scholarly journals Design of Customized TPU Lattice Structures for Additive Manufacturing: Influence on the Functional Properties in Elastic Products

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4341
Author(s):  
Sergio de la Rosa ◽  
Pedro F. Mayuet ◽  
José Ramón Méndez Salgueiro ◽  
Lucía Rodríguez-Parada
Keyword(s):  
Lattice Structure ◽  
Reaction Force ◽  
Statistical Treatment ◽  
Lattice Structures ◽  
Compression Process ◽  
Element Simulation ◽  
Relationship Of ◽  
The Relationship ◽  
Manufacturing Parameters ◽  
Elastic Lattice

This work focuses on evaluating and establishing the relationship of the influence of geometrical and manufacturing parameters in stiffness of additively manufactured TPU lattice structures. The contribution of this work resides in the creation of a methodology that focuses on characterizing the behavior of elastic lattice structures. Likewise, resides in the possibility of using the statistical treatment of results as a guide to find favorable possibilities within the range of parameters studied and to predict the behavior of the structures. In order to characterize their behavior, different types of specimens were designed and tested by finite element simulation of a compression process using Computer Aided Engineering (CAE) tools. The tests showed that the stiffness depends on the topology of the cells of the lattice structure. For structures with different cell topologies, it has been possible to obtain an increase in the reaction force against compression from 24.7 N to 397 N for the same manufacturing conditions. It was shown that other parameters with a defined influence on the stiffness of the structure were the temperature and the unit size of the cells, all due to the development of fusion mechanisms and the variation in the volume of material used, respectively.

Association of Step Width with Accelerated Sprinting Performance and Ground Reaction Force

2017 ◽  
Vol 38 (07) ◽  
pp. 534-540 ◽  
Author(s):  
Ryu Nagahara ◽  
Mirai Mizutani ◽  
Akifumi Matsuo ◽  
Hiroaki Kanehisa ◽  
Tetsuo Fukunaga
Keyword(s):  
Reaction Force ◽  
Step Width ◽  
Male Athletes ◽  
Phase Profile ◽  
Body Velocity ◽  
Reaction Forces ◽  
Relationship Of ◽  
The Relationship ◽  
Calculated Average ◽  
Step Section

AbstractThis study aimed to describe changes in step width (SW) during accelerated sprinting, and to clarify the relationship of SW with sprinting performance and ground reaction forces. 17 male athletes performed maximal-effort 60 m sprints. The SW and other spatiotemporal variables, as well as ground reaction impulses, over a 52 m distance were calculated. Average values for each 4 steps during acceleration were calculated to examine relationships among variables in different sections. The SW rapidly decreased up to the 13th step and slightly afterward during accelerated sprinting, showing a bilinear phase profile. The ratio of SW to the stature was significantly correlated with running speed based on average values over the 52 m distance and in the 9th–12th step section during accelerated sprinting. The SW ratio positively correlated with medial, lateral and mediolateral impulses in all step sections, except for medial impulse in the 17th–20th step section. These results indicate the importance of wider SW for better sprinting performance, especially in the 9th–12th step section. Moreover, the wider SW was associated with larger medial impulse and smaller lateral impulse, suggesting that a wide SW contributes to the production of greater mediolateral body velocity during accelerated sprinting.

scholarly journals The Hamstring/Quadriceps Ratio in Young Men and Its Relationship with the Functional Symmetry of the Lower Limb in Young Men

Symmetry ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 2033
Author(s):  
Piotr Tabor ◽  
Dagmara Iwańska ◽  
Anna Mazurkiewicz ◽  
Czesław Urbanik ◽  
Andrzej Mastalerz
Keyword(s):  
Muscle Strength ◽  
Vertical Jump ◽  
Reaction Force ◽  
Young Men ◽  
Knee Joints ◽  
Vertical Ground Reaction Force ◽  
Functional Symmetry ◽  
Relationship Of ◽  
The Relationship ◽  
Knee Flexors

The relationship of muscle strength symmetry with the symmetry of dynamic activities such as vertical jump (CMJ) and with symmetry of ranges of motion is ambiguous. Therefore, the aim of the current investigation was to assess the relationship between the flexor/extensor strength ratio and the range of motion of the knee joints and VGRF during jump in a sample of young healthy men. The sample consisted of 64 healthy, active men. The flexor and extensor torques and ranges of active and passive mobility of both knee joints were measured. Vertical ground reaction force (VGRF) was measured using two platforms. There were no significant correlations between the symmetry of muscle strength and the symmetry of ranges of motion and the symmetry of the VGRF. Therefore, using the cluster analysis, 4 subgroups were distinguished due to the size of the flexor/extensor ratio (H/Q ratio). Significant differences were found in the level of strength of the knee flexors between the clusters. Detailed analysis of muscle strength symmetry and VGRF symmetry seem to confirm the Leading Joint Hypothesis theory of motion control in multi-joint systems. It was found that the process of controlling movement by the nervous system compensates for the small asymmetries in the level of muscle strength in the knee flexors and extensors, as well as small asymmetries of VGRF.

