A concept of smart multiaxial impact damper made of vacuum packed particles

Abstract

The conceptual design of smart crash energy absorber made of Vacuum Packed Particles (VPP) is presented in this work. This structure is composed of granular material inside a plastomer sleeve. The absorber can change the flexural stiffness and as a result the amount of dissipated energy depending on the impact conditions. The special properties of the granular structure create the possibility of various applications as different working modes can be used. When the pressure inside is equal or higher than atmospheric pressure the system behaves similarly to a liquid, otherwise it has properties similar to viscoplastic solid. The physical properties of the structure may be rapidly changed by adjusting the pressure inside the system. Due to these properties Vacuum Packed Particles is considered to be a smart material.

Identification-based predictive control of semi-active shock-absorbers for adaptive dynamic excitation mitigation

“…The above problem is often solved using the so-called inverse dynamics approach, which assumes ideal tracking of the feasible path and enables computation of valve opening using the system of governing equations (Eqs. [11][12][13][14][15][16][17][18][19][20] supplemented with the additional condition F abs A v ð Þ ¼ F feas abs . The solution of the path-tracking problem can be defined: i) in terms of displacement of the piston A v u ð Þ-semi-passive or semi-active control system [39], ii) directly in terms of time…”

“…Large variety of shockabsorbers' applications leads to numerous technical solutions, which differ from each other in terms of construction, involved physical phenomena and complexity of control system. At present, more and more frequent practice is the use of so-called smart devices, which are based on functional materials and advanced control systems, e.g., magneto-rheological energy absorbers [12][13][14][15], electro-rheological dampers [16,17], particle impact dampers [18,19], or pneumatic adaptive absorbers with piezoelectric valves [20]. Simultaneously, advances in the development of…”

Innovative Controllable Torsional Damper Based on Vacuum Packed Particles

“…Similar to other smart materials, MREs are applied to various types of structures. It is possible to find MRFs and MREs as a base of linear dampers, torsional dampers, or as a core in sandwich beams [ 12 , 13 , 14 ].…”

Prototype of a controllable damper based on granular materials subjected to partial vacuum

“…Controlled damping of noise and vibration is still the object of interest for engineers and researchers. A breakthrough in this field was the end of the last century, when material engineering and information systems progressed, enabling the commercial use of materials belonging to the so-called, group of "smart structures" [1]. From that moment, the research on the possibility of eliminating vibrations harmful to the structure or its user is bi-directional.…”