An analytic model of the in-line and cross-axis apparent mass of the seated human body exposed to vertical vibration with and without a backrest

2011 ◽  
Vol 330 (26) ◽  
pp. 6509-6525 ◽  
Author(s):  
Guangtai Zheng ◽  
Yi Qiu ◽  
Michael J Griffin
Keyword(s):  
Human Body ◽  
Vertical Vibration ◽  
Analytic Model ◽  
Apparent Mass ◽  
Cross Axis

The apparent mass of the seated human body: Vertical vibration

1989 ◽  
Vol 22 (2) ◽  
pp. 81-94 ◽  
Author(s):  
Thomas E. Fairley ◽  
Michael J. Griffin
Keyword(s):  
Human Body ◽  
Vertical Vibration ◽  
Apparent Mass

Apparent mass of the seated human body during vertical vibration in the frequency range 2–100 Hz

Ergonomics ◽  
2020 ◽  
Vol 63 (9) ◽  
pp. 1150-1163
Author(s):  
Yu Huang ◽  
Penglin Zhang ◽  
Shihao Liang
Keyword(s):  
Human Body ◽  
Vertical Vibration ◽  
Apparent Mass ◽  
Frequency Range

Design of a Generic Zero Stiffness Compliant Joint

2010 ◽  
Author(s):  
Femke M. Morsch ◽  
Just L. Herder
Keyword(s):  
Compliant Mechanisms ◽  
Compliant Mechanism ◽  
Great Promise ◽  
Optimized Design ◽  
Analytic Model ◽  
Total Potential ◽  
Fea Model ◽  
Compliant Joint ◽  
Joint Element ◽  
Cross Axis

The objective of this paper is to design a generic zero stiffness compliant joint. This compliant joint could be used as a generic construction element in a compliant mechanism. To avoid the spring-back behavior of conventional compliant joints, the principle of static balancing is applied, implying that for each position of the joint the total potential energy should be constant. To this end, a conventional balanced mechanism, consisting of two pivoted bodies which are balanced with two zero-free-length springs, is taken as an initial concept. The joint is replaced by a compliant cross-axis flexural pivot and each spring is replaced by a pair of compliant leaf springs. For both parts an analytic model was implemented and a configuration with the lowest energy fluctuation was found through optimization. A FEA model was used to verify the analytic model of the optimized design. A prototype was manufactured and tested. Both the FEA model and the experiment confirm the reduction of the needed moment to rotate the compliant joint. The experiment shows the balanced compliant joint is not completely balanced but the moment required to rotate the joint is reduced by 70%. Thus, a statically balanced compliant generic joint element was designed which bears great promise in designing statically balanced compliant mechanisms and making this accessible to any designer.

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