A model based method for centering double ball bar test results preventing fictitious ovalization effects

Due to the target ship in the traditional ship handling simulator have not the ability to give way to other ships automatically to avoid collision, this paper put forward a new idea that bringing the hydraulic servo platform, six degrees of freedom ship mathematical model, the actual traffic flow, researching achievement of automatic anti-collision in research of the new pattern ship handling simulator, and successfully develop the Intelligent Ship Handling Simulator(ISHS for short). The paper focuse on the research on the network communication model of ISHS. We took the entire simulator system as three relatively independent networks, proposed a framework of communication network that combined IOCP model based on TCP with blocking model based on UDP, and gave the communication process and protocols of system. Test results indicate that this is an effective way to improve the ownship capacity of ship handling simulator and meet the need of multi-ownship configuration of desktop system of ship handling simulator.

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Robust measurement method and uncertainty analysis for position-independent geometric errors of a rotary axis using a double ball-bar

International Journal of Precision Engineering and Manufacturing ◽

10.1007/s12541-013-0032-z ◽

2013 ◽

Vol 14 (2) ◽

pp. 231-239 ◽

Cited By ~ 51

Author(s):

Kwang-Il Lee ◽

Seung-Han Yang

Keyword(s):

Uncertainty Analysis ◽

Measurement Method ◽

Geometric Errors ◽

Rotary Axis ◽

Double Ball Bar ◽

Ball Bar

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Identification of Optimized Cranial Bone Constitutive Model Parameