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| 1 | 基于Ansys/LS-DYNA的缓冲气囊着陆过程仿真研究显示文摘目的以冲压式快速空投硬式气囊为研究对象,对气囊以特定角度着陆时的缓冲过程进行仿真分析。方法使用SolidWorks软件建立气囊的仿真模型,然后使用Ansys/LS-DYNA有限元分析软件,分别从气囊的材料定义、有限元模型的构建和仿真结果分析等方面进行仿真研究,并得出冲压式快速空投气囊着陆过程中应力应变的动态参数,以及货物和气囊的冲击加速度波动曲线。结果气囊在偏离竖直轴15°着陆缓冲过程中,在0.077 207 s时,地面与气囊的棱接触处受到的最大应力为1.47MPa,此时对应的最大应变为0.479 614 m。结论冲压式快速空投气囊在偏离竖直轴15°着陆时,气囊所受的最大冲击应力以1.47 MPa为标准,可更好地确定空投物体的质量,并且可以针对性地加强对气囊应力应变较大区域的防护,防止气囊在冲击过程中破坏。 | 齐明思 刘守君 赵奇 张峰 | 2014 | 包装工程2014，35，11： | 11 |
| 2 | Design and Optimization for the Occupant Restraint System of Vehicle Based on a Single Freedom Model显示文摘Throughout the vehicle crash event, the interactions between vehicle, occupant, restraint system (VOR) are complicated and highly non-linear. CAE and physical tests are the most widely used in vehicle passive safety development, but they can only be done with the detailed 3D model or physical samples. Often some design errors and imperfections are difficult to correct at that time, and a large amount of time will be needed. A restraint system concept design approach which based on single-degree-of-freedom occupant-vehicle model (SDOF) is proposed in this paper. The interactions between the restraint system parameters and the occupant responses in a crash are studied from the view of mechanics and energy. The discrete input and the iterative algorithm method are applied to the SDOF model to get the occupant responses quickly for arbitrary excitations (impact pulse) by MATLAB. By studying the relationships between the ridedown efficiency, the restraint stiffness, and the occupant response, the design principle of the restraint stiffness aiming to reduce occupant injury level during conceptual design is represented. Higher ridedown efficiency means more occupant energy absorbed by the vehicle, but the research result shows that higher ridedown efficiency does not mean lower occupant injury level. A proper restraint system design principle depends on two aspects. On one hand,the restraint system should lead to as high ridedown efficiency as possible, and at the same time, the restraint system should maximize use of the survival space to reduce the occupant deceleration level. As an example, an optimization of a passenger vehicle restraint system is designed by the concept design method above, and the final results are validated by MADYMO, which is the most widely used software in restraint system design, and the sled test. Consequently, a guideline and method for the occupant restraint system concept design is established in this paper. | ZHANG Junyuan MA Yue CHEN Chao ZHANG Yan | 2013 | Chinese Journal of Mechanical Engineering2013，26，3： | 5 |
| 3 | 着陆气囊缓冲过程数值模拟研究显示文摘目的对某大型空降装备着陆缓冲系统的可排气型气囊缓冲过程进行数值模拟研究。方法基于有限元方法,建立着陆缓冲系统的有限元模型,采用控制体积法,利用显式动力分析软件LS-DYNA对着陆气囊的缓冲过程进行数值模拟,分析了气囊缓冲过程中气囊内压、气囊剩余高度和气囊排气速率等特性的变化规律,以及气囊织布的弹性模量、排气压力和排气口面积等主要参数变化时对气囊缓冲特性的影响规律。结果对气囊的缓冲特性影响较大的参数为气囊的排气压力和排气口面积,当气囊织布的弹性模量高于0.2 GPa时,弹性模量的变化对气囊的缓冲特性影响较小。结论研究结果可为工程人员进行气囊初始设计和对气囊缓冲过程进行模拟仿真提供参考。 | 何健 马吉胜 吴大林 邓士杰 孙也尊 | 2015 | 包装工程2015，36，13： | 4 |
| 4 | Establishment and Validation for the Theoretical Model of the Vehicle Airbag显示文摘The current design and optimization of the occupant restraint system(ORS) are based on numerous actual tests and mathematic simulations. These two methods are overly time-consuming and complex for the concept design phase of the ORS, though they're quite effective and accurate. Therefore, a fast and directive method of the design and optimization is needed in the concept design phase of the ORS. Since the airbag system is a crucial part of the ORS, in this paper, a theoretical model for the vehicle airbag is established in order to clarify the