Materials Having a High Degree of Adhesion for Gripping Elements Designing

2014 ◽  
Vol 613 ◽  
pp. 220-225 ◽  
Author(s):  
Marcel Horák ◽  
František Novotný
Keyword(s):  
Rheological Behaviour ◽  
Adhesive Contact ◽  
Design Solution ◽  
New Materials ◽  
Level Control ◽  
Adhesive Material ◽  
Energy Demands ◽  
Alternative Approach ◽  
High Degree ◽  
Plate Type

The paper analyses one of possibilities to use new materials based on polyurethane, polypropylene or silicone having highly adhesive contact surfaces for gripping elements designing. In concrete terms, it is a case of an alternative approach to the solution of designing standard multi-elements vacuum gripping heads with an active control system (vacuum level control) controlling gripping forces in processes of automatic handling flat objects of the plate type. The aim of this new design solution is to replace individual gripping elements (suction cups) by elements, the surfaces of which coming to the contact with the object handled are provided with adhesion materials. The system minimizing energy demands stemmed from this solution, namely in the way that it decreases or even eliminates the pressure air consumption when combined vacuum-adhesive or only adhesive gripping elements are used. Moreover, it is possible to use the adhesive gripping principle profitably in technological processes susceptible to the environment contamination with airflow when manufacturing new products with many functional layers. Besides a general analysis of problems, the paper presents outputs of laboratory tests. Also a computer model of the contact respecting rheological behaviour of the adhesive material basic matrix is given.

Prospects for the use of the “model budget” in the distribution of equalization grants in Russia

2019 ◽  
pp. 21-38
Author(s):  
Alexander N. Deryugin ◽  
Ilya A. Sokolov
Keyword(s):  
Intergovernmental Relations ◽  
Unfunded Mandates ◽  
Interregional Inequality ◽  
Alternative Approach ◽  
The Russian Federation ◽  
Regional Authorities ◽  
High Degree ◽  
Equalization Grants ◽  
The Impact ◽  
Budget Expenditure

The paper analyzes the impact of the “model budget” on the problems of intergovernmental relations in the Russian Federation: a high proportion of expenditure obligations of regional and local budgets and a high degree of interregional inequality in fiscal capacity and socio-economic development. It was concluded that the planned broader use of the “model budget” will not solve the problem of unfunded mandates and will lead first to a significant reduction in incentives for regional authorities to develop the territorial revenue base, and then to economic slowdown in the country. As an alternative approach to improving intergovernmental relations, options are being considered for adjusting the parameters of the equalization transfers distribution formula, the procedure for determining their total volume and calculating the budget expenditure index. In solving the problem of unfunded mandates, an equally important role is given to the procedure for preparing a financial and economic rationale for draft laws.

scholarly journals AN ALTERNATIVE APPROACH TO IDENTIFY KEY INDUSTRIES: ISSUES TO SELECTION CRITERIA

2014 ◽  
Vol 15 (3) ◽  
pp. 577-598
Author(s):  
Abul Quasem Al-Amin ◽  
Abdul Hamid Jaafar
Keyword(s):  
Selection Criteria ◽  
Public Investment ◽  
Correct Identification ◽  
The Public ◽  
Study Approach ◽  
Sectoral Planning ◽  
Alternative Approach ◽  
The Subject ◽  
Key Industries ◽  
High Degree

Within a process of modeling exercise, this study aimed to understand appropriate selection criteria to identify key industries. There are many key sector identification linkage measures in the subject matter and sensitivity issue among them can be tricky because many of these measures differ only slightly but can result in outcomes that are quite dissimilar. With this background, we proposed an alternate approach that helps to resolve this issue. The proposed approach utilizes in this study by five sub-methods and high degree of the frequency of their occurrences in sub-methods to determine the key sectors. The study approach is applied to Malaysia as the public sector investment remains a large share in the national economy, like other developing countries, and the correct identification is still a challenge for sectoral planning. The experiences from this study can be used to guide appropriate public investment in Malaysia and elsewhere with similar economic forms.

scholarly journals Geometric control of quadrotor UAVs using integral backstepping

2021 ◽  
Vol 22 (1) ◽  
pp. 53
Author(s):  
Ali Bouchaib ◽  
Rachid Taleb ◽  
Ahmed Massoum ◽  
Saad Mekhilef
Keyword(s):  
Control System ◽  
Dynamic Model ◽  
Level Control ◽  
Control Laws ◽  
System Nonlinearity ◽  
System Robustness ◽  
The Stability ◽  
High Level ◽  
High Degree ◽  
Quaternion Representation