Structural Design and Performance Testing of SMPC Deployable Hinge

2019 ◽  
Vol 893 ◽  
pp. 104-108
Author(s):  
Bao Xian Jia ◽  
Wen Feng Bian ◽  
Ning Peng
Keyword(s):  
Shape Memory Polymer ◽  
Single Layer ◽  
Performance Testing ◽  
Bending Moment ◽  
Bending Angle ◽  
Element Simulation ◽  
And Performance ◽  
Relationship Of ◽  
Hinge Bending ◽  
The Relationship

SMPC (shape memory polymer composites) has many advantages as a hinge of spacedeployable antenna. The structure of the SMPC hinge is designed and tested in this paper. The basicmechanical properties of composites are calculated. Through finite element simulation, the bendingmoment of the positive and reverse of the lamella with the bending angle as the lamella with the fiberdifferent content, the bending of the lamella with different bending distances was simulated, and thecurves of bending moment with bending angle in different bending distances were obtained. Hingebending process simulation shows when the hinge begins to bend, the stress of the inner positivebending lamella is larger. The stress of the outside bending lamella increases with the increase of thebending angle. As for the relationship of moment-angle, the process of unfolding of the hinge isbasically the same as that of the lamellae. However, the hinge bending moment is much greater thanthe single layer lamella bending moment. The hinge with the structure of back-to-back can increasethe structure stiffness and the bending resilience ability. The tested moment of the hinge is similar tothe simulation result.

Study on Unbalanced Electromagnetic Force of Turbine-Generator Inter Turn Short Circuit and its Relevant Fault

2013 ◽  
Vol 427-429 ◽  
pp. 230-234
Author(s):  
Wen Jing Zhang ◽  
Yong Gang Li ◽  
Yu Ca Wu
Keyword(s):  
Finite Element ◽  
Fault Diagnosis ◽  
Electromagnetic Force ◽  
Short Circuit ◽  
Turbine Generator ◽  
Element Simulation ◽  
Rotor Winding ◽  
Relationship Of ◽  
Short Circuit Fault ◽  
The Relationship

Inter turn short circuit fault is very common for turbine-generator, which will produce unbalanced electromagnetic force (UEMF) together with its relevant fault, namely dynamic eccentric, on the rotor. After complete finite element simulation by ANSYS, The relationship of rotor winding short positions and short degrees with UEMF were studied. And then, only the dynamic eccentric fault occurs, the relations of dynamic eccentric angles and dynamic eccentric degrees with UEMF were discussed as well. Whats more, by comprehensive consideration of the two faults, the characteristic of the force and its change law were researched. This paper provides a viable path to study the vibration law and fault diagnosis of turbine-generator in multi-source stress.

PHENOMENOLOGICAL IMPLICATIONS OF HIGH-Tc SUPERCONDUCTIVITY

1992 ◽  
Vol 06 (14) ◽  
pp. 2499-2519 ◽  
Author(s):  
Y. L. MA ◽  
X. X. DAI
Keyword(s):  
Specific Heat ◽  
Lattice Structure ◽  
Equations Of Motion ◽  
Mean Field ◽  
Soliton Solutions ◽  
Real Space ◽  
Field Equations ◽  
Critical Magnetic Fields ◽  
Relationship Of ◽  
The Relationship

We develop a phenomenological model for high-T c superconductors. Some main features are emerging in copper oxides: characteristic quasi two-dimensional Cu-O planes, strong correlation of antiferromagnetism, existence of a vortex lattice structure, and observation of a small coherence length and a large penetration depth. These features indicate that the superconductive pair is reasonably constrained to a small volume in real space and may be conceived of as a string-carrying vortex, and therefore can be well simulated by the dual phenomenological local boson fields [Formula: see text] and Φ. The various mean-field ground states of the system are discussed. The field equations of motion are originally solved to get approximate analytical soliton solutions. The effective Hamiltonian is formulated by a variational method for finite temperatures. The model parameter behaviour described by the relationship of the variational parameters is investigated. We discuss the critical temperature T c , the specific heat cV and its jump Δc at T c , and the critical magnetic fields H c1 and H c2 . These results are in agreement with experimental observations, especially the critical behaviours and the zero temperature values. The model also allows interpretation of the variation of T c with oxygen vacancy x and that with doping fraction δ in Cu-O planes, as well as the dependence of γ (defined as the specific heat coefficient of the T-linear term) on δ.

