Optimal Design of Triangle Fastening Screw Thread's Turn Number

2011 ◽  
Vol 314-316 ◽  
pp. 657-660
Author(s):  
Jian Min Chen ◽  
Meng Zhang ◽  
Jia Deng
Keyword(s):  
Optimal Design ◽  
Research Method ◽  
Equivalent Stress ◽  
Coupled Model ◽  
The Other ◽  
Screw Thread ◽  
Ansys Software ◽  
Axial Pressure ◽  
Maximum Equivalent Stress ◽  
Screw Threads

The paper firstly numerically simulates the coupled model of triangle fastening screw threads in the application of ANSYS software. Calculate stress intensity of the screw thread on the axial pressure of 200MPa. The fittest coupled turn number of the screw nut is designed to make sure the strength of coupled teeth and make every turn of the screw thread go on very well and also save material. The maximum equivalent stress of the screw thread changes linearly with the axial pressure. The stress of the thread's root is greater than that of the thread's top so that the root is easily damaged. The paper's research method can apply to the optimal design of the other patterns of screw thread's turn number.

An optimal design model for the wall thickness of the propellant tank

2019 ◽  
Vol 234 (2) ◽  
pp. 445-456
Author(s):  
Tengda Xin ◽  
Hua Wang ◽  
Cunyan Cui ◽  
Jiguang Zhao
Keyword(s):  
Optimal Design ◽  
Wall Thickness ◽  
Equivalent Stress ◽  
Design Model ◽  
Bottom Wall ◽  
Cylinder Wall ◽  
Significant Research ◽  
Maximum Equivalent Stress ◽  
Liquid Rocket ◽  
Propellant Tank

The propellant tank is a vital part for the liquid rocket, and the optimal design of the propellant tank is a significant research to develop the heavy rocket. This paper aims at providing an optimal design model for tank wall thickness. Through establishing the tank mathematical model, analyzing the stress distributions of tank, and defining the equivalent stress of tank, the wall thickness parameters of tank roof, cylinder, and bottom are obtained. The effects of tank parameters on the wall thickness are analyzed to determine the distribution rules of tank roof, cylinder, and bottom wall thickness parameters. Combined with the safety factor that is defined as the ratio of the material's ultimate stress to the maximum equivalent stress, the optimal design model with invariable tank roof and bottom wall thicknesses and variable tank cylinder wall thickness is established. Finally, the optimal design model is verified by comparing the optimal tank with the original tank. The results show that the optimal design model can effectively decrease the mass of the tank and improve the stress distribution of the tank.

Vibration Modal Analysis and Structural Optimal Design of Car Rear-View Mirror Based on ANSYS

2012 ◽  
Vol 549 ◽  
pp. 848-851
Author(s):  
Zhi Ping Zhang ◽  
Han Wu Liu ◽  
Wen Tao He ◽  
Yong Hui Gao
Keyword(s):  
Optimal Design ◽  
Dynamic Characteristics ◽  
Equivalent Stress ◽  
Low Rank ◽  
Strength Analysis ◽  
Modal Frequency ◽  
Rear View Mirror ◽  
Finite Element Software ◽  
Optimizing Design ◽  
Maximum Equivalent Stress

In order to improve the safety of the moving car,we have to make simulation and analysis of the dynamic characteristics of the car rear-view mirror. We should consider, in addition to the geometric dimensions, standards and demands, a reasonable choice of the mirror size and installing position, the dynamic characteristics of the car rear-view mirror in the design of the car rear-view mirror. In this paper, we use the finite element software ANSYS to simulate the vibration frequency and vibration modals of the car rear-view mirror under the condition of excitation sources. Based on this and the strength analysis results of the rear-view mirror, we make a optimal design of the rear-view mirror structure. We get five-order vibration modals in working condition and analysis the size of displacement and deformation, and dynamic characteristics. The results show that because of the low modal frequency, the car rear-view mirror is easily inspired by the engine, powertrain system and road to vibrate. Besides, the deformation and the strain distribution of the rear-view mirror are not uniform. So we should control the low rank flexibility modal frequency within a certain threshold frequency when designing its structure. On the condition of little changes of its overall volume, the maximum equivalent stress of the rear-view mirror decreased by 30.5% through optimizing design.

