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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
Abstract21)   HTML1)    PDF(pc) (769KB)(14)       Save
This paper gives the dynamical explanation of a rainbow spring walking on a run-machine.
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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
Abstract111)   HTML16)    PDF(pc) (6947KB)(69)       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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Mechanics in Engineering    2018, 40 (4): 469-476.   DOI: 10.6052/1000-0879-18-087
Abstract220)      PDF(pc) (17003KB)(322)       Save
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Mechanics in Engineering    2018, 40 (2): 236-238.  
Abstract162)   HTML0)    PDF(pc) (779KB)(584)       Save
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Mechanics in Engineering    2018, 40 (2): 239-243.   DOI: 10.6052/1000-0879-17-042
Abstract200)   HTML0)    PDF(pc) (5616KB)(509)       Save
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Mechanics in Engineering    2018, 40 (1): 106-107.  
Abstract252)   HTML4)    PDF(pc) (4265KB)(666)       Save
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Mechanics in Engineering    2018, 40 (1): 108-111.   DOI: 10.6052/1000-0879-17-155
Abstract320)   HTML0)    PDF(pc) (638KB)(821)       Save
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Mechanics in Engineering    2018, 40 (1): 111-115.   DOI: 10.6052/1000-0879-17-033
Abstract171)   HTML0)    PDF(pc) (7691KB)(556)       Save
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null    2014, 36 (4): 517-519.   DOI: 10.6052/1000-0879-13-380
Abstract494)      PDF(pc) (3441KB)(1517)       Save
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null    2014, 36 (4): 524-526.   DOI: 10.6052/1000-0879-13-448
Abstract390)      PDF(pc) (2165KB)(1178)       Save
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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
Abstract86)   HTML4)    PDF(pc) (643KB)(148)       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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TWO CORE ISSUES OF BIOMECHANICS1)
QIAO Aike
Mechanics in Engineering    2020, 42 (1): 119-123.   DOI: 10.6052/1000-0879-19-324
Abstract97)      PDF(pc) (684KB)(124)       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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