scholarly journals OPTIMAL DESIGN PARAMETER FOR NEGATIVE STIFFNESS CONTROL BASED ON SKYHOOK CONTROL ANALOGY

2009 ◽  
Vol 65 (3) ◽  
pp. 814-824 ◽  
Author(s):  
Akira IGARASHI ◽  
Masaki HIGUCHI ◽  
Hirokazu IEMURA
Keyword(s):  
Optimal Design ◽  
Design Parameter ◽  
Negative Stiffness ◽  
Stiffness Control

Optimal design of a cellular material encompassing negative stiffness elements for unique combinations of stiffness and elastic hysteresis

2017 ◽  
Vol 135 ◽  
pp. 37-50 ◽  
Author(s):  
Anna Guell Izard ◽  
Ricardo Fabian Alfonso ◽  
Geoffrey McKnight ◽  
Lorenzo Valdevit
Keyword(s):  
Optimal Design ◽  
Cellular Material ◽  
Negative Stiffness ◽  
Elastic Hysteresis

scholarly journals Optimization of Design Parameters of Spiral Spring for Active Headrest Deployment

2018 ◽  
Vol 167 ◽  
pp. 02017
Author(s):  
Yunsik Yang ◽  
Euy Sik Jeon ◽  
Dae Ho Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Optimal Design ◽  
Relative Motion ◽  
Design Parameter ◽  
Development Time ◽  
Design Parameters ◽  
Element Analysis ◽  
Spiral Spring ◽  
The Finite Element Analysis

Several studies have been conducted to prevent neck injury in rear-end collision. The headrest of the seat which suppresses the relative motion of the head and the torso can suppress the extension of the head, thereby alleviating the injury. The active headrest has a mechanism that supports the head by deploying the headrest at the rear-end collision. The spring remains compressed or twisted until a collision signal is generated and the headrest is deployed after the collision signal. Depending on the shape and deployment structure of the spring, a spring design with a high resilience that is acceptable to the headrest is required. In this paper, design parameter of spiral spring suitable for the structure of the developed headrest is selected, prototypes are fabricated, and development parameters such as development time and development distance are checked and optimal design parameters of the spiral spring are derived. The feasibility of the headrest with the designed spiral spring was verified by the finite element analysis.

Derivatives of Eigenvalues for Torsional Vibration of Geared Shaft Systems

1993 ◽  
Vol 115 (3) ◽  
pp. 277-279 ◽  
Author(s):  
Liu Zhong-Sheng ◽  
Chen Su-Huan ◽  
Xu Tao
Keyword(s):  
Sensitivity Analysis ◽  
Optimal Design ◽  
Natural Frequency ◽  
Torsional Vibration ◽  
Design Parameter ◽  
Practical Importance ◽  
Design Sensitivity ◽  
Shaft System ◽  
Eigenvalue Derivatives ◽  
Derivatives Of

Design sensitivity analysis of natural frequency for geared shaft systems is of practical importance in the optimal design of these systems. This note provides a simple and easily implemented method to calculate the eigenvalue derivatives of a geared shaft system with respect to a design parameter ν, including gear inertia J, shaft stiffness K, and transmission ratio Q, when the eigensolution is known. An example is given to illustrate the method.

Single input magnetorheological pseudo negative stiffness control for bridge stay cables

2020 ◽  
Vol 30 (1) ◽  
pp. 015032
Author(s):  
Yan-Wei Xu ◽  
Zhao-Dong Xu ◽  
Ying-Qing Guo ◽  
Xing-Huai Huang ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Negative Stiffness ◽  
Stay Cables ◽  
Single Input ◽  
Stiffness Control

Optimal Design of Cathode’ Working Tooth in ECM for Rifle Based Visual C++

2011 ◽  
Vol 189-193 ◽  
pp. 4396-4399
Author(s):  
Jian Li Jia ◽  
Wen Tao Zhao
Keyword(s):  
Optimal Design ◽  
Design Parameter ◽  
Electrochemical Machining ◽  
Long Period ◽  
Spiral Angle

To design an electrochemical machining (ECM) cathode for machining the mixed rifle with large spiral angle and the experiments are difficult, it takes a long period. Visual C++ was adopted to simulate the process for machining rifle as cathode moves according to the Ballistic equation. The models of 3D working tooth on cathode and the processing environment were built and the arithmetic was established. The length of working tooth was initialized. Having compared above points with design parameter, the parameter of cathode’ working tooth will be modified till it be close to design parameter. At last the result for appropriate parameter of cathode’ working tooth was proposed.

scholarly journals Linear optimal design of a magnetic repulsion negative stiffness structure

2021 ◽  
pp. 146134842199261
Author(s):  
Zhang Bao ◽  
Wang Xiaoping ◽  
Ge Xinfang
Keyword(s):  
Optimal Design ◽  
Structural Design ◽  
Simulation Analysis ◽  
Structural Parameters ◽  
Negative Stiffness ◽  
Design Parameters ◽  
Structural Parameter ◽  
Design Requirements

To reduce negative stiffness structure’s stiffness non-linearity, enhance its stability during entire working displacement range, and expand its allowable working displacement, the optimal design of negative stiffness structure based on magnetic repulsion is proposed, and its structural parameters are also provided. The new negative stiffness structure’s model is established to determine the structural design parameters. According to the change of the new negative stiffness structure’s stiffness curve, we select the structural parameter to meet the design requirements. In order to verify the effectiveness of the proposed negative stiffness structure, we carried out simulation analysis, and the results show that the optimized negative stiffness structure’s stiffness non-linearity is greatly reduced in a relatively longer displacement, and its stiffness stability is promoted substantially compared with the simple triple-magnet negative stiffness structure.

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