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Manufacturing fused silica hemispherical resonators using polymer glass suspension and replication molding 利用聚合物玻璃悬浮液和复制成型技术制造熔融石英半球形谐振器
IF 2.3 4区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-07-09 DOI: 10.1088/1361-6439/ad5b6a
Yahya Atwa, Hamza Shakeel
This work introduces a new method for manufacturing fused silica (FS)-based hemispherical resonators (HSRs) using a printable polymer glass mixture and replication molding. This process involves 3D printing to create the mold, followed by the casting of a photo-reactive pre-polymer glass mixture. This technique allows us to produce complex 3D geometries and offers faster production of resonators compared to other traditional methods. In this study, we manufactured three devices and successfully identified resonance modes with two (N = 2), three (N = 3) and four (N = 4) nodes/antinodes in all three HSRs, demonstrating the repeatability of our new manufacturing method. The highest quality factor of 482 k was achieved for the N = 3 resonance mode using the ring-down method. Some of the key advantages of our method include producing multiple devices efficiently with relatively good surface quality, making it a viable option for producing high-precision devices in the future. Our new fabrication technique results in a device surface roughness of ∼100 nm (measured over an area of 250 μm × 250 μm) and manufacturing yield of over 90%. Moreover, all the steps involved in this method can be completed outside of a specialized cleanroom environment.
这项研究介绍了一种利用可打印聚合物玻璃混合物和复制成型制造基于熔融石英(FS)的半球形谐振器(HSR)的新方法。该工艺包括先用三维打印技术制作模具,然后浇铸光反应预聚合物玻璃混合物。与其他传统方法相比,这种技术使我们能够制造出复杂的三维几何形状,并能更快地生产出谐振器。在这项研究中,我们制造了三个装置,并在所有三个 HSR 中成功识别了两个(N = 2)、三个(N = 3)和四个(N = 4)节点/阳极的共振模式,证明了我们新制造方法的可重复性。在 N = 3 谐振模式下,采用环降法获得了 482 k 的最高品质因数。我们的方法的一些主要优势包括能高效生产多个器件,且表面质量相对较好,这使其成为未来生产高精度器件的可行选择。我们的新制造技术可使器件表面粗糙度达到 ∼100 nm(测量面积为 250 μm × 250 μm),制造良率超过 90%。此外,这种方法所涉及的所有步骤都可以在专门的无尘室环境之外完成。
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引用次数: 0
Design optimization and experimental verification of ultrasonic stack for micro hot embossing of polymers 用于聚合物微热压花的超声波叠层的设计优化和实验验证
IF 2.3 4区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-07-04 DOI: 10.1088/1361-6439/ad5c6e
Ahmed Abdel-Aleem, Ahmed M R Fath El-Bab, Masahiko Yoshino, Hassan A El-Hofy and Mohsen A Hassan
Ultrasonic micro hot embossing (UMHE) is a prominent technique used in numerous sectors to produce micro parts since it is cheaper, faster, and more accurate. Amplitude uniformity is a crucial parameter in UMHE in order to manufacture micro parts with accurate dimensions and high-quality surfaces, even though limited research has been conducted on the uniformity of ultrasonic amplitude at the horn face during the embossing process. This paper presents an experimental and numerical study for designing an ultrasonic transducer and horn tailored to the micro hot embossing of polymer micro parts. A finite element (FE) simulation model combined with the Taguchi method has been developed to optimize the horn geometry and maximum amplitude uniformity. The Taguchi orthogonal array of 25 design runs has been generated and simulated using the developed FE modal analysis model, and then the optimized geometry was used to fabricate the horn. Applied torque and operating time calibrate and evaluate the transducer vibration characteristics. Experimental and simulation results revealed that the fabricated ultrasonic transducer and horn of a straight microfeature has a natural frequency of 28.8 kHz and has an 11 µm average peak-to-peak amplitude with 0.963 amplitude homogeneity along the microfeature face. The achieved frequency separation was greater than 0.85 kHz, whereas the gain ratio was 1.2. The design methodology developed in this paper showed great potential and has been numerically validated for various microfeature shapes across the horn face. Consequently, it can be applied to various ultrasonic applications beyond UMHE.
