Bionic Design and Simulation Analysis of Energy⁃Efficient and Vibration⁃Damping Walking Mechanism

African ostrich can run for 30 min at a speed of 60 km/h in the desert,and its hindlimb has excellent energy saving and vibration damping performance.In order to realize the energy⁃efficient and vibration⁃damping design of the leg mechanism of the legged robot,the principle of engineering bionics was applied.According to the passive rebound characteristic of the intertarsal joint of the ostrich foot and the characteristic of variable output stiffness of the ostrich hindlimb,combined with the proportion and size of the structure of the ostrich hindlimb,the bionic rigid⁃flexible composite legged robot single⁃leg structure was designed.The locomotion of the bionic mechanical leg was simulated by means of ADAMS.Through the motion simulation analysis,the influence of the change of the inner spring stiffness coefficient within a certain range on the vertical acceleration of the body centroid and the motor power consumption was studied,and the optimal stiffness coefficient of the inner spring was obtained to be 200 N/mm,and it was further verified that the inner and outer spring mechanism could effectively reduce the energy consumption of the mechanical leg.Simulation results show that the inner and outer spring mechanism could effectively reduce the motor energy consumption by about 72.49%.

矿用发动机散热风扇仿生多层阻尼叶片结构研究

针对矿用发动机散热风扇的颤振抖动问题,采用结构仿生的方法,借鉴毛竹竹壁层和结构,提出了一种仿生多层阻尼结构叶片。基于振动力学理论,建立并解析该结构的动力学模型,结合某型矿用发动机散热风扇,设计叶片的仿生多层阻尼结构,运用有限元软件仿真分析仿生多层阻尼结构叶片的动力学响应。结果表明,2层阻尼结构叶片的散热风扇抑振效果更显著。仿生多层阻尼结构可成为矿用发动机散热风扇减振的新途径。

Biological Vibration Damping Strategies and Mechanisms

Excessive vibration in civil and mechanical systems can lead to structural damage or harmful noise.Structural vibration can be mitigated by reducing the energy of the vibration source or by isolating the external disturbance from the target structure.Depending on the tunability and power consumption of the system,existing vibration control strategies are divided into active,passive and semi-active types,providing a more stable and efficient solution for vibration control.However,conventional damping structures have difficulty in meeting the requirements of wide frequency range and high precision damping under complex operating conditions.Therefore,the design of efficient damping structures is one of the key challenges in the development of vibration control technology.Organisms have evolved over millions of years to effectively damp vibrations through special structures and composite materials to ensure their survival.Opening up damping vibration isolation technology from a bionic perspective can meet the frequency requirements of vibration damping and guarantee higher output accuracy of machinery.This review summarizes the basic principles of vibration control and analyses the vibration control strategies for different damping materials and damping structures.Meanwhile,various models of bio-damped structures are outlined.Moreover,the current status and recent progress of research on bionic damped structures based on bio-vibration control strategies are discussed.Finally,new perspectives on future developments in the field of bionic damped vibration control techniques are also presented.A comprehensive understanding of existing vibration damping mechanisms and new methods of bionic damping design will certainly trigger important applications of precision vibration control in the fields of aerospace,rail transportation and mechanical systems.

基于动态结构的仿生设计新进展

从静态到动态,从宏观到微观,动态结构的仿生不断从生物界获得灵感。重点介绍生物体动态结构的仿生在仿生推进、仿生减阻、仿生减振和仿生系统四方面的新进展,指出动态结构仿生的发展趋势,强调多学科协作和仿生理论研究的重要性。

基于仿生多孔阻尼结构的矿用轴流式风机叶片抑颤研究

随着矿用轴流式风机长叶片使用日趋广泛,对其减振性能的要求也日益提高。模拟竹壁微观结构,提出了一种多孔阻尼结构,并建立了其数学模型。利用ABAQUS软件对某带有多孔阻尼结构的矿用轴流式风机叶片的阻尼性能进行了研究。结果表明,叶片的减振性能显著提高。可为高效阻尼结构设计及矿用轴流式风机叶片抑颤研究提供参考。