scholarly journals Optimization Method for Determination of Swelling Factor Linum usitatissimum Seeds

2019 ◽  
Vol 11 (5) ◽  
pp. 936-943
Author(s):  
Dhanalakshmi S Dhanalakshmi ◽  
Hemalatha CN Hemalatha ◽  
Sai Ramya Bharathi ◽  
Dhivya C Dhivya ◽  
Vanishree S Vanishree ◽  
...  
Keyword(s):  
Linum Usitatissimum ◽  
Optimization Method ◽  
Swelling Factor

A Hybrid Approach to Computer-Aided Process Planning for Prismatic Parts

1994 ◽  
Author(s):  
Y. F. Zhang ◽  
A. Y. C. Nee ◽  
J. Y. H. Fuh
Keyword(s):  
Process Planning ◽  
Hybrid Approach ◽  
Optimization Method ◽  
Optimal Operation ◽  
Operation Sequencing ◽  
Computer Aided Process Planning ◽  
Prismatic Parts ◽  
Minimum Number ◽  
Set Up

Abstract One of the most difficult tasks in automated process planning is the determination of operation sequencing. This paper describes a hybrid approach for identifying the optimal operation sequence of machining prismatic parts on a three-axis milling machining centre. In the proposed methodology, the operation sequencing is carried out in two levels of planning: set-up planning and operation planning. Various constraints on the precedence relationships between features are identified and rules and heuristics are created. Based on the precedence relationships between features, an optimization method is developed to find the optimal plan(s) with minimum number of set-ups in which the conflict between the feature precedence relationships and set-up sequence is avoided. For each set-up, an optimal feature machining sequence with minimum number of tool changes is also determined using a developed algorithm. The proposed system is still under development and the hybrid approach is partially implemented. An example is provided to demonstrate this approach.

scholarly journals DETERMINATION OF FOOT-PLATE SPACING FOR SWIVEL WALKERS BY AN OPTIMIZATION METHOD

2010 ◽  
Vol 22 (03) ◽  
pp. 213-221
Author(s):  
Chih-Hsiu Cheng ◽  
Liang-Wey Chang ◽  
Kwan-Hwa Lin
Keyword(s):  
Theoretical Work ◽  
Optimization Method ◽  
Clinical Applications ◽  
The Body ◽  
Coronal Plane ◽  
Biped Locomotion ◽  
Optimal Design Problem ◽  
Plate Spacing ◽  
Feasible Range

Swivel walkers have been useful devices in ambulation for many young paraplegic patients for being advantageous in providing reliable stability, easy handling, and hands-free walking. The placement of the foot-plates on swivel walkers affects the gait efficiency. However, the determination of the foot-plate spacing has been purely empirical and no theoretical work has been attempted before. This study aimed to develop a dynamic model of the swivel walker in the coronal plane to formulate an optimal design problem such that the energy loss due to impact could be computed and minimized within a feasible range of the coronal-plane movement. Children of heights from 0.75 to 1.45 m and weights from 15 to 45 kg fitted with the conventional swivel walkers were simulated. The results indicated that the range of the foot-plate spacing was roughly between 1/4 and 1/6 of the body heights. A regression formula was also derived to estimate foot-plate spacing with respect to the heights and weights of the simulated subjects for clinical applications. We conclude that the theoretical framework not only builds a foundation to determine the foot-plate spacing, but also reveals the dynamic behavior of the swivel walkers in the coronal plane. The results could be applied to the design of other biped locomotion systems.