interaction between occupants and airbags, and further a fast design and optimization method of airbags in the concept design phase is made based on the proposed theoretical model. First, the theoretical expression of the simplified mechanical relationship between the airbag's design parameters and the occupant response is developed based on classical mechanics, then the momentum theorem and the ideal gas state equation are adopted to illustrate the relationship between airbag's design parameters and occupant response. By using MATLAB software, the iterative algorithm method and discrete variables are applied to the solution of the proposed theoretical model with a random input in a certain scope. And validations by MADYMO software prove the validity and accuracy of this theoretical model in two principal design parameters, the inflated gas mass and vent diameter, within a regular range. This research contributes to a deeper comprehension of the relation between occupants and airbags, further a fast design and optimization method for airbags' principal parameters in the concept design phase, and provides the range of the airbag's initial design parameters for the subsequent CAE simulations and actual tests. | ZHANG Junyuan JIN Yang XIE Lizhe CHEN Chao | 2015 | Chinese Journal of Mechanical Engineering2015，28，3： | 2 |
| 5 | 某空降自行火炮着陆过程动力学仿真研究显示文摘在空降火炮着陆速度优化控制的研究中,针对某空降型自行火炮着陆过程,进行抗冲击振动试验,为了解决实装空投试验时间长、风险大以及试验条件不可控等问题,利用计算多体系统动力学,运用虚拟样机技术建立了火炮虚拟样机模型;对着陆气囊缓冲过程进行数值仿真,将气囊缓冲作用以8个关于火炮下降高度的非线性作用力添加在火炮模型上。对火炮着陆过程虚拟样机模型进行了仿真分析,得到火炮着陆过程的动态参数,通过实装模拟空投的试验数据验证了模型的有效性,接着分析了着陆姿态不同对火炮所受到的冲击加速度的影响。通过仿真可以节约时间和成本,可为大型空降装备的抗冲击振动优化控制试验提供参考。 | 何健 马吉胜 吴大林 邓士杰 | 2016 | 计算机仿真2016，33，2： | 1 |
| 6 | Investigation on the Folding Mode and Deployment Process of an Inflatable Boarding Platform for the Marine Emergency Evacuation System显示文摘Monopiles are the most common foundation form of offshore wind turbines,which bear the vertical load,lateral load and bending moment.It remains uncertain whether the applied vertical load increases the lateral deflection of the pile.This paper investigated the influence of vertical load on the behaviour of monopiles installed in the sand under combined load using three-dimensional numerical methods.The commercial software PLAXIS was used for simulations in this paper.Monopiles were modelled as a structure incorporating linear elastic material behaviour and soil was modelled using the Hardening-Soil(HS)constitutive model.The monopiles under vertical load,lateral load and combined vertical and lateral loads were respectively studied taking into account the sequence of load application and pile slenderness ratio(L/D;L and D are the length and diameter of the pile).Results suggest that the sequence of load application plays a major role in how vertical load affects the deflection behaviour of the pile.Specifically,when L/D ratios obtained by lengthening the pile while keeping its diameter constant are 3,5 and 8,the relationships between lateral load and the deflection behaviour of the pile under the effect of vertical load demonstrate a similar trend.Furthermore,the cause of increased lateral capacity of the pile under the action of applied vertical load in the common practical application case and in the VPL case was analyzed by studying the variation law of soil stress along the pile embedment.Results confirm that the confining effect of vertical load increases means effective stress of the soil around the pile,thus increasing soil stiffness and pile capacity. | Qiang Li Pan Chen Lihong Gao Dan Meng Jinjie Zou | 2023 | Computer Modeling in Engineering & Sciences2023，，4： | 0 |
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