Article
Automation & Control Systems
Xiaolong Liu, Hui Liu, Jindong Tan
Summary: This article presents a numerical model for predicting actuation frequencies of SMA actuators, taking into consideration factors such as heat convection methods, bias loads, and Joule heating. Experimental verification demonstrates differences between predicted and measured frequencies, highlighting the impact of different bias loads on actuation frequency accuracy.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2021)
Article
Materials Science, Multidisciplinary
Dinesh K. K. Patel, Xiaonan Huang, Yichi Luo, Mrunmayi Mungekar, M. Khalid Jawed, Lining Yao, Carmel Majidi
Summary: This study achieves multimodal locomotion of soft robots using highly compact and dynamic bistable soft actuators. These actuators can swiftly transform between two oppositely curved states and generate a force of 0.3 N. The consistency and robustness of the actuator response are experimentally validated. The compact and fast-responding properties of the soft bistable actuator allow it to be used as an artificial muscle for shape-reconfigurable soft robots capable of multiple modes of SMA-powered locomotion.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Engineering, Civil
Junjun Guo, Kang Gao, Xinzhi Dang, Yue Zheng, Hao Liang
Summary: An innovative multi-level shape memory alloy (SMA) cable damper is proposed for bridges in near-fault seismic regions. The study presents a constitutive material model for simulating SMA cables and introduces a seismic fragility analysis framework using Box-Cox transformation and Bayesian inference. The proposed SMA damper reduces damage probabilities of the bridge and careful selection of damper parameters is needed for desired seismic performance.
ENGINEERING STRUCTURES
(2023)
Review
Construction & Building Technology
Chenxi Shao, Yonghui Huang
Summary: This paper introduces the method of reinforcing steel structures using shape memory alloys (SMAs) and the latest research progress, opportunities, and challenges in the field of steel structural reinforcement. The properties of SMAs, the construction forms and working mechanisms of various components are detailed. The application of SMAs in steel structure reinforcement and its effects are analyzed.
Article
Automation & Control Systems
Christopher Bishop, Matteo Russo, Xin Dong, Dragos Axinte
Summary: This article introduces a novel design and motion strategy for underactuated continuum robots (CRs). Shape memory alloy wires are used to control clutches that lock cables for section locking. The proposed design includes beaded cables for improved clutching strength. The prototype demonstrates a mean repeatability of 1.41mm, with section locking achieved in 1 s and section unlocking achieved in 5 s.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2022)
Article
Engineering, Electrical & Electronic
Wei Wang, Wenxin Zeng, Aydin Sadeqi, Sameer Sonkusale
Summary: A battery-free solution utilizing shape memory alloy (SMA) to capture interesting temperature events and record temperature history is presented in this study. Experimental validation demonstrates the feasibility of monitoring and recording temperature events at 30 degrees Celsius using SMA, showing practicality and effectiveness of the proposed approach.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
Article
Construction & Building Technology
Xiaohong Long, Yongtao Ma, Yu Miao, Bin Ruan
Summary: This study proposes a flexible circumferential joint based on shape memory alloy for seismic mitigation of shield tunnels. The joint is shown to have good energy dissipation and self-recovery effects, and can meet the mechanical performance requirements. It improves the seismic safety of tunnel structures.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Peng Chen, Yunfan Liu, Na Min, Meimei Wang, Xiaorong Cai, Mingjiang Jin, Xuejun Jin
Summary: In this study, an excellent two-way shape memory effect (TWSME) with large magnitude and small cyclic degradation of NiTi wires is achieved by combining martensite deformation and nanocrystallization. The wires exhibit a maximum TWSME strain of 7.37% after being pre-deformed to 11% and maintain a stable strain of 6.88% after 20 cycles. The excellent TWSME is attributed to the dislocation structures induced by martensite deformation and the nanocrystalline strengthened matrix.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Civil
Xuhong Zhou, Bin Han, Ke Ke, Jin Di, Fengjiang Qin, Long Hu
Summary: This study investigates the mechanical properties of Shape Memory Alloys (SMAs) plates under cyclic tension-compression loading. The findings reveal asymmetric stress-strain curves and different residual strains under varied conditions.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Electrical & Electronic
Suhel Khan, Yeswanth S. Pydi, S. S. Mani Prabu, I. A. Palani, Pushpendra Singh
Summary: A shape memory alloy (SMA) based aerodynamic composite fin has been developed as an alternative to control the direction of a conventional missile without using a motor. Optimized parameters and adaptive composite actuation were used to achieve maximum displacement and control of the fin.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Chemistry, Physical
Yajiao Yang, Christian Leinenbach, Moslem Shahverdi
Summary: In this study, TC-PRISMA was used to simulate the precipitation characteristics of an FeMnSi-based shape memory alloy during one-step and two-step aging processes. The results were validated using transmission electron microscopy (TEM) to examine the microstructures, particularly the VC precipitates. Thermomechanical characterization was conducted to investigate the recovery stress of the FeMnSi-SMA under the different aging conditions. The simulation results showed that two-step aging achieved a similar precipitation state in a significantly shorter time compared to one-step aging, and the recovery stress and fracture strain differed between the two conditions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Civil
Bin Wang, Songye Zhu
Summary: This study conducted a systematic experimental investigation on the cyclic behavior of iron-based shape memory alloys (Fe-SMAs) and evaluated their performance under tension-compression loadings. The results show that Fe-SMAs exhibit satisfactory performance with excellent deformation capability and fatigue behavior, providing a promising solution for developing high-performance seismic devices.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Electrical & Electronic
Hangyeol Baek, Abdul Manan Khan, Youngshik Kim
Summary: In this research, a simple and innovative bidirectional shape memory alloy (SMA) actuator is presented for use in compliant rotary joints of small bio-inspired robots. The actuator consists of a SMA wire, a rotation axis, and supporting elements. The SMA wire, in a double bend shape, provides forward and backward rotation without the need for additional hardware, such as transmission mechanisms or antagonistic force elements.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Nanoscience & Nanotechnology
Maryam Mohri, Irene Ferretto, Christian Leinenbach, Dohyung Kim, Dimitrios G. Lignos, Elyas Ghafoori
Summary: This study systematically investigated the effects of heat and thermomechanical treatments on the pseudo-elastic behavior of an Fe-based shape-memory alloy. The results showed that decreasing the grain size and precipitation of VCs resulted in an improved pseudo-elasticity. The thermomechanical treatment decreased the number of thermal twins and developed a [111] texture in the austenite phase, which reduced the critical stress for inducing martensite.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Tonghui Tang, Kecai Xie, Chengyang Li, Shouyu Sun, Zhongjing Ren, Jianping Yuan, Peng Yan
Summary: This paper reports a novel SMA spring driven soft crawling robot with feet of constant curvature, which effectively alleviates the nonlinearity of the robotic reconstruction. An analytical static model for the step length of the robot's crawling gait was built based on 11 independent design parameters, and the influential significance of each parameter was studied. This work provides an efficient approach to the design, prediction, evaluation, and optimization of such soft crawling robots for diverse application surroundings.
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
(2023)
Article
Physics, Condensed Matter
Lars Bumke, Christoph Chluba, Hinnerk Ossmer, Christiane Zamponi, Manfred Kohl, Eckhard Quandt
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2018)
Article
Physics, Condensed Matter
Volodymyr A. Chernenko, Victor A. L'vov, Saurabh Kabra, Ivan R. Aseguinolaza, Manfred Kohl, Hideki Hosoda, Jose M. Barandiaran
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2018)
Article
Materials Science, Multidisciplinary
Jan Frenzel, Gunther Eggeler, Eckhard Quandt, Stefan Seelecke, Manfred Kohl
Review
Energy & Fuels
Florian Bruederlin, Lars Bumke, Christoph Chluba, Hinnerk Ossmer, Eckhard Quandt, Manfred Kohl
Article
Engineering, Electrical & Electronic
Lukas Liedtke, Marcel Gueltig, Manfred Kohl
INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS
(2019)
Article
Physics, Applied
S. Rastjoo, X. Wang, A. Ludwig, M. Kohl
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Engineering, Electrical & Electronic
Sanaz Rastjoo, Randy Fechner, Lars Bumke, Mirko Koetz, Eckhard Quandt, Manfred Kohl
MICROELECTRONIC ENGINEERING
(2020)
Article
Chemistry, Physical
Joel Joseph, Makoto Ohtsuka, Hiroyuki Miki, Manfred Kohl
Summary: This study presents a lumped element model to describe the dynamic properties of thermomagnetic generators based on MSMA films, showcasing their potential for high power density. The model is validated for specific conditions and can be used to assess the potential impact of decreasing Curie temperature on waste heat recovery.
Article
Energy & Fuels
Mickael Lallart, Linjuan Yan, Hiroyuki Miki, Gael Sebald, Gildas Diguet, Makoto Ohtsuka, Manfred Kohl
Summary: The study focuses on the development of a heat engine using MultiPhysic Memory Alloys (MPMAs) to convert heat into electricity, offering a more direct energy conversion path compared to traditional mechanical heat engines. By thermally decoupling the pyroelectric element from the MPMA, higher variation frequency can be achieved.
