Design and study of the action of the yarn-pulling mechanism of a carbon-fiber one-sided stitching device based on improved technology

2019 ◽  
Vol 90 (11-12) ◽  
pp. 1372-1384
Author(s):  
Jiuzhi Dong ◽  
Lingchao Ji ◽  
Xin La ◽  
Jingzhao Yang ◽  
Yunjun Chen
Keyword(s):  
Mathematical Model ◽  
Carbon Fiber ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Carbon Composites ◽  
Test Results ◽  
Trajectory Simulation ◽  
Crank Angle ◽  
Relationship Of ◽  
Improved Technology

To realize a one-sided stitching action and stable stitch formation, a poor match between the lead and the hook yarn needles in the stitching process must be avoided as it can lead to hook dropping and hook errors, causing loop loss, thread breaking, and even thread relaxing. Based on an analysis of the principle of one-sided stitching and matching the hook and lead yarn needles, the original stitching technology is improved and a method of trajectory superposition is proposed. A yarn-pulling mechanism is designed for a one-sided stitching device for three-dimensional preformed carbon/carbon composites. By analyzing the principle of the yarn-pulling mechanism, a mathematical model of that mechanism is established, and a trajectory simulation analysis is carried out with MATLAB, which verifies the rationality of the yarn-pulling principle. Results for the two crank angles of the yarn-pulling mechanism and the crank angle of the hook yarn needle at two particular moments reflect the matching relationship of the three, which provides a theoretical reference for the stitching device to adjust to and work well, forming the desired stitch. Finally, stitching tests are carried out, and the test results show the designed yarn-pulling mechanism can cooperate with the hook and the lead yarn needles to complete the stitch lock. This realizes a stable stitching action and avoids hook dropping and hook errors, thereby increasing stitching efficiency.

Simulation Analysis of the Working Process of the Corn Seed Metering Device with Combination Inner-Cell

2012 ◽  
Vol 215-216 ◽  
pp. 160-167 ◽  
Author(s):  
Qing Long Li ◽  
Ji Yang Yu ◽  
Qiang Qiang Zhang ◽  
Jian Qun Yu ◽  
Hong Fu
Keyword(s):  
Simulation Analysis ◽  
Three Dimensional ◽  
Bench Test ◽  
Particle Model ◽  
Test Results ◽  
Working Process ◽  
Corn Seed ◽  
3D Cad ◽  
Novel Method ◽  
Seed Metering Device

A three-dimensional discrete element method analytic model of the corn seed metering device with combination inner-cell was established based on its 3D CAD model, and the three-dimensional particle model of corn seeds was built by using the method of combination spherical particle. The working process of the corn seed metering device was simulated and analyzed by self-developed three-dimensional CAE software. It was observed that the simulative results of the seeding performance, clearing angles and dropping angles of the corn seeds well agreed with the bench test results. A novel method for studying and designing of the corn seed metering device was put forward.

Modeling and Simulation Analysis of the Twist Drill Conical Grinding Method Based on Pro/E Software

2010 ◽  
Vol 160-162 ◽  
pp. 1680-1684
Author(s):  
Xing Jun Gao ◽  
Qing Liu ◽  
Ping Zou ◽  
Jian Song ◽  
Ping Li
Keyword(s):  
Mathematical Model ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Fundamental Principle ◽  
Drilling Process ◽  
Twist Drill ◽  
Three Dimensional Modeling ◽  
Grinding Method ◽  
Dimensional Modeling ◽  
The Mathematical Model

The fundamental principle of the twist drill conical grinding method was introduced. The mathematical model of the twist drill was established. Mathematical model to establish drill bit is the geometric design, manufacture, cutting analysis and modeling on the basis of the drilling process. According to the twist drill grinding principle, using Pro/E the three-dimensional modeling of the twist drill was completed, and the feature of the conical grinding method was analyzed.

Numerical Simulation of UHPFRC-NSC Composite Beam with Diana

2011 ◽  
Vol 243-249 ◽  
pp. 6040-6043
Author(s):  
Yi Hong Guo ◽  
Gang Ling Hou ◽  
Nan Guo
Keyword(s):  
Numerical Simulation ◽  
Material Properties ◽  
Composite Beam ◽  
Shear Force ◽  
Three Dimensional ◽  
Crack Model ◽  
Test Results ◽  
Shear Connection ◽  
Relationship Of ◽  
Push Out

This paper presents three-dimensional numerical simulation of UHPFRC-NSC composite beam with Diana. An elastic-plastic fracture model is proposed to describe material properties of UHPFRC. Differing from other concrete constitutive model, this one considers strain hardening in tension because of characteristic of UHPFRC. A total strain rotating crack model is used to describe material properties of NSC. The results of relevant push-out tests are used to describe the shear force-slip relationship of shear connection between UHPFRC girder and NSC slab. The numerical investigation focuses on the evaluation of load-deflection behavior, failure mode and shear connection. The agreement of test results and numerical results indicates the reliability of model.

