Adaptive inertial shock-absorber

Faraj, Rami; Holnicki‐Szulc, Jan; Knap, L.; Seńko, Jarosław

doi:10.1088/0964-1726/25/3/035031

Cited by 28 publications

(11 citation statements)

References 12 publications

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“…Zhang et al [24] proposed the strategy of using a distributed tuned inerter system to control the seismic response in multiple modes in the high-rise chimney, which achieved the lightweight effect. Faraj et al [25] proposed a new method to adjust the inertial mass of the inerter by using impact energy management to absorb impact and store it in a special device. Javidialesaadi and Wierschem [26] proposed a new type of nonlinear energy absorber equipped with an inerter system for passive vibration control of structures.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of Damped Structure with Inerter System Based on Modified Harmony Search Algorithm

Pan

Xiao

Wang

et al. 2022

Advances in Civil Engineering

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An inerter system can amplify the deformation of its internal energy dissipation device, thereby improving the efficiency of energy dissipation and shock absorption. This is the so-called damping enhancement mechanism, one of the key mechanisms of the inerter system. Although the theoretical framework for damping enhancement of inerter systems has been established, the implementation of this principle for the design of an inerter system requires solving a complicated constrained optimization problem, which is not easy to be figured out using traditional approaches. To obtain valid design results through a lucid and robust method, it is proposed to optimize the damping parameters through a metaheuristic algorithm named harmony search algorithm in order to maximize the damping enhancement degree of the inerter system with the satisfaction of structural performance. First, the closed-form seismic response solutions of a single-degree-of-freedom (SDOF) structure with an inerter system are derived based on the theory of random vibration. Then, the mathematical expression of the constrained optimization problem is established. Due to the inefficiency of the original harmony search algorithm to solve the constrained optimization problem, the algorithm is modified by introducing a new harmony generating method and an adaptive strategy for parameter adjustment. The modified harmony search algorithm is compiled to solve the optimal design problem of the inerter system. The algorithm is verified by designing a structure with an inerter system. It is found that the number of iterations and time consumption until convergence required by the modified harmony search algorithm can be reduced by about 20%∼90% compared with the original algorithm, which confirms the effectiveness of the modified algorithm. The results of dynamic analyses show that the structure have achieved the preset performance demands under different cases and the damping enhancement characteristic of the inerter system is fully utilized.

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Section: Introductionmentioning

confidence: 99%

Optimal Design of Damped Structure with Inerter System Based on Modified Harmony Search Algorithm

Pan

Xiao

Wang

et al. 2022

Advances in Civil Engineering

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“…Since the flywheel diameter is normally restricted by the surroundings, the traditional flywheel inertia is largely controlled by and is proportional to the gravitational mass of the flywheel. At present, the research on the flywheel for an inerter is primarily focused on how to dynamically change the inertance by diversification on flywheel structures, which is helpful to control the vibration by active or semiactive method through inerter [19,[23][24][25]. However, for passive inerter with fixed inertance, there are few designs for lightening the flywheel.…”

Section: Introductionmentioning

confidence: 99%

Modeling, Testing, and Characteristic Analysis of a Planetary Flywheel Inerter

Wei-rui

2018

Shock and Vibration

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We propose the planetary flywheel inerter, which is a new type of ball screw inerter. A planetary flywheel consists of several planetary gears mounted on a flywheel bracket. When the flywheel bracket is driven by a screw and rotating, each planetary gear meshing with an outer ring gear generates a compound motion composed of revolution and rotation. Theoretical analysis shows that the output force of the planetary flywheel inerter is proportional to the relative acceleration of one terminal of the inerter to the other. Optimizing the gear ratio of the planetary gears to the ring gear allows the planetary flywheel to be lighter than its traditional counterpart, without any loss on the inertance. According to the structure of the planetary flywheel inerter, nonlinear factors of the inerter are analyzed, and a nonlinear dynamical model of the inerter is established. Then the parameters in the model are identified and the accuracy of the model is validated by experiment. Theoretical analysis and experimental data show that the dynamical characteristics of a planetary flywheel inerter and those of a traditional flywheel inerter are basically the same. It is concluded that a planetary flywheel can completely replace a traditional flywheel, making the inerter lighter.

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“…Vibro-impact system designed by Faraj et al. 38 transforms rectilinear vibrations into rotary inertia. Multibody simulation has been performed to evaluate effect of mass and damping factor on the motion conversion efficiency.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of switchable magnetic polarity bistable energy harvester

Satpute¹,

Jugulkar

Satpute³

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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Multistable vibration harvesters that involve repelling magnet force result in improved efficiency over a wider bandwidth in comparison to the conventional resonant devices. However, the dynamic performance of the vibration harvester can be further improved by switching the magnetic force polarity to ensure pull force on the mass as it moves towards the mean position. In the presented work, the design and analysis of a switching polarity bistable harvester has been presented, which changes the magnetic interaction polarity in order to improve power output as well as efficient operational bandwidth. An innovative mechanism has been developed to operate the harvester with switching polarity for higher base acceleration amplitude. The proposed design has integrated switchable polarity magnetic interaction and rotary electric generator which is driven by a compound gear train in the conventional spring-mass harvester. Analytical and numerical simulations have been formulated to illustrate efficient operational characteristics over the operating frequency band and to determine the optimum electrical damping coefficient. Effects of magnetic interaction force, the inertia of the switching mechanism and gears have been considered in the numerical analysis. A prototype delivered the peak power of 1.49 W at the resonance frequency and exhibited 50% increase in power in comparison to fixed polarity design.

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Adaptive inertial shock-absorber

Cited by 28 publications

References 12 publications

Optimal Design of Damped Structure with Inerter System Based on Modified Harmony Search Algorithm

Optimal Design of Damped Structure with Inerter System Based on Modified Harmony Search Algorithm

Modeling, Testing, and Characteristic Analysis of a Planetary Flywheel Inerter

Design and analysis of switchable magnetic polarity bistable energy harvester

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