Analysis of Transverse Vibration Modes of a Gun Barrel Subjected to Recoil

2014 ◽  
Vol 592-594 ◽  
pp. 2011-2015 ◽  
Author(s):  
Pravin Kumar ◽  
S.K. Nayak ◽  
Anil M. Datar ◽  
Gian Bhushan
Keyword(s):  
Performance Evaluation ◽  
Finite Elements ◽  
Cantilever Beam ◽  
Analytical Method ◽  
Transverse Vibration ◽  
Mode Shapes ◽  
Vibration Modes ◽  
Gun Barrel ◽  
And Performance ◽  
Selection Of

This paper focuses on the calculation of modal frequencies and corresponding mode shapes of Gun Barrel by analytical method and the Finite Elements Method. Modal analysis is used to find out natural and succeeding two modes frequencies for transverse vibration. Barrel is considered as a cantilever beam. Recoil of Gun Barrel is incorporated as variation in the length cantilever beam. Increase in modal frequencies due to gun barrel recoil is observed. It is concluded that the transverse vibration of gun barrel coupled with the recoil produces a band of frequencies in each modes. The analysis and results discussed can be used for design and performance evaluation, selection of accessories and attachments of gun systems.

Dimensional Synthesis and Performance Evaluation of Four Translational Parallel Manipulators

Robotica ◽  
2020 ◽  
pp. 1-17 ◽  
Author(s):  
I. Ben Hamida ◽  
M. A. Laribi ◽  
A. Mlika ◽  
L. Romdhane ◽  
S. Zeghloul
Keyword(s):  
Genetic Algorithm ◽  
Performance Evaluation ◽  
Parallel Manipulators ◽  
Parallel Robots ◽  
Dimensional Synthesis ◽  
Optimum Selection ◽  
Kinematic Performance ◽  
And Performance ◽  
Pareto Fronts ◽  
Selection Of

SUMMARY The optimum selection of a structure for a given application is a capital phase in typological synthesis of parallel robots. To help in this selection, this paper presents a performance evaluation of four translational parallel robots: Delta, 3-UPU, Romdhane-Affi-Fayet, and Tri-pyramid (TP). The problem is set as a multiobjective optimization using genetic algorithm methods, which uses kinematic criteria, that is, global dexterity and compactness, to ensure a prescribed workspace. The results are presented as Pareto fronts, which are used to compare the performances of the aforementioned structures. The obtained results show that the TP robot has the best kinematic performance, whereas the 3-UPU robot is the most compact for a given prescribed workspace.

A SEGMENT BASED APPROACH FOR THE REDUCTION OF THE NUMBER OF TEST CASES FOR PERFORMANCE EVALUATION OF COMPONENTS

2009 ◽  
Vol 19 (04) ◽  
pp. 481-505 ◽  
Author(s):  
JOÃO W. CANGUSSU ◽  
KENDRA COOPER ◽  
W. ERIC WONG
Keyword(s):  
Performance Evaluation ◽  
Residual Error ◽  
Test Cases ◽  
Functional Requirements ◽  
Functional Behavior ◽  
Opposite Behavior ◽  
And Performance ◽  
The Cost ◽  
Software Development Techniques ◽  
Selection Of

Component-based software development techniques are being adopted to rapidly deploy complex, high quality systems. One of its aspects is the selection of components that realize the specified requirements. In addition to the functional requirements, the selection must be done taking into account some non-functional requirements such as performance, reliability, and usability. Hence, data that characterize the non-functional behavior of the components is needed; a test set is needed to collect this data for each component under consideration. This set may be large, which results in a considerable increase in the cost of the development process. Here, a process is proposed to considerably reduce the number of test cases used in the performance evaluation of components. The process is based on sequential curve fittings from an incremental number of test cases until a minimal pre-specified residual error is achieved. The incremental selection of test cases is done in two different ways: randomly and adaptively. The accuracy and performance of the proposed approach are dependent on the values of the desired residual error. The smaller the residual error, the higher the accuracy. However, performance has an opposite behavior. The smaller the error, the larger the number of test cases needed. The results from experiments with image compression components are a clear indication that a reduction in the number of test cases can be achieved while maintaining reasonable accuracy when using the proposed approach.

Vibration Modes of Centrifugally Stiffened Beams

1982 ◽  
Vol 49 (1) ◽  
pp. 197-202 ◽  
Author(s):  
A. D. Wright ◽  
C. E. Smith ◽  
R. W. Thresher ◽  
J. L. C. Wang
Keyword(s):  
Finite Element ◽  
Boundary Conditions ◽  
Cantilever Beam ◽  
Mass Distribution ◽  
Flexural Rigidity ◽  
Mode Shapes ◽  
Vibration Modes ◽  
Finite Element Code ◽  
Rotating Beams ◽  
Tip Mass

The method of Frobenius is used to solve for the exact frequencies and mode shapes for rotating beams in which both the flexural rigidity and the mass distribution vary linearly. Results are tabulated for a variety of situations including uniform and tapered beams, with root offset and tip mass, and for both hinged root and fixed root boundary conditions. The results obtained for the case of the uniform cantilever beam are compared with other solutions, and the results of a conventional finite-element code.

Implementation and performance evaluation of two fuzzy-based systems for selection of IoT devices in opportunistic networks

2018 ◽  
Vol 10 (2) ◽  
pp. 519-529 ◽  
Author(s):  
Miralda Cuka ◽  
Donald Elmazi ◽  
Kevin Bylykbashi ◽  
Evjola Spaho ◽  
Makoto Ikeda ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Opportunistic Networks ◽  
Iot Devices ◽  
And Performance ◽  
Selection Of

scholarly journals Construction and Performance Evaluation of a Solar Powered Maize Sheller for Rural Farmers

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
M.O Lawal
Keyword(s):  
Performance Evaluation ◽  
Production Cost ◽  
Design Calculation ◽  
Total Production ◽  
The Sun ◽  
Rural Farmers ◽  
Mechanical Part ◽  
And Performance ◽  
Solar Powered ◽  
Selection Of

The objective of this work is to construct a simple and affordable maize shelling machine that is powered by solar energy. The method adopted involves the selection of a direct current (DC) operated motor which consumes less power and is locally available. Based on the available motor, the mechanical part is fabricated to work with the motor. Direct coupling method is adopted between the motor and the mechanical part. The improvement in this work is the introduction of a sustainable and affordable powering method. Design calculation has suggested the use of an 80-watt solar panel. A battery of 18Ah capacity is used as storage to cushion the effect of the intermittent nature of the sun. Test carried out on the sheller shows that it has the ability to shell 17.25 kg of kernel in one hour. It has also been shown that the developed device has an efficiency of 89.61%. The total production cost of this sheller (together with the solar power system) is approximately sixty thousand naira (N60,000.00/$167).

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