A New Approach to Precision Cropping with Radial Forging

2011 ◽  
Vol 291-294 ◽  
pp. 3064-3068 ◽  
Author(s):  
Sheng Dun Zhao ◽  
Bin Zhong ◽  
Yong Tang ◽  
Ren Feng Zhao
Keyword(s):  
Radial Displacement ◽  
Experimental Results ◽  
Feasibility Analysis ◽  
Stress And Strain ◽  
Radial Forging ◽  
New Approach ◽  
Strain Concentration ◽  
Working Principle ◽  
Radial Forging Machine ◽  
Loading Sequence

This paper presents a new approach to precision cropping with radial forging, it skillfully utilizes the stress and strain concentration effect of the prefabricated V-shaped notch and the principle of the radial-forging machine to achieve the regular fracture of metal bar. The basic working principle of the new radial-forging cropping method is discussed in detail. Moreover, the distribution of the radial displacement loads is discussed in detail, and the loading rules are clearly explained under the conditions of the single cropping die, two cropping dies, three cropping dies and four cropping dies, as well as the radial-forging loading sequence. The model and equation of the movement with the radial-forging are established, the feasibility analysis of the radial-forging cropping method is carried out, which is in agreement with the experimental results.

Yaw Galloping of a TLWP Platform Under High Speed Currents by Analytical Methods and its Comparison With Experimental Results

2017 ◽  
Author(s):  
Francisco Lamas ◽  
Miguel A. M. Ramirez ◽  
Antonio Carlos Fernandes
Keyword(s):  
High Speed ◽  
Production Systems ◽  
Experimental Tests ◽  
Experimental Results ◽  
Analytical Methodology ◽  
New Approach ◽  
Laboratory Facilities ◽  
Polynomial Curve ◽  
Computational Fluid Dynamics Cfd ◽  
Cfd Analyses

Flow Induced Motions are always an important subject during both design and operational phases of an offshore platform life. These motions could significantly affect the performance of the platform, including its mooring and oil production systems. These kind of analyses are performed using basically two different approaches: experimental tests with reduced models and, more recently, with Computational Fluid Dynamics (CFD) dynamic analysis. The main objective of this work is to present a new approach, based on an analytical methodology using static CFD analyses to estimate the response on yaw motions of a Tension Leg Wellhead Platform on one of the several types of motions that can be classified as flow-induced motions, known as galloping. The first step is to review the equations that govern the yaw motions of an ocean platform when subjected to currents from different angles of attack. The yaw moment coefficients will be obtained using CFD steady-state analysis, on which the yaw moments will be calculated for several angles of attack, placed around the central angle where the analysis is being carried out. Having the force coefficients plotted against the angle values, we can adjust a polynomial curve around each analysis point in order to evaluate the amplitude of the yaw motion using a limit cycle approach. Other properties of the system which are flow-dependent, such as damping and added mass, will also be estimated using CFD. The last part of this work consists in comparing the analytical results with experimental results obtained at the LOC/COPPE-UFRJ laboratory facilities.

Flexible Stretch Forming Technology for Sheet Metal Based on Discrete-Gripper and Multi-Point Die

2014 ◽  
Vol 556-562 ◽  
pp. 460-463 ◽  
Author(s):  
Xue Chen ◽  
Ming Zhe Li ◽  
Wen Hua Liu ◽  
Zhi Qiang Hou
Keyword(s):  
Sheet Metal ◽  
Experimental Results ◽  
Shape Error ◽  
Stretch Forming ◽  
Forming Process ◽  
Structural Composition ◽  
Forming Technology ◽  
Working Principle ◽  
Material Utilization

To solve the problem of low material utilization in traditional stretch forming process, a flexible stretch forming method was proposed, which can be realized by interaction of the multi-point stretch forming die with discrete-gripper stretch forming machine. The principle and characteristics of sheet metal flexible stretch forming technology was introduced, structural composition and working principle of the multi-point stretch forming die and discrete-gripper stretch forming machine were expounded, and the technology experiments was carried out with a self-designed flexible stretch forming technology equipment for sheet metal. The experimental results indicate that structure of multi-point stretch forming die and discrete-gripper stretch forming machine are reasonable, and flexible stretch forming technology can be realized by above-mentioned die and machine, stretch forming parts has a good quality and its shape error can satisfy requirements of production.

Prediction of soot formation rates: a new approach

1974 ◽  
Vol 338 (1614) ◽  
pp. 375-396 ◽  
Keyword(s):  
Soot Formation ◽  
Rocket Engine ◽  
Experimental Results ◽  
Intermediate Species ◽  
New Approach ◽  
Fundamental Model ◽  
Gas Reactions ◽  
Gaseous Hydrocarbons ◽  
Controlling Processes ◽  
Exhaust Jet

Five processes controlling the production of soot from gaseous hydrocarbons are distinguished: gas reactions producing radical fragments on which nucleation may begin; nucleation; coagulation; growth; and oxidation. A fundamental model capable of taking into account all these processes is described. The model is applied to the conditions of a practical rocket engine, in which production of soot in the exhaust jet is governed by the rate of pyrolysis of methane in the chamber. Predictions made for these conditions agree with experimental results. The rate controlling processes and key intermediate species are identified.