超声波微型热压印(UMHE)因其成本更低、速度更快、精度更高,已成为众多行业生产微型零件的重要技术。为了制造具有精确尺寸和高质量表面的微型零件,振幅均匀性是 UMHE 的一个关键参数,尽管对压花过程中喇叭面超声波振幅均匀性的研究还很有限。本文通过实验和数值研究,介绍了如何设计适合聚合物微型零件微热压印的超声波换能器和喇叭。结合田口方法开发了一个有限元(FE)仿真模型,以优化喇叭的几何形状和最大振幅均匀性。使用所开发的有限元模态分析模型生成并模拟了包含 25 个设计运行的田口正交阵列,然后使用优化后的几何形状制造喇叭。应用扭矩和工作时间校准和评估了传感器的振动特性。实验和模拟结果表明,制作的超声波换能器和直微特征喇叭的固有频率为 28.8 kHz,平均峰-峰振幅为 11 µm,沿微特征面的振幅均匀度为 0.963。实现的频率分离大于 0.85 kHz,而增益比为 1.2。本文开发的设计方法显示出巨大的潜力,并对喇叭面上的各种微特征形状进行了数值验证。因此,它可以应用于 UMHE 以外的各种超声波应用。
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引用次数: 0
Microfluidic carbon cloth-based enzymatic glucose biofuel cell for sustainably powering a microelectronic circuit * 用于为微电子电路提供可持续动力的微流体碳布基酶法葡萄糖生物燃料电池 *
IF 2.3 4区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-07-04 DOI: 10.1088/1361-6439/ad5b6b
S Vanmathi and Sanket Goel
Enhancing enzymatic microfluidic biofuel cells (EBFCs) devices has garnered significant attention due to the development of microfluidic ultra-low power energy-gathering techniques. To facilitate the ability to create microfluidic EBFCs, a carbon cloth (CC) has been considered since they are effective renewable energy sources and utilized as the ideal paper-based substitute for traditional power supplies for a variety of tiny devices due to their inherent qualities and exceptional performance. The developed microfluidic EBFC utilized glucose as a fuel, carbon cloth as the bioelectrode, Glucose oxidase for the anode, and laccase for the cathode. The maximum stable open circuit voltage of CC-EBFC was measured to be 475 mV with a peak power density of 85 µW cm−2 at 300 mV and a current density of 484 µA cm−2. The power performance of the device was improved by bovine serum albumin and a booster circuit, which was also coated and connected to the load to stabilize the performance. The novelty of the work is that using a flexible substrate of carbon cloth, with a microfluidic channel, has an added advantage in the biofuel cell. LTC3108EDE DC–DC booster was used to increase energy and attain a high charging voltage of 5 V to operate a digital watch up to 3 V. With minimal weight and flexibility; this minuscule device opens up new possibilities to sustainably power wearable and portable microelectronic devices.
由于微流体超低功耗能量收集技术的发展,酶促微流体生物燃料电池(EBFCs)装置的改进引起了广泛关注。碳布(CC)是一种有效的可再生能源,由于其固有的品质和优异的性能,被用作各种微小设备的传统电源的理想纸质替代品。所开发的微流体 EBFC 利用葡萄糖作为燃料,碳布作为生物电极,葡萄糖氧化酶作为阳极,漆酶作为阴极。经测量,CC-EBFC 的最大稳定开路电压为 475 mV,300 mV 时的峰值功率密度为 85 µW cm-2,电流密度为 484 µA cm-2。牛血清白蛋白和增压电路改善了该装置的功率性能,增压电路也涂有涂层并连接到负载上以稳定性能。这项工作的新颖之处在于,使用带有微流体通道的柔性碳布基底在生物燃料电池中具有额外的优势。LTC3108EDE DC-DC 升压器被用来增加能量,并达到 5 V 的高充电电压,使数字手表的工作电压达到 3 V。
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引用次数: 0
Neutron-absorption gratings fabricated by ultrasound-assisted filling method based on gadolinium particles 基于钆颗粒的超声辅助填充法制造中子吸收光栅
IF 2.3 4区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-07-03 DOI: 10.1088/1361-6439/ad5b69
Yaohu Lei, Xiqi Li, Chi Wei, Zhuozhao Li, Guiwen Xu, Xin Liu, Jianheng Huang, Shengxiang Wang and Ji Li
Neutron differential phase-contrast imaging (DPCI) plays a pivotal role in analyzing magnetic domain structures and field gradients in materials, necessitating high-quality neutron absorption gratings for enhanced fringe contrast. Traditional fabrication techniques, typically filling gadolinium (Gd) or Gd-containing materials into the corresponding grating structures, face challenges in achieving optimal Gd filling ratios and thickness, limiting the neutron DPCI system’s performance. This paper introduces an approach utilizing ultrasound-assisted filling method to introduce Gd particles into grating trenches with dense deposition, achieving an absorption grating period of 42 μm. This method achieves an equivalent Gd thickness of 80.3 μm, corresponding to the filling ratio of 53.53%, as confirmed by scanning electron microscopy and x-ray micro-imaging. The utilization of an ultrasound not only improves the Gd filling ratio, but also suggests potential scalability for large-area grating production, marking a significant advancement in neutron DPCI technology by providing high-quality components.