Article
Engineering, Mechanical
Lena Seigner, Georgino Kaleng Tshikwand, Frank Wendler, Manfred Kohl
Summary: The study presents the design, fabrication, and characterization of single and antagonistic SMA microactuators for uni- and bi-directional self-folding of origami-inspired devices. Experimental and finite element simulations were used to analyze the stress-strain characteristics of the SMA foil and the self-folding process. The results showed that single-SMA microactuators can achieve up to 180 degrees of bending angle, while antagonistic SMA microactuators demonstrated bi-directional self-folding in the range of -44 degrees to +40 degrees.
Article
Engineering, Mechanical
Kiran Jacob, Aditya Suryadi Tan, Thomas Sattel, Manfred Kohl
Summary: A hybrid damper concept combining magnetorheological fluid (MRF) and shape memory alloy (SMA) has been proposed. The performance of different MRF-SMA configurations has been investigated, demonstrating the complementarity of operation between MRF and SMA dampers, resulting in improved damping performance and reduced energy consumption.
Article
Engineering, Mechanical
Emil R. Mamleyev, Chun Him Lee, Jan G. Korvink, Manfred Kohl, Kirill V. Poletkin
Summary: This paper presents the results of a comprehensive study on the pull-in phenomenon in a hybrid levitation microactuator. Square-shaped proof masses of different sizes were electromagnetically levitated and their pull-in actuation was measured. The study found that the pull-in actuation is nonlinearly dependent on the size, mass, and levitation height of the proof masses. Extensive simulation and direct comparison with experimental results showed a good agreement between theory and experiments.
Article
Chemistry, Multidisciplinary
Joel Joseph, Erika Fontana, Thibaut Devillers, Nora M. Dempsey, Manfred Kohl
Summary: Thermomagnetic generation is a promising technology for converting low-grade waste heat into electricity. The development of efficient thermomagnetic generators requires tailored thermomagnetic materials and innovative designs for fast heat transfer. This study reports on the performance of a Gadolinium (Gd)-film-based thermomagnetic generator optimized for resonant self-actuation near room temperature, which exhibits high oscillation frequencies and large strokes, resulting in efficient conversion of thermal energy into electrical energy.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Mechanical
Gowtham Arivanandhan, Zixiong Li, Sabrina M. Curtis, Lisa Hanke, Eckhard Quandt, Manfred Kohl
Summary: We propose a novel design approach to optimize the power consumption of cantilever-based shape memory alloy (SMA)/Si bimorph microactuators. By utilizing finite element simulation, additional folded beams are designed in the perpendicular direction to homogenize the temperature distribution along the cantilevers. The temperature-homogenized SMA/Si microactuators exhibit a significant reduction in power consumption compared to the conventional double-beam cantilever design, up to 48%.
Article
Thermodynamics
F. Welsch, J. Ullrich, H. Ossmer, M. Schmidt, M. Kohl, C. Chluba, E. Quandt, A. Schuetze, S. Seelecke
CONTINUUM MECHANICS AND THERMODYNAMICS
(2018)
Article
Engineering, Electrical & Electronic
Kehao Feng, Zhenghua Zhang, Guohua Bai, Xiuyuan Fan, Rongzhi Zhao, Xuefeng Zhang
Summary: This paper proposes a new method to accurately evaluate the high-frequency power loss of soft magnetic materials. Through a two-step calibration, the system is able to compensate for the phase angle discrepancy between the exciting current and induced voltage, enabling a higher power loss measurement frequency.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Mingfang Kang, Tong Liu, Hongmei Sun, Lin Li, Keliang Wang
Summary: In this study, the absorption performance of ambient nitrogenous toxic gases on a monolayer of blue phosphorus phase germanium selenide (GeSe) was investigated using density-functional theory calculations. The results showed that GeSe monolayer exhibits higher sensitivity and selectivity for the hazardous gas NO.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Yaqiong Niu, Zhicheng Zou, Longsheng Cheng, Chaofeng Ye
Summary: This paper proposes a novel method to stabilize the laser diode output using a close-loop control with two feedbacks. The proposed method performs better for long-time operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jiajie Li, Ying Liu, Zhen Chai, Qian Cao, Renjie Li, Yueyang Zhai
Summary: This study proposed an efficient and high-quality beam-splitting method based on a diffractive optical element, enabling multichannel SERF atomic magnetometers to achieve ultra-high consistency and sensitivity. It has significant applications in array biomagnetic measurement systems.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
E. Oliveira, C. Doering, H. Fouckhardt
Summary: With the development of Lab on a chip technology, fluid management using dispersed droplets has become an important approach. Electrowetting on dielectric (EWOD) is one method for droplet actuation, but it requires prior definition of droplet positions. Optoelectrowetting (OEW) goes further by allowing changes in electrical parameters through impinging light spots, without the need for predefined droplet positions. This study re-evaluates the key parameters of OEW and explores their effects on droplet actuation using numerical optimization methods.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Haipeng Wang, Zhiguo Wang, Gancheng Zhu, Shuai Zhang
