A simple method to design and analyze dynamic vibration absorber using dimensional analysis

Karimi, Mohammad; Shemshadi, Mehrdad; Firoozfam, Naghmeh

doi:10.1177/1077546320923928

Cited by 8 publications

(4 citation statements)

References 20 publications

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“…Penggabungan ini dilakukan dengan pengelasan. Studi tentang pengelasan pada dissimilar metal sangat penting dilakukan, hal ini dikarenakan penerapannya pada bidang industri semakin banyak [10] [11] [12] [13]. Pengelasan dissimilar metal perlu memperhatikan beberapa hal, diantaranya pemilihan logam, metode pengelasan dan material pengisi [14] [15].…”

Section: Pendahuluanunclassified

Pengaruh Variasi Travel Speed Terhadap Kekuatan Tarik Pada Pengelasan Disimilar Metal Dengan Mig Robotic Welding

Witono,

Machfuroh,

Sarjiyana

et al. 2023

Otopro

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Welding using dissimilar metals is a new phenomenon in the industrial world. Some studies have already addressed dissimilar metal welding, but they are limited to variations in welding current strength and voltage. None have yet explored welding travel speed, mainly due to the difficulty in controlling it in manual welding. Because of this background, the researcher conducted a study on welding by varying the travel speed. The aim of this research is to elucidate the influence of travel speed on tensile strength in dissimilar metal welding using MIG robotic welding. The study involved joining dissimilar metals, namely low carbon steel and stainless steel (SS 304), using the MIG Robotic Welding process with travel speed variations of 50 cm/second, 60 cm/second, and 70 cm/second. The welding results were then subjected to tensile testing and macrostructure observation of the fracture surfaces. The research findings indicate that the highest tensile strength was achieved at a travel speed of 50 cm/minute, with a maximum tensile strength of 839.8879 MPa.

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Section: Pendahuluanunclassified

Pengaruh Variasi Travel Speed Terhadap Kekuatan Tarik Pada Pengelasan Disimilar Metal Dengan Mig Robotic Welding

Witono,

Machfuroh,

Sarjiyana

et al. 2023

Otopro

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“…For convenience, the following six dimensionless parameters are defined:in which ω 0 is defined as k1/m1. This is the smallest number of dimensionless parameters, as can be shown by using the Buckingham Π theorem (Deb and Deb, 1986; Karimi et al, 2021), since the total number of relevant variables in equation (16) is 8 and the rank of the dimensional matrix is 2. The same is valid for the deformation of the upper substructure, because both FRFs depend on the same seven relevant independent variables, only H 1 should be substituted by H 12 in equation (20) to study such a response.…”

Section: Analytical Approachesmentioning

confidence: 99%

On the vibration control through mode coupling in a near-uniform chain-like structure using an inerter

Garrido

Domizio

Curadelli

2023

Journal of Vibration and Control

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The tuned mass damper (TMD) is a classical device interesting for reducing deformations between DOFs without physically connecting them. However, it has a practical limit due to the increase in mass required for improving its performance. A building mass damper (BMD) uses mode coupling to make the upper substructure of a chain-like structure behave as a TMD for the lower substructure, which avoids adding mass to the structure. Unfortunately, near-uniform chain-like structures require isolation of the upper substructure for tuning the BMD, making it impractical for retrofitting existing structures since it is an in-series intervention. This paper proposes and evaluates using an inerter, instead of isolating the upper substructure, to control vibrations through mode coupling in a chain-like structure. From an analytical and numerical study, it was found a significant reduction of lower substructure deformations by implementing solely an inerter and a damper in the upper substructure. The inerter-based approach showed similar performance to the classical BMD with the advantage of being an in-parallel intervention. Therefore, this approach constitutes a practical retrofit to improve the dynamic behavior of existing structures with excessive deformations in a lower substructure whose functionality or esthetics would be compromised if control devices were installed in it.

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“…A major difficulty in CPVA design is determining the maximum amplitude of motion of the absorber and avoiding the impact of nonlinear characteristics when the amplitude is too large (Sharif-Bakhtiar and Shaw, 1988; Issa and Shaw, 2015; Karimi et al, 2021). Sharif-Bakhtiar and Shaw (1988) found that a motion-limiting device can be used effectively when the amplitude exceeds the steady-state response.…”

Section: Introductionmentioning

confidence: 99%

Dynamic response control of centrifugal pendulum vibration absorber with motion-limiting device during startup in gravity field

Zhang

Long

2022

Journal of Vibration and Control

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The dynamic performance of a vertically rotating centrifugal pendulum vibration absorber (CPVA) during engine start-up was investigated. The equations of motion were established using a Lagrange equation of the second kind containing terms for gravity and the motion-limiting device of the absorber, respectively. The optimal positioning of the motion-limiting device was determined from the perspective of CPVA stability and damping capability, and the terminology for the CPVA damping quality factor was defined to evaluate the damping capability of the absorber. Simulink models were established to simulate the behaviour of the absorbers at different speeds during engine initiation and assess the impact between the absorber and motion-limiting device during engine start. Based on the results, the concept of knocking power was proposed, and it was shown that resonance occurring during engine start worsens the noise, vibration and harshness (NVH) performance of the system. It was further shown that the initial position of the absorber at the moment of engine start to turn affects the knocking power and, as a result, the startup noise of the CPVA. The study also finds that the transient position of the absorber at the engine ignition time affects the knocking power. The responses of CPVA under different working conditions were tested on an electric bench and compared with simulation results. Based on our results, we propose several measures to control absorber behaviour and reduce knocking power.

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A simple method to design and analyze dynamic vibration absorber using dimensional analysis

Cited by 8 publications

References 20 publications

Pengaruh Variasi Travel Speed Terhadap Kekuatan Tarik Pada Pengelasan Disimilar Metal Dengan Mig Robotic Welding

Pengaruh Variasi Travel Speed Terhadap Kekuatan Tarik Pada Pengelasan Disimilar Metal Dengan Mig Robotic Welding

On the vibration control through mode coupling in a near-uniform chain-like structure using an inerter

Dynamic response control of centrifugal pendulum vibration absorber with motion-limiting device during startup in gravity field

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