scholarly journals Positioning Performance of a Sub-Arc-Second Micro-Drive Rotary System

Micromachines ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1063
Author(s):  
Manzhi Yang ◽  
Zhenyang Lv ◽  
Chuanwei Zhang ◽  
Yizhi Yang ◽  
Gang Jing ◽  
...  
Keyword(s):  
Reference Value ◽  
Experimental Methods ◽  
Drive System ◽  
Rotary Motion ◽  
Linear Motion ◽  
Kinematics Simulation ◽  
Study Results ◽  
Ultra Precision ◽  
Precision Motion ◽  
Performance Equation

In the macro/micro dual-drive rotary system, the micro-drive system compensates for the position error of the macro-drive system. To realize the sub-arc-second (i.e., level of 1″–0.1″) positioning of the macro/micro dual-drive rotary system, it is necessary to study the positioning performance of the sub-arc-second micro-drive rotary system. In this paper, we designed a sub-arc-second micro-drive rotary system consisting of a PZT (piezoelectric actuator) and a micro rotary mechanism, and used simulation and experimental methods to study the positioning performance of the system. First, the micro-drive rotary system was developed to provide ultra-precise rotary motion. In this system, the PZT has ultrahigh resolution at a level of 0.1 nanometers in linear motion; a micro rotating mechanism was designed according to the composite motion principle of the flexible hinge, which could transform the linear motion of piezoelectric ceramics into rotating motion accurately. Second, the drive performance was analyzed based on the drive performance experiment. Third, kinematics, simulation, and experiments were carried out to analyze the transformation performance of the system. Finally, the positioning performance equation of the system was established based on the two performance equations, and the maximum rotary displacements and positioning error of the system were calculated. The study results showed that the system can provide precision motion at the sub-arc-second and good linearity of motion. This study has a certain reference value in ultra-precision positioning and micromachining for research on rotary motion systems at the sub-arc-second level.

Frost Heaving Soil Road Use Synthetic Adhesive Reinforcement Method

2013 ◽  
Vol 740 ◽  
pp. 759-762
Author(s):  
Hao Zeng Bao
Keyword(s):  
Mechanical Properties ◽  
Industrial Waste ◽  
Construction Materials ◽  
Reference Value ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Experimental Methods ◽  
Frost Heaving ◽  
The World ◽  
Rock And Soil

In many areas, there are still a development road construction materials, traditionally, often use reinforced concrete, asphalt and other adhesive method to strengthen the low strength of rock and soil anti-freeze expansion coefficient; And now all countries in the world are studying how to use industrial production waste development of new composite materials. One of the most development potential, the production of industrial waste - slime. This paper USES the Russian kazan national construction university experimental methods, in the experiment to improve frost heaving soil physical and mechanical properties of the method for the synthesis of adhesive, based on the feasibility and applicability, environmental assessment of research and analysis, for the use of adhesive put forward a lot of reference value.

Sustainable international tourist hotels: the role of the executive chef

2017 ◽  
Vol 29 (7) ◽  
pp. 1873-1891 ◽  
Author(s):  
Tung-Hsuan Wan ◽  
Yun-Shu Hsu ◽  
Jehn-Yih Wong ◽  
Shin-Hao Liu
Keyword(s):  
Delphi Method ◽  
Reference Value ◽  
Competency Framework ◽  
Content Type ◽  
Modified Delphi ◽  
International Tourist ◽  
Study Results ◽  
Critical Competencies ◽  
And Training ◽  
Behavioral Event

Purpose Human capital is the most important determinant of the Hospitality industry’s success. Executive chefs should be skilled in both management and culinary arts, in addition to ensuring the success of the entire hospitality division. The study aims to understand the competencies of executive chefs in international tourist hotels in Taiwan. Design/methodology/approach Literature review and behavioral event interviews were conducted with ten executive chefs and executive sous chefs. The modified Delphi method verified the results using 15 experts. Findings A competency framework was created, with four quadrants – managerial, operational, behaviors and skills – to classify executive chefs’ competencies. Each competency was further divided into sub-competencies – culinary research, emotional control, negotiation skills, job guidance and proactive thinking ability – for 25 items. Quadrants I and II are hard competencies that can be improved through education and training, whereas the third and fourth are soft competencies that require more time for development in workers. Practical implications The two-step study developed a competency framework with a practical reference value. The study results could be utilized by human resources managers during their companies’ training, recruitment, selection and promotion. Originality/value Besides the Delphi method, a deep behavioral event interview that enabled determining critical competencies was also used to collect data. The results obtained could be used to structure schools’ curricula. Collaborations between the hospitality industry and schools could help develop better curricula and training plans to maximize the availability of educational resources.