The traditional quadcopter control systems should deal with two common problems. Namely, the singularities related to the inverse kinematics and the ambiguity linked to the quaternion representation of the dynamic model. Moreover, the stability problem due to the system nonlinearity and high degree of coupling. This paper provides a solution to the two issues by employing a geometrical integral-backstepping control system. The integral terms were added to improve system ability to track desired trajectories. The high-level control laws are considered as a virtual control and transmitted to the low-level to track the high-level commands. The proposed control system along with the quadcopter dynamic model were expressed in the special Euclidean group SE(3). Finally, the control system robustness against mismatching parameters was studied while tracking various paths.

Development of New Adhesives with Share of Secondary Raw Materials for Depositing of Non-Absorbent Facing Elements in Aggressive Environments

2019 ◽  
Vol 808 ◽  
pp. 82-87
Author(s):  
Jindřich Melichar ◽  
Jakub Hodul ◽  
Kamila Bergerová ◽  
Rostislav Drochytka
Keyword(s):  
Research And Development ◽  
High Temperatures ◽  
Raw Materials ◽  
Chemical Compounds ◽  
New Materials ◽  
Adhesive Material ◽  
Is Research ◽  
Secondary Raw Materials ◽  
Adhesive Mixtures ◽  
Adhesive Materials

The main focus of this paper is research and development of new adhesive materials which will be possible to apply and withstand conditions of environments with exposure to aggressive chemical compounds. These new materials will also be required to withstand high temperatures up to 100°C. Main application of developed adhesives will be during laying of non-absorbent tiles mainly made from cast basalt. Several secondary raw materials were considered during the development of new adhesive mixtures as possible replacement of silicate filler components of new materials. The goal is to develop a new adhesive material with properties as close as possible to the highly durable non-absorbent elements used in stressed environments, mainly because the material will be also used for pointing between individual elements.

Wooden Trusses With Nodal Joints On Glued Flat Rods

2020 ◽  
pp. 9-15
Keyword(s):  
Bearing Capacity ◽  
Test Procedure ◽  
Experimental Studies ◽  
Operational Reliability ◽  
Design Solution ◽  
Short Term ◽  
High Degree ◽  
Wooden Structures ◽  
Node Type

Wooden trusses are widely used in construction and differ in a variety of structural forms. In general, their bearing capacity and stiffness are determined by the design solution of the node joints. In order to accept significant loads and reduce the overall deformation of trusses, it is necessary to develop new types of nodes that would also be characterized by low labor intensity of manufacturing and a high degree of operational reliability. Proposed by the authors nodes of wooden trusses based on steel glued flat rods are met the above requirements. The article describes the results of experimental studies of a wooden truss with nodal joints on glued flat rods under the short-term loads. The layout principles of the proposed node type are given; test procedure of experimental structures and results of experimental studies are presented: features of operation of steel connecting plates glued into wood in the nodes are revealed. It is shown that the adopted design solution of nodes refers to the joints of wooden structures of a rigid type and provides sufficient load-bearing capacity of the trusses and their increased rigidity. The nature of the destruction and the value of the destructive load confirmed the operational reliability of the proposed type of wooden trusses, including under the action of long-term loads. The analysis of the results revealed the directions of further improvement of wooden trusses nodes with steel glued flat rods.

Variability and Component Criticality in Component Reuse and Remanufacturing Systems

2007 ◽  
Author(s):  
Vijitashwa Pandey ◽  
Deborah Thurston
Keyword(s):  
Design Solution ◽  
Complex Nature ◽  
Design Decision ◽  
Component Reuse ◽  
Contributing Factors ◽  
System A ◽  
Take Back ◽  
Two Measures ◽  
High Degree

Product take-back and remanufacturing systems are difficult to implement cost-effectively. Two contributing factors to this problem are the complex nature of the interrelationships among components, and their high degree of variability. Legislated take-back mandates have made it imperative for manufacturers to realize when there is value to be recovered in components and when there is not. This paper proposes a component criticality method to help ascertain this remaining value. We also develop a metric that measures the randomness or variability that a reuse alternative imposes on the remanufacturing system. A case study on washing machines illustrates how the two measures can be incorporated into a design decision model, can help reduce the complexity of reuse operations, and result in a superior design solution.

scholarly journals “Push and Pull”: Biomechanics of the Pollination Apparatus of Oncidium spp.

