Optimization for Large or Linear Tunable Stiffness Control With a Concentric Circular Tapered Beam Design

2017 ◽  
Author(s):  
Shane Johnson ◽  
Anton Van Beek ◽  
Zeeshan Qaiser ◽  
Liping Kang
Keyword(s):  
Virtual Work ◽  
Optimum Shape ◽  
The Novel ◽  
Unit Load ◽  
Beam Design ◽  
Unit Load Method ◽  
3D Printed ◽  
Loading Modes ◽  
Tunable Stiffness ◽  
Novel Design

Most examples of structure controlled Tunable Stiffness Mechanisms (TSM) systems have two predefined settings of stiffness, e.g. bi-stiffness behavior, or they have a low range in tunable stiffness. In this research, this problem of control is overcome though optimization of a novel concentric circular tapered spring beam design with the novel design concept of changing the mode of deformation from bending to axial or shear. A Monte Carlo (MC) function is used with an analytical model — the unit load method of virtual work, to determine the optimum shape of two concentric tapered beams where the minimum stiffness is set, and the objective is to achieve linear and/or large stiffness change control. Three optimum designs were 3D printed, tested, and the stiffness vs. loading angle of control was validated with excellent correlation. The optimum design was obtained by changing the dominant loading modes.

Design and Analysis of a New Mechanism for a Snake Like Robot

2020 ◽  
Author(s):  
Johnathon Garcia ◽  
Kooktae Lee
Keyword(s):  
Power Loss ◽  
Robot Design ◽  
The Novel ◽  
Loss Minimization ◽  
Positive Power ◽  
Unit Distance ◽  
Novel Structure ◽  
3D Printed ◽  
Numerical Minimization ◽  
Novel Design

Abstract In this paper, a novel snake like robot design is presented and analyzed. The structure described desires to obtain a robot that is most like a snake found in nature. This is achieved with the combination of both rigid and soft link structures by implementing a 3D printed rigid link and a soft cast silicone skin. The proposed structure serves to have a few mechanical improvements while maintaining the positives of previous designs. The implementation of the silicone skin presents the opportunity to use synthetic scales and directional friction. The design modifications of this novel design are analyzed on the fronts of the kinematics and minimizing power loss. Minimization of power loss is done through a numerical minimization of three separate parameters with the smallest positive power loss being used. This results in the minimal power loss per unit distance. This research found that the novel structure presented can be effectively described and modeled, such that they could be applied to a constructed model.

scholarly journals Design and development of a 3D-printed back-pressure regulator

2020 ◽  
Author(s):  
Lee Walmsley ◽  
Emilie Sellier
Keyword(s):  
Low Cost ◽  
Flow Chemistry ◽  
Back Pressure ◽  
The Novel ◽  
Pressure Regulator ◽  
Pump Head ◽  
3D Printed ◽  
Design Software ◽  
Novel Design ◽  
Cost Components

In this communication, we describe the novel design and preparation of a back-pressure regulator that can be used in flow chemistry applications. Using low-cost components that can be readily sourced, a low-cost 3D printer and freeware design software, we developed, and 3D printed a back-pressure regulator that is simple to assemble and resistant to blocking. This device can be used to maintain the pressure of a fluidic system between the pump head to the back-pressure regulator and allows the collector, or collection vessel to be at atmospheric pressure. Ensuring control of pressure within the fluidic system is essential for maintaining consistent flow rates in flow chemistry set ups.

scholarly journals Design and Development of 3D Printed Catalytically-Active Stirrers for Chemical Synthesis

2019 ◽  
Author(s):  
Matthew Penny ◽  
Stephen Hilton
Keyword(s):  
Chemical Synthesis ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
The Novel ◽  
Mannich Reactions ◽  
Catalytically Active ◽  
3D Printed ◽  
Novel Design ◽  
Preparation And Evaluation

<p>In this present study, we describe the novel design, preparation and evaluation of catalyst-impregnated stirrer beads for chemical synthesis. Using a low-cost SLA 3D printer and freeware design software, a high surface area holder for a magnetic stirrer bead was developed and 3D printed containing <i>p</i>-toluenesulfonic acid. The devices were used to efficiently catalyze Mannich reactions in excellent yields and it was demonstrated that the devices can be re-used up to 5-times with excellent reproducibility.</p>

scholarly journals Design and Development of 3D Printed Catalytically-Active Stirrers for Chemical Synthesis

2019 ◽  
Author(s):  
Matthew Penny ◽  
Stephen Hilton
Keyword(s):  
Chemical Synthesis ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
The Novel ◽  
Mannich Reactions ◽  
Catalytically Active ◽  
3D Printed ◽  
Novel Design ◽  
Preparation And Evaluation

<p>In this present study, we describe the novel design, preparation and evaluation of catalyst-impregnated stirrer beads for chemical synthesis. Using a low-cost SLA 3D printer and freeware design software, a high surface area holder for a magnetic stirrer bead was developed and 3D printed containing <i>p</i>-toluenesulfonic acid. The devices were used to efficiently catalyze Mannich reactions in excellent yields and it was demonstrated that the devices can be re-used up to 5-times with excellent reproducibility.</p>

Unit Load Method for Deflections of Planar, Nonlinear Structures

1980 ◽  
Vol 102 (4) ◽  
pp. 781-786 ◽  
Author(s):  
G. Szuladzinski
Keyword(s):  
Finite Element ◽  
Virtual Work ◽  
Nonlinear Material ◽  
Nonlinear Structures ◽  
Unit Load ◽  
Complementary Energy ◽  
Finite Element Program ◽  
Unit Load Method ◽  
Element Program ◽  
Work Method

The unit load method, which is also known as a virtual work method, as well as by several other names, is a widely used tool for calculating deflections of linear structures. A procedure is developed here, which consists of similar steps and can be used when nonlinear material is involved. The formulae are developed based on the concept of complementary energy and the Castigliano theorem extended to nonlinear systems. A few simple examples are solved using this method and the results are compared with those obtained by a finite-element program. It appears that a blend of both types of analysis may be the optimal tool in many situations.

