scholarly journals Accurate Clamping Method of Multipoint Flexible Fixture for Large Complex Surface

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Ruolong Qi ◽  
Xinyuan Mao ◽  
Ke Zhang ◽  
Renbo Xia
Keyword(s):  
Production Efficiency ◽  
Complex Structure ◽  
Complex Surface ◽  
Simulation Method ◽  
C Language ◽  
Rotation Axes ◽  
Large Complex ◽  
Electric Cylinder ◽  
Multibody Structures ◽  
Improve Production Efficiency

In the field of aviation and astronautics, large complex surface parts such as aircraft cabin cover are complex, varying in model, and produced in small batch. In order to reduce fixture cost and improve production efficiency, a variable multipoint and multi-DOF supporting fixture is designed. The coordinate system of the complex structure fixture is defined, and the kinematics of the multibody structures driven by air cylinders are modeled according to the topological principle. With the help of this data structure, fast and optimal search for clamping state can be realized. With the dichotomy method, the driving amount of the electric cylinder of the suction cups and the two rotation angles of two rotation axes at the end of the linkages are solved accurately. Based on the digital twin simulation method, the precise clamping motion of flexible fixture is calculated for an aircraft cockpit cover with a software developed by the authors in C++ language on the Visual studio platform. The distance between the clamping point and the surface was verified with a laser tracker. Finally, the practical experiment of a real cockpit cover clamping proves the practicability and effectiveness of the proposed method.

scholarly journals Winding uplifts and the challenges of weak and strong SUSY breaking in AdS

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Arthur Hebecker ◽  
Sascha Leonhardt
Keyword(s):  
Complex Structure ◽  
Susy Breaking ◽  
Technical Level ◽  
De Sitter ◽  
Large Complex ◽  
Breaking Scale ◽  
Large Complex Structure

Abstract We discuss the problem of metastable SUSY breaking in the landscape. While this is clearly crucial for the various de Sitter proposals, it is also interesting to consider the SUSY breaking challenge in the AdS context. For example, it could be that a stronger form of the non-SUSY AdS conjecture holds: it would forbid even metastable non-SUSY AdS in cases where the SUSY-breaking scale is parametrically above/below the AdS scale. At the technical level, the present paper proposes to break SUSY using the multi-cosine-shaped axion potentials which arise if a long winding trajectory of a ‘complex-structure axion’ appears in the large-complex-structure limit of a Calabi-Yau orientifold. This has been studied in the context of ‘Winding Inflation’, but the potential for SUSY breaking has not been fully explored. We discuss the application to uplifting LVS vacua, point out the challenges which one faces in the KKLT context, and consider the possibility of violating the non-SUSY AdS conjecture in the type-IIA setting of DGKT.

Improving sheep production and welfare in extensive systems through precision sheep management

2012 ◽  
Vol 52 (7) ◽  
pp. 665 ◽  
Author(s):  
Jessica E. Morris ◽  
Greg M. Cronin ◽  
Russell D. Bush
Keyword(s):  
Radio Frequency ◽  
Radio Frequency Identification ◽  
Production Efficiency ◽  
Sheep Industry ◽  
Monitoring Frequency ◽  
Frequency Identification ◽  
Australian Sheep ◽  
Sheep Production ◽  
The Cost ◽  
Improve Production Efficiency

This overview discusses how precision sheep management could be utilised in the Australian sheep industry to improve production efficiency and reduce animal welfare concerns due to low monitoring frequency by stockpeople. The concept of precision sheep management is described. This is a system in which sheep are managed as individuals or small groups rather than as a (whole) flock. Precision sheep management utilises the application of radio frequency identification technology, enabling producers to better monitor sheep in extensive situations, and contribute to improved efficiency of management and sheep welfare. Examples of combining radio frequency identification with other technologies such as walk-over-weighing and Pedigree Matchmaker are discussed. These technologies provide producers with tools to improve the cost effectiveness of, and labour efficiency associated with, collecting data on individual animals. The combined technologies should also improve consistency and reliability of information, enhancing decision-making by producers, for example, from regular monitoring of biometric variables such as liveweight, or calculating breeding values to enable superior genetic comparisons over time.

Meshing Method of High Precision FEM in Large Complex Structural Simulations

2012 ◽  
Vol 195-196 ◽  
pp. 701-704
Author(s):  
Yan Hua Xue ◽  
Zhi Guang Wang ◽  
Xiao Hong Li ◽  
Xin Jiang
Keyword(s):  
Finite Element ◽  
Complex Structure ◽  
Width Ratio ◽  
Two Dimensional ◽  
Element Analysis ◽  
Large Complex ◽  
Mesh Density ◽  
Length Width ◽  
Complex Structural ◽  
Dimensional Element

Shing is playing an important role in the large complex structural FEM simulations; it has a direct effect on calculating precision of structural simulations. For increasing the calculation accuracy and analysis accuracy of complex structure, the finite element meshing problems is proposed on the finite element analysis of large complicated structures. The effects caused by element type, mesh density and intergradations on calculating precision are studied and discussed. A research argues that with length-width ratio of 1~2 and length-thickness ration of 1.5~4.5 of two-dimensional rectangular element, the quality of meshing method of two-dimensional element is above normal. As the height of one-dimensional element is equal to the sum of reinforcing rib height of outer panel and half the thickness of panel, more accurate results can be obtained.

scholarly journals Topological string on toric CY3s in large complex structure limit

2009 ◽  
Vol 813 (3) ◽  
pp. 315-348
Author(s):  
Lalla Btissam Drissi ◽  
Houda Jehjouh ◽  
El Hassan Saidi
Keyword(s):  
Complex Structure ◽  
Topological String ◽  
Large Complex ◽  
Large Complex Structure