中子差分相位对比成像(DPCI)在分析材料中的磁畴结构和磁场梯度方面发挥着关键作用,需要高质量的中子吸收光栅来增强条纹对比度。传统的制造技术通常是在相应的光栅结构中填充钆(Gd)或含钆材料,在实现最佳钆填充率和厚度方面面临挑战,从而限制了中子DPCI系统的性能。本文介绍了一种利用超声辅助填充法将 Gd 颗粒引入光栅沟槽并进行密集沉积的方法,实现了 42 μm 的吸收光栅周期。经扫描电子显微镜和 X 射线显微成像确认,这种方法实现了 80.3 μm 的等效钆厚度,相当于 53.53% 的填充率。超声波的使用不仅提高了钆的填充率,还表明了大面积光栅生产的潜在可扩展性,通过提供高质量的组件,标志着中子 DPCI 技术的重大进步。
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引用次数: 0
Insights into molecular and bulk mechanical properties of glassy carbon through molecular dynamics simulations and mechanical tensile testing 通过分子动力学模拟和机械拉伸测试深入了解玻璃碳的分子和块体机械特性
IF 2.3 4区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-07-03 DOI: 10.1088/1361-6439/ad5693
Manali Kunte, Lucía Carballo Chanfón, Surabhi Nimbalkar, James Bunnell, Emanuel Rodriguez Barajas, Mario Enrique Vazquez, David Trejo-Rodriguez, Carter Faucher, Skelly Smith and Sam Kassegne
With increasing interest in the use of glassy carbon (GC) for a broad range of application areas, the need for developing a fundamental understanding of its mechanical properties has come to the forefront. Furthermore, recent theoretical and modeling works that highlight the synthesis of GC via the pyrolysis of polymer precursors has explored the possibilities of a revisit to the investigation of their mechanical properties at a fundamental level. Although there are isolated reports on the experimental determination of its elastic modulus, insights into the stress-strain behavior of a GC material under tension and compression obtained through simulations, either at the molecular level or for the bulk materials, are missing. This study fills the gap at the molecular level and investigates the mechanical properties of GC using molecular dynamics (MD) simulations, which model the atomistic-level formation and breaking of bonds using bond-order-based reactive force field formulations. The molecular model considered in this simulation has a characteristic 3D cage-like structure of five-, six-, and seven-membered carbon rings and graphitic domains of a flat graphene-like structure. The GC molecular model was subjected to loading under varying strain rates (0.4, 0.6, 1.25, and 2.5 ns−1) and temperatures (300 K–800 K) in each of the three axes: x, y, and z. The simulations show that the GC nanostructure has distinct stress-strain curves under tension and compression. In tension, MD modeling predicted a mean elastic modulus of 5.71GPa for a single GC nanostructure with some dependency on the strain rate and temperature, whereas, in compression, the elastic modulus was also found to depend on the strain rate and temperature and was predicted to have a mean value of 35 GPa. To validate the simulation results and develop experimental insights into the bulk behavior, mechanical tests were conducted on dog-bone-shaped testing coupons that were subjected to uniaxial tension and loaded until failure. The GC test coupons demonstrated a bulk modulus of 17 ±2.69 GPa in tension, which compares well with those reported in the literature. However, comparing MD simulation outcomes to those of uniaxial mechanical testing reveals that the bulk modulus of GC in tension found experimentally is higher than the modulus of single GC nanostructures predicted by MD modeling, which inherently underestimates the bulk modulus. With regard to failure modes, the MD simulations predicted failure in tension accompanied by the breaking of carbon rings within the molecular structure. In contrast, the mechanical testing demonstrated that failure modes are dominated by brittle failure planes largely due to the amorphous structure of GC.