Optimization Design of EMU Process Bogie Wheel Frame Based on ANSYS

2014 ◽  
Vol 556-562 ◽  
pp. 1446-1449
Author(s):  
Jun Dai
Keyword(s):  
Optimization Design ◽  
Equivalent Stress ◽  
Static Characteristic ◽  
Frame Structure ◽  
Ansys Software ◽  
Modal Shape ◽  
Structure Deformation ◽  
Maximum Equivalent Stress ◽  
Saw Blade ◽  
D Model

According to the saw blade for process bogie structure characteristics,the use of Pro /E 3 d software based on the 3 d model,with ANSYS software,a static and modal analysis,obtained the stress pattern,structure deformation diagram and the former 6 order natural frequency and modal shape. The analysis results show that the node the maximum equivalent stress and the maximal displacement nodes are within the scope of the provisions,the data are meet the requirements,frame structure overall stiffness is better,frame has good static characteristic and dynamic characteristic,can meet the design requirements.And on this basis to frame was further optimized,so as to save materials,reduce cost.The theoretical basis is provided for the development of the process bogie .

Dynamic Load Simulation Analysis of Hemp Stalk

2013 ◽  
Vol 303-306 ◽  
pp. 2724-2726
Author(s):  
Xue Qiang Liu ◽  
Jian Chun Zhang ◽  
Hao Zhang ◽  
Xin Hu
Keyword(s):  
Feeding Rate ◽  
Rotation Speed ◽  
Simulation Analysis ◽  
Equivalent Stress ◽  
Stress And Strain ◽  
Ansys Software ◽  
Bast Fiber ◽  
Maximum Equivalent Stress ◽  
The Difference ◽  
Load Simulation

The distribution of maximum equivalent stress on hemp stalks at different roller speeds were scavenged by LS-PREPOST function. The stress and strain distributions of hemp stalk under the transversely even-distributed load are analyzed through ANSYS software. The results show that hemp decortication largely depended on the rotation speed of separation roller and the feeding rate. In addition, the failure degree of bast fiber, the maturity and the water content of the stalk, and the difference in mechanical properties and geometrical size should be also taken into account.

Strength Analysis of Transitional Segment of Buckling Tubing Nearby the Packer in Vertical Well

2013 ◽  
Vol 634-638 ◽  
pp. 3599-3602
Author(s):  
Shao Li Zhang ◽  
Xin He Wang ◽  
Jiang Wen Xu ◽  
Yi Hua Dou ◽  
Hui Xia
Keyword(s):  
Stress Analysis ◽  
Equivalent Stress ◽  
Continuity Condition ◽  
Strength Analysis ◽  
Nonlinear Ordinary Differential Equations ◽  
Axial Pressure ◽  
Buckling Strength ◽  
Vertical Well ◽  
Maximum Equivalent Stress ◽  
Helical Buckling

The buckling deformation and stress distribution of the tubing nearby the packer would be seriously influenced by the packer constraints. This paper focused on the Strength analysis of transitional segment. The method to calculate the buckling deformation and the equivalent stress of transitional segment were derived considering the tubing boundary and continuity condition, adopting the fourth-order nonlinear ordinary differential equations and helical buckling strength method. This study makes up for the weakness of traditional stress analysis of the buckling tubing nearby the packer in vertical well, improves the pertinence and accuracy of stress analysis of buckling tubing. The results of analysis show that with the axial pressure increasing lead to the length of the transitional segment irregular fluctuations and the maximum equivalent stress increasing. The equivalent stress would gradually reduce and finally approach a constant.

