Free vibration analysis of functionally graded beams using a higher-order shear deformation theory

Zaoui, Fatima Zohra; Lemya, Hanifi Hachemi Amar; Younsi, Abderahman; Meradjah, Mustapha; Tounsi, Abdelouahed; Ouinas, Djamel

doi:10.18280/mmep.040102

Cited by 16 publications

(8 citation statements)

References 12 publications

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“…Based on the sensitivity of electronic nose gas recognition, the transient response information model of wireless sensor is established, and the gas eigenvalue and mixed gas are identified to realize the qualitative and quantitative analysis of gas [14]. The gas sensing mechanism based on wireless gas sensor involves many theories such as material surface morphology, gas sensing material microstructure and gas response dynamics [15][16]. The wireless sensor for gas recognition detects gas by the change in the resistance value of the gas after reaction on the surface of the semiconductor thin film.…”

Section: Dynamic Analysis Of Wireless Sensor Responsementioning

confidence: 99%

Key Technology of Electronic Nose Gas Recognizer Based on Wireless Sensor Networks

Mei

2018

Int. J. Onl. Eng.

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<span style="font-family: 'Times New Roman',serif; font-size: 10pt; mso-fareast-font-family: 'Times New Roman'; mso-fareast-language: DE; mso-ansi-language: EN-US; mso-bidi-language: AR-SA;">Electronic nose gas recognizer is a kind of instrument simulating biological olfactory function for gas detection, which is widely applied in underground construction, aerospace, medical treatment and other fields. The sensing mechanism of the wireless sensor is complex. The wireless sensor array can realize the cross-response of the mixed gas, as well as data acquisition, processing and transmission by wireless transmission. This study applies the wireless sensor array to the electronic nose gas recognition technology, and conducts detection and recognition of three kinds of volatile gas, as well as analyzes the transient response of four wireless sensors and the transient response of wireless sensor array. It is found that the transient response curves are related to the characteristics and sample properties of wireless sensors, but not directly related to sample components. The whole transient response process includes four processes, namely steady state, rising process, maximum response and falling process. The response curve change of wireless sensor array to engine oil volatile gas is similar to that of diesel oil, but the conductance value is smaller than that of diesel oil gas response curve.</span>

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Section: Dynamic Analysis Of Wireless Sensor Responsementioning

confidence: 99%

Key Technology of Electronic Nose Gas Recognizer Based on Wireless Sensor Networks

Mei

2018

Int. J. Onl. Eng.

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“…In brief, the optical passive non-thermal design is to utilize the difference between the thermal characteristics of optical materials, eliminate the influence of temperature through reasonable combination of different characteristic materials, and reasonably match the optical power distribution scheme of the materials, so that the defocus of the optical system resulting from the change in temperature offsets the defocus of the the mechanical tube resulting from expanding with heat and contracting with cold, realizing the purpose of automatic temperature compensation. Strictly speaking, the non-thermal design of the optical system needs to meet the requirements of thermal elimination, achromatic aberration and optical power [9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Optical Passivementioning

confidence: 99%

Thermal environment adaptability design of space-based infrared imaging system

Hu¹,

Shi²,

Jiang³

et al. 2018

IJHT

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This study discusses the influence of temperature on infrared optical system and introduced the principle and method of non-thermal design. Based on the requirements of orbital thermal environment and technical indexes of a space-based infrared imaging system, this study conducts the thermal environment adaptability design of an imaging system. The nonthermal design of the optical system is carried out by combining active and passive methods, and thermal design and thermal analysis are carried out for the thermal environment of space orbit in which the system works. Finally, the final imaging system is validated by the thermal imaging experiment. The experimental results show that the system can eliminate the influence of temperature change on image quality in the temperature range of-20 ~ + 50 ℃, and can adapt to the thermal environment of space orbit. The imaging quality can meet the application requirements under different temperature conditions.

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“…In a study by Zohra et al [20], the critical buckling temperatures and natural frequencies of beams with a thickness functional gradient were investigated, and it was observed that the effects of shear deformation on frequencies tend to be more significant when the beams become shorter (thicker). These effects were more evident for higher mode frequencies.…”

Section: Introductionmentioning

confidence: 99%

Static and Free Vibration Analyses of Functionally Graded Plane Structures

Gaspar,

Loja,

Barbosa

2023

J. Compos. Sci.

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In recent years, the use of functionally graded materials has been the focus of several studies due to their intrinsic ability to be tailored according to the requirements of structures while minimising abrupt stress transitions commonly found in laminated composites. In most studies, the materials’ mixture gradient is established through a structural component, i.e., thickness, which is known to visibly enhance structural behaviour. However, depending on the type of structure, it is important to exploit the possibility of building a structure using other gradient directions. The innovative characteristic of this work, which aims to study plane truss and frame-type structures made of functionally graded materials, lies in the specificity that the materials’ mixture gradient occurs as a function of a geometric structure feature, i.e., for example, the structure height, rather than the more usual approach, as a component dependence, i.e., through a member thickness or even along its length. The performance of the present model is illustrated through a set of case studies, and where possible, the results achieved are compared with more traditional solutions.

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Free vibration analysis of functionally graded beams using a higher-order shear deformation theory

Cited by 16 publications

References 12 publications

Key Technology of Electronic Nose Gas Recognizer Based on Wireless Sensor Networks

Key Technology of Electronic Nose Gas Recognizer Based on Wireless Sensor Networks

Thermal environment adaptability design of space-based infrared imaging system

Static and Free Vibration Analyses of Functionally Graded Plane Structures

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