随着人们对将玻璃碳(GC)应用于广泛领域的兴趣与日俱增,从根本上了解玻璃碳机械特性的必要性已凸显出来。此外,最近的理论和建模工作强调了通过热解聚合物前驱体合成玻璃碳,这为从根本上重新研究其机械特性提供了可能性。虽然有个别关于弹性模量实验测定的报告,但通过分子水平或大块材料的模拟,对 GC 材料在拉伸和压缩条件下的应力-应变行为还缺乏深入了解。本研究填补了分子水平上的空白,并利用分子动力学(MD)模拟研究了 GC 的机械特性,该模拟利用基于键序的反应力场公式对原子水平的键形成和断裂进行建模。该模拟中考虑的分子模型具有由五元、六元和七元碳环组成的三维笼状结构以及扁平石墨烯状结构的石墨域。在不同的应变速率(0.4、0.6、1.25 和 2.5 ns-1)和温度(300 K-800 K)条件下,GC 分子模型在 x、y 和 z 三个轴上分别受到加载。在拉伸过程中,MD 模型预测单个 GC 纳米结构的平均弹性模量为 5.71GPa,与应变速率和温度有一定关系;而在压缩过程中,弹性模量也与应变速率和温度有关,预测平均值为 35GPa。为了验证模拟结果,并通过实验深入了解块体行为,对狗骨形测试券进行了机械测试,测试券受到单轴拉伸和加载,直至失效。GC 试样在拉伸时的体模为 17 ±2.69 GPa,与文献报道的结果相差无几。然而,将 MD 模拟结果与单轴机械测试结果进行比较后发现,实验发现的 GC 拉伸时的体积模量高于 MD 建模预测的单个 GC 纳米结构的模量,而 MD 建模本质上低估了体积模量。关于失效模式,MD 模拟预测拉伸失效伴随着分子结构内碳环的断裂。相反,机械测试表明,主要由于 GC 的无定形结构,失效模式以脆性失效平面为主。
{"title":"Insights into molecular and bulk mechanical properties of glassy carbon through molecular dynamics simulations and mechanical tensile testing","authors":"Manali Kunte, Lucía Carballo Chanfón, Surabhi Nimbalkar, James Bunnell, Emanuel Rodriguez Barajas, Mario Enrique Vazquez, David Trejo-Rodriguez, Carter Faucher, Skelly Smith and Sam Kassegne","doi":"10.1088/1361-6439/ad5693","DOIUrl":"https://doi.org/10.1088/1361-6439/ad5693","url":null,"abstract":"With increasing interest in the use of glassy carbon (GC) for a broad range of application areas, the need for developing a fundamental understanding of its mechanical properties has come to the forefront. Furthermore, recent theoretical and modeling works that highlight the synthesis of GC via the pyrolysis of polymer precursors has explored the possibilities of a revisit to the investigation of their mechanical properties at a fundamental level. Although there are isolated reports on the experimental determination of its elastic modulus, insights into the stress-strain behavior of a GC material under tension and compression obtained through simulations, either at the molecular level or for the bulk materials, are missing. This study fills the gap at the molecular level and investigates the mechanical properties of GC using molecular dynamics (MD) simulations, which model the atomistic-level formation and breaking of bonds using bond-order-based reactive force field formulations. The molecular model considered in this simulation has a characteristic 3D cage-like structure of five-, six-, and seven-membered carbon rings and graphitic domains of a flat graphene-like structure. The GC molecular model was subjected to loading under varying strain rates (0.4, 0.6, 1.25, and 2.5 ns−1) and temperatures (300 K–800 K) in each of the three axes: x, y, and z. The simulations show that the GC nanostructure has distinct stress-strain curves under tension and compression. In tension, MD modeling predicted a mean elastic modulus of 5.71GPa for a single GC nanostructure with some dependency on the strain rate and temperature, whereas, in compression, the elastic modulus was also found to depend on the strain rate and temperature and was predicted to have a mean value of 35 GPa. To validate the simulation results and develop experimental insights into the bulk behavior, mechanical tests were conducted on dog-bone-shaped testing coupons that were subjected to uniaxial tension and loaded until failure. The GC test coupons demonstrated a bulk modulus of 17 ±2.69 GPa in tension, which compares well with those reported in the literature. However, comparing MD simulation outcomes to those of uniaxial mechanical testing reveals that the bulk modulus of GC in tension found experimentally is higher than the modulus of single GC nanostructures predicted by MD modeling, which inherently underestimates the bulk modulus. With regard to failure modes, the MD simulations predicted failure in tension accompanied by the breaking of carbon rings within the molecular structure. In contrast, the mechanical testing demonstrated that failure modes are dominated by brittle failure planes largely due to the amorphous structure of GC.","PeriodicalId":16346,"journal":{"name":"Journal of Micromechanics and Microengineering","volume":"44 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141551344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Edge smoothness enhancement of digital lithography based on the DMDs collaborative modulation 基于 DMD 协作调制的数字光刻边缘平滑度增强技术