2021 ◽  
Vol 6 ◽  
Author(s):  
Marc Thielen ◽  
Dagmar Voigt ◽  
Friederike Gallenmüller ◽  
Thomas Speck ◽  
Stanislav Gorb
Keyword(s):  
Pollen Grains ◽  
Adhesive Contact ◽  
Mechanical Resistance ◽  
Force Measurements ◽  
Adhesive Material ◽  
Orchid Species ◽  
Orchid Pollination ◽  
Plant Families ◽  
Push And Pull ◽  
Mechanical Barrier

Comprising ca. 28,000, species the Orchidaceae constitute one of the most species-rich plant families. Orchids differ from other monocotyledons i.a., in the formation of so-called pollinaria, which are entities consisting of pollen grains aggregated into compact pollinia and accessory structures, a viscidium and mostly also a pollinium stalk. The viscidium releases an adhesive material that attaches the pollinarium to a pollinator. Pollinaria are part of a complex pollination apparatus that enables the orchids to colonize niches in which only a few individuals of the respective pollinator occur infrequently. Because the aggregated pollen grains are removed from the flower at once, the development of a mechanical barrier ensuring that only suitable pollinators are able to access the flowers and more importantly to remove the pollen are important selective traits. In this paper we describe the functional morphology of the pollination apparatus in two orchid species, Oncidium wentworthianum and O. otogaya, by experimentally mimicking the pollination process. Furthermore, we analyzed the mechanical resistance of this apparatus by means of force measurements and showed that it most probably constitutes a hierarchical two-stage barrier. The first stage consists of the presence of the anther cap that not only protects the pollinia, but also serves to prevent premature removal of young and unripe pollinaria from the flower. As soon as the pollinaria are ripe, the anther cap sheds and the second stage of the mechanical barrier takes effect, a severable bond between pollinarium and rostellum. This bond can be overcome by a potential pollinator, applying a load of at least 10.8 mN (O. otogaya) or 12.6 mN (O. wentworthianum), respectively, on the viscidium which at the same time disengages the pollinarium from its anchorage. The adhesive material produced by the viscidium creates sufficient adhesive contact between pollinarium and pollinator. Potential pollinators, such as Centris spp. or Trigona spp. bees, should be well able to exert such forces by pushing their head/forebody into the orchid flowers. Thus, whether a pollinator is able to detach the pollinarium depends on both how forcefully it can push and how strongly it can pull the orchid pollination apparatus.

Special Gripping Elements for Handling with Flat Objects

2013 ◽  
Vol 282 ◽  
pp. 27-32 ◽  
Author(s):  
Marcel Horák ◽  
František Novotný
Keyword(s):  
Structural Modification ◽  
Load Capacity ◽  
Contact Boundary ◽  
Radial Load ◽  
New Materials ◽  
Adhesion Layer ◽  
Vacuum Level ◽  
Suction Cup ◽  
Supporting Plate ◽  
High Degree

The paper analyses possibilities to use new materials having a high degree of adhesion for designing vacuum gripping elements with a view to increase the radial capacity and at the same time to preserve the compressed air consumption or the vacuum level. Structural modification of the suction cup is presented with a bearing supporting plate having a material with an adhesion layer on the contact boundary and allowing the down-pressure to be regulated depending on mechanical properties of the object kept. In conclusion the results achieved are summarized illustrating a marked increase of the radial load capacity with regard to the defined vacuum level and the degree of shifting in the contact profile compared with the standard suction cups with a similar geometrical diameter in relation to the contact surface.

Research and Implementation of Lithium Primary Battery Management System for Mine Rescue Equipment

2013 ◽  
Vol 423-426 ◽  
pp. 2635-2638
Author(s):  
Jian Jun Wang ◽  
Xue Qing Yuan ◽  
Bo Li
Keyword(s):  
Management System ◽  
Technical Specification ◽  
Battery Management System ◽  
Battery Management ◽  
Emergency Rescue ◽  
Energy Demands ◽  
Primary Battery ◽  
Safety And Reliability ◽  
High Degree ◽  
Mine Rescue

This coal mine rescue equipment can provide emergency refuge, basic conditions for survival for distress miners in event of a sudden emergency. In accordance with the mining flameproof (and safety) type lithium manganese dioxide primary battery power and other safety technical specification, developed a lithium primary battery management system which uses the 32 bit LPC1758 as its master controller MCU cooperate with C8051F500 as its slave controller MCU.This system can be real-time monitoring of various operation parameters of the battery and it is a system with safety and reliability, high degree of automation, flexible combination and other advantages. This system is able to meet various mine emergency rescue equipment energy demands.

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