Study on Meshing Force and Rigid-Flexible Coupling Dynamic Simulation of Cycloid Drive

2014 ◽  
Vol 1039 ◽  
pp. 36-43
Author(s):  
De Yu Su ◽  
Shan Ming Luo ◽  
Jian Wang
Keyword(s):  
Dynamic Simulation ◽  
Equivalent Stress ◽  
Theoretical Method ◽  
Comparison Study ◽  
Ansys Software ◽  
Flexible Coupling ◽  
Gear Teeth ◽  
Gear Design ◽  
Maximum Equivalent Stress ◽  
Coupling Dynamic

The meshing force between pin wheels and gear teeth of modified and standard cycloidal gears is calculated. The parametric model of cycloidal gear and pin wheels is built. The flexible processing of cycloidal gear and pin wheel is conducted using Ansys software. The virtual prototype of cycloid reducer is built. The dynamic simulation of rigid-flexible coupling of modified and standard cycloidal gears has been developed, respectively. The meshing force with friction is calculated and the maximum equivalent stress is obtained. A comparison study of the meshing force using theoretical method is also carried out. It is significant to provide theoretical and technical supports for cycloidal gear design.

Influence of differential reduction rate in adjacent roll reduction zone on internal cracks of high carbon bloom induced by mechanical soft reduction

2021 ◽  
pp. 095440622199005
Author(s):  
Nanfu Zong ◽  
Sida Ma ◽  
Weizhao Sun ◽  
Tao Jing ◽  
Zhifang Lu
Keyword(s):  
Equivalent Stress ◽  
Reduction Rate ◽  
Coupled Model ◽  
Reduction Zone ◽  
High Carbon ◽  
Soft Reduction ◽  
Differential Reduction ◽  
Width Direction ◽  
Maximum Equivalent Stress ◽  
Shrinkage Cavities

To comprehensively investigate and alleviate internal cracks in high carbon bloom induced by mechanical soft reduction (MSR), a 3D thermal-mechanical coupled model, containing two adjacent pairs of reduction rolls, was developed to investigate the influence of differential reduction rate on evolution of stress concentration and displacement in as-cast bloom. In order to effectively provide theoretical basis for actual production, the reduction rate was calculated according to the appropriate reduction amount of each pair of reduction rolls, which can be adopted in the MSR to determinate the appropriate roll reduction amount in adjacent roll reduction zone. With the differential reduction rate of MSR increasing from −2.67 mm/m to 5.33 mm/m, the maximum equivalent stress of cracking area in as-cast bloom significantly decreased under first roll reduction position, the maximal displacement along the bloom width direction is significantly decreased with increasing of the differential reduction rate of MSR under end roll reduction position. According to the results of industrial experiment, the internal cracks were effectively alleviated and center shrinkage cavities were nearly eliminated by optimum designed experiments.

Teks Anekdot dalam Cerita Lisan Yong Dollah Pewarisan Orang Melayu Sebagai Alternatif Pemilihan Bahan Ajar Bahasa Indonesia

GERAM ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 30-43
Author(s):  
Muhammad Mukhlis ◽  
Asnawi Asnawi
Keyword(s):  
Content Analysis ◽  
Research Method ◽  
The Other ◽  
Teaching Material ◽  
Generic Structure ◽  
Alternative Material ◽  
Descriptive Approach ◽  
Alternative Choice ◽  
Generic Structures ◽  
Bahasa Indonesia

This research is entitled as "Anecdotal Text in the Oral Story of Yong Dollah Inheritance of Malays as Alternative Choice for Indonesian Language Teaching Materials". It is inspired by the collection of Yong Dollah stories as the inheritance of Malays in Bengkalis Regency which contain of humor elements. In addition, the stories have the same characteristics with anecdotal text, so that it can be applied as teaching material for Indonesia Language subject in the school. This research method was content analysis of descriptive approach. This research was conducted during six months. The technique used to collect data were documentation and interview. The data of this study were the entire generic structure and language features of anecdotal texts contained in a collection of Yong Dollah stories which consisted of 11 stories. The result showed that as following. First, there are five texts contain of complete generic structures and six texts contain of incomplete generic structure which is coda part for data 2, 3, 5, 8, and 1. Second, about language features, there are four data contains of all language features of Anecdote text, but on the other side, there are seven incomplete language features in the texts. Third, the consideration of choosing Yong Dollah as alternative material for Indonesia Language subject refers to eight indicators that are conveyed based on teachers’ perception toward Anecdote text Yong Dolla. 55 % of number of teachers claim that these texts suitable to be implemented as teaching material, but 44% of them claim neutral, and 1% claim disagree on it.

