Bionic Mechanical Analysis of Dragonfly Wings: The Feasibility of Mesh Combination to Improve Structural Stiffness

Wei, Yangyang; Guo, Huidi; Zhang, Siyi; Li, Jingyuan; Wang, Yihan; Liu, Chajuan

doi:10.13052/ejcm2642-2085.3142

Cited by 2 publications

(3 citation statements)

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“…Substituting Equation (20) into Equation (21), the relationship between the coefficients to be determined A m1 , A m2 , and B m1 , B m2 can be organized as follows…”

Section: Wave Mechanics Equationmentioning

confidence: 99%

“…The red layer is mainly soft rock, which is interstratified or laminated, with poor physical and mechanical properties, low strength, easy to soften in water, easy to disintegrate when losing water, rapid weathering in the open air, certain swelling and rheology, and poor engineering performance. For a long time, during the construction of highways, railroads, water conservancy, and hydropower projects, many professionals in rock mechanics have conducted studies on their special physical and mechanical properties, kinetic properties, and engineering characteristics, including weathering properties [1,2], disintegration properties [3,4], swelling properties [5][6][7][8][9][10], rheological properties [11][12][13][14][15][16][17], and mechanical properties of modified fillers of red soft rocks [18][19][20]. Among which the rheological properties of soils are the most complex, characterizing significant mechanical properties at both microscopic and macroscopic levels.…”

Section: Introductionmentioning

confidence: 99%

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Study of Rheological-Mechanical Properties and Vibration Mechanics Bandgap of Row Pile Foundation

Chen

Huang

et al. 2023

TECM

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To analyze the rheological and mechanical properties as well as the vibration-mechanical forbidden zone effect of row pile foundations, this paper employs time-dependent modulus to examine the rheological mechanics of soil. Drawing from viscoelastic theory, we derive the expression of deformation modulus in the frequency domain to analyze the frequency dependence of the shear modulus of rheological soils. We construct a continuous medium dynamics model of the pile-soil periodic structure, taking into account soil rheology, and derive the dispersion equation of shear waves in the periodic structure using the multiple scattering method. The band gap characteristics and parameters that influence the law of shear waves in rheological soil-row pile foundations are studied through the analysis of arithmetic cases. The results show that under the loading condition, the zero-frequency shear modulus of soil is larger than the initial modulus value, and the real part of the shear modulus decreases monotonically with the increase of frequency and finally converges to the initial modulus value; under the unloading condition, the zero-frequency shear modulus of soil is smaller than the initial modulus value, and the real part of the shear modulus increases monotonically with the increase of frequency and finally converges to the initial modulus value; the larger the relaxation time of soil, the faster the convergence rate; the imaginary part of the shear modulus of soil The imaginary part of the soil shear modulus is positive under loading condition and negative under unloading condition, the value of the imaginary part increases and then decreases with increasing frequency and finally converges to 0. The imaginary part reaches the peak at the critical frequency, the larger the relaxation time the smaller the critical frequency, and the peak of the imaginary part is independent of the relaxation time. This study analyzed the dispersion curve of shear waves in a pile-soil periodic structure and found that increasing low-frequency shear wave velocity in rheological soil pile foundation shifts the band gap position to a higher frequency band, resulting in a smaller band gap width than in linear elastic soil. The relaxation time of soil affects the frequency position and width of the band gap, with larger relaxation times resulting in higher frequency positions and smaller widths. Additionally, soil rheology widens the forbidden vibration band gap of the pile periodic structure when the filling rate of the pile foundation is larger.

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“…Substituting Equation (20) into Equation (21), the relationship between the coefficients to be determined A m1 , A m2 , and B m1 , B m2 can be organized as follows…”

Section: Wave Mechanics Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of Rheological-Mechanical Properties and Vibration Mechanics Bandgap of Row Pile Foundation

Chen

Huang

et al. 2023

TECM

View full text Add to dashboard Cite

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“…The key to topology optimization based on AM constraint (such as lattice, hierarchical structure, and reinforced thin wall) is proposed in [28]. However, the optimization of the mechanical properties of the body structure of the fast-forging hydraulic press and its theoretical analysis are still missing at home and abroad [29,30].…”

Section: Introductionmentioning

confidence: 99%

Force Characteristics and Mechanical Topology Optimization of Hydraulic Machine Structures: Statics and Dynamics

Xiao-lei

2023

TECM

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In this paper, the design requirements of the hydraulic testing machine are based on the actual force conditions. Static and dynamic performance analyses of the stressed components of the hydraulic machine are carried out and the mechanical topology is optimized. Combining the static and dynamic objective functions of the structure, a fast variable density topology method is proposed, thus improving the optimization efficiency. After setting the positions of the optimized and non-optimized regions. It can be found that the optimized mechanical performance is more superior as the number of iterations increases. The results show that the stress in the strut is 175.75 MPa and the maximum stress in the upper beam structure is 43.708 MPa. The first sixth order frequency is much higher than the operating frequency of 3 Hz. The final results of the mechanical topology optimization analysis show. The optimized structure of the upper, middle and lower crossbeams resulted in a mass reduction of 38%, 36% and 5.57%. The maximum stresses in the upper and middle crossbeams were reduced by 10.33%, 8.3% and 51.8%, respectively. The deformation was reduced by 6.14% at the fastest time; the inherent frequency of the first 3 orders was increased to achieve light weight. The overall mechanical properties became better after optimization, and the dynamic and static stability of the frame was improved. Translated with www.DeepL.com/Translator (free version)

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Bionic Mechanical Analysis of Dragonfly Wings: The Feasibility of Mesh Combination to Improve Structural Stiffness

Cited by 2 publications

References 0 publications

Study of Rheological-Mechanical Properties and Vibration Mechanics Bandgap of Row Pile Foundation

Study of Rheological-Mechanical Properties and Vibration Mechanics Bandgap of Row Pile Foundation

Force Characteristics and Mechanical Topology Optimization of Hydraulic Machine Structures: Statics and Dynamics

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