Summary: A novel capacitive proximity skin was developed to improve the performance of robotics in handling liquid-filled containers. This skin features a flexible structure that can adapt to different grippers and seamlessly integrate with Robot Operating System. Experimental results demonstrated that this proximity skin achieved data-lossless detection and contactless measurement of liquid level, making it suitable for grasping operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Tsenguun Byambadorj, Xiangyu Zhao, Yutao Qin, Yogesh B. Gianchandani
Summary: In this research, a monolithically microfabricated Knudsen pump (KP) without suspended membranes was presented. These pumps offer improved mechanical robustness, wider process window, and simplified microfabrication process compared to previous designs. The experimental results matched the modeling results well, indicating the potential for monolithic integration onto complex lab-on-a-chip systems.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Hamed Karami, Saeed Karami Chemeh, Vahid Azizi, Hooman Sharifnasab, Jose Ramos, Mohammed Kamruzzaman
Summary: Aroma is a significant quality trait for pharmaceutical plants and their products, indicating the quality of the raw material. An electronic nose is an efficient approach for identifying and evaluating the aroma of essential oils. In this study, tarragon was dried at different temperatures and air velocities, and the purity of tarragon essential oil was evaluated using an electronic nose. Multivariate data analysis and artificial neural networks modeling were employed to quantify and classify the obtained essential oils.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Xiaoyang Duan, Dan Xu, Wenjun Jia, Ran Li, Bohao Sun, Ruitian Yan, Wenjie Zhao
Summary: Flower-like WO3/WS2 heterojunction materials constructed via a low-temperature in-situ oxidation method exhibit significant improvements in the detection of NO2 gas in gas sensors, along with good selectivity and reproducibility.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Peng Yu, Mengyang Zhang, Manqi You, Yuxi Gao, Landong Xiao, Yan Peng, Jingxia Lai, Zhouzhao Shi, Siwei Luo, Gencai Guo, Gang Guo
Summary: Recent studies have shown that two-dimensional Janus transition metal dichalcogenides (TMDs) have great potential for applications in gas sensors. By conducting first principles calculations, this study explores the potential application of Pd-doped monolayer HfSeS as gas sensor materials for detecting CO, CO2, NH3, and NO. The results demonstrate the good thermodynamical stability and reversible adsorption of these molecules on both pristine and Pd-doped HfSeS, with Pd-doped HfSeS showing higher sensitivity towards NO due to its metallic behavior upon NO adsorption.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jinlan Yang, Linjiao Li, Jun Huang, Quan Zhang, Hiba Affane
Summary: This study proposes a method for large-scale aggregation of micro-particles by creating a vortex region using low-frequency oscillation. Experimental results show that this method can achieve a large aggregation area and has the advantages of low cost and low power consumption.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jitendra Singh, Saurabh Kumar Gupta, Vinita
Summary: In this investigation, a Surface Acoustic Wave (SAW) formalin gas sensor was explored for low-level formalin gas sensing applications. The sensor showed stable response and high sensitivity to formalin gas concentration, making it a reliable and useful sensor for room temperature operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Junyao Wang, Yahao Liu, Huan Liu, Qi Hou, Jianxin Xu, Hongxu Pan, Jingran Quan, Yansong Chen, Hanbo Yang, Lixiang Li
Summary: A flexible electrode with a serpentine-shaped tetra-chiral structure was designed to improve the mechanical properties and prevent mechanical fracture of flexible electrodes. The research demonstrated that this structure reduced the maximum tensile stress by 87.19% compared to the existing tetra-chiral structure. The flexible electrode remained conductive even at a strain of 70% and showed resistance values of 5 ohm and 4.4 ohm at a bending angle of 180 degrees and after 1000 fold cycles. Furthermore, the flexible electrodes showed great potential in biological signal monitoring, particularly in collecting ECG and pulse signals.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Taihao Chen, Yong Fang, Mengru Zhu, Zhiwei Zhao, Wei Lei, Zhuoya Zhu, Helong Jiang
Summary: Flexible dual-spectral carbon nanodots/flexible n-silicon heterojunction photodetectors with high responsivity and detectivity are reported. These detectors show photo response in UV illumination and only in forward bias under visible illumination. The photocurrent of the device remains high even under bending strain.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
M. S. Sikandar Bathusha, Israr Ud Din, Rehan Umer, Kamran A. Khan
Summary: Graphene-based nanomaterials are used as embedded sensors to monitor fracture behavior in composite structures. This study investigates the in-situ crack propagation and fracture behavior in a glass fiber reinforced polymer composite using embedded reduced graphene oxide coated fabrics and highly conductive graphene nanoplatelet paper.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