EVALUATION OF MOUNTAIN AREA AS NON-POINT SOURCE OF NITROGEN FOR SETO INLAND SEA: THE NORTHERN SHIKOKU REGION, JAPAN

2017 ◽  
Author(s):  
Shohei Morisawa ◽  
Shohei Morisawa ◽  
Yukio Komai ◽  
Yukio Komai ◽  
Takao Kunimatsu ◽  
...  
Keyword(s):  
Average Concentration ◽  
Point Sources ◽  
Seto Inland Sea ◽  
Mountain Streams ◽  
Unit Load ◽  
Mountain Areas ◽  
Mountain Area ◽  
The Seto Inland Sea ◽  
Unit Load Method ◽  
Important Position

The northern Shikoku region is located in the Western part of Japan and faces towards the Seto Inland Sea. The forest area, which is one of the non-point sources in the Seto Inland Sea watershed, occupies 75% of the land use in the watershed of the northern Shikoku region. The amount of loadings of nutrients and COD in the Seto Inland Sea has been estimated by the unit load method but actually the data has not been investigated. It is however, necessary to know the real concentration of nitrogen in mountain streams to evaluate the role which is the mountain area plays as non-point sources. Therefore, more water samples of mountain streams in the watershed need to be taken and the concentrations of nitrogen analyzed. The mountain streams in the northern Shikoku area were investigated from April, 2015 to November, 2015. The number of sampling sites was 283, in addition to the past data by Kunimatsu et al. The average concentration of nitrate nitrogen in Ehime, Kagawa, and Tokushima was 0.61mg/L, 0.78mg/L and 0.34mg/L, respectively. The environmental standard range for nitrogen in the Seto Inland Sea is from between less than 0.2mg/L and less than 1mg/L. Therefore, the average concentration of nitrogen in these regions was over category II, and those of mountain streams in Kagawa Prefecture exceeded category III. About 20% of mountain streams were more than 1mg/L. It has become clear that mountain areas occupy an important position as non-point sources for the Seto Inland Sea.

scholarly journals A millifluidic chip for cultivation of fish embryos and toxicity testing fabricated by 3D printing technology

RSC Advances ◽  
2021 ◽  
Vol 11 (33) ◽  
pp. 20507-20518
Author(s):  
Petr Panuška ◽  
Zuzana Nejedlá ◽  
Jiří Smejkal ◽  
Petr Aubrecht ◽  
Michaela Liegertová ◽  
...  
Keyword(s):  
3D Printing ◽  
Toxicity Testing ◽  
Toxicity Screening ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Fish Embryos ◽  
3D Printed ◽  
Novel Design

A novel design of 3D printed zebrafish millifluidic system for embryonic long-term cultivation and toxicity screening has been developed. The chip unit provides 24 cultivation chambers and a selective individual embryo removal functionality.

A novel design of printable tunable stiffness metamaterial for bone healing

2021 ◽  
Vol 116 ◽  
pp. 104345
Author(s):  
Mohammad Saber Hashemi ◽  
Aaron McCrary ◽  
Karl H. Kraus ◽  
Azadeh Sheidaei
Keyword(s):  
Bone Healing ◽  
Tunable Stiffness ◽  
Novel Design

scholarly journals Tablet fragmentation without a disintegrant: A novel design approach for accelerating disintegration and drug release from 3D printed cellulosic tablets

2018 ◽  
Vol 118 ◽  
pp. 191-199 ◽  
Author(s):  
Basel Arafat ◽  
Magdalena Wojsz ◽  
Abdullah Isreb ◽  
Robert T. Forbes ◽  
Mohammad Isreb ◽  
...  
Keyword(s):  
Drug Release ◽  
Design Approach ◽  
3D Printed ◽  
Novel Design

Calculation and Measurement of the Stiffness and Damping Coefficients for a Low Impedance Hydrodynamic Bearing

1997 ◽  
Vol 119 (1) ◽  
pp. 57-63 ◽  
Author(s):  
M. J. Goodwin ◽  
P. J. Ogrodnik ◽  
M. P. Roach ◽  
Y. Fang
Keyword(s):  
Experimental Data ◽  
Dynamic Stiffness ◽  
Perturbation Technique ◽  
The Novel ◽  
Oil Film ◽  
Hydrodynamic Bearing ◽  
Damping Coefficients ◽  
Stiffness And Damping ◽  
Film Stiffness ◽  
Novel Design

This paper describes a combined theoretical and experimental investigation of the eight oil film stiffness and damping coefficients for a novel low impedance hydrodynamic bearing. The novel design incorporates a recess in the bearing surface which is connected to a standard commercial gas bag accumulator; this arrangement reduces the oil film dynamic stiffness and leads to improved machine response and stability. A finite difference method was used to solve Reynolds equation and yield the pressure distribution in the bearing oil film. Integration of the pressure profile then enabled the fluid film forces to be evaluated. A perturbation technique was used to determine the dynamic pressure components, and hence to determine the eight oil film stiffness and damping coefficients. Experimental data was obtained from a laboratory test rig in which a test bearing, floating on a rotating shaft, was excited by a multi-frequency force signal. Measurements of the resulting relative movement between bearing and journal enabled the oil film coefficients to be measured. The results of the work show good agreement between theoretical and experimental data, and indicate that the oil film impedance of the novel design is considerably lower than that of a conventional bearing.

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