Applied-Information Technology in Willingness of Online Group Buying for College Students

2014 ◽  
Vol 685 ◽  
pp. 540-544
Author(s):  
Xiao Ting Li ◽  
Lin Zhong ◽  
Shou Wen Ji
Keyword(s):  
College Students ◽  
College Student ◽  
Theoretical Study ◽  
Influence Factors ◽  
Reference Value ◽  
Group Buying ◽  
Study Results ◽  
Management Recommendations ◽  
Online Group ◽  
Operation And Management

As a new e-commerce model, network group purchase develops rapidly for its advantages such as conservation and convenience. The college student is an important part of consumer of the online group buying, so the research on college student willingness has a important reference value for the expansion of market. Firstly, the article has a theoretical study on the influence factors of willingness of Online Group Buying for college students and carries out related questionnaires. Secondly, the article makes factor analysis, correlation analysis, multiple regression analysis using the statistical software of SPSS19.0. Finally, this paper proposes corresponding operation and management recommendations for relevant participants in online group-buying according to the study results.

Simultaneous optimization in ultra-precision motion systems

2019 ◽  
Vol 59 (6) ◽  
pp. 2273-2285
Author(s):  
Jing Wang ◽  
Ming Zhang ◽  
Yu Zhu ◽  
Kaiming Yang ◽  
Xin Li ◽  
...  
Keyword(s):  
Simultaneous Optimization ◽  
Ultra Precision ◽  
Precision Motion

Integrated Optimization of Structure and Control in Ultra-Precision Motion Systems

2019 ◽  
Author(s):  
Jing Wang ◽  
Ming Zhang ◽  
Yu Zhu ◽  
Xin Li ◽  
Leijie Wang
Keyword(s):  
Complex Dynamics ◽  
System Level ◽  
Structural Topology ◽  
Worst Case ◽  
Integrated Optimization ◽  
Motion System ◽  
Material Interpolation ◽  
Ultra Precision ◽  
Precision Motion ◽  
And Control

Abstract Ever-increasing demands for precision and efficiency in ultra-precision motion systems will result in a lightweight and flexible motion system with complex dynamics. In this paper, a systematic approach is proposed where control gains, 3D structural topology and actuator configuration are integrated into optimization to derive a system-level optimal design which possesses a high vibration control performance, and still satisfies multiple design constraints. A material interpolation model with high accuracy is proposed for the integrated optimization, a simple integral equation utilizing R-functions and level-set functions is established to represent complex non-overlapping constraints of actuators. Over-actuation degrees are utilized to actively control the dominant flexible modes. Responses of residual flexible modes are restricted by increasing the coincidence of their nodal areas at actuators (sensors) locations. The objective function is the constructed worst-case vibration energy of the flexible modes. A dual-loop solving strategy combining the genetic algorithm and the modified optimal criteria method is adopted to solve the optimization problem. A fine stage in the wafer stage is designed to prove the effectiveness of the proposed method.

Measurement of Five DOF Motion Errors in the Ultra Precision Feed Tables

2006 ◽  
Vol 505-507 ◽  
pp. 187-192 ◽  
Author(s):  
Yoon Jin Oh ◽  
Chun Hong Park ◽  
J.H. Hwang ◽  
Deug Woo Lee
Keyword(s):  
Degrees Of Freedom ◽  
Laser Interferometer ◽  
Point Method ◽  
Straight Edge ◽  
Roll Motion ◽  
Error Measurement ◽  
Linear Motion ◽  
Pitch Motion ◽  
Ultra Precision ◽  
Measuring Scheme

Five degrees-of-freedom (DOF) motion errors of an ultra precision feed table were measured in this study. The laser interferometer was used to measure the yaw and pitch errors and the reversal method was used for the roll error measurement. The linear motion errors in the vertical and horizontal directions were measured using the sequential two point method. The influence of angular motion errors on the linear motion errors while applying the sequential two point method was compensated with the data from the laser interferometer and the reversal method. Capacitive type sensors and an optical straight edge were used while applying the reversal method and the sequential two point method. To demonstrate the effectiveness of our measuring scheme for the ultra precision feed tables, five DOF motion errors of a hydrostatic table driven by a linear motor were measured and presented. From the measured repeatabilities of 5 DOF error motions, it was estimated that the measuring accuracies were ±0.02 μm for the horizontal and vertical linear motion, ±0.04 arcsec for yaw motion, ±0.05 arcsec for pitch motion and ±0.02 arcsec for roll motion.

Structural Analysis of a Grinding Machine with Linear Motion Guide Applied

2013 ◽  
Vol 336-338 ◽  
pp. 1014-1019
Author(s):  
Seon Yeol Oh ◽  
Han Seok Bang ◽  
B. Y. Choi ◽  
Woo Chun Choi ◽  
S. J. Cho
Keyword(s):  
Finite Element ◽  
Structural Analysis ◽  
Structural Design ◽  
Element Model ◽  
Linear Motion ◽  
Precision Grinding ◽  
Base Side ◽  
Ultra Precision ◽  
Linear Motion Guide ◽  
Grinding Machine

A finite element model of an ultra-precision grinding machine that can have high precision and high stiffness is constructed and structural analysis is done with equivalent stiffnesses of linear motion guides by after structural design and the deformation of the grinding machine is obtained. In order to reduce the deformation of the grinding machine that causes bad influence, structural complement is conducted by adding ribs at the lower part of the column. Also, the straightness of the grinding machine is improved by lifting that the base side of the column.

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