Structural connections between components are often weak areas in engineering *** nature,many biological materials with remarkablemechanical performance possess flexible and creative *** this work,we propose a novel b...
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Structural connections between components are often weak areas in engineering *** nature,many biological materials with remarkablemechanical performance possess flexible and creative *** this work,we propose a novel bioinspired interlocking tab considering both the geometry of the tab head and neck,and demonstrate a new approach to optimize the bio-inspired interlocking structures based on machine *** neural networks for different optimization objectives are developed and trained using a database of thousands of interlocking structures generated through finite element *** show that the proposed method is able to achieve accurate prediction of the mechanical response of any given interlocking *** optimized designs with different optimization objectives,such as strength,stiffness,and toughness,are obtained efficiently and *** optimum design predicted by machine learning is approximately 7.98 times stronger and 2.98 times tougher than the best design in the training set,which are validated through additive manufacturing and experimental *** machine learning-based optimization approach developed here can aid in the exploration of the intricate mechanism behind biological materials and the discovery of new material designs boasting orders of magnitude increase in computational efficacy over conventional methods.
A variety of soft wall-climbing robots have been developed that can move in certain *** of these soft robots can only move on conventional surfaces and lack adaptability to complex *** the adaptability of soft robots ...
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A variety of soft wall-climbing robots have been developed that can move in certain *** of these soft robots can only move on conventional surfaces and lack adaptability to complex *** the adaptability of soft robots on complex surfaces is still a challenging *** this end,we study the layered structure of the starfish tube foot and the valve flap structure in the water vascular system,and use an ultrasonic stress detector to study the stiffness distribution of the arm *** by the motion of the starfish,we present a bionic soft wall-climbing robot,which is driven by two groups of pneumatic feet and achieves body bending through active adaptation *** design the structure of the foot to flex to provide driving force,and there are suction cups at the end of the foot to provide *** soft foot has a simple structure design,adapts to a variety of surfaces,and does not damage the surface of the *** stiffness layers achieve stiffness changes by the principle of line *** Central Pattern Generator theory is introduced to coordinately control the multiple feet of the *** experiments,we verify the adaptability of the soft robot to curved *** research may provide a reference for the design and development of crawling soft robots on complex surfaces.
A differential microelectromechanical system(MEMS)quartz resonant accelerometer with a novel oscillating readout circuit is *** phase noise in a piezoelectric quartz resonant accelerometer has been systematically inve...
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A differential microelectromechanical system(MEMS)quartz resonant accelerometer with a novel oscillating readout circuit is *** phase noise in a piezoelectric quartz resonant accelerometer has been systematically investigated.A high-performance front-end is used to extract the motional charge from a piezoelectric quartz resonator for the first *** topology eliminates the tradeoff between the gain,bandwidth,and noise of the traditional *** proposed bandpass front-end provides a 14.5 M gain at the oscillation frequency with a phase drift of 0.04°,ensuring a high-quality factor for the quartz *** proposed bandpass front end also achieves input-referred current noise as low as 30.5 fA/√Hz,which helps improve the bias instability and resolution of the *** anti-aliasing phase shifter is designed to regulate the loop bandwidth and compensate for additional phase *** reduce the flicker noise introduced by the nonlinear effect,an amplitude limiter is used to set the resonator operating *** accelerometer achieves a frequency resolution of 14μHz/√Hz and bias instability of 32μHz with a±70 g full scale,54.5 Hz/g scale factor,and 552 Hz bandwidth.
Heat storage properties of phase change materials(PCMs) are essential characteristics that perform a key role in thermal heat energy storage *** thermal properties of PCMs can be improved by developing metal foam/PCM ...
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Heat storage properties of phase change materials(PCMs) are essential characteristics that perform a key role in thermal heat energy storage *** thermal properties of PCMs can be improved by developing metal foam/PCM *** addition of metal foam in PCMs has a significant effect on the thermal characteristics of *** this paper,the heat storage properties of two different metal foam/PCM composites were experimentally *** behavior of paraffin in metal foam(copper and iron-nickel)/paraffin composites concerning pure paraffin at a constant heat flux of 1000 W/m^(2) in three directions simultaneously(x,y,and z) was *** was infiltrated into copper and iron-nickel foams to develop composite materials which resulted in enhancing the thermal conductivity of the paraffin.A comparative analysis is made on the heat storage properties of paraffin in copper and iron-nickel foams/paraffin *** temperature distribution during the phase transition process is experimentally *** comparison indicates that temperature uniformity in copper foam/paraffin composite is better than in iron-nickel foam/paraffin composite and pure paraffin at the same heat *** results show that at heat flux of 1000 W/m^(2),the heat storage time for copper foam/paraffin composite is 20.63% of that of iron-nickel foam/paraffin composite.
Many buildings were constructed in the 1970s and 80s. They now face the problem of aging. Various studies have been conducted domestically and abroad to solve this aging problem. However, there are few studies on robo...
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1 Introduction In recent years,the rapid development of industrial big data and artificial intelligence(AI)technologies has revolutionized the industrial *** systems,such as manufacturing,energy,transportation,and log...
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1 Introduction In recent years,the rapid development of industrial big data and artificial intelligence(AI)technologies has revolutionized the industrial *** systems,such as manufacturing,energy,transportation,and logistics,have become increasingly complex,generating vast amounts of data[1–3].These big data encompass a wide range of data sources,including sensor data,production logs,and maintenance records,which hold valuable insights[4–6].Moreover,machine learning-based AI techniques can be applied to extract meaningful insights from this big data[7].
Lateral vibrations are occurring in rotating machinery and can limit operational performance and range. Such vibrations often lead to instability, decreased precision, and potential damage to the system. However, by i...
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Electric vehicles (EVs) are considered sustainable vehicles due to low carbon emissions. Lithium-ion batteries (LIBs) are expensive electrical vehicle batteries (EVBs) due to their expensive rare raw materials, i.e., ...
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Numerous research studies have found that a double-pass solar air heater (DPSAH) performs better than a single-pass solar air heater (SAH). This suggested study aims to evaluate the performance of a DPSAH setup in Sou...
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Ceramic matrix composites(CMCs)structural components encounter the dual challenges of severe mechanical conditions and complex electromagnetic environments due to the increasing demand for stealth technology in aerosp...
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Ceramic matrix composites(CMCs)structural components encounter the dual challenges of severe mechanical conditions and complex electromagnetic environments due to the increasing demand for stealth technology in aerospace *** address various functional requirements,this study integrates a biomimetic strategy inspired by gradient bamboo vascular bundles with a novel dual-material 3D print-ing *** distinct bamboo-inspired structural configurations Cf/SiC composites are designed and manufactured,and the effects of these different structural configurations on the CVI process are *** method is utilized to characterize the relationship between interface bonding strength and mechanical *** results reveal that the maximum flexural strength and fracture toughness reach 108.6±5.2 MPa and 16.45±1.52 MPa m1/2,respectively,attributed to the enhanced crack propagation resistance and path caused by the weak fiber-matrix ***,the bio-inspired configuration enhances the dielectric loss and conductivity loss,exhibiting a minimum reflection loss of-24.3 dB with the effective absorption band of 3.89 *** work introduces an innovative biomimetic strategy and 3D printing method for continuous fiber-reinforced ceramic composites,expanding the ap-plication of 3D printing technology in the field of CMCs.
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