bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Multisensory Virtual Reality System for Astronauts’ Entertainment and Relaxation
Authors: Carulli Marina , Bordegoni Monica , Bernecich Francesca , Spadoni Elena , Bolzan Patrizia 
Published: November 2019

Abstract
A research area of interest is that one concerning the design of solutions for improving the life conditions of users in extreme environmental situations. An example is the spacecraft environment, where astronauts are subject to particular conditions, due to the extreme environment. The isolated and confined environment influences behaviors and perceptions. This situation can impact both on astronauts’ moods, cause states of depression, and impact on their performance in working activities. A spacecraft can be the Space Station orbiting the Earth, or future means of transportation used for travelling to other planets. In both cases the space should be designed so as to offer the best possible living and working conditions to the astronauts.
The research presented in this paper aims at designing and developing a multisensory VR system for the entertainment and the relaxation of astronauts. The use of VR technology allows us to overcome physical and psychological boundaries of the confined space, which is typical in a spacecraft environment. The sense of smell, which is more linked to visceral emotions than the other senses and can affect various aspects of humans’ physiological and psychological conditions, is used to improve astronauts’ productivity and concentration, and also to relieve their stress and anxiety.
Understanding the Design Neurocognition of Mechanical Engineers When Designing and Problem-Solving
Authors: Vieira Sonia , Gero John , Delmoral Jessica , Gattol Valentin , Fernandes Carlos , Parente Marco , Fernandes António 
Published: November 2019

Abstract
This paper presents results from an experiment to determine brain activation differences between problem-solving and designing of mechanical engineers. The study is part of a research project whose goal is to correlate design cognition with brain behavior across design domains. The study adopted and extended the tasks described in a fMRI study of design cognition and measured brain activation using EEG. By taking the advantage of EEG’s temporal resolution we focus on time-related neural responses during problem-solving compared to design tasks. Statistical analyses indicate increased activation when designing compared to problem-solving. Results of time-related neural responses connected to Brodmann areas cognitive functions, contribute to a better understanding of mechanical engineers’ cognition in open design tasks.
Mode Localization in Two Coupled Nearly Identical MEMS Cantilevers for Mass Sensing
Authors: Rabenimanana Toky , Walter Vincent , Kacem Najib , Le Moal Patrice , Bourbon Gilles , Lardiès Joseph 
Published: November 2019

Abstract
This paper investigates the mass sensing in a mode-localized sensor composed of two weakly coupled MEMS cantilevers with lengths 98μm and 100μm. The two resonators are connected by a coupling beam near the fixed end, and the shortest cantilever is electrostatically actuated with a combined AC-DC voltage. The DC actuation voltage is tuned to compensate the length difference and geometrical imperfections in order to dynamically equilibrate the system. An analytical model of the device using the Euler Bernoulli beam theory is presented and the required DC voltage to reach the balanced state is used. A mass perturbation is then added on the long cantilever and the eigenstate shifts and amplitude ratios in each mode are calculated for different couplings. Results show that the amplitude ratio of the second mode is the best output metric for the mass detection. For the validation of the model, an experimental investigation is carried out by using devices fabricated with the Multi-User MEMS Processes. Three different couplings are considered and the long cantilever is designed with a mass attached at its end. Instead of adding a mass on the device, we remove this part with a probe to introduce the perturbation. When the mass is removed, the experimental frequency responses of the device show localized vibrations, which are in good agreement with the theoretical results.
Acoustic Non-Reciprocal Band Structure in a Passive, Nonlinear, 1D Material
Authors: Fang Lezheng , Darabi Amir , Vakakis Alexander F. , Leamy Michael J. 
Published: November 2019

Abstract
Acoustic non-reciprocity, referring to the phenomenon of path-dependent propagation, has diverse applications in mechanical devices. This paper presents a numerical study on a periodic triangle-shape structure that breaks reciprocity in a passive manner over a broad range of frequency and energy. The proposed structure contains strong nonlinearity and geometric asymmetry, which contributes to a direction-dependent dispersion relationship. When the signal frequency falls in the band pass in one direction, and band gap in the other, a unidirectional wave propagation results. The system achieves giant non-reciprocity with minimal distortion in the frequency content of the signal.
A Parametric Modeling Approach for Prediction of Load Distribution due to Fluid Structure Interaction on Aircraft Structures
Authors: Barutcu Ahmet , Gorguluarslan Recep M. 
Published: November 2019

