Fast modification-aimed stress modal analysis of thin plates with holes/notches

Zhou, Yadong; Yile, Zhang; Zeng, Weili; Sun, Youchao

doi:10.1016/j.engstruct.2021.112248

Cited by 5 publications

(2 citation statements)

References 66 publications

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“…Zhou and Tao performed STM and exploited stress mode shapes to predict hotspots of multi-axial random fatigue [20]. In a recent article, Zhou et al leveraged SMT for local structural dynamic modification [21,22] of thin plates with holes/notches [23].…”

Section: Of 20mentioning

confidence: 99%

Strain Modal Testing with Fiber Bragg Gratings for Automotive Applications

Falcetelli

Martini

Sante

et al. 2022

Sensors

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Strain Modal Testing (SMT), based on strain sensors signal processing, is an unconventional approach to perform Experimental Modal Analysis which is typically based on data measured by accelerometers. SMT is still mainly restricted to academia and requires additional investigation for a successful transition towards industry. This paper critically reviews why the automotive sector can benefit from this relatively new approach for a variety of reasons. Moreover, a case study representative of the automotive field is analyzed and discussed. Specifically, an SMT methodology is applied to evaluate the modal properties of a reinforced composite roof belonging to a racing solar powered vehicle. In the experimental activity, signals from Fiber Bragg Grating (FBG) sensors, strain gauges, and accelerometers were simultaneously acquired and further processed. The advantages of using optical fibers were discussed, together with their weaknesses and ongoing challenges. The FBG results were compared with the conventional analysis performed with the accelerometers, emphasizing the main similarities and discrepancies.

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Section: Of 20mentioning

confidence: 99%

Strain Modal Testing with Fiber Bragg Gratings for Automotive Applications

Falcetelli

Martini

Sante

et al. 2022

Sensors

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“…Modal modification means to modify the dynamic properties of the structure for a vibration system based on the modal data after the modal analysis of the vibration system provides its modal parameters. To some extent, modal modification may achieve this type of natural frequency as desired by a designer, so as to avoid the excitation frequency of the external load and reduce vibration and noise.Therefore, it is presently a commonly used method for structural optimization in the engineering field [7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Modal Optimization Design of Supporting Structure Based on the Improved Particle Swarm Algorithm

2022

IJE

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To cope with the strong vibration of a supporting structure excited by external loads under operating conditions, and in order to achieve the purpose of vibration reduction by structural optimization through modal modification, a modal modification method was proposed, through structural vibration theory. Subsequently, the search performance of an improved particle swarm optimization method was analyzed before conducting a case study on the structural optimization. Finally, aiming at the problem of strong vibration of gun mount at the time of firing, a finite element model of the gun mount was constructed and the type and natural frequency of the gun vibration in a free state was analyzed. Meanwhile, taking the thickness, height and width of the stiffening structure of the bracket as the design variables, combined with the improved particle swarm algorithm, an optimized mathematical model was developed with the first-order natural frequency of the gun mount as the objective function. The secondary development of Abaqus finite element software by using Python is used as a tool to calculate the optimization model. By virtue of optimation, thickness, width and height of the stiffening structure are 156.4mm, 453.7mm and 238.9mm at the range of [100,600]mm, [100,700]mm, [100,700]mm, respectively, and the base frequency of the gun mount has been increased by 11.3%. The effect is remarkable.

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A novel 3D train–bridge interaction model for monorail system considering nonlinear wheel-track slipping behavior

Yang,

He,

Cai

et al. 2024

Nonlinear Dyn

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Variable speed operation of the train cause easily the wheel-track slipping phenomenon, inducing strong nonlinear dynamic behavior of the suspended monorail train and bridge system (SMTBS), especially under an insufficient wheel-track friction coefficient. To investigate the coupled vibration features of the SMTBS under variable speed conditions, a novel 3D train–bridge interaction model for the monorail system considering nonlinear wheel-track slipping behavior is developed. Firstly, based on the D’Alembert principle, the vibration equations of the vehicle subsystem are derived by adequately considering the nonlinear interactive behavior among the vehicle components. Then, a high-efficiency modeling method for the large-scale bridge subsystem is proposed based on the component mode synthesis (CMS) method. The vehicle and bridge subsystems are coupled with a spatial wheel-track interaction model considering the nonlinear wheel-track sliding behavior. Furtherly, by a comprehensive comparison with the field test data, the effectiveness of the proposed method is verified, as well as the reasonable modal truncation frequencies of the bridge subsystem are determined. On this basis, the dynamics performances of the SMTBS are evaluated under different initial braking speeds and wheel-track interfacial adhesion conditions; besides, the nonlinear wheel-track slipping characteristics and their influences on the vehicle–bridge interaction are also revealed. The analysis results indicate that the proposed model is reliable for investigating the time-varying dynamic features of SMTBS under variable train speeds. Both the axle load transfer phenomenon and longitudinal slip of the driving tire would be easy to appear under the braking condition, which would significantly increase the longitudinal vehicle–bridge dynamic responses. To ensure a good vehicle–bridge dynamics performance, it is suggested that the wheel-track interfacial friction coefficient is larger than 0.35.

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Fast modification-aimed stress modal analysis of thin plates with holes/notches

Cited by 5 publications

References 66 publications

Strain Modal Testing with Fiber Bragg Gratings for Automotive Applications

Strain Modal Testing with Fiber Bragg Gratings for Automotive Applications

Modal Optimization Design of Supporting Structure Based on the Improved Particle Swarm Algorithm

A novel 3D train–bridge interaction model for monorail system considering nonlinear wheel-track slipping behavior

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