Results 251 to 260 of about 391,234 (275)

Stiffness Measurement of Micro-Cantilever Based on Negative Electrostatic Stiffness

Nanoscience and Nanotechnology Letters, 2020
Micro-cantilever is basic structure of Micro-Electro-Mechanical-Systems (MEMS) sensor, and mechanical stiffness is the most important parameter of micro-cantilever. The mechanical stiffness can be affected by shape, size and material, and it should be experimentally measured for fabrication variation.
Xianshan Dong, Qinwen Huang, Yun Huang, Wei Su, Ping Lai   +4 more
openaire   +1 more source

Programmable Buckling-based negative stiffness metamaterial

Materials Letters, 2020
Abstract Programmable mechanical metamaterials, whose properties would vary once their service environment changed, have a great prospect in many application scenarios. In this paper, a novel buckling-based negative stiffness (NS) mechanical metamaterial, consisting of pre-compressed elastic curved beams, is proposed, and its mechanical properties ...
Xiaojun Tan, Bing Wang, Yongtao Yao, Kaili Yao, Yuying Kang, Shaowei Zhu, Shuai Chen, Peifei Xu   +7 more
openaire   +1 more source

Modified Adaptive Negative Stiffness Device with Variable Negative Stiffness and Geometrically Nonlinear Damping for Seismic Protection of Structures

International Journal of Structural Stability and Dynamics, 2021
Adaptive negative stiffness device is one of the promising seismic protection devices since it can generate seismic isolation effect through negative stiffness when it is mostly needed and achieve similar vibration mitigation as a semi-active control device. However, the adaptive negative stiffness device generally combined with linear viscous damping
Li, Huan, Li, Jianchun, Yu, Yang (R20094), Li, Yancheng   +3 more
openaire   +3 more sources

Negative stiffness metamaterials and periodic composites

The Journal of the Acoustical Society of America, 2012
The creation of negative stiffness (NS) metamaterials is of interest for damping treatments, vibration isolation, and even more exotic applications such as acoustic lenses displaying negative refraction. This work will present ongoing efforts to produce NS metamaterial elements that rely on a bistable microscale geometry that leads to NS under ...
Michael R. Haberman, Timothy D. Klatt, Preston S. Wilson, Carolyn Seepersad   +3 more
openaire   +1 more source

Novel multidirectional negative stiffness mechanical metamaterials

Smart Materials and Structures, 2019
This paper presents a novel tri-directional negative stiffness (NS) mechanical metamaterial, consisting of disk structure elements arranged in three-dimensions. The NS behavior was achieved through the elastic instability of the disk structure. Through the combination of numerical simulations and experiments, the NS property, the deformation mechanisms,
Xiaojun Tan, Bing Wang, Shaowei Zhu, Shuai Chen, Kaili Yao, Peifei Xu, Linzhi Wu, Yuguo Sun   +7 more
openaire   +1 more source

Efficiently tunable positive-negative stiffness actuator

2017 IEEE International Conference on Robotics and Automation (ICRA), 2017
Compliant actuators have found their place in areas of prosthetics, rehabilitation and robot locomotion because they enable safe human-robot and stable robot-environment interaction, both non-trivial to achieve using conventional rigid actuation. These actuators are capable of varying their equilibrium position and apparent output stiffness in a way ...
Abhinav Dahiya, David J. Braun
openaire   +1 more source

Real-time tunable negative stiffness mechanical metamaterial

Extreme Mechanics Letters, 2020
Abstract Real-time tunable mechanical metamaterial is an emerging field attracting great attention. It enables a wide range of mechanical properties but is hard to design and fabricate due to its complexity. Here, a pneumatically actuated tunable negative stiffness mechanical metamaterial with real-time tunable properties is presented.
Xiaojun Tan, Shuai Chen, Bing Wang, Jie Tang, Lianchao Wang, Shaowei Zhu, Kaili Yao, Peifei Xu   +7 more
openaire   +1 more source

Membrane acoustic metamaterial absorbers with magnetic negative stiffness

The Journal of the Acoustical Society of America, 2017
A membrane absorber usually requires a large back cavity to achieve low-frequency sound absorption. This paper describes the design of a membrane acoustic metamaterial absorber in which magnetic negative stiffness is employed to reduce the size of the back cavity.
Junjuan, Zhao, Xianhui, Li, Yueyue, Wang, Wenjiang, Wang, Bin, Zhang, Xiaoling, Gai   +5 more
openaire   +2 more sources

Hierarchical negative stiffness mechanical metamaterials

Smart Materials and Structures
Abstract Negative stiffness mechanical metamaterials (NSMMs) have enormous application potential in fields such as energy absorption due to their unique mechanical properties. Currently, a large number of NSMMs with novel configurations have been proposed, greatly enriching the concept of such structural materials.
Qibo Qin, Xin Liu, Jianhao Man, Bo Cao, Bing Wang, Xiaojun Tan   +5 more
openaire   +1 more source

Chains of oscillators with negative stiffness elements

Journal of Sound and Vibration, 2014
Negative stiffness is not allowed by thermodynamics and hence materials and systems whose global behaviour exhibits negative stiffness are unstable. However the stability is possible when these materials/systems are elements of a larger system sufficiently stiff to stabilise the negative stiffness elements.
Elena Pasternak, Arcady V. Dyskin, Greg Sevel   +2 more
openaire   +1 more source