scholarly journals Validation of the modified digital element approach for simulating ballistic impact against fragment simulating projectile

2018 ◽  
Vol 175 ◽  
pp. 03057
Author(s):  
Ying Ma ◽  
Youqi Wang ◽  
Tiantian He
Keyword(s):  
Arbitrary Shape ◽  
Ballistic Impact ◽  
Calculation Algorithm ◽  
Penetration Process ◽  
Textile Fabrics ◽  
Contact Search ◽  
Element Approach ◽  
The Subject ◽  
Force Calculation ◽  
Textile Fabric

A modified digital element approach (DEA) is applied to simulate fabric perforation process under ballistic impact. The previous version of the DEA is capable of simulating ballistic impact of textile fabric using rigid body spherical and cylindrical projectiles only. Fragment simulating projectile (FSP) and real bullets are not modeled. The subject of this research is to perform ballistic penetration process against projectile of arbitrary shape and validate the modified DEA. A fabric to solid body projectile contact search and contact force calculation algorithm is established. Ballistic impact of textile fabrics against spherical and cylindrical projectiles is performed using the previous DEA and the modified DEA separately. Numerical results are compared to the well published DEA results to investigate the fabric bullet resistant performance.

Numerical study on the effects of yarn mechanical transverse properties on the ballistic impact behaviour of textile fabric

2012 ◽  
Vol 47 (7) ◽  
pp. 524-534 ◽  
Author(s):  
Cuong Ha-Minh ◽  
Abdellatif Imad ◽  
François Boussu ◽  
Toufik Kanit ◽  
David Crépin
Keyword(s):  
Numerical Study ◽  
Ballistic Impact ◽  
Impact Behaviour ◽  
Textile Fabric

Analytical Convolution Model of Cutting Forces in 3-D Ball End Milling

2001 ◽  
Author(s):  
Richard Y. Chiou ◽  
Bing Zhao
Keyword(s):  
Cutting Force ◽  
Frequency Domain ◽  
Cutting Forces ◽  
End Milling ◽  
Force Model ◽  
Three Dimensional Model ◽  
Calculation Algorithm ◽  
Ball End Milling ◽  
Convolution Model ◽  
Force Calculation

Abstract This paper presents an analytical convolution model of dynamic cutting forces in ball end milling of 3-D plane surfaces. The model takes into account the instantaneous slope on a sculptured surface to establish the chip geometry in cutting force calculation algorithm. A three-dimensional model of cutting forces in ball end milling is presented in terms of material properties, cutting parameters, machining configuration, and tool/work geometry. Based on the relationship of the local cutting force, chip load and engaged boundary, the total cutting force model is established via the angle domain convolution integration of the local forces in the feed, cross feed, axial direction, and inclination angle. The convolution integral leads to a periodic function of cutting forces in the angle domain and an explicit expression of the dynamic cutting force components in the frequency domain. Following the theoretical analysis, experimental study is discussed to illustrate the implementation procedure for force identification, and frequency domain data are presented to verify the analytical results.

A cross-modal tactile sensor design for measuring robotic grasping forces

2019 ◽  
Vol 46 (3) ◽  
pp. 337-344 ◽  
Author(s):  
Bin Fang ◽  
Hongxiang Xue ◽  
Fuchun Sun ◽  
Yiyong Yang ◽  
Renxiang Zhu
Keyword(s):  
Visual Information ◽  
Tactile Sensor ◽  
Circuit Board ◽  
Three Dimension ◽  
Robotic Grasping ◽  
Calculation Algorithm ◽  
Content Type ◽  
Grasping Forces ◽  
And Performance ◽  
Force Calculation

PurposeThe purpose of the paper is to present a novel cross-modal sensor whose tactile is computed by the visual information. The proposed sensor can measure the forces of robotic grasping.Design/methodology/approachThe proposed cross-modal tactile sensor consists of a transparent elastomer with markers, a camera, an LED circuit board and supporting structures. The model and performance of the elastomer are analyzed. Then marker recognition method is proposed to determine the movements of the marker on the surface, and the force calculation algorithm is presented to compute the three-dimension force.FindingsExperimental results demonstrate that the proposed tactile sensor can accurately measure robotic grasping forces.Originality/valueThe proposed cross-modal tactile sensor determines the robotic grasping forces by the images of markers. It can give more information of the force than traditional tactile sensors. Meanwhile, the proposed algorithms for forces calculation determine the superior results.