IF 2.3 4区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-06-27 DOI: 10.1088/1361-6439/ad58e9
Jingya Zhang, Ningning Luo and Deyuan Chen
The rough saw-tooth edge caused by the inherent microstructures of digital micromirror device (DMD) will reduce the quality of the lithography pattern. Comprehensively considering the manufacturing efficiency, precision and cost, we propose a DMDs collaborative modulation lithography method to improve the smoothness of the lithography pattern edge. Through combining two misaligned DMDs to collaboratively modulate exposure dose, the better edge smoothness can be achieved. Collaborative exposure with 1/2 DMD pixel misalignment and 1/4 DMD pixel misalignment are both implemented to form the step-shape lithography patterns. The experimental results show that the saw-tooth edge can approximate to a straight line when increasing the number of times of the collaborative exposure. Further error analysis indicates it is effective to improve the edge smoothness while ensuring the lithography quality by using the collaborative modulation lithography. These results indicate that the DMDs collaborative modulation lithography is a promising technique for fabrication of microstructures, which may be a solution for balancing the fabrication precision, efficiency and cost.
数字微镜器件(DMD)固有的微结构所造成的粗糙锯齿边缘会降低光刻图案的质量。综合考虑制造效率、精度和成本,我们提出了一种 DMD 协同调制光刻方法,以提高光刻图案边缘的平滑度。通过结合两个错位的 DMD 来协同调制曝光剂量,可以获得更好的边缘平滑度。1/2 DMD 像素错位和 1/4 DMD 像素错位的协同曝光均可形成阶梯形光刻图案。实验结果表明,随着协同曝光次数的增加,锯齿边缘可以接近直线。进一步的误差分析表明,使用协同调制光刻技术能在保证光刻质量的同时有效提高边缘平滑度。这些结果表明,DMD 协同调制光刻技术是一种很有前途的微结构制造技术,它可能是一种平衡制造精度、效率和成本的解决方案。
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引用次数: 0
Nonlinear design, analysis, and testing of a single-stage compliant orthogonal displacement amplifier with a single input force for microgrippers 单级顺应式正交位移放大器的非线性设计、分析和测试(用于微型夹具的单一输入力
IF 2.3 4区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-06-27 DOI: 10.1088/1361-6439/ad5a19
Weilin Chen, Zuyang Fan, Qinghua Lu, Yujie Xu, Zhihang Li, Huiling Wei, Qinghua Zhang and Lufeng Luo
To achieve dexterous and stable micro/nanomanipulation, a large grasping stroke, compact design, and parallel grasping are required for microgrippers; thus, a single-stage compliant orthogonal displacement amplifier (CODA) with a single input force would be an ideal transmission mechanism. However, the existing small-deflection-based design schemes cannot adapt to large deflections or shearing effect, thereby affecting the orthogonal movement transformation accuracy. This study proposed, analyzed, and experimentally investigated a nonlinear design scheme for a single-stage CODA with a single input force. First, the nonlinear design principle is described qualitatively. By combining closed-form analytical modelling, finite element analysis, and numerical fitting, the nonlinear extent of a pre-set variable cross-sectional beam in the CODA is formulated. By utilizing the beam constraint model and small-deflection-based modelling, the nonlinear extent of the undetermined uniform straight beam in the CODA is derived. Based on the design principle and nonlinear models, a nonlinear design scheme is proposed quantitatively. Finite element simulations and experimental tests are conducted to verify the proposed scheme, and the limitations of our previous study are revealed.