Ultrasonic Grinding Three-Dimensional Trajectory Simulation and Experimental Study

2011 ◽  
Vol 189-193 ◽  
pp. 4103-4107
Author(s):  
Bo Zhao ◽  
Jun Jin Ma ◽  
Ping Yan Bian ◽  
Yu Li
Keyword(s):  
Experimental Study ◽  
Ultrasonic Vibration ◽  
Surface Texture ◽  
Three Dimensional ◽  
Surface States ◽  
Trajectory Simulation ◽  
Ultrasonic Grinding ◽  
Relationship Of ◽  
Grinding Efficiency ◽  
The Relationship

In this paper the relationship of the efficiency of ultrasonic grinding and abrasive movement are studied. Ultrasonic grinding grain three-dimensional trajectories were simulated based on MATLAB software in the paper, and micro-grinding surface states were observed with SEM. Therefore, the influence law of ultrasonic vibration to the grinding surface texture is received. The results show that: Compared with ordinary grinding, the workpiece grinding surface texture quality and the grinding efficiency have been significantly improved under the condition of ultrasonic vibration.

scholarly journals Experimental studies on in-plane performance of plasterboard sheathed ceiling diaphragms

2019 ◽  
Vol 52 (2) ◽  
pp. 95-106
Author(s):  
Angela Liu ◽  
Minghao Li ◽  
Roger Shelton
Keyword(s):  
Mathematical Model ◽  
Residential Buildings ◽  
Experimental Studies ◽  
Three Dimensional ◽  
Test Results ◽  
Floor Plan ◽  
Damage Survey ◽  
Torsional Response ◽  
Seismic Engineering ◽  
The World

The ultimate goal of this study is to develop a model representing the in-plane behaviour of plasterboard ceiling diaphragms, as part of the efforts towards performance-based seismic engineering of low-rise light timber-framed (LTF) residential buildings in New Zealand (NZ). LTF residential buildings in NZ are constructed according to a prescriptive standard – NZS 3604 Timber-framed buildings [1]. With regards to seismic resisting systems, LTF buildings constructed to NZS3604 often have irregular bracing arrangements within a floor plan. A damage survey of LTF buildings after the Canterbury earthquake revealed that structural irregularity (irregular bracing arrangement within a plan) significantly exacerbated the earthquake damage to LTF buildings. When a building has irregular bracing arrangements, the building will have not only translational deflections but also a torsional response in earthquakes. How effectively the induced torsion can be resolved depends on the stiffness of the floors/roof diaphragms. Ceiling and floor diaphragms in LTF buildings in NZ have different construction details from the rest of the world and there appears to be no information available on timber diaphragms typical of NZ practice. This paper presents experimental studies undertaken on plasterboard ceiling diaphragms as typical of NZ residential practice. Based on the test results, a mathematical model simulating the in-plane stiffness of plasterboard ceiling diaphragms was developed, and the developed model has a similar format to that of plasterboard bracing wall elements presented in an accompany paper by Liu [2]. With these two models, three-dimensional non-linear push-over studies of LTF buildings can be undertaken to calculate seismic performance of irregular LTF buildings.

Simulation Analysis on Hydrostatic Transmission Based on the MATLAB/SIMULINK

2014 ◽  
Vol 1037 ◽  
pp. 212-215
Author(s):  
Zhen Zhu ◽  
Xiang Gao ◽  
Dao Yuan Pan ◽  
Yu Zhu
Keyword(s):  
Mathematical Model ◽  
Absolute Stability ◽  
Simulation Analysis ◽  
Response Characteristic ◽  
Driving Mechanism ◽  
Hydrostatic Transmission ◽  
Simulation Results ◽  
Relationship Of ◽  
The Mathematical Model ◽  
Characteristic Relationship

This paper explains the basic principle of hydrostatic transmission. The mathematical model of proportional driving mechanism and pump control motor mechanism has been established. According to the simulation results, the response characteristic relationship of system can be obtained,and analyses the controllability,the observability, the absolute stability and relative stability of the system,in order to illustrate the system is in conformity with the requirements of design.