An Analysis of the Mechanical Forces in Latch Needle Cam Systems

1992 ◽  
Vol 206 (2) ◽  
pp. 129-137 ◽  
Author(s):  
B L MacCarthy ◽  
J M Sharp ◽  
N D Burns
Keyword(s):  
General Model ◽  
Textile Yarn ◽  
Basic Mechanism ◽  
Normal Operation ◽  
Mechanical Forces ◽  
Knitted Fabrics ◽  
Textile Fabrics ◽  
Cam Profile ◽  
Textile Fabric ◽  
Cam Systems

The majority of textile fabrics are either woven or knitted. Knitted fabrics are most frequently produced on weft knitting machines. The range of machinery is very diverse but the same basic mechanism is employed to convert textile yarn into knitted textile fabric. The mechanism is a specialized needle and cam system known as a latch needle cam system. This paper develops a general model for the mechanical forces that arise in normal operation of a latch needle cam system. The limitations of previous models are noted. The model may be used to predict mechanical forces for any specified cam profile and for the most common needle and cam arrangements. The model will be used in a following paper on yarn forces in latch needle cam systems. The performance of the model will be reported in a following paper describing an experimental programme and experimental results

A Finite Element Approach to Plate Vibration Problems

1965 ◽  
Vol 7 (1) ◽  
pp. 28-32 ◽  
Author(s):  
D. J. Dawe
Keyword(s):  
Finite Element ◽  
Arbitrary Shape ◽  
Natural Frequencies ◽  
Isotropic Plate ◽  
Uniform Thickness ◽  
Flat Plates ◽  
Finite Element Approach ◽  
Various Boundary Conditions ◽  
Element Approach ◽  
Vibration Problems

A method of computing the natural frequencies of vibration of flat plates of arbitrary shape is outlined in which the plate is considered as an assemblage of elements. Both stiffness and inertia matrices are derived for a rectangular isotropic plate element of uniform thickness, and these matrices are used to find the natural frequencies of square plates subject to various boundary conditions. Comparison of finite element frequencies with known exact, experimental and energy solutions shows the method to give good results even for relatively few elements.

A hierarchical O(N log N) force-calculation algorithm

Nature ◽  
1986 ◽  
Vol 324 (6096) ◽  
pp. 446-449 ◽  
Author(s):  
Josh Barnes ◽  
Piet Hut
Keyword(s):  
Calculation Algorithm ◽  
Force Calculation

scholarly journals Influence of Screen Printed Layers on the Thermal Conductivity of Textile Fabrics

2018 ◽  
Vol 26 (5(131)) ◽  
pp. 70-74
Author(s):  
Ilda Kazani ◽  
Ilda Kazani ◽  
Gilbert De Mey ◽  
Carla Hertleer ◽  
Lieva Van Langenhove ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Measuring Method ◽  
Conducting Layer ◽  
Metallic Materials ◽  
Textile Fabrics ◽  
Electric Conducting ◽  
Smart Textile ◽  
Thermographic Camera ◽  
Textile Fabric ◽  
Screen Printed

In the smart textile field the combination of textile and metallic materials is rising. In order to conduct electricity in textile, different methods are used. This paper deals with a new measuring method to determine the lateral thermal conductivity of a textile fabric. The technique starts by measuring the temperature distribution on the fabric using a thermographic camera. In addition to that, the method outlined in this paper will also allow to determine the change in thermal conductivity when an electric conducting layer has been screen printed on a textile fabric

scholarly journals GEOGRAPHICAL DISTRIBUTION OF FABRIC WEAVING IN ANATOLIAGEOGRAPHICAL DISTRIBUTION OF FABRIC WEAVING IN ANATOLIA

2021 ◽  
Vol 10 (78) ◽  
Keyword(s):  
Cultural Identity ◽  
Geographical Distribution ◽  
Random Sampling ◽  
Aegean Sea ◽  
Raw Material ◽  
Geographical Regions ◽  
The Subject ◽  
Different Characteristics ◽  
Textile Fabric ◽  
The Universe

In every era of its history, the art branches have varied a lot in different societies. One of these branches is fabric weaving from traditional textile arts. The fabric is densely produced and continues to be produced in every region where Turks live, representing different technical, motive and compositional characteristics. The fact that Anatolia is one of the important textile centers is one of the reasons for the substantiality of fabric weaving, and there are textile fabric types that are specific cultural identity elements in geographical regions. The aim of this study is compose the geographical distribution by determining the types and characteristics of traditional fabric weavings with different characteristics woven or continue to be woven in Anatolia. Survey research design was used in this study. The universe of this study is traditional fabrics woven in Anatolia, and the sample is 32 traditional handwoven fabrics selected by random sampling from 7 regions. To collect data, written sources related to the subject were examined. As a result of this study; although there are differences in appearance of the fabrics, it has been revealed that they are mostly produced on whipped looms and mostly using cotton yarn, but silk, wool, floss, linen, angora wool, bristle and flax It has also revealed that plain weave in the ground knitting, weft brocade technique in pattern knitting was used, being preferred the natural color of the raw material, geographical sign related to many traditional fabrics are taken and in geographically distribution was mostly the Aegean Sea & Black Sea. The other fabrics, which are our historical weaving heritage, also need to be registered and protected. New projects should be made to keep the our weavings alive which are living documents of our cultural identity. Keywords: Anatolia, fabric, woven, traditional hand weaving, geographical signs

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