scholarly journals The relationship of professional goals and the readiness in acquiring foreign language among advertising students: basis for foreign language training

2020 ◽  
Vol 2 (1) ◽  
pp. 01
Author(s):  
Jerielyn V. Reyes
Keyword(s):  
Foreign Language ◽  
Teaching Method ◽  
Native Language ◽  
Statistical Treatment ◽  
Data Gathering ◽  
The Philippines ◽  
Language Training ◽  
Professional Goals ◽  
Relationship Of ◽  
The Relationship

The present study aims to determine the relationship of professional goals and readiness of advertising students in learning foreign language to be the basis for foreign language training.  This study also aims to identify the preferred teaching method for studying foreign language and the ASEAN native language that they are interested to learn. The descriptive research involved 157 first year advertising students from the Polytechnic University of the Philippines through a survey.  After the data gathering and statistical treatment of data, it was found out that the respondents’ aspiration falls on material security and their multicultural aspiration is towards deeper understanding on other people.  The respondents expressed the readiness to learn foreign language to better understand the values, ideals, and assumption in life of their foreign counterparts.  Grammar translation approach was preferred for learning the language and the most preferred ASEAN native language are Mandarin, Chinese, Thai, and Bahasa Indonesia.

scholarly journals Design and Dynamic Equivalent Modeling of Double-Layer Hoop Deployable Antenna

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Hongwei Guo ◽  
Chuang Shi ◽  
Meng Li ◽  
Zongquan Deng ◽  
Rongqiang Liu
Keyword(s):  
Double Layer ◽  
Strain Energy ◽  
Structural Characteristics ◽  
Equivalent Model ◽  
Material Parameters ◽  
Modal Test ◽  
Element Simulation ◽  
Energy Equivalence ◽  
Relationship Of ◽  
The Relationship

This study proposes deployable units driven by elastic hinges and a double-layer hoop deployable antenna composed of these units. A rational modeling method based on the energy equivalence principle is presented to develop an equivalent model of the double-layer hoop antenna in accordance with the structural characteristics of the antenna. The equivalent beam models of the rods with elastic hinges are proposed. The relationship of geometrical and material parameters is established considering the strain energy and the kinetic energy of the periodic unit, which are the same as those of the equivalent beam in the same displacement field. The equivalent model of the antenna is obtained by assembling several equivalent beam models in the circumferential direction. The precision of the equivalent model of the antenna is acceptable as found by comparing the modal analysis results obtained through equivalent model calculation, finite element simulation, and modal test.

scholarly journals CORRELATION OF SOCIAL DEPRIVATION ON THE MENTAL HEALTH AMONG THE CLUSTER 7 TEACHERS IN CALAMBA CITY, LAGUNA, SCHOOL YEAR 2020-2021

2021 ◽  
pp. 202-211
Author(s):  
Mart Albert A. De Guzman
Keyword(s):  
Mental Health ◽  
Standard Deviation ◽  
Online Survey ◽  
Social Deprivation ◽  
Statistical Treatment ◽  
Self Esteem ◽  
Weighted Mean ◽  
State Of Mind ◽  
Relationship Of ◽  
The Relationship

This study aimed to analyze the relationship of social deprivation on the mental health among the Cluster 7 teachers in Calamba City, Laguna. Specifically, this study sought to answer the following questions: (1) Level of social deprivation on the mental health among the Cluster 7 teachers in Calamba City Laguna in terms of Social Isolation and Interpersonal Communication. (2) Level of mental health of Cluster 7 teachers in Calamba City, Laguna in terms of State of mind, Behavior, Thinking, and Self-Esteem. (3) Is there a significant relationship between social deprivation and the mental health among the Cluster 7 Teachers in Calamba City, Laguna? The descriptive method of research design was used in this study to arrive at more conclusive proof and primarily to analyze the data systematically. The online questionnaire checklist which is composed of thirty (30) questions, where five (5) question for social interaction, five (5) question for personal communication, five (5) question for state of mind, five (5) for behavior, five (5) Thinking, five (5) self-esteem. The data collected was treated with the used of weighted mean level and standard deviation as basis for the statistical treatment of data to analyze the relationship of social deprivation on the mental health among the Cluster 7 teachers in Calamba City, Laguna. The weighted mean and standard deviation were computed by the average of the response in the self-made online survey. The Pearson-R for the correlated mean was used in order to find out the strength of the relationship between two variables and their association with each other are jointly significant especially on the correlation on social deprivation on the mental health among the Cluster 7 teachers in Calamba City, Laguna.

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