Developments of Tuned Mass Damper for yacht structures

Pais, Tatiana; Boote, Dario

doi:10.1016/j.oceaneng.2017.06.046

Cited by 14 publications

(5 citation statements)

References 4 publications

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“…Second, when the response is large such that x c > x o , the system operates under the influence of the restoring force given in Eq. (2). In this case, the response follows the solid curve, i.e.…”

Section: Frequency Response Curvementioning

confidence: 92%

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Experimental characterization and performance of dynamic vibration absorber with tunable piecewise-linear stiffness

Mustaffer

Ramlan

Rahman

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Dynamic vibration absorber (DVA) is one of the ways to control the level of vibration. Among many mechanisms and control strategies of the DVA, passively tuned DVA emerges as one of the most effective absorbers due to its simple mechanism. However, the performance of the passive tuned DVA suffers from narrow suppression bandwidth. This paper introduces a nonlinear dynamic vibration absorber (NDVA) with an adjustable piecewise-linear stiffness mechanism which has a characteristic almost similar to hardening stiffness to broaden the vibration suppression bandwidth. The mechanism is made of a cantilever beam constrained by two vertically and horizontally adjustable limit blocks on either side of the beam's equilibrium position. The static and dynamic properties of the proposed NDVA were first investigated for different positions of the limit blocks. Then the performance of the NDVA was compared with the linear DVA in terms of the vibration suppression bandwidth, separation of resonance frequencies and the ability to cope with mistuning. Overall, the NDVA seems to outperform the linear DVA, and it is more forgiving in the case of mistuning.

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Section: Frequency Response Curvementioning

confidence: 92%

“…Dynamic vibration absorber (DVA) is one of the vibration control methods in reducing vibration problems [1][2][3]. The DVA was first introduced by Frahm [4], which is also called tuned vibration absorber (TVA).…”

Section: Introductionmentioning

confidence: 99%

Experimental characterization and performance of dynamic vibration absorber with tunable piecewise-linear stiffness

Mustaffer

Ramlan

Rahman

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…Table 1 presents the summary of the inter-subjective variabilities previously described. One key aspect to note is that the BM model from [19,30] specifies proper equations for the values of L s , α 1 , and α 2 , as per Equations ( 11)- (13). In the simulations, considering the inter-subject variability of this BM (further presented in Section 5.3.5, denoted as BM2), these parameters are not sampled from the probabilistic density functions presented in Table 1, but instead Equations ( 11)-(13) are used.…”

Section: Inter-subject Variabilitymentioning

confidence: 99%

“…The TMD is limited to controlling the excitation of one chosen frequency and others close to it, and is sensitive to any structural modifications over the time which can considerably compromise its efficiency. Despite this, some examples of the successful application of TMD control systems include tall buildings [7,8], bridges [9,10], and towers [11] under wind load effects, factories floors [12] effected by machinery vibration, floating vessels [13] subjected to wave loads, and especially floors [14,15] and footbridges [3,16] under the action of pedestrian loading.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of TMD Performance in Footbridges Using Human Walking Probabilistic Models

et al. 2021

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Footbridges are generally slender and lightweight structures with low stiffness, designed to support dynamic loads generated by crowds. Therefore, these structures are exposed to vibration problems related to the resonance of human walking step frequencies and the lower vibration modes. To mitigate these problems, one of the most applied corrective strategies is the installation of tuned mass damper (TMD) systems that aim at the vibration reduction of the footbridge’s dominant mode. A fundamental matter in both the footbridge and the TMD design is the pedestrian load modelling, generally considered as a deterministically moving force or a biodynamic model. However, as human gait is a random process, the deterministic models can lead to non-realistic results, directly affecting the TMD system efficiency. In contrast, the use of probabilistic distributions to simulate the human walk randomness can lead to more reliable time series predictions. In this paper, a random walk (RW) algorithm is developed and applied to simulate different crowd scenarios using a simplified plane model of a coupled human-structure-TMD system. In each scenario, the TMD efficiency in reducing the vibration amplitudes is assessed. Results highlight the importance of considering the walking randomness and pedestrians’ dynamic properties in the TMD design.

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“…Passively tune the DVA and manually adjust the natural frequency of the DVA to match the modal frequency of the main structure. In order to obtain the required natural frequency, the stiffness is usually changed instead of the mass [16][17][18][19][20].…”

Section: Optimization Schemementioning

confidence: 99%

Analysis and Optimization of Low‐Speed Road Noise in Electric Vehicles

2021

Wireless Communications and Mobile Computing

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When a certain electric vehicle is driving at a constant speed of 40 km/h on the rough asphalt road, the rear passenger can obviously feel the ear pressure, which seriously affects the comfort. Through the analysis of objective data, it was found that the problem was caused by the road excitation, which leads to the coupling between the mode of the backup door and the mode of the acoustic cavity, and causes the resonance of the car cavity, thus causing the ear pressure sensation. To solve this problem, this paper optimizes the backup door by means of experiment and simulation, increases the dynamic vibration absorber, makes its modal frequency avoid the acoustic cavity modal frequency, and achieves the purpose of reducing the interior noise. After optimization, the vehicle noise is reduced by 8 dBA at 42 Hz under 40 km/h working condition of rough road surface, and the ear pressure sensation is reduced at the same time, thus improving the NVH (noise, vibration, and harshness) performance of the vehicle.

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Developments of Tuned Mass Damper for yacht structures

Cited by 14 publications

References 4 publications

Experimental characterization and performance of dynamic vibration absorber with tunable piecewise-linear stiffness

Experimental characterization and performance of dynamic vibration absorber with tunable piecewise-linear stiffness

Evaluation of TMD Performance in Footbridges Using Human Walking Probabilistic Models

Analysis and Optimization of Low‐Speed Road Noise in Electric Vehicles

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