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"structural vibration"
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Sound and Structural Vibration - Radiation, Transmission and Response (2nd Edition)
The first edition of Sound and Structural Vibration was written in 1987. Since then, two major developments have taken place in the field of vibroacoustics. Powerful computational methods and procedures for the numerical analysis of structural vibration, acoustical fields and acoustical interactions between fluids and structures have been developed and these are now universally employed by researchers, consultants and industrial organizations. Advances in signal processing systems and algorithms, in transducers, and in structural materials and forms of construction, have facilitated the development of practical means of applying active and adaptive control systems to structures for the purposes of reducing or modifying structural vibration and the associated sound radiation and transmission. In this greatly expanded and extensively revised edition, the authors have retained most of the analytically based material that forms the pedagogical content of the first edition, and have expanded it to present the theoretical foundations of modern numerical analysis.
eBook
Structural time‐dependent reliability assessment of the vibration active control system with unknown‐but‐bounded uncertainties
Summary The active control system for structural vibration is extremely sensitive to the parametric uncertainty so that more and more concerns of its reliability estimation have been given recently. In view of the insufficiency of the uncertainty information in practical engineering, a non‐probabilistic time‐dependent reliability method that combines the active vibration control theory with interval analysis is proposed in this paper to effectively estimate the dynamic safety of the controlled structures, in which circumstances the unknown‐but‐bounded uncertainties in structural parameters are considered. The uncertain structural responses based on the closed‐loop control are firstly analyzed and embodied by the interval process model. By virtue of the first‐passage theory, an integral procedure of non‐probabilistic time‐dependent reliability analysis of the active control system for structural vibration is then conducted. Two engineering examples and one experimental application are eventually presented to demonstrate the validity and applicability of the methodology developed.
Journal Article
Analytical optimal design and performance evaluation of series tuned inerter damper for ground motion excited structures
The series tuned inerter dampers (STID) with distributed inerters are proposed in this paper to suppress seismic response for ground motion excited structures with broadband characteristics. In order to reveal the mechanism of the STID for vibration mitigation, the dimensionless displacement objective function of a single degree of freedom structure equipped with an STID under random Gaussian white noise base excitations is thereupon derived. Based on the principle of the reasonable distribution of inertance, the analytical optimal design parameters of STID are obtained under constraint for total inerter-mass ratio. The vibration mitigation performance of the STID is evaluated and further compared with the tuned inerter damper (TID), tuned mass damper (TMD) and typical series dampers using same mass ratio or inerter-mass ratio when structure is subjected to harmonic and random excitation. Results demonstrate that the performance of structural vibration control and broadband characteristics of STID outperform both the TMD and TID. On the condition of same inerter-mass ratio, the deformation enhancement of damping element can be further increased compared with TID because of dual-tuning effect of series inerters. The higher vibration control performance of STID is realized by using very small nominal damping ratio compared with the TMD and TID. Meanwhile, there exist two grounded inerters in STID compared to other series dampers, and both two subsystems are not affected by base random acceleration excitation which also brings STID a wider VSB and better seismic response mitigation effect. Substantially, due to STID is a type of dual-grounded inerter-based device, for force and base acceleration excited main system, the optimal expressions are identical. Hence, STID can adapt to more complex practical engineering and random and diverse excitations. Hence, the STID can be deemed to be a broadband, high effectiveness and high-performance inerter system. Meanwhile, considering low damping, lightweight and flexible install of STID, it is easier for implementation in practical engineering.
Journal Article
A least squares recursive gradient meshfree collocation method for superconvergent structural vibration analysis
A least squares recursive gradient meshfree collocation method is proposed for the superconvergent computation of structural vibration frequencies. The proposed approach employs the recursive gradients of meshfree shape functions together with smoothed shape functions in the context of least squares formulation, where both meshfree nodes and auxiliary points are taken as the collocation points. It turns out that this least squares formulation can effectively suppress the spurious modes arising from a direct meshfree collocation formulation using recursive gradients. Meanwhile, a detailed theoretical analysis with explicit frequency error measure is presented for the least squares recursive gradient meshfree collocation method in order to assess the frequency accuracy of structural vibrations. This analysis discloses the salient basis degree discrepancy issue regarding the frequency accuracy for the least squares meshfree collocation formulation, and it is shown that this issue can be essentially resolved by the proposed least squares recursive gradient meshfree collocation method. In fact, the proposed method leads to superconvergent vibration frequencies when odd degree basis functions are used, i.e., the frequency convergence rate is improved from
(
p
-
1
)
for the standard least squares meshfree collocation to
(
p
+
1
)
for the proposed approach in case of an odd
p
th degree basis function. This desirable frequency superconvergence of the proposed least squares recursive gradient meshfree collocation method is congruously demonstrated by numerical results.
Journal Article
Prediction of Structural Vibration Induced by Subway Operations Using Hybrid Method Based on Improved LSTM and Spectral Analysis
With the rapid expansion of urban subway networks, vibrations induced by subway operations have become an increasingly significant concern for nearby structures. To assess the influence of subway-induced vibrations on nearby structures, it is essential to predict the vibration effects accurately prior to the construction of the subway system. By combining an improved Long Short-Term Memory (LSTM) model with a spectral analysis, this paper proposes a hybrid method to enhance the accuracy and efficiency of predicting structural vibrations induced by subway operations. The improved LSTM model is composed of BiLSTM, an attention mechanism, and the DBO algorithm. The symmetry inherent in the vibration propagation paths and the structural layouts of subway systems is leveraged to improve the feature extraction and modeling accuracy. Additionally, the hybrid method utilizes the symmetric properties of vibration signals in the spectral domain to enhance prediction robustness and efficiency. Then, the hybrid method is utilized to rapidly achieve highly accurate vibration responses induced by subway operations. The verification results demonstrate the following: (1) The improved LSTM model enhances the ability to recognize patterns in time-series vibration data, leading to improved model convergence and generalization. The improved LSTM mode has a significant improvement in prediction accuracy compared to the standard LSTM network. For numerical simulation and real-world measured signals, values of R2 increased by 3% and 49.37%. (2) The proposed hybrid method significantly reduces computational time while ensuring results consistent with those obtained from the time-history analysis method. Applying the proposed hybrid method for data augmentation enhances the accuracy of the spectral analysis. The hybrid method achieves an improvement of 7% for the prediction accuracy.
