A study of NiTi shape memory alloy springs and its application in a new robotic actuator

Wen, Mei; Tu, Gan Feng; Zong, Q.; Xie, Caoyin

doi:10.1109/icit.1994.467126

Cited by 11 publications

(4 citation statements)

References 2 publications

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“…This effect can be exploited to generate a useful stroke for a mechanical actuator. Indeed, SMAs have been widely investigated and have been used in many applications, such as the actuation of rigid joints, the fabrication of micropumps, moving robotic arms, moving wing trailing edges, the actuation of separation devices for satellites, and the actuation of odontology devices [ 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Development of a Combined Micro-Macro Mechanics Analytical Approach to Design Shape Memory Alloy Spring-Based Actuators and Its Experimental Validation

Riccio

Napolitano

Sellitto

et al. 2021

Sensors

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In this work, an analytical procedure for the preliminary design of shape memory alloy spring-based actuators is investigated. Two static analytical models are considered and interconnected in the frame of the proposed procedure. The first model, based on the works from An, is able to determine the material properties of the SMA components by means of experimental test data and is able to size the SMA component based on the requirements of the system. The second model, based on a work from Spaggiari, helps to design and size an antagonist spring system that allows one to obtain the geometric characteristics of springs (SMA and bias) and the mechanical characteristics of the entire actuator. The combined use of these models allows one to define and size a complex SMA actuator based on the actuation load requirements. To validate the design procedure, static experimental tests have been performed with the entire SMA actuator.

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Section: Introductionmentioning

confidence: 99%

Development of a Combined Micro-Macro Mechanics Analytical Approach to Design Shape Memory Alloy Spring-Based Actuators and Its Experimental Validation

Riccio

Napolitano

Sellitto

et al. 2021

Sensors

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“…De igual manera, los alambres pueden tener forma de resortes, para obtener actuadores con mejor rendimiento, que son el resultado de una compensación entre la carrera máxima y la fuerza; sin embargo, esto depende de factores geométricos. Los resortes de SMA tienen múltiples aplicaciones, incluida la actuación de juntas rígidas (Bergamasco et al, 1989), (Wen et al, 1994), que generan movimiento de flexión y extensión. Además, de las peculiaridades mencionadas anteriormente, son buenos candidatos para robots bioinspirados y biomiméticos, donde el peso ligero, las pequeñas dimensiones y la baja rigidez son esenciales (Cortez Vega et al, 2018), (Colorado et al, 2011), (Cianchetti et al, 2014), (Luna et al, 2017).…”

Section: Introductionunclassified

Caracterización de las SMAs y sus aplicaciones: Una revisión

Paez-Pidiache¹,

Lozada‐Castillo²,

Luviano‐Juárez³

2021

ICBI

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Los materiales elaborados a partir de aleaciones con memoria de forma (SMA) son clasificados como "materiales inteligentes", pues presentan características como : alta relación fuerza / peso, bajo peso y accionamiento silencioso. El Nitinol es una aleación metálica con una relación de 50% Ni - 50% Ti (NiTi) que se entrena en memoria y forma,la cual es ampliamente utilizada para imitar el comportamiento de los músculos humanos, pues al calentarse se contraen, debido al efecto de memoria de forma, y regresan a su forma al enfriarse. Una de las maneras de emplear el NiTi en aplicaciones biomédicas y caracterizar el material, es a partir del diseño de actuadores a base de SMAs. Este trabajo presenta algunos métodos para la caracterización de actuadores con SMA y además hace una revisión, definido antes para usar las aplicaciones biomédicas desde el descubrimiento del NiTi y la implementación en sistemas de rehabilitación actuales.

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“…Wires can be shaped as springs, to obtain actuators capable of performances that are the result of a trade off between maximum stroke and force, which depend only on geometrical factors. SMA springs have multiple applications, including the actuation of rigid joints [10,11], providing bending motion in flexible structures [12], or fabrication of micropumps [13]. Moreover, thanks to all the above-mentioned peculiarities, they are good candidates for biomimetic and bioinsipired robots, where light weight, small dimensions and low stiffness are fundamental.…”

Section: Introductionmentioning

confidence: 99%

A general method for the design and fabrication of shape memory alloy active spring actuators

Follador

Cianchetti

Arienti

et al. 2012

Smart Mater. Struct.

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Shape memory alloys have been widely proposed as actuators, in fields such as robotics, biomimetics and microsystems: in particular spring actuators are the most widely used, due to their simplicity of fabrication. The aim of this paper is to provide a general model and the techniques for fabricating SMA spring actuators. All the steps of the design process are described: a mechanical model to optimize the mechanical characteristic for a given requirement of force and available space, and a thermal model for the estimation of the electrical power needed for activation. The parameters of both models are obtained by experimental measurements, which are described in the paper. The models are then validated on springs manufactured manually, showing also the fabrication process. The design method is valid for the dimensioning of SMA springs, independently from the external ambient conditions. The influence on the actuator bandwidth was investigated for different working environments, providing numerical indications for the utilization in underwater applications. The spring characteristics can be calculated by the mechanical model with an accuracy of 5%. The thermal model allows one to calculate the current needed for activation under different ambient conditions, in order to guarantee activation in the specific loading conditions. Moreover, two solutions were found to reduce the power consumption by more than 40% without a dramatic reduction of bandwidth.

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A study of NiTi shape memory alloy springs and its application in a new robotic actuator

Cited by 11 publications

References 2 publications

Development of a Combined Micro-Macro Mechanics Analytical Approach to Design Shape Memory Alloy Spring-Based Actuators and Its Experimental Validation

Development of a Combined Micro-Macro Mechanics Analytical Approach to Design Shape Memory Alloy Spring-Based Actuators and Its Experimental Validation

Caracterización de las SMAs y sus aplicaciones: Una revisión

A general method for the design and fabrication of shape memory alloy active spring actuators

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