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1
Content available The optimization of the TMDI for efficient mitigation of the vibration
Mnich Konrad, Perlikowski Przemysław
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2023
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Vol. 71, nr 3
art. no. e144619
EN
The paper concerns the optimization of a tuned mass damper with inerter (TMDI) based on two strategies, i.e., the minimum amplitude in the resonance peak and minimum area under the frequency response curve. The optimization is based on real, accessible parameters. Both optimization procedures are presented in two steps. In the first one, two parameters of the TMDI are tuned (inertance and damping coefficient), while in the second one, three parameters (mass, inertance, and damping coefficient). We show that both strategies give the optimum sets of parameters and allow the reduction of the amplitude of the damped system.
2
Content available Some recent developments in inerter-based devices for vibration mitigation
Wagg David J.
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2023
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Vol. 71, nr 3
art. no. e144617
EN
Reducing the effect of unwanted vibrations is an important topic in many engineering applications. In this paper we describe some recent developments in the area of passive vibration mitigation. This is based on a new device called the inerter which can be exploited in a range of different contexts. In this paper we consider two recent examples; (i) where a flywheel inerter is combined with a hysteretic damper, and (ii) in which a pivoted bar inerter is developed for a machining application. In both cases, experimental test results show that the devices can outperform existing methods.
3
Content available Flywheel proof mass actuator for active vibration control
Kras Aleksander, Gardonio Paolo
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2023
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Vol. 71, nr 3
art. no. e144605
EN
This paper presents the experimental results of a new proof mass actuator for the implementation of velocity feedback control loops to reduce the flexural vibration of a thin plate structure. Classical proof mass actuators are formed by coil–magnet linear motors. These actuators can generate constant force at frequencies above the fundamental resonance frequency of the spring–magnet system, which can be used to efficiently implement point velocity feedback control loops. However, the dynamics of the spring–magnet system limit the stability and control performance of the loops when the actuators are exposed to shocks. The proof mass actuator investigated in this paper includes an additional flywheel element that improves the stability of the velocity feedback loop both by increasing the feedback gain margin and by reducing the fundamental resonance frequency of the actuator. This paper is focused on the stability and control performance of decentralized velocity feedback control loops.
4
Content available Impact of Using an Inerter on the Performance of Vehicle Active Suspension
Alshabatat Nabeel, Shaqarin Tamir
Advances in Science and Technology. Research Journal
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2022
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Vol. 16, no 3
331--339
EN
This paper investigates the effect of employing an inerter on the performance of active suspension systems. A quarter-car model with cubic-nonlinear spring is considered. The inerter is installed in parallel with the primary suspension spring and damper. First, feedback linearization (FBL) is used to linearize the mathematical model. Then the linear quadratic regulator (LQR) is adopted to control the suspension system. The proposed design is ride comfort-oriented and considers structural constraints. Numerical simulations are executed for passive systems with different values of inertance. Results show that employing an inerter to the passive suspension can improve the ride comfort performance by more than 32%. Employing an inerter to active suspension systems can also improve the ride comfort and reduce actuator force significantly. The actuator force can be reduced by 25%. However, the results also show that the uncaring selection of the inerter can dramatically degrade the performance of the suspension system.
5
Content available Dynamic characteristics of the structure with viscoelastic dampers combined with inerters and subjected to temperature changes
Pawlak Zdzisław M., Lewandowski Roman
Vibrations in Physical Systems
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2020
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Vol. 31, nr 2
art. no. 2020222
EN
The purpose of the work is dynamic analysis of passive dampers used in structural systems to reduce excessive vibrations caused by wind or earthquakes. Special systems are considered that contain inerter, i.e. device using rotational inertia, in combination with a viscoelastic damper. The so-called fractional models of viscoelastic dampers describe their dynamic behavior in a wide frequency range using a small number of model parameters. To describe material behavior over a wider frequency range, the time-temperature superposition principle is used. The shifting factor is calculated from the well-known William-Landel-Ferry formula. This allows for determination of damper parameters at any temperature based on the parameters obtained at the reference temperature. Laplace transformation of the derived equations of motion leads to the non-linear eigenproblem, which could be solved using the continuation method. The influence of temperature on the dynamic characteristics of the system is examined.
6
Content available Impact of coil factors on a hydraulic electric inerter based vehicle suspension
Zhang Hongdang, Shen Yujie, Yang Hongtu
Journal of Theoretical and Applied Mechanics
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2020
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Vol. 58 nr 3
711--722
EN
This paper concerns the impact of coil factors on a hydraulic electric inerter-based vehicle suspension. A hydraulic electric inerter device is first introduced, and the dynamic model of a quarter car is established. Subsequently, the influences of the coil factors on the body acceleration, suspension working space and dynamic tire load are investigated in both the time and frequency domain. Results show that the coil factors have a slight effect on the vehicle suspension performance, decreasing the root-mean-square (RMS) of the vehicle body acceleration and increasing the RMS of the suspension working space and dynamic tire load.
7
Content available Analysis of vibration transfer characteristics of vehicle suspension system employing inerter
Shen Y., Chen L., Liu Y., Zhang X.
Journal of Theoretical and Applied Mechanics
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2017
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Vol. 55 nr 4
1245--1256
EN
In this paper, the force transfer mechanism of three mechanical elements “inerter, spring and damper” is analyzed based on the “force-current” analogy theory. The vibration isolation performance of the two types of simple three-element vehicle suspensions S1 (inerter is in parallel with damper) and S2 (inerter is in series with damper) are studied. The dual-mass system model of the suspensions is built by means of using the mechanical impedance method. The influence of parameters variation on vibration transfer characteristics is also investigated.
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