Journal Article
A Crowd Load Model for Structural Vibration Evaluation of Building Cover in a Large-Span Railway Station
With the application of large-span building covers in high-speed railway stations, the issue of structural vibration comfort induced by crowd walking has aroused the attention of researchers. The randomness of the crowd flow on large-span building covers, combined with the conventional method adopting the worst load case to evaluate the human-induced structural vibration, leads to larger response results and a significant deviation from the actual scenario. In this study, a novel crowd-load model considering the inherent dual randomness associated with the trajectory of the crowd and walking load is proposed. It is developed by integrating the social force model with a random single person walking load. In addition, a corresponding framework for structural vibration calculation is proposed as well. Three crowd-loading models are established, accounting for randomness, by combining with the finite element model of the thin plate structure. The vibration response of the floor slab under crowd excitation was assessed in the waiting hall of Xiong'an high-speed railway station. Numerical simulation calculations were performed, comparing the results for three different types of crowd load. The findings indicate a significant reduction in the vibration response of the large-span waiting hall when employing the load model incorporating the social force model. This serves as a correction to the overly conservative nature of the conventional load model.
Journal Article
Vibration Control and Seismic Damages Reduction for Structural Buildings Based on Optimal Fractional-Order Controller and a Graphical User Interface Development
Introduction
This paper proposes an optimal active vibration control system to control an active tuned mass damper (ATMD), which can help reduce the seismic structural damages caused by the earthquake effects.
Methods
The proposed controller exploits the features of the fractional-order calculus to improve the performances of the derivative and the integral actions of the conventional PID controller, the parameters gains (
K
p
,
K
i
,
K
d
),
λ
and
μ
of the fractional-order PID controller (FO-PID) are selected optimally using the recent artificial hummingbird algorithm (AHA), A comparative study conducted against the classical PID controller in different earthquake excitations, to highlight the advantages of proposed FO-PID. Finally, A new graphical user interface (GUI) based on MATLAB called “SVCS Structural Vibration Control Simulator” is developed to facilitate the simulation of different vibration control systems using different earthquake excitations.
Conclusion
The results obtained reflect that using FO-PID controller improves the performance of active control and can reduce further the structural response.
Journal Article
Vibration analysis of electric motors considering rotating rotor structure using flexible multibody dynamics-electromagnetic-structural vibration coupled analysis
Abstract
In this study, we develop flexible multibody dynamic-electromagnetic-structural vibration coupled analysis method to accurately predict motor vibration by considering the electromagnetic force characteristics, rotating characteristics of rotating motor motors, and their interactions at the no-load rated speed and operating speed range. The structural characteristics are accurately reflected by developing a three-dimensional (3D) finite element model considering the entire components of the motor. The reliability of the 3D finite element model of the motor is verified using the impact hammer test. In addition, to consider the rotational characteristics of the rotor structure, we develop a flexible multibody dynamics model that connects the flexible rotor and the bearing with revolute joint. The vibration of the motor at the no-load rated speed is analyzed using flexible multibody dynamics-electromagnetic-structural vibration coupled analysis. Comparing the vibration test results, it is confirmed that the flexible multibody dynamics-electromagnetic-structural vibration coupled analysis result predicts the actual motor vibration more accurately than the conventional finite element analysis-based electromagnetic-structural vibration coupled analysis result. By using flexible multibody dynamics-electromagnetic-structural vibration coupled analysis in the operating speed range, it is confirmed that not only electromagnetic force harmonics but also sideband harmonics caused by rotor eccentricity-induced large vibrations, and also confirmed that it accurately predicts the vibration characteristics of actual motors with rotating rotors.
Graphical Abstract
Graphical Abstract
Journal Article
Deflections Governed by the Cyclic Strength of Rigid Pavement Subjected to Structural Vibration Due to High-Velocity Moving Loads
Objective
In the present study, the deflections governed by cyclic strength due to structural vibrations caused by high-velocity moving load on a rigid pavement have been evaluated.
Methods
A novel finite-element-based cyclic response model has been proposed in terms of velocity-induced stress ratio for the design of rigid pavement. It consists of a characteristic strength and the number of cycles of moving load. The central deflection of the rigid pavement is captured for varied loading inputs, velocities, and pavement thicknesses.
Results
The velocity-induced deflection zones have been identified for a set of selected velocities. A set of displacement contours have been observed along with a displacement shift and phase transformation in principal stress fields beyond a critical value. The vibrational compounded stress transfer mechanism (V-CSTM) for rigid pavement design has been presented using the thickness of the pavement, velocity, and intensity of the moving load. The results have been compared within the output obtained from numerically varied parameters utilizing codal provisions. The cyclic strength of the rigid pavement has been found as 0.01-0.2% of the characteristic strength. The findings imply that the rigid pavement will withstand 10
15
–10
9
cycles of moving load within the range of input parameters.
Societal benefits
The research outcomes provide a classified interpretation for the field engineers and practitioners to evaluate the life of rigid pavement supported by granular bases for construction practices.
Journal Article