Role of FEM in Spring Analysis

Shimoseki, Masayoshi; Hamano, Toshio; Imaizumi, Tsutomu

doi:10.1007/978-3-662-05044-6_3

Cited by 6 publications

(6 citation statements)

References 5 publications

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“…Considering the dimensions and stiffness of the spring, a variable force of 0–3 N was applied to the anchor point 1 on the left, F sl , and to the anchor point 2 on the right, F sr , (Figure a) to model the forces imposed by the spring. The spring stiffness of the NiTi spring, k spring , is calculated by where E NiTi = 83 GPa is the Young’s modulus of austenite NiTi …”

Section: Resultsmentioning

confidence: 99%

Toward Self-Control Systems for Neurogenic Underactive Bladder: A Triboelectric Nanogenerator Sensor Integrated with a Bistable Micro-Actuator

et al. 2018

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Aging, neurologic diseases, and diabetes are a few risk factors that may lead to underactive bladder (UAB) syndrome. Despite all of the serious consequences of UAB, current solutions, the most common being ureteric catheterization, are all accompanied by serious shortcomings. The necessity of multiple catheterizations per day for a physically able patient not only reduces the quality of life with constant discomfort and pain but also can end up causing serious complications. Here, we present a bistable actuator to empty the bladder by incorporating shape memory alloy components integrated on flexible polyvinyl chloride sheets. The introduction of two compression and restoration phases for the actuator allows for repeated actuation for a more complete voiding of the bladder. The proposed actuator exhibits one of the highest reported voiding percentages of up to 78% of the bladder volume in an anesthetized rat after only 20 s of actuation. This amount of voiding is comparable to the common catheterization method, and its one time implantation onto the bladder rectifies the drawbacks of multiple catheterizations per day. Furthermore, the scaling of the device for animal models larger than rats can be easily achieved by adjusting the number of nitinol springs. For neurogenic UAB patients with degraded nerve function as well as degenerated detrusor muscle, we integrate a flexible triboelectric nanogenerator sensor with the actuator to detect the fullness of the bladder. The sensitivity of this sensor to the filling status of the bladder shows its capability for defining a self-control system in the future that would allow autonomous micturition.

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Section: Resultsmentioning

confidence: 99%

Toward Self-Control Systems for Neurogenic Underactive Bladder: A Triboelectric Nanogenerator Sensor Integrated with a Bistable Micro-Actuator

et al. 2018

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“…In these methods, the effects of various physical and mechanical parameters are studied using a valid simulation of the problem without spending much time on the testing of each parameter. In the review performed by Shimoseki et al [22], it was also mentioned that the geometrical parameters of the springs have not been considered in the theoretical methods.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Curvature Correction Factor of Extension Spring

et al. 2020

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The curvature correction factor is an important parameter in the stress calculation formulation of a helical extension spring, which describes the effect of spring wire curvature on the stress increase towards its inner radius. In this study, the parameters affecting the curvature correction factor were investigated through theoretical and numerical methods. Several finite element (FE) models of an extension spring were generated to obtain the distribution of the tensile stress in the spring. In this investigation, the hook orientation and the number of coils of the extension spring showed significant effects on the curvature correction factor. These parameters were not considered in the theoretical model for the calculation of the curvature correction factor, causing a deviation between the results of the FE model and the theoretical approach. A set of equations is proposed for the curvature correction factor, which relates both the spring index and the number of coils. These equations can be applied directly to the design of extension springs with a higher safety factor.

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“…Imaizumi et al [3] explored the optimization of the hollow section coil spring, based on the optimization theory, the use of finite element analysis, control the load, coil diameter, the maximum design stress and other parameters for the set value, adjust the cross-sectional shape, lightweight spring, and can reduce the weight of about 50% compared to the initial solid circular section spring. Shimoseki et al [4] used a finite element analysis to simulate helical compression spring, indicating the contact between the spring and thread and the spring race.…”

Section: Introductionmentioning

confidence: 99%

Geometric Design of Rectangular Cross-Sectional Springs<sup></sup>

Hwang

Lin

2018

MSF

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In order to study the influence of the cross-sectional shape on the stiffness of a spring, a finite element analysis software DEFORM is used to simulate and analyze the torsion of rectangular cross-section bars. The material of the bar is TS1800 SAE9254 and the cross-section of aspect ratio (w / h) is 1.5. From literature it is known that when the rectangular section bar is twisted, the shear stress at the four corners is zero, so elliptical corners can decrease the volume and increase the stiffness with the same volume. Five levels for the long side of the elliptical corner are set as 1 to 5 mm, and 3 levels are set for the short side. Torsion of the rectangular section bars under 15 kinds of geometric designs are simulated to find the preferred cross-sectional shape design by evaluating the cross-sectional area, load, and the maximum shear stress. The objective of the design is obtaining a uniform stress distribution with a larger spring stiffness and lighter weight. The optimal cross section of the bars is established as the spring geometry, and the pre-loading processing of the spring is simulated. The required load and the maximum shear stress data are obtained. The effects of load, cross-sectional area and maximum shear stress on the springs performance are investigated.

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Role of FEM in Spring Analysis

Cited by 6 publications

References 5 publications

Toward Self-Control Systems for Neurogenic Underactive Bladder: A Triboelectric Nanogenerator Sensor Integrated with a Bistable Micro-Actuator

Toward Self-Control Systems for Neurogenic Underactive Bladder: A Triboelectric Nanogenerator Sensor Integrated with a Bistable Micro-Actuator

Investigation on the Curvature Correction Factor of Extension Spring

Geometric Design of Rectangular Cross-Sectional Springs<sup></sup>

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