Abstract
The Fluid Structure Interaction (FSI) is a critical multi-physics phenomenon in the aerospace applications for computing loads. Including the FSI effects on the analysis requires high computational cost. A computationally efficient framework is presented in this study for predicting the FSI effects. The high-fidelity structural model is reduced on the elastic axis by using an efficient structural idealization technique. A parametric model generation process is developed by using Bezier surface control vertices (CVs) to estimate the changing load distribution under deformation. The aircraft wing outer surface is created by using Bezier surface modeling method for this purpose. The CVs of the surfaces are perturbed to predict the effect of the deformed shape on the load distribution. This method allows to predict the load distribution by using a few CVs instead of using all grid points. The Aerodynamic Influence Coefficients (AIC) matrix is generated based on the predicted loads based on this parametric modeling approach instead of conducting computationally expensive fluid flow analysis. The presented framework is implemented for an aircraft wing design to show its efficacy.
An Analytical Investigation of the Impact of Design Parameters on the Performance of Centrifugal Pendulum Vibration Absorbers
Authors: Sarikaya Bahadir , Inalpolat Murat , Lee Hyun Ku , Kim Moo Suk 
Published: November 2019

Abstract
A generalized nonlinear time-varying, planar dynamic model of bifilar centrifugal pendulum vibration absorbers (CPVA) is proposed. This dynamic model enables fast prediction of vibration reduction performance of any CPVA design considering the impact of absorber rollers, gravity, end stops and translational motion of the system. The modeling framework provides comparative, simultaneous simulation results for numerous different design possibilities, and thus can be used to optimize CPVA designs. The dynamic model is generic and can handle N individually designed absorbers on a rotor with numerous path options ranging from circular to cycloid. Absorbers can be designed to be equally or unequally spaced. In this study, first the dynamic model of the bifilar CPVAs is derived. Then, case studies are provided to showcase the capabilities of the modeling framework. Initially, maximum applicable dynamic torque to a CPVA and vibration reduction performance are investigated by considering the effect of tuning order and different absorber path options for different operating speeds. Then, impact of different modelling features on system frequency response and limit dynamic torque is investigated. Interactions between the important design parameters are highlighted. Finally, the influence of end stop positioning on the CPVA dynamic response is illustrated.
Construction of Multi-Domain System Simulation Model for Trade Studies in System Design Considering Multiple Scenes
Authors: Oizumi Kazuya , Ishida Keita , Uchibori Yoshihiro , Aoyama Kazuhiro 
Published: November 2019

Abstract
As a product is sold globally, usages of the product have much wider variety. Thus, a product needs to be designed considering multiple scenes. To certify that the product performs properly in any scene, industries started to apply Model Based Systems Engineering (MBSE). Whereas multi-domain system simulations are regarded as a prominent approach for the system design of a product, construction of model depends on knowledge and sense modelers. This paper proposes a modelling method to construct appropriate multi-domain system simulation models while reducing dependencies to senses of modelers. The proposed method comprises two parts. First, significant tradeoffs to be studied by the simulation are specified. Second, features of simulation models are deliberated for specified tradeoffs. To specify significant tradeoffs, product and scenes where the product is used are integrated into a model. Further, to deliberate features of simulation model, cognitive model of physical phenomena in a product is employed as well. The proposed method was applied to the development of continuously variable transmission to verify its validity.
Kirigami-Based Deployable Transcrease Hard Stop Models Usable in Origami Patterns
Authors: Andrews David W. , Avila Alex , Butler Jared , Magleby Spencer P. , Howell Larry L. 
Published: November 2019

Abstract
Stopping origami in arbitrary fold states can present a challenge for origami-based design. In this paper two categories of kirigami-based models are presented for stopping the fold motion of individual creases using deployable hard stops. These models are transcrease (across a crease) and deploy from a flat sheet. The first category is planar and has behavior similar to a four-bar linkage. The second category is spherical and behaves like a degree-4 origami vertex. These models are based on the zero-thickness assumption of paper and can be applied to origami patterns made from thin materials, limiting the motion of the base origami pattern through self-interference within the original facets. Model parameters are based on a desired fold or dihedral angle, as well as facet dimensions. Examples show model benefits and limitations.
Predicting Finite Element Submodel Boundary Conditions for Contact Models Using Richardson Extrapolation
Authors: Sracic Michael W. , Elke William J. 
Published: November 2019