Multifrequency optimization method of measurement the frequency dependency of electrophysical parameters of dielectric and magnetodielectric coatings

2021 ◽  
pp. 54-61
Author(s):  
Aleksandr I. Kaz'min
Keyword(s):  
Frequency Dependence ◽  
Radio Wave ◽  
Optimization Method ◽  
Metal Substrate ◽  
Geometric Parameters ◽  
Microwave Range ◽  
Electrodynamic Modeling ◽  
Wave Methods ◽  
Electrophysical Parameters

The issues of experimental determination of electrodynamic parameters of existing and new synthesized materials and coatings used in the microwave range are highlighted. Problems arising from measurements of the electrophysical and geometric parameters of dielectric and magnetodielectric coatings, taking into account their placement on a metal substrate, by radio wave methods are considered. We present the new radio wave method of joint measurements of the frequency dependence of the complex permittivity, the frequency dependence of the complex magnetic permeability, and the thickness of plane-layered samples of dielectric and magnetodielectric coatings on a metal substrate. Determination of electrophysical and geometric parameters of the coating in the proposed method is reduced to minimizing the objective function constructed based on the discrepancy between the experimental and design theoretical values of the attenuation coefficients of surface electromagnetic wave fields on a grid of discrete frequencies. The simulation model of measurements is shown, implemented on the basis of the electrodynamic modeling system CST Microwave studio (Simulia corporation, USA) and the Matlab system. The results of simulation are presented to determine the frequency dependences of the electrophysical parameters and the thickness of a sample of a radio-absorbing coating on a metal substrate. Errors in the estimates of permittivity and permeability in the measurement frequency band 9–13.5 GHz, which are no more than 10 % with a confidence level of 0.95 with a mean square deviation of the noise level of 0.006, have been obtained. The proposed method can be in demand in various science-intensive areas – microelectronic, aerospace, mechanical engineering, etc.

The Ray Optimization Method for the Determination of Workspaces of Planar Parallel Manipulators of General Design

2000 ◽  
Author(s):  
A. M. Hay ◽  
J. A. Snyman
Keyword(s):  
Computer Code ◽  
Parallel Manipulators ◽  
Optimization Method ◽  
Optimization Approach ◽  
Arbitrary Geometry ◽  
Planar Manipulators ◽  
Planar Parallel Manipulator ◽  
Point Interior ◽  
General Method

Abstract An extension to a novel optimization approach for the determination of workspaces of planar manipulators is presented. This approach provides a general method for the determination of manipulator workspaces and has the advantage that it may easily be automated. The method consists of finding a suitable initial radiating point interior to the accessible output set of the manipulator, and then determining the points of intersection of a representative pencil of rays, emanating from this point, with the boundary of the accessible set. The points of intersection are determined by means of an optimization approach in which a dynamic constrained optimization algorithm is used. If any section of the workspace boundary cannot be determined due to non-convexity, then the missing section is mapped using a suitably chosen new radiating point. The method is illustrated by its application to a generally constrained planar parallel manipulator. The method has been implemented in a practical, interactive computer code that has been used to determine convex and non-convex workspaces of different parallel manipulators of arbitrary geometry.

Grasp Configurations Optimization of Dexterous Robotic Hand Based on Haptic Exploration Information

2017 ◽  
Vol 14 (04) ◽  
pp. 1750013 ◽  
Author(s):  
Haiwei Gu ◽  
Yuanfei Zhang ◽  
Shaowei Fan ◽  
Minghe Jin ◽  
Hong Liu
Keyword(s):  
Planning Process ◽  
Optimization Method ◽  
Robot Kinematics ◽  
Robotic Hand ◽  
Grasp Planning ◽  
Research Areas ◽  
Haptic Exploration ◽  
Robot Configurations ◽  
Grasp Quality

Haptic exploration and grasp planning by dexterous robot hand are usually two independent research areas. In this paper, the determination of optimal grasp configurations after haptic exploration of unknown objects is discussed. The haptic exploration information is used to select initial grasp points and the corresponding robot configurations, which greatly improve the efficiency of grasp planning process. The feasible searching regions on the object are obtained under the constrains of manipulability and robot kinematics. Then, the optimization method based on KNN search is applied to find the optimal grasp positions in feasible searching regions. The selected optimal grasp points set can achieve high grasp quality under the constrains of robot kinematics and manipulability. The optimization method combines multiple grasp quality metrics, which is fast and feasible in optimal grasp points searching. Experiments validate the feasibility and effectivity of the proposed method.

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