间隔阻尼层式支重轮应力—温度场双向耦合特性分析
发布时间：2018-11-23 07:22
【摘要】：本文是在教育部高等学校博士点基金项目——《工程机械粘弹性悬架热蚀模式及研究对策》资助下开展的相关研究工作。本文以履带式工程车辆间隔阻尼层式支重轮为研究对象,针对其受剧烈振动冲击易发生疲劳破坏和热失效等现象,采用应力场、温度场单独建模和应力场—温度场双向耦合有限元计算的方法,对其在双场耦合作用下的动态特性进行了分析;结果表明其1/4阻尼层轴对称端面易发生疲劳破坏及其间隔层与约束层粘接处易“热软化”;采取约束层和阻尼层均间断的方式对间隔阻尼层式支重轮结构进行了改进,并对改进后的结构做了应力场、温度场验证。 以某型300 kW履带式推土机为应用对象,在3种典型工况下(切土推土、松土和翻越障碍),分别建立1/4间隔阻尼层式支重轮三维轴对称有限元应力场和温度场模型。 对应力场和温度场模型采用双向耦合模式进行了有限元计算。经计算发现,支重轮在极限工况下应力过大,易造成疲劳破坏;1/4阻尼层轴对称端面处的应力较大且呈“直线”分布,易导致该处橡胶材料疲劳破坏;间隔层与约束层粘接处变形较大且温度较高,易造成此处橡胶材料“热软化”。 采用两种不同的阻尼层和约束层均间断的方式对间隔阻尼层式支重轮进行结构改进,经计算对比发现,沿着间隔层两端对约束层和阻尼层均间断的方式较为合理;经该方式改进的支重轮间隔阻尼层应力和温度分布较均匀对称且支重轮总耗散能较大;此结果表明这种改进方式不仅降低了支重轮发生疲劳破坏和热失效的概率,而且使其缓冲减振性能得到改善。然而改进后的支重轮在极限工况下应力仍较大,需提高其刚度以避免疲劳破坏;在不改变改进后支重轮原厚度的前提下,增加其约束层厚度,经计算发现,极限工况下其应力下降明显。 本文的研究思路和方法可为高性能支重轮的设计与改进提供参考。
[Abstract]:This paper is a research work supported by the doctoral Program Foundation of the Ministry of Education, "Thermal erosion model and research countermeasures for viscoelastic suspension of construction machinery". In this paper, the spacer damped laminar bearing wheel of tracked engineering vehicle is taken as the research object, and the stress field is adopted in view of the phenomenon that fatigue failure and thermal failure are easy to occur under the severe vibration shock. In this paper, the dynamic characteristics of the temperature field under the double field coupling are analyzed by the method of single modeling of temperature field and bidirectional coupling finite element method of stress field and temperature field. The results show that 1 / 4 of the damping layer is prone to fatigue failure on the axisymmetric end surface of the damping layer and the "thermal softening" of the interface between the interlayer and the confined layer is easy. The spaced damped laminar supporting wheel structure is improved by the discontinuity of restraint layer and damping layer, and the stress field and temperature field of the improved structure are verified. Taking a 300 kW crawler bulldozer as an application object, a three-dimensional axisymmetric finite element stress field model and a temperature field model of 1 / 4 interval damping laminar supporting wheel are established under three typical working conditions (soil cutting, soil loosening and surmounting obstacles). The two-way coupling model is used to calculate the corresponding force field and temperature field. It is found by calculation that the stress of the supporting wheel is too large under the limit condition, and that the stress at the axisymmetric end face of 1 / 4 damping layer is large and "linear" distribution, which can easily lead to the fatigue failure of the rubber material. The adhesion between the spacer and the confinement layer is characterized by large deformation and high temperature, which can easily cause the rubber material to be "hot softened". The structure of the spaced damped laminar supporting wheel is improved by two different ways of equally discontinuous damping layer and restraint layer. The results of calculation and comparison show that it is reasonable to discontinue the restraint layer and damping layer along the two ends of the spacer. The damping layer stress and temperature distribution of the spacer damping layer improved by this method is more uniform and symmetrical, and the total dissipative energy of the supporting wheel is larger. The results show that the improved method not only reduces the probability of fatigue failure and thermal failure of the bearing wheel, but also improves its damping and damping performance. However, the stress of the improved supporting wheel is still large under the limit condition, so it is necessary to improve its stiffness to avoid fatigue failure. On the premise of not changing the original thickness of the bearing wheel after the improvement, the thickness of the restraint layer is increased, and the stress decreases obviously under the limit condition. The research ideas and methods in this paper can provide a reference for the design and improvement of high performance supporting wheel.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH123.4
本文编号：2350755
[Abstract]:This paper is a research work supported by the doctoral Program Foundation of the Ministry of Education, "Thermal erosion model and research countermeasures for viscoelastic suspension of construction machinery". In this paper, the spacer damped laminar bearing wheel of tracked engineering vehicle is taken as the research object, and the stress field is adopted in view of the phenomenon that fatigue failure and thermal failure are easy to occur under the severe vibration shock. In this paper, the dynamic characteristics of the temperature field under the double field coupling are analyzed by the method of single modeling of temperature field and bidirectional coupling finite element method of stress field and temperature field. The results show that 1 / 4 of the damping layer is prone to fatigue failure on the axisymmetric end surface of the damping layer and the "thermal softening" of the interface between the interlayer and the confined layer is easy. The spaced damped laminar supporting wheel structure is improved by the discontinuity of restraint layer and damping layer, and the stress field and temperature field of the improved structure are verified. Taking a 300 kW crawler bulldozer as an application object, a three-dimensional axisymmetric finite element stress field model and a temperature field model of 1 / 4 interval damping laminar supporting wheel are established under three typical working conditions (soil cutting, soil loosening and surmounting obstacles). The two-way coupling model is used to calculate the corresponding force field and temperature field. It is found by calculation that the stress of the supporting wheel is too large under the limit condition, and that the stress at the axisymmetric end face of 1 / 4 damping layer is large and "linear" distribution, which can easily lead to the fatigue failure of the rubber material. The adhesion between the spacer and the confinement layer is characterized by large deformation and high temperature, which can easily cause the rubber material to be "hot softened". The structure of the spaced damped laminar supporting wheel is improved by two different ways of equally discontinuous damping layer and restraint layer. The results of calculation and comparison show that it is reasonable to discontinue the restraint layer and damping layer along the two ends of the spacer. The damping layer stress and temperature distribution of the spacer damping layer improved by this method is more uniform and symmetrical, and the total dissipative energy of the supporting wheel is larger. The results show that the improved method not only reduces the probability of fatigue failure and thermal failure of the bearing wheel, but also improves its damping and damping performance. However, the stress of the improved supporting wheel is still large under the limit condition, so it is necessary to improve its stiffness to avoid fatigue failure. On the premise of not changing the original thickness of the bearing wheel after the improvement, the thickness of the restraint layer is increased, and the stress decreases obviously under the limit condition. The research ideas and methods in this paper can provide a reference for the design and improvement of high performance supporting wheel.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH123.4
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