Abstract
This paper considers an efficient way to apply submodeling methods to finite element models using Richardson Extrapolation. A problem is considered where a rigid cylindrical indenter contacts an elastic half plane (RCEHP). A submodeling method is introduced where the errors of the displacements on the boundaries of the submodel are controlled by employing a best-fit Richardson Extrapolation curve. Specifically, the curve is fit to the convergence relationship of various estimates of submodel boundary displacements. The method is tested on the RCEHP problem, and the results of the model predictions for maximum contact pressure are compared to an analytical and converged global model result.
The submodeling method predicted the maximum contact pressure of the RCEHP contact interface to be about 7% higher than the analytical prediction and 5% higher than the converged global model prediction. The error is likely due to the selection of the global and submodel domains, the numerical algorithm used to estimate the Richardson Extrapolation Curve Fits, and the mesh refinements used for the various models. The proposed method solved in about 42.6 minutes while the converged global model solved in 11.19 hours. Future work will aim to provide best practices to reduce error and maximize computational time savings when using the method.
Reverse Engineering and Optimization of a Steering Mechanism Component in a Competition Ground Vehicle
Authors: López-Pachón Matheo , Gonzalez-Cárdenas Diego , Gonzalez-Mancera Andres 
Published: November 2019

Abstract
In this paper, reverse engineering of a steering system component in a competition vehicle was successfully carried out. A CAD model was generated by means of NURBS curves from 3D scanning. Additionally, two manufacturing methods were compared to obtain the component namely, CNC and Casting. Simultaneously, a topological optimization was carried out from the failure diagnosis of the part; hence, to determine the failure, different loads were simulated in a transient and elastoplastic FEM simulation using an isotropic bilinear hardening model, in order to detect the displacement of a faulty component. The methodology implemented in the study showed satisfactory results for the different stages of the process.
A Lower Pad Adjustable Bearing Reducing Vibration Response of Rotor Systems During Acceleration
Authors: Zhang Lei , Xu Hua , Zhang Shenglun , Pei Shiyuan 
Published: November 2019

Abstract
A lower pad movable bearing is proposed which has the ability to change the lubricating performance of the journal bearing. The structure and working principle of the adjustable bearing are introduced. This bearing can adjust the working status of the rotor system by changing the position of the bearing pad and reduces the vibration amplitude of rotor. In this paper, a simple rotor bearing finite element model is used to study the vibration response of the rotor system. Through research, it is found that larger ellipticity can effectively reduce the amplitude of the rotor when the rotor speed is running at a certain speed away from the critical speed, and the vibration suppression effect can reach 67%. When the rotor passes the critical speed, reducing the ellipticity can significantly reduce the resonance amplitude of the rotor, and the vibration suppression effect reaches about 37%. In addition, when the rotational speed increases to twice the critical speed, the oil film oscillation occurs under light load condition, which can be suppressed by reducing the ellipticity. Adjustable bearing can then be proposed to adaptively improve the vibration of the rotor system based on the rotor speeds.
Bayesian Optimization of Equilibrium States in Elastomeric Beams
Authors: Yoo David , Wiley Carson , Gillman Andrew , Chen Vincent , Juhl Abigail , Buskohl Philip 
Published: November 2019

Abstract
Architected elastomers have demonstrated great potential for energy absorption, multi-resonant vibration isolation, and multi-bandgap acoustic control, due to the reversibility and programmability of their mechanical instabilities. However, computational design tools are needed to explore the large parameter space that regulates buckling-based mechanical instability behavior. In this study, we develop a machine-learning-based design optimization framework to control equilibrium states of a bistable elastomeric beam, while also regulating the required energy to transition between these configurations. Leveraging symmetry to reduce the design space, the research is performed on a single element, an inclined, slender beam, through a Fourier series parameterization. To evaluate the force-displacement response of the bistable beam, a nonlinear finite element analysis (FEA) with an arc-length continuation method is employed in a commercial FEA tool. Due to the highly non-convex bistability response of the beam in this proposed design space and the computational cost of the FEA analysis, a Bayesian optimization is implemented to promote a better trade-off between the number of function evaluations and rate of convergence. Bayesian optimization depends on several optimization parameters, which are systematically tuned in this study to characterize their role on the optimization process. With the proposed method, the equilibrium displacement and the ratio of output to input energy between stable states can be optimized within a few tens of iterations. A multi-objective optimization is also carried out to study the trade-off between equilibrium position and the energetics to transition between the bistabilities.
Experimental Study on Folding Patterns and Deployability of Inflatable Structures
Authors: Ishida Sachiko , Azuri Hakimi 
Published: November 2019