A New Approach for Autonomous Robot Obstacle Avoidance Using PSD Infrared Sensor Combined with Digital Compass

2014 ◽  
Vol 511-512 ◽  
pp. 101-104 ◽  
Author(s):  
Yang Xue ◽  
Jun Tao Yang ◽  
Ya Ling Dong ◽  
Jia Li Shen ◽  
Ru Peng ◽  
...  
Keyword(s):  
Mobile Robots ◽  
Obstacle Avoidance ◽  
Autonomous Robot ◽  
Experimental Results ◽  
Position Sensitive Detector ◽  
Infrared Sensor ◽  
Sensitive Detector ◽  
New Approach ◽  
Position Sensitive

This paper presents a new approach for obstacle avoidance of small mobile robots, which combine the position sensitive detector (PSD) with digital compass. It is important for an autonomous robot to explore its surroundings in performing the task of localization and navigation for searching. Because of the complexity of the environment, one simple kind of sensors is not sufficient for robot to accomplish these tasks. In this paper, the small mobile robots are enabled to identify barriers and distinguish surroundings by using the angle signal from the digital compass which is generally mounted on the robot. Experimental results indicate that this approach based on digital compass shows great potential in autonomous robot obstacle avoidance.

scholarly journals UWB elliptical patch monopole antenna with dual-band notched characteristics

2019 ◽  
Vol 9 (5) ◽  
pp. 3591
Author(s):  
A H Majeed ◽  
K H Sayidmarie
Keyword(s):  
Radiation Pattern ◽  
Ground Plane ◽  
Monopole Antenna ◽  
Experimental Results ◽  
Dual Band ◽  
New Approach ◽  
Compact Size

<p class="Default">In this paper, a new approach to the design of an UWB monopole antenna with dual band-notched characteristics is presented.   The antenna has the form of an elliptical monopole over a ground plane having an elliptical slot to achieve the UWB. The dual-band notch function is created by inserting a U-shaped and a C-shaped slots on the radiating patch, thus no extra size is needed. The proposed antenna shows a good omnidirectional radiation pattern across the band from 3.2 to more than 14 GHz. The dual band-rejection is for 4.88-5.79GHz centered at 5.4GHz and 7.21-8.46 GHz centered at 7.8 GHz. The antenna prototype using the FR-4 substrate with ε<sub>r</sub>=4.3 has a compact size of 25mm×25 mm ×1.45mm. The fabricated prototype showed experimental results comparable to those obtained from the simulations.</p>

Experiment Study on Novel Precision Cropping Machinery Using Rotary Striking Action

2013 ◽  
Vol 281 ◽  
pp. 287-292 ◽  
Author(s):  
Ren Feng Zhao ◽  
Sheng Dun Zhao ◽  
Bin Zhong
Keyword(s):  
Industrial Production ◽  
Experimental Results ◽  
Control Mode ◽  
Experiment Study ◽  
New Process ◽  
Different Types ◽  
New Type ◽  
Working Principle ◽  
Process Method

This paper illuminates a new type of precision cropping process method with rotary striking action. The new process makes use of a controllable circumferential strike on a metal bar with a V-shaped notch. The working principle of the machine is described. Different types of metal bars have been tested, and both bad results and successful results were stated in the paper. The most ideal control mode has been obtained. The experimental results show that the new cropping process can crop bars with different materials and diameters. In some cases, it can be directly used in the subsequent industrial production.

Enhancing HE Stain Images Through an Advanced Soft Computing-Based Adaptive Ameliorated CLAHE

2020 ◽  
pp. 256-277
Author(s):  
Dibya Jyoti Bora
Keyword(s):  
Medical Imaging ◽  
Soft Computing ◽  
Crucial Role ◽  
Experimental Results ◽  
The Other ◽  
New Approach ◽  
Satisfactory Level ◽  
Analysis Process

HE stain images play a crucial role in the medical imaging process. Often these images are regarded as of golden standards by physicians for the quality and accuracy. These images are fuzzy by nature, and hence, traditional hard-based techniques are not able to deal with this. Thereby, a decrease in the accuracy of the analysis process may be experienced. Preprocessing of these images is utmost needed so that the fuzziness may be removed to a satisfactory level. A new approach for tackling this problem is introduced in this chapter. The proposed technique is soft computing-based advanced adaptive ameliorated CLAHE. The experimental results demonstrate the superiority of the proposed approach than the other traditional techniques.

Design of Underground Displacement Monitoring Circuit Based on STC89C58

2014 ◽  
Vol 602-605 ◽  
pp. 1916-1919
Author(s):  
Ke Gang Hu ◽  
Yi Lian Zhou ◽  
Qing Li
Keyword(s):  
System Design ◽  
Real Time ◽  
Humidity Sensor ◽  
Experimental Results ◽  
Stable Operation ◽  
Displacement Monitoring ◽  
Acceleration Sensor ◽  
The Core ◽  
Hardware System ◽  
Working Principle

Using STC89C58 MCU as the core, through the acceleration sensor and a humidity sensor for the monitoring the displacement of underground conditions, to simply realize real-time monitoring function of the displacement of underground. Introduces the working principle and software/hardware system design. The experimental results show that, the system has stable operation, achieved the expected goals.

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