The Ventilation and Thermal Performance of the Patio Space in Shanghai Shikumen House

2013 ◽  
Vol 742 ◽  
pp. 8-12
Author(s):  
Xiao Yu Luo ◽  
Jian Ge ◽  
Yi Cai
Keyword(s):  
Mathematical Model ◽  
Thermal Performance ◽  
Simulation Analysis ◽  
Thermal Environment ◽  
Three Dimensional ◽  
Simulation Software ◽  
Wind Environment ◽  
Residential Architecture ◽  
Dimensional Simulation ◽  
The Mathematical Model

Shanghai Shikumen house is a typical one of Chinese traditional residential architecture, which has a "two patios & one corridor" pattern adapting to the climate of Shanghai. In existing researches, most study of the thermal performance dwelling with courtyard is still qualitative. This research constructed the quantitative simulation of the " two patios & one corridor" pattern in Shanghai Shikumen house based on the mathematical model by the technical simulation software, and compared the above mode with the general courtyard house to test the advances of it. First of all, the research conduct a three-dimensional simulation analysis on the "two patios & one corridor" pattern and the general "Two patios" pattern. Then we compared the results of the wind environment of the two modes and found the "two patios & one corridor" mode has advances on ventilation. Secondly, we did thermal environment simulations of the rooms in the above two modes, and compared the analysis results of two modes. We found that the "two patios & one corridor" pattern did better in the room thermal. Finally, we hope this research can provide certain reference for the design of the sustainable residential architecture.

Study on the Influence of Air Resistance on the Mechanical Structure Based on the Theory of Elastic-Plastic Mechanics

2014 ◽  
Vol 543-547 ◽  
pp. 80-84
Author(s):  
Yan Xia Ji ◽  
Hai Sheng Song ◽  
Zhe Jian Liu ◽  
Bin Gao
Keyword(s):  
Mathematical Model ◽  
Computer Simulation ◽  
Three Dimensional ◽  
Computer Simulation Model ◽  
Ansys Software ◽  
Element Analysis ◽  
Mechanical Structure ◽  
Elastic Plastic ◽  
Air Resistance ◽  
Relationship Of

This paper establishes two-dimensional mathematical model and three-dimensional mathematical model of the mechanical structure elastic-plastic mechanics and according to Hooke's law and Drucker postulate analyzes the plastic relationship of the elastic-plastic mechanics. The first part of the paper introduces the parameter setting of finite element analysis of elastic-plastic mechanics. The second part establishes computer simulation model of elastoplastic. Finally, it analyzes bolt force using ANSYS software and applies it to computer simulation of elastoplastic force and air resistance of gymnast in the process of action showing which provides technical reference for the training of gymnasts.

scholarly journals Simulation Analysis and Experimental Study on Strength Optimization of a Plug-In Oil Hose Joint

2018 ◽  
Vol 2018 ◽  
pp. 1-22
Author(s):  
Chang Chen ◽  
Jikun Guo ◽  
Shifu Zhang ◽  
Qixin Zhang ◽  
Dongmei Zhang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Field Experiments ◽  
Simulation Analysis ◽  
Structural Characteristics ◽  
Geometric Model ◽  
Three Dimensional ◽  
Strength Test ◽  
Test Results ◽  
Tensile Strength Test ◽  
Oil Transportation

A plug-in oil hose joint is used as the research object in this study. Aimed at the problem of pipeline breakage due to insufficient strength of the joint during the process of oil transportation on the sea, a three-dimensional geometric model of the joint is constructed according to the structural characteristics of the plug-in joint. The mechanical properties of the plug-in hose joint were studied by numerical simulations and field experiments. The strength of the joint was optimized by applying materials with different properties and adjusting the circular angle of the joint. The tensile strength test results of the plug-in oil hose joint are consistent with the theoretical analysis, which shows that the method proposed in this paper can effectively improve the tensile strength of the oil hose joint. It is of great significance to expand the scope of the plug-in connector and ensure the safe and stable use of the hose system.

Problematic Internet Use digunakan Ketika Kesepian pada Remaja

2020 ◽  
Vol 14 (1) ◽  
pp. 45-60
Author(s):  
Yashinta Yashinta ◽  
Dwi Hurriyati
Keyword(s):  
Internet Use ◽  
Hypothesis Test ◽  
Problematic Internet Use ◽  
Coefficient Of Determination ◽  
Test Results ◽  
Research Subjects ◽  
Significance Level ◽  
Relationship Of ◽  
The Relationship ◽  
Effective Contribution

This study aims to determine the relationship of loneliness with problematic internet use on boarding students on Silaberanti street in Siantan jaya Opposite Ulu 1 Palembang city. Research subjects numbered 220 people using random sampling methods. Data was collected using a 60 item problematic internet use scale and a 60 item loneliness. Realibility is generated on scale of problematic internet use of 0,955 and loneliness of 0,946.Hypothesis testing uses product moment correlation analysis techniques. Hypothesis test results showed a positive relationshif between loneliness with problematic internet use on boarding students on Silaberanti street in Siantan jaya Opposite Ulu 1 Palembang city r= 0,684 with a significance level of 0,000 (p<0,01). Loneliness in this study made an effective contribution of 46,8% to problematic internet use which can be seen from the coefficient of determination (r²) that is equel to 0,468.

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