基于伤员运输舒适性的第四代轮式机动平台减振优化研究

发布时间：2018-03-03 04:25

本文选题：硅油弹簧减振器　切入点：刚度阻尼模型　出处：《中国人民解放军军事医学科学院》2017年博士论文　论文类型：学位论文

【摘要】：论文以改善第四代轮式陆基通用机动平台(以下简称四代平台)卧姿伤病员舒适性为目标,创新提出并试验验证了一种可控刚度阻尼的悬架装置——硅油弹簧减振器,并将其首次应用于四代平台平顺性的优化研究中。论文主要的研究工作和成果包括以下几个方面:1.硅油弹簧减振器的理论模型及试验研究根据硅油的压缩特性和粘滞阻尼特性,提出了可控刚度阻尼的硅油弹簧减振器原理和方案;基于硅油的体积弹性模量以及压力、含气量、温度、管道壁面变形的影响,首次提出并建立了稳态和瞬态状态下硅油的有效体积弹性模量模型;基于弹簧的动静态工作特性及硅油的有效体积弹性模量模型,首次研究并建立了硅油弹簧减振器的刚度数学模型。运用牛顿流体力学与非牛顿流体力学原理,建立了不同粘度硅油在层流和紊流下的粘滞阻尼力模型。通过对硅油弹簧减振器多参数分析,获得了影响其刚度阻尼特性的主要参数。分别研制了硅油弹簧减振器的原理样机和试验台架,通过对硅油弹簧减振器的性能试验,验证了理论模型的可靠性,并证明硅油弹簧减振器可以实现刚度和阻尼控制。2.基于硅油弹簧减振器的整车非线性振动系统研究利用频域法,对基于硅油弹簧减振器的八自由度整车非线性振动系统进行了分析,获得了在随机激励作用下乘员位置处垂直方向振动响应,并根据加速度功率谱密度的能量分布,确定了振动响应的主要来源与硅油弹簧减振器的刚度和阻尼有关;对影响硅油弹簧刚度和阻尼特性的主要参数进行了基于整车的动力学响应研究,通过参数灵敏度分析,获得了对乘员振动响应敏感的硅油弹簧减振器主要参数。3.基于伤员运输舒适性的整车多体动力学优化基于ADAMS/Car和Matlab/Simulink,建立了含有硅油弹簧减振器理论模型的四代平台虚拟样机;综合国际国内对振动状态下乘员舒适性的评价要求,提出了针对四代平台伤员运输舒适性的评价方法和评价指标;对基于硅油弹簧减振器的整车多体动力学模型进行了脉冲激励试验仿真和随机道路试验仿真,对仿真结果依据伤员运输舒适性的评价指标进行了分析,提出了优化要求。利用ADAMS/Insight软件,对基于硅油弹簧减振器的参数化整车模型进行了优化,优化后的结果表明,四种工况下卧姿乘员总加权加速度均方根值均明显小于目标值0.315m/s2,人体吸收功率均明显小于目标值0.3W,极大地改善了卧姿乘员的舒适性,达到了论文研究的目标。
[Abstract]:Aiming at improving the comfortableness of the 4th generation wheeled ground based general mobile platform (hereinafter referred to as the four generation platform), a suspension device with controllable stiffness damping, silicone oil spring damper, is proposed and tested in this paper. The main research work and results include the following aspects: 1. The theoretical model and experimental study of silicone oil spring absorber according to the compression characteristics and viscous damping characteristics of silicon oil. The principle and scheme of silicon oil spring damper with controllable stiffness damping are proposed, based on the influence of volume elastic modulus of silicon oil and pressure, gas content, temperature and wall deformation of pipeline. The effective volume elastic modulus model of silicon oil in steady and transient state is proposed and established for the first time, based on the dynamic and static characteristics of spring and the effective volume elastic modulus model of silicon oil. The stiffness mathematical model of silicon oil spring shock absorber is studied and established for the first time. The principles of Newtonian fluid mechanics and non-Newtonian fluid mechanics are used. The viscous damping force model of silicone oil with different viscosity under laminar and turbulent flow is established. The principle prototype and test stand of silicone oil spring damper are developed, and the reliability of the theoretical model is verified by the performance test of silicon oil spring damper. It is proved that the stiffness and damping control of silicon oil spring damper can be realized. 2. The frequency domain method is used to study the nonlinear vibration system of the whole vehicle based on the silicon oil spring damper. The nonlinear vibration system of an eight-degree-of-freedom vehicle based on silicone oil spring damper is analyzed. The vertical vibration response at the occupant's position under random excitation is obtained, and the energy distribution of the acceleration power spectral density is obtained. The main sources of vibration response are determined to be related to the stiffness and damping of silicone oil spring damper, the main parameters affecting the stiffness and damping characteristics of silicone oil spring are studied based on the dynamic response of the whole vehicle, and the sensitivity analysis of the parameters is carried out. The main parameters of silicone oil spring shock absorber sensitive to the occupant's vibration response are obtained. 3. Based on the comfort of the casualty transportation, the multi-body dynamics optimization of the whole vehicle based on ADAMS/Car and Matlab / Simulink is carried out, and a four-generation virtual prototype of the platform containing the theoretical model of the silicone oil spring damper is established. According to the evaluation requirements of passengers' comfort under vibration condition, the evaluation method and evaluation index for the transport comfort of the wounded on the fourth generation platform are put forward. The multi-body dynamic model based on silicone oil spring damper is simulated by pulse excitation test and random road test. The simulation results are analyzed according to the evaluation index of the transport comfort of the wounded. The optimization requirements are put forward. The parameterized vehicle model based on silicone oil spring damper is optimized by using ADAMS/Insight software. The optimized results show that, The root mean square value of the total weighted acceleration of the occupants in the four working conditions is obviously smaller than the target value of 0.315 m / s ~ (2), and the absorption power of the human body is obviously smaller than the target value of 0.3 W, which greatly improves the comfort of the occupants of the lying posture and achieves the purpose of the research in this paper.
【学位授予单位】：中国人民解放军军事医学科学院
【学位级别】：博士
【学位授予年份】：2017
【分类号】：R82

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