Design of Rotary Flexible Manufacturing Cell with Multi-Station Automatic Stretching

2014 ◽  
Vol 635-637 ◽  
pp. 1390-1393
Author(s):  
Yu Zhou ◽  
Xue Wu Hu ◽  
Xiao Ming Sheng
Keyword(s):  
Flexible Manufacturing ◽  
Production Efficiency ◽  
Size Control ◽  
Machining Process ◽  
Circular Disc ◽  
Flexible Manipulator ◽  
Flexible Manufacturing Cell ◽  
Manufacturing Cell ◽  
Automatic Loading ◽  
Improve Production Efficiency

Rotary flexible manufacturing cell with multi-station automatic stretching is designed in this paper to meet the requirements of the machining process of cylindrical drawing parts as well as the needs of different stations for multi-drawing. The cell uses fixed circular disc worktable with multi-station. Each machining station has hydraulic stretcher to complete the drawing of the workpiece. Flexible manipulator finishes automatic loading and unloading among hydraulic stretchers. Gripper of manipulator with automatic center aligning and size control can grip workpiece in various sizes and has the function of self-centering. This equipment has completely realized all the stretching processes automaticly from feeding sheet metal to sending and forming workpieces. It can improve production efficiency and quality. It can also improve safety, reliability and cost efficiency. When replacing worked parts is needed, simply replace modular mold of every station in fixed circular disc worktable.

scholarly journals Effects of Microcredit on the Financial Performance of Small Scale Cooking Oil Processors in Central Malawi

2016 ◽  
Vol 8 (6) ◽  
pp. 159
Author(s):  
Lovemore Mtsitsi ◽  
Joseph K. Dzanja ◽  
Sera Gondwe ◽  
Bonet C. Kamwana
Keyword(s):  
Financial Performance ◽  
Financial Distress ◽  
Production Efficiency ◽  
Mixed Effects ◽  
Small Scale ◽  
Research Approach ◽  
Oil Processing ◽  
Cooking Oil ◽  
Equity Ratio ◽  
Improve Production Efficiency

<p>The study was conducted to determine the effect of microcredit on financial performance of small scale cooking oil processors in central Malawi. Adopting a mixed research approach, the DuPont identity was used to compare the financial strengths and weaknesses between businesses that acquired a microcredit and those that did not. First, the study found that small scale cooking oil processing is a profitable business, regardless of their status in microcredit acquisition. However, microcredit had mixed effects on the financial performance of businesses. Microcredit improved the level of business capital for the businesses translating into better production efficiency, competitiveness and acquisition of a market share thus positively contributing to financial performance. On the other hand, microcredit increased the debt equity ratio hence increasing the businesses’ risk of default. The study recommends the businesses to further improve production efficiency and net asset turnovers. In addition, small and medium scale businesses ought to prudently contract microcredit in order to enhance their financial performance whilst checking for their risk of financial distress.</p>

Research on Mechanical Engineering with Innovative Design of Gantry Planer

2013 ◽  
Vol 345 ◽  
pp. 27-30
Author(s):  
Chang Fa Wang ◽  
Feng Lan Wang
Keyword(s):  
Energy Cost ◽  
Mechanical Engineering ◽  
Production Efficiency ◽  
Mechanical Design ◽  
Work Efficiency ◽  
Innovative Design ◽  
Improve Production ◽  
Improve Production Efficiency

The design for traditional gantry planer aims at its empty stroke and low work efficiency of the two fatal flaws in this paper. We adopted the structure innovation by mechanical design and designed the gantry planer bidirectional shaping turret. And the device is simple in structure and easy in manufacture. These make improved gantry planer remove empty stroke and change one-way shaping into two-way shaping. Thus the improved gantry planer can depress energy cost consumedly and improve production efficiency. This will broaden its market greatly in the machining industry.

Design about the Laser Marking Machineof Two-Work Location

2010 ◽  
Vol 34-35 ◽  
pp. 1540-1544
Author(s):  
Zhong Jie Zhang ◽  
Xin Ping Mao
Keyword(s):  
Large Scale ◽  
Production Efficiency ◽  
Rapid Development ◽  
Scale Production ◽  
Laser Marking ◽  
Domestic Industry ◽  
Work Location ◽  
Improve Production ◽  
Large Scale Production ◽  
Improve Production Efficiency

With the rapid development of social productive forces, the laser marking machine of one-work location has been difficult to meet the needs of large-scale production. In order to save time of to load parts, We design the laser Marking of Two-work location. The laser marking machine of two-work location. has two-work locations, when a work location load parts, other a work location is marking at the same time. Two work location alternate work , So significantly reduces the production of auxiliary time, improve production efficiency and meet customer needs. This design has been widely used in the domestic machining industry now, marking areas of laser marking in the domestic industry is still first.

Research Based on Reverse Engineering Technology of Complex Structure Product

2015 ◽  
Vol 741 ◽  
pp. 806-809
Author(s):  
Ai Qin Lin ◽  
Yong Xi He
Keyword(s):  
Reverse Engineering ◽  
Point Cloud ◽  
Complex Structure ◽  
Laser Scanner ◽  
Complex Surface ◽  
Curved Surface ◽  
Quality Model ◽  
High Quality ◽  
Engineering Technology ◽  
Working Principle

Introduced reverse engineering technology and working principle. Researched reverse design process of the complex curved surface "spider". The data were collected by means of multiple scanning measuring with laser scanner. Used Geomagic Studio software for date point cloud processed of complex curved surface. Used UG software for surface reconstruction designed. Product reduction and improvement of the design were finished rapidly and high quality. Model of spider was printed with rapid prototyping technology. Compared with physical, the model’s reliability and accuracy were verified by reverse engineering design.Keywords: complex surface; reverse engineering technology; UG; Geomagic Studio software

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