为了实现灵巧稳定的微型/纳米机械手操作,微型机械手需要大抓取行程、紧凑设计和平行抓取;因此,单级顺应式正交位移放大器(CODA)与单一输入力将是理想的传动机构。然而,现有的基于小挠度的设计方案无法适应大挠度或剪切效应,从而影响了正交运动转换精度。本研究提出了一种单输入力单级 CODA 的非线性设计方案,并对其进行了分析和实验研究。首先,对非线性设计原理进行了定性描述。通过结合闭式分析建模、有限元分析和数值拟合,提出了 CODA 中预设变截面梁的非线性程度。利用梁约束模型和基于小挠度的建模,推导出 CODA 中未确定均匀直梁的非线性范围。根据设计原理和非线性模型,定量提出了非线性设计方案。通过有限元模拟和实验测试来验证所提出的方案,并揭示了我们之前研究的局限性。
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引用次数: 0
Micromechanical piezoelectric micromachined ultrasonic transducer array package enhancement with integrated frontliners 利用集成前沿增强微机械压电微机械超声波换能器阵列封装
IF 2.3 4区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-06-26 DOI: 10.1088/1361-6439/ad5a18
Hongxiang Shu, Weiliang Ji, Xiangyu Sun, Zhanqiang Xing and Xu He
In order to improve the susceptibility of ultrasonic transducers to damage and the mismatch in acoustic impedance with test specimens, an impedance-matching layer is introduced between the transducer and the specimen. The impact of the matching layer on acoustic propagation of transducer was analyzed through acoustic field simulation. The performance of the improved transducer was experimentally evaluated by using a dedicated echo testing system for transducers. The matching layer was optimized by considering different materials. The results show that for non-metallic materials, only a layer of acoustic matching layer (organic silicone gel) can be added to achieve acoustic impedance matching and avoid wear. For metal materials, two acoustic matching layers (organic silicone gel and epoxy resin) need to be added to achieve acoustic impedance matching. The propagation efficiency of sound waves is increased by 30% as a result of this process.
为了改善超声波换能器对损坏的敏感性以及与测试试样之间的声阻抗失配,在换能器和试样之间引入了阻抗匹配层。通过声场模拟分析了匹配层对换能器声波传播的影响。使用传感器专用回声测试系统对改进后的传感器性能进行了实验评估。通过考虑不同的材料,对匹配层进行了优化。结果表明,对于非金属材料,只需添加一层声学匹配层(有机硅胶)即可实现声阻抗匹配并避免磨损。对于金属材料,需要添加两层声学匹配层(有机硅凝胶和环氧树脂)才能实现声阻抗匹配。通过这一工艺,声波的传播效率可提高 30%。
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引用次数: 0
Development of piezoresistive flexible sensor with dual-height cylindrical microstructure surfaces to achieve vehicle vibration monitoring 开发具有双高圆柱形微结构表面的压阻柔性传感器,实现车辆振动监测
IF 2.3 4区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-06-17 DOI: 10.1088/1361-6439/ad5564
Decheng Zhang, Jiaqing Xie, Xiaoyu Meng, Haoran Pang, Ruqian Sun, Haiyan Fan, Xiaohui Nan and Zhikang Zhou
This research proposed a vibration monitoring device based on a piezoresistive flexible sensor with microstructured surfaces to achieve a simple acquisition of vibration information in the driver’s cabin of automobiles. The shape, size and arrangement mode of microstructures on the piezoresistive flexible sensor performance were investigated by finite element simulation. The polydimethylsiloxane/hydroxylated multi walled carbon nanotubes (PDMS/MWCNTs-COOH) composite membranes were prepared by the combination of high-pressure spraying and spinning coating method. The electromechanical response curves of the piezoresistive flexible sensor composed of a double-layer PDMS/MWCNTs-COOH composite membranes based on a dual-height cylindrical microstructure were tested. A vibration monitoring device was developed to process the signals obtained by the fabricated piezoresistive flexible sensor, and the vibration response of the car cab under different driving conditions was investigated. The results indicated that the cylindrical microstructure with small size can improve the sensitivity of the fabricated piezoresistive flexible sensor. Compared with the single-height and dual-height cylindrical microstructure, the piezoresistive flexible sensor with dual-height cylindrical microstructure can expand the detection range, and improve the linearity and sensitivity. The piezoresistive flexible sensor exhibits excellent performance, with a sensitivity of 1.774 kPa−1 and a detection range is 0–0.5 kPa. The above advances can improve the authenticity of the collected data, and provide a basis for the processing and analysis of the vibration signal before improving the noise, vibration and harshness performance of the vehicle.
