Inverse structural modifications of a geared rotor-bearing system for frequency assignment using measured receptances

Tsai, Sung-Yu; Chang, Jui‐Yoa

doi:10.1016/j.ymssp.2018.03.008

Cited by 37 publications

(15 citation statements)

References 39 publications

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“…Given an higher rank modification ( ) = 2 + + , the receptance matrix of the modified system becomes [77]: Equation ( 27) reveals that the receptance of the modified system can be expressed through the receptances of the original one, ( ) = 2 + + −1 . By developing such an equation, in [78] it is demonstrated that the zeros z i of h pq after modification are the solutions of:…”

Section: Receptance-based Formulations With Higher-rank Modificationsmentioning

confidence: 99%

“…( ) is the receptance matrix of the adjunct system; although it has an "obscure physical meaning", as the Authors themselves state [78], each entry of such a matrix can be obtained from the receptances of the original system and is useful for design the system modifications. Equation ( 28) is a set of non-linear, non-separable, nonconvex, multivariate polynomials, that involves products of many design parameters.…”

Section: Receptance-based Formulations With Higher-rank Modificationsmentioning

confidence: 99%

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Beyond the Tuned Mass Damper: a Comparative Study of Passive Approaches to Vibration Absorption Through Antiresonance Assignment

Richiedei

Tamellin

Trevisani

2021

Arch Computat Methods Eng

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Vibration absorption is a core research area in the design and control of structures and machines, and exploiting antiresonances is an effective approach for systems under harmonic excitation. This paper proposes a comparative study and a review of the main passive techniques to antiresonance assignment proposed in the recent literature, by discussing them through some numerical examples too. The techniques discussed include the well-known Tuned Mass Damper, which has been widely developed in the literature. However, as the title reveals, great attention is paid to the methods inherited from the field of dynamic structural modification that assign antiresonances without modifying the number of degrees of freedom, by exploiting a proper modification of the system inertial and stiffness parameters. Due to higher mathematical complexity, these approaches have been less investigated in the literature although they are an effective and less invasive approach to antiresonance assignment, especially for machines. To puzzle out the complicated subject matter of antiresonances, their background and their key features are also discussed by reviewing the main theoretical results and their relationship with the assignment techniques. The paper is also enriched with several numerical examples to compare different methods and investigate the features of antiresonances. The concluding remarks of the paper bring together some open issues in this field of research and outlines some possible research directions.

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Section: Receptance-based Formulations With Higher-rank Modificationsmentioning

confidence: 99%

Section: Receptance-based Formulations With Higher-rank Modificationsmentioning

confidence: 99%

Beyond the Tuned Mass Damper: a Comparative Study of Passive Approaches to Vibration Absorption Through Antiresonance Assignment

Richiedei

Tamellin

Trevisani

2021

Arch Computat Methods Eng

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show abstract

“…This method can maintain certain pre-specified natural frequencies unchanged, when the mass and stiffness properties of the structure are modified. Tsai et al (2018) presented an experimental validation to an inverse frequency assignment method. A gear rotor-bearing system was tested, and several natural frequencies and nodes were assigned by adding masses.…”

Section: Introductionmentioning

confidence: 99%

Receptance-based frequency assignment for assembled structures

Zhang

Ouyang

2020

Journal of Vibration and Control

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For engineering structures, there is a strong need to assign natural frequencies to achieve desired dynamic performance. This study proposes a receptance-based frequency assignment method for assembled structures. Very often, the substructures involved are not allowed or are difficult to change. This method uses the links between the substructures as targets of structural modifications and determines the structural properties of the links that assign the desired frequencies cast as an optimisation problem. These links could be either simple discrete structural components such as masses and springs or complex continuous structures. Only a few receptances of the substructures are required in this method, which can be measured accurately and easily in practice. Two numerical examples are presented to show the validity of this method and its strength in dealing with complex assembled structures.

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“…Thus, it can be seen that vibration signals are still one of the most common indicators of the health status of rotating machinery. In general, damage faults will show obvious periodic pulse signals during the rotating process, and will clearly recognizable impact vibration can be found on the vibration signal spectrum, which is conducive to identification and effective classification [7,8]. Liu et al utilized energy entropy to detect the chatter occasions [9].…”

Section: Introductionmentioning

confidence: 99%

Weak Degradation Characteristics Analysis of UAV Motors Based on Laplacian Eigenmaps and Variational Mode Decomposition

Wang

Fan

et al. 2019

Sensors

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Brushless direct current (BLDC) motors are the source of flight power during the operation of rotary-wing unmanned aerial vehicles (UAVs), and their working state directly affects the safety of the whole system. To predict and avoid motor faults, it is necessary to accurately understand the health degradation process of the motor before any fault occurs. However, in actual working conditions, due to the aerodynamic environmental conditions of the aircraft flight, the background noise components of the vibration signals characterizing the running state of the motor are complex and severely coupled, making it difficult for the weak degradation characteristics to be clearly reflected. To address these problems, a weak degradation characteristic extraction method based on variational mode decomposition (VMD) and Laplacian Eigenmaps (LE) was proposed in this study to precisely identify the degradation information in system health data, avoid the loss of critical information and the interference of redundant information, and to optimize the description of a motor’s degradation process despite the presence of complex background noise. A validation experiment was conducted on a specific type of motor under operation with load, to obtain the degradation characteristics of multiple types of vibration signals, and to test the proposed method. The results proved that this method can improve the stability and accuracy of predicting motor health, thereby helping to predict the degradation state and to optimize the maintenance strategies.

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Inverse structural modifications of a geared rotor-bearing system for frequency assignment using measured receptances

Cited by 37 publications

References 39 publications

Beyond the Tuned Mass Damper: a Comparative Study of Passive Approaches to Vibration Absorption Through Antiresonance Assignment

Beyond the Tuned Mass Damper: a Comparative Study of Passive Approaches to Vibration Absorption Through Antiresonance Assignment

Receptance-based frequency assignment for assembled structures

Weak Degradation Characteristics Analysis of UAV Motors Based on Laplacian Eigenmaps and Variational Mode Decomposition

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