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    ARE HEAVIER CARS SAFER? 1)
    ZHOU Qing
    Mechanics in Engineering    2020, 42 (6): 825-827.   DOI: 10.6052/1000-0879-20-005
    Abstract28)   HTML3)    PDF(pc) (4174KB)(29)       Save

    In vehicle collision accidents, the influence of the vehicle mass on the human body injuries depends on the accident conditions. Many severe accidents involve only one car, and the car's kinetic energy is the only "power" for producing injuries. From a viewpoint of the injury prevention for the entire road traffic, the lightweight of the vehicle has more positive effect than the harmful one.

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    THE NORTH WIND SCRAPES THE GROUND, THE FLEABANE DESTROYED——TALKING ABOUT TURBULENT BOUNDARY LAYER AND VORTEX STRUCTURES IN IT
    YANG Shaoqiong, JIANG Nan
    Mechanics in Engineering    2020, 42 (6): 818-824.   DOI: 10.6052/1000-0879-20-041
    Abstract29)   HTML0)    PDF(pc) (27762KB)(36)       Save

    Through appreciating of the description of the north wind and the snow in "A Song of White Snow on Secretary Wu's Return to Capital" and "A Song of Running-horse River in Farewell to General Feng of the Western Expedition" by the famous frontier fortress poet, Cen Shen, in Tang Dynasty, the reason why "The north wind scrapes the ground, the fleabane destroyed" is explained from the view of fluid mechanics. The forefront of the fundamental research of the turbulence, and the complex vortex structures in the turbulent boundary layer are introduced in the meantime.

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    MECHANICAL ANALYSIS OF A SPIDERMAN TOY
    ZHENG Zijun, TAO Yumei
    Mechanics in Engineering    2020, 42 (6): 828-830.   DOI: 10.6052/1000-0879-19-444
    Abstract49)      PDF(pc) (2213KB)(44)       Save
    The spider man toy can continually flip on a vertical glass wall, its mechanism is studied in this paper. With a model consisting of viscoelastic and negative stiffness elements, the time-delayed debonding phenomenon of the rubber-glass interface is explained. Due to the phenomenon, in each flipping cycle, the upper extremities of the toy fall off while the lower ones still stick to the wall; then the system rotates about the latter, until the former finally collide into the wall and adhere to it again. During this process, the gravity potential energy first turns into the kinetic energy of the fixed-axis rotation, then further converts to the deformation energy of the rubber extremities through the collision, and is finally consumed by the damping.
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    BEWARE OF THE BEACH HIDDEN KILLER--RIP CURRENT
    TIAN Haiping, YI Xingrui, WANG Wei
    Mechanics in Engineering    2020, 42 (3): 381-387.   DOI: 10.6052/1000-0879-19-413
    Abstract303)   HTML32)    PDF(pc) (6947KB)(181)       Save

    The rip current is a strong current, perpendicular to the coastline and towards the open seas. It is very dangerous for people at the beach, and once carried away from the shoal by the rip current, inexperienced swimmers will find it difficult to swim back to the shore and will eventually be drowned due to the exhaustion. Most drowning accidents in the coastal area are associated with the rip current. The lack of public awareness about the rip current is one important cause. This paper reviews the damage, the development, the characteristics and the classification of the rip current from the perspective of hydrodynamics, and some suggestions are made of how to prevent the rip current and ensure the safety.

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    A RAINBOW SPRING WALKING ON A RUN-MACHINE
    LIU Yanzhu
    Mechanics in Engineering    2020, 42 (3): 378-380.   DOI: 10.6052/1000-0879-19-395
    Abstract114)   HTML2)    PDF(pc) (769KB)(95)       Save

    This paper gives the dynamical explanation of a rainbow spring walking on a run-machine.

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    REVISIT OF SELF-STABILIZATION OF UNMANNED BICYCLE
    LIU Yanzhu
    Mechanics in Engineering    2020, 42 (1): 116-118.   DOI: 10.6052/1000-0879-19-027
    Abstract166)   HTML11)    PDF(pc) (643KB)(211)       Save

    The realization of an unmanned self-stabilizing bicycle is discussed. A stability analysis is made for a mathematical model of a bicycle controlled by the rotation of the front set. It is shown that the self- running bicycle can be asymptotically stabilized only when the damping factor in the rotation axis of the front set is considered, and the input signals of the control system should contain the angular velocity of the side-leaning of the bicycle.

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    Mechanics in Engineering    2018, 40 (4): 469-476.   DOI: 10.6052/1000-0879-18-087
    Abstract269)      PDF(pc) (17003KB)(332)       Save
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    Mechanics in Engineering    2018, 40 (2): 236-238.  
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    Mechanics in Engineering    2018, 40 (2): 239-243.   DOI: 10.6052/1000-0879-17-042
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    Mechanics in Engineering    2018, 40 (1): 106-107.  
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    Mechanics in Engineering    2018, 40 (1): 108-111.   DOI: 10.6052/1000-0879-17-155
    Abstract401)   HTML2)    PDF(pc) (638KB)(964)       Save
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    Mechanics in Engineering    2018, 40 (1): 111-115.   DOI: 10.6052/1000-0879-17-033
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       2014, 36 (4): 517-519.   DOI: 10.6052/1000-0879-13-380
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       2014, 36 (4): 524-526.   DOI: 10.6052/1000-0879-13-448
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    TWO CORE ISSUES OF BIOMECHANICS 1)
    QIAO Aike
    Mechanics in Engineering    2020, 42 (1): 119-123.   DOI: 10.6052/1000-0879-19-324
    Abstract218)      PDF(pc) (684KB)(163)       Save
    The biomechanics is the science of applying the mechanical principles and methods to quantitatively study mechanical problems in organisms. This paper points out that the constitutive relationship and the stress-growth relationship are the two core issues in the biomechanics. The meaning of the constitutive relationship can be explained by using three examples: the "blood is thicker than water", the "artery hardening" and the "bone under loading"; and the meaning of the stress-growth relationship can be explained by using other three examples: the "bone growth", the "hard Qigong" and the "hypertension and cardiovascular diseases".
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