本研究提出了一种基于具有微结构表面的压阻柔性传感器的振动监测装置,以实现对汽车驾驶室内振动信息的简单采集。通过有限元模拟研究了微结构的形状、尺寸和排列方式对压阻柔性传感器性能的影响。采用高压喷涂和旋涂相结合的方法制备了聚二甲基硅氧烷/羟基多壁碳纳米管(PDMS/MWCNTs-COOH)复合膜。测试了基于双高圆柱形微结构的双层 PDMS/MWCNTs-COOH 复合膜组成的压阻柔性传感器的机电响应曲线。开发了一种振动监测装置来处理所制造的压阻柔性传感器获得的信号,并研究了汽车驾驶室在不同驾驶条件下的振动响应。结果表明,小尺寸的圆柱形微结构可以提高制作的压阻柔性传感器的灵敏度。与单高和双高圆柱形微结构相比,双高圆柱形微结构的压阻柔性传感器可以扩大检测范围,提高线性度和灵敏度。这种压阻柔性传感器性能优异,灵敏度为 1.774 kPa-1,检测范围为 0-0.5 kPa。上述进展可以提高采集数据的真实性,并为振动信号的处理和分析提供依据,进而改善车辆的噪声、振动和颠簸性能。
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引用次数: 0
Data-driven estimation of battery state-of-health with formation features 利用化成特征以数据为驱动估算电池健康状况
IF 2.3 4区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2024-06-16 DOI: 10.1088/1361-6439/ad520c
Weilin He, Dingquan Li, Zhongxian Sun, Chenyang Wang, Shihai Tang, Jing Chen, Xin Geng, Hailong Wang, Zhimeng Liu, Linyu Hu, Dongchen Yang, Haiyan Tu, Yuanjing Lin and Xin He
Accurately estimating the state-of-health (SOH) of a battery is crucial for ensuring battery safe and efficient operation. The lifetime of lithium-ion batteries (LIBs) starts from their manufacture, and the performance of LIBs in the service period is highly related to the formation conditions in the factory. Here, we develop a deep transfer ensemble learning framework with two constructive layers to estimate battery SOH. The primary approach involves a combination of base models, a convolutional neural network to combine electrical features with spatial relationships of thermal and mechanical features from formation to subsequent cycles, and long short-term memory to extract temporal dependencies during cycling. Gaussian process regression (GPR) then handles SOH prediction based on this integrated model. The validation results demonstrate highly accurate capacity estimation, with a lowest root-mean-square error (RMSE) of 1.662% and a mean RMSE of 2.512%. Characterization on retired cells reveals the correlation between embedded formation features and their impact on the structural, morphological, and valence states evolution of electrode material, enabling reliable prediction with the corresponding interplay mechanism. Our work highlights the value of deep learning with comprehensive analysis through the relevant features, and provides guidance for optimizing battery management.
准确估算电池的健康状况(SOH)对于确保电池安全高效运行至关重要。锂离子电池(LIB)的使用寿命始于其制造过程,而锂离子电池在使用期间的性能与工厂的形成条件密切相关。在此,我们开发了一种具有两个构造层的深度转移集合学习框架,用于估算电池的 SOH。主要方法包括基础模型、卷积神经网络和长短期记忆的组合,前者将电学特征与从形成到后续循环的热和机械特征的空间关系结合起来,后者则提取循环过程中的时间依赖关系。然后,高斯过程回归(GPR)根据这一综合模型处理 SOH 预测。验证结果表明,容量估算非常准确,最小均方根误差 (RMSE) 为 1.662%,平均 RMSE 为 2.512%。对退役电池的表征揭示了嵌入形成特征之间的相关性及其对电极材料的结构、形态和价态演变的影响,从而能够利用相应的相互作用机制进行可靠的预测。我们的工作凸显了深度学习通过相关特征进行综合分析的价值,并为优化电池管理提供了指导。
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Journal of Micromechanics and Microengineering
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