模型,建立了多点接触的制动动力学模型,并通过台架试验进行了验证。在此模型的基础上,假设初始DTV和SRO可以用正弦函数表示,利用BPV和BTV的时频特性评价指标和均方根,详细讨论了初始DTV和SRO的阶数、最大值和相位对制动抖动的影响。结果表明:DTV的阶数决定了BPV和BTV的频率与角速度的顺序;BPV对SRO的敏感性更强,BTV对DTV的敏感性更强;BPV和BTV的均方根与SRO和DTV的最大值呈线性增量关系;SRO的相位通过改变DTV的最大值来影响BPV和BTV。
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引用次数: 1
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振动与冲击
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