scholarly journals A Noncontact Method for Calibrating the Angle and Position of the Composite Module Array

2020 ◽  
Vol 10 (12) ◽  
pp. 4358
Author(s):  
Xinghua Li ◽  
Jue Li ◽  
Xuan Wei ◽  
Xiaohuan Yang ◽  
Zhikun Su ◽  
...  
Keyword(s):  
Machine Tool ◽  
Error Detection ◽  
Experimental Results ◽  
Freeform Surface ◽  
Angle Sensor ◽  
Noncontact Method ◽  
Wide Range ◽  
Array Calibration ◽  
The Mathematical Model ◽  
Composite Module

Freeform surface is one of the research focuses in the measurement field. A composite module is composed of a plane and rotating paraboloid. The composite module array can identify 21 geometric errors of the machine tool in a wide range, which is composed of several composite modules. Eliminating the error of the array itself is of great significance for improving measurement accuracy. For this reason, this paper proposed a noncontact method for calibrating the angle and position of the composite module array. This paper used a self-developed angle sensor to access corresponding information and established the mathematical model according to the freeform surface’s geometric characteristics to achieve calibration. In addition, the influence of array placement error on calibration was analyzed. The experimental results showed that the angle repeatability was within 0.4″ around the X-axis and within 0.3″ around the Y-axis, and the position repeatability was within 0.4 µm in the X direction and within 0.7 µm in the Y direction. The measurement comparison experiments with high-precision laser interferometer and uncalibrated array verified the correctness of the experimental results. This method provides an important reference for practical application and freeform surface array calibration, and creates conditions for the implementation of machine tool error detection.

Design Concept of Composite Module for Nuclear Power Plant Construction

2004 ◽  
Author(s):  
Taihei Yotsuya ◽  
Kouichi Murayama ◽  
Jun Miura ◽  
Akira Nakajima ◽  
Junichi Kawahata
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Large Scale ◽  
Construction Method ◽  
Nuclear Plant ◽  
Small Scale ◽  
Modular Construction ◽  
Plant Construction ◽  
Composite Module

A composite module construction method is to be examined reflecting one of the elements of construction rationalization of a future nuclear plant planned by Hitachi. This concept is based on accomplishments and many successes achieved by Hitachi through application of the modular construction method to nuclear power plant construction over 20 years. The feature of the composite module typically includes a planned civil structure, such as a wall, a floor, and a post, representing modular components. In this way, an increased level of rationalization is expected in the conventional large-scale nuclear plants. Furthermore, the concept aiming at the modularization of all the building parts comprising medium- or small-scale reactors is also to be examined. Additional aims include improved reductions in the construction duration and rationalization through use of the composite module. On the other hand, present circumstances in nuclear plant construction are very pressing because of economic pressures. With this in mind, Hitachi is pursuing additional research into the introduction of drastic construction rationalization, such as the composite module. This concept is one of the keys to successful future plant construction, faced with such a severe situation.

Modular Design Concept of a Humanoid Robot Platform

2013 ◽  
Vol 694-697 ◽  
pp. 1736-1741 ◽  
Author(s):  
Kai Cheng Qi ◽  
Peng Shang ◽  
Wei Liu ◽  
Jian Jun Zhang ◽  
Feng Gao
Keyword(s):  
Knee Joint ◽  
Humanoid Robot ◽  
Modular Design ◽  
Humanoid Robots ◽  
Biped Robots ◽  
Basic Module ◽  
Logic Diagram ◽  
Human Joints ◽  
Composite Module ◽  
Robot Platform

Most of the biped robots or humanoid robots developed so far have been designed with serialactuated mechanism. the ratio between power and weight has not been very good. Some abilities of the humanoid robot are dependent on the weakest motor just like the cannikin law. Most of the human joints are not serial-actuated but parallel-actuated except the knee joint which is a one DOF joint. In the study, two kinds of module are put forward: basic module and composite module, and the configurations of the joints and limbs are designed by these modules. Based on logic diagram, many kinds of the humanoid robot are structured with these joints and limbs. As an applicable example, the humanoid robot SJTU-HR1 is presented.

scholarly journals Composite Module Analyst: identification of transcription factor binding site combinations using genetic algorithm

2006 ◽  
Vol 34 (Web Server) ◽  
pp. W541-W545 ◽  
Author(s):  
T. Waleev ◽  
D. Shtokalo ◽  
T. Konovalova ◽  
N. Voss ◽  
E. Cheremushkin ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Transcription Factor ◽  
Binding Site ◽  
Transcription Factor Binding Site ◽  
Transcription Factor Binding ◽  
Factor Binding Site ◽  
Factor Binding ◽  
Composite Module

An optimization scheme for a multilayer armour module against 7.62 mm armour piercing projectile

2019 ◽  
Vol 11 (2) ◽  
pp. 185-208 ◽  
Author(s):  
Ashish Paman ◽  
Govindan Sukumar ◽  
B Ramakrishna ◽  
Vemuri Madhu
Keyword(s):  
Numerical Simulations ◽  
Response Surface ◽  
Numerical Models ◽  
Minimum Weight ◽  
Performance Parameter ◽  
Design Parameters ◽  
Optimization Scheme ◽  
Ballistic Performance ◽  
Al 2024 ◽  
Composite Module

This study presents a methodology to find the optimal sequence and thicknesses of individual material layers in a multilayer armour module. The methodology is demonstrated with application to three different metal alloys: Armox-500T, Ti-6Al-4V and Al-2024. Numerical simulations are performed first to study the ballistic impact behaviour of these three materials using AUTODYN-3D code. The results of numerical simulations are compared with experimental results for validating the numerical models. Thereafter, a three-layer armour module consisting of these three materials is optimized to defeat 7.62 armour piercing projectile with minimum weight. The optimization process involves carrying a set of numerical simulations based on the design of experiment approach to generate a response surface for the ballistic performance of a composite module. A new ballistic performance parameter is introduced to measure the ballistic response of the module by combining depth of penetration and residual velocity of the projectile to bring uniformity between two cases of partial and complete penetration. The proposed parameter provides more information on ballistic performance. The response surface for ballistic performance parameter is generated in terms of thicknesses for six possible combinations of three material layers. The adequacy of the proposed optimization scheme is confirmed with ballistic experiments. The sequence Armox-500T/Ti-6Al-4V/Al-2024 with thicknesses 5.5, 8.5 and 13 mm, respectively, is found to be the best against 7.62 mm armour piercing projectile. Furthermore, the performance of each individual material is compared with an optimized three-layer armour module. The composite module is found to be weight efficient over Armox-500T, Al-2024 and provides better thickness efficiency over Al-2024. The weight efficiency and thickness efficiency of Ti-6Al-4V are found to be comparable to the composite module. This study emphasizes the necessity of developing new procedures to provide reliable estimates of design parameters for a multilayer armour module.

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