Abstract
In this study, the authors experimentally investigate the relationship between folding patterns and performances of inflatable structures; compactness and deployability. Inflatable structures are widely applied in various engineering fields such as airbags in automobile industry, inflatable building in architectural field, and inflatable satellite antenna and landing equipment to Mars in space engineering field. However, these two requirements can be a tradeoff, as a compact product is hard to deploy in general. As a possible solution, circular spiral patterns are adopted in this study, because 1) they can be simultaneously deployed along spiral fold lines that is an advantage on deployability, and 2) the removal of the core of the circular sheet can make the sheet folded more compactly that is an advantage on compactness. Inflation models with different design parameters are created and tested. As experimental results, the inflation time (i. e. deployablity) and the initial width (i. e. compactness) can be optimized simultaneously in terms of four design parameters, but a trade-off relationship is observed in terms of the rest parameter; the folding angle formed by the V-shaped fold lines.
On the Unfolding Process of Triangular Resch Patterns: A Finite Particle Method Investigation
Authors: Yu Ying , Chen Yan , Paulino Glaucio H. 
Published: November 2019

Abstract
Many numerical approaches have been proposed to simulate the folding process of origami pattern under external force or displacement. Based on the Finite Particle Method (FPM), this paper develops a method to simulate the unfolding process of the Origami Pattern named triangular Resch Pattern by the energy stored in the crease. The formulations of the FPM for particle-bar-hinge models are derived. A simple fold origami example is given to verify the proposed formulations. Finally, the unfolding process of the triangular Resch pattern is simulated, and the symmetry properties of the triangular Resch pattern are obtained. The symmetry properties of this pattern have potential use in the degree-of-freedom reduction and motion control.
Calibration of Reconfigurable Stewart-Gough Platform for Mobile Machining Application
Authors: Hansen Andreas Bennekov , Laursen Jørgen Møberg , Henriksen Sebastian Theis , Ringgaard Kasper , Rydahl-Haastrup Morten , Balling Ole 
Published: November 2019

Abstract
This paper considers the problem of calibrating a reconfigurable Stewart-Gough platform for mobile machining applications using partial information measurements. The motivation for the work comes from the wind turbine industry, where cost reduction for machining of large components is desired. In the paper kinematic description of an actual prototype machine, together with description of partial information calibration methods of which simulated and experimental results are shown.
Results of the proposed calibration methods, where only positional data of the machine was measured by a laser tracker, showed great improvement of the machine performance. Results from experiments showed achievable positioning tolerances of maximum 65μm after an initial factory calibration, and 146μm for a secondary calibration, where fewer parameters were included to reduce lost machining time during configuration change. Machining tests furthermore indicated that it is possible to continue machining across different configurations.
Kinetic Energy Recovery System for Urban Mobility
Authors: Vignati Michele , Barzaghi Simone , Tarsitano Davide , Braghin Francesco 
Published: November 2019

Abstract
The aim of this work is to discuss the possibility to store energy on board electric vehicles by means of flywheels as alternative to common batteries. A detailed optimization of the power storage system for the mini-car Icar0 ZD-1 with a target autonomy of 50 km in urban context is carried out. A preliminary designed is then made considering the power consumption in urban context accounting for the full power-train energetic model. Material, geometry and motor have been selected to fit all the vehicle space requirements considering also that flywheels operate in vacuum environment. In particular, attention is focused on some critical aspects like the effect of vibrations transmitted to the flywheel. For this reason, induced gyroscopic effects are considered both in straight and during turns. Finally, a possible bearing configuration is presented.
Towards Consistent Value Orientation in Release Planning
Authors: Şahin Tarık , Inkermann David , Vietor Thomas 
Published: November 2019

Abstract
Product development is experiencing a paradigm shift under the impact of highly segmented and rapidly evolving markets. The intention to offer successful products in such turbulent conditions forces companies to provide value comprehensively but rapidly. These attempts conceal a high risk of rising product complexities and development efforts. For this reason, the aim of design should be to maintain or improve value contribution according to customer and market demands with fast response time while reducing internal product disruption and development efforts. A proactive planning of continuous value contribution by introducing new product features, while considering the complexity of product structures and corresponding development efforts, is established in the field of release planning. Here, systematic ways are proposed to support the identification and timing of product features to provide value for customers and markets as well as the consideration and planning of according efforts for their realization. However, the literature highlights a need for more consistent value orientation in release planning. For this reason, this contribution aims to present an outline and further steps for consistent value orientation in release planning in the context of systems engineering. Accordingly, this contribution first discusses the significance of consistent value orientation during release planning activities. On this basis, requirements for consistent value orientation in release planning are presented and the respective current state of existing concepts are discussed. Ultimately, a framework towards consistent value orientation in release planning is presented with a concluding outlook for further research.