scholarly journals Optimal Design of District Metered Areas in a Water Distribution Network Using Coupled Self-Organizing Map and Community Structure Algorithm

Water ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 836
Author(s):  
Xuan Khoa Bui ◽  
Malvin S. Marlim ◽  
Doosun Kang
Keyword(s):  
Community Structure ◽  
Optimal Design ◽  
Water Distribution ◽  
Distribution Network ◽  
Coupled Model ◽  
Water Distribution Network ◽  
Self Organizing Map ◽  
Structure Algorithm ◽  
Demand Variability ◽  
Self Organizing

Operation and management of a water distribution network (WDN) by district metered areas (DMAs) bring many benefits for water utilities, particularly regarding water loss control and pressure management. However, the optimal design of DMAs in a WDN is a challenging task. This paper proposes an approach for the optimal design of DMAs in the multiple-criteria decision analysis (MCDA) framework based on the outcome of a coupled model comprising a self-organizing map (SOM) and a community structure algorithm (CSA). First, the clustering principle of the SOM algorithm is applied to construct initial homologous clusters in terms of pressure and elevation. CSA is then coupled to refine the SOM-based initial clusters for the automated creation of multiscale and dynamic DMA layouts. Finally, the criteria for quantifying the performance of each DMA layout solution are assessed in the MCDA framework. Verifying the model on a hypothetical network and an actual WDN proved that it could efficiently create homologous and dynamic DMA layouts capable of adapting to water demand variability.

scholarly journals Finite Element Modeling of Residual Stress at Joint Interface of Titanium Alloy and 17-4PH Stainless Steel

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 629
Author(s):  
Nana Kwabena Adomako ◽  
Sung Hoon Kim ◽  
Ji Hong Yoon ◽  
Se-Hwan Lee ◽  
Jeoung Han Kim
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stainless Steel ◽  
Finite Element Modeling ◽  
Equivalent Stress ◽  
Stress Gradient ◽  
Joint Interface ◽  
Element Modeling ◽  
Actual Experiment ◽  
Maximum Equivalent Stress

Residual stress is a crucial element in determining the integrity of parts and lifetime of additively manufactured structures. In stainless steel and Ti-6Al-4V fabricated joints, residual stress causes cracking and delamination of the brittle intermetallic joint interface. Knowledge of the degree of residual stress at the joint interface is, therefore, important; however, the available information is limited owing to the joint’s brittle nature and its high failure susceptibility. In this study, the residual stress distribution during the deposition of 17-4PH stainless steel on Ti-6Al-4V alloy was predicted using Simufact additive software based on the finite element modeling technique. A sharp stress gradient was revealed at the joint interface, with compressive stress on the Ti-6Al-4V side and tensile stress on the 17-4PH side. This distribution is attributed to the large difference in the coefficients of thermal expansion of the two metals. The 17-4PH side exhibited maximum equivalent stress of 500 MPa, which was twice that of the Ti-6Al-4V side (240 MPa). This showed good correlation with the thermal residual stress calculations of the alloys. The thermal history predicted via simulation at the joint interface was within the temperature range of 368–477 °C and was highly congruent with that obtained in the actual experiment, approximately 300–450 °C. In the actual experiment, joint delamination occurred, ascribable to the residual stress accumulation and multiple additive manufacturing (AM) thermal cycles on the brittle FeTi and Fe2Ti intermetallic joint interface. The build deflected to the side at an angle of 0.708° after the simulation. This study could serve as a valid reference for engineers to understand the residual stress development in 17-4PH and Ti-6Al-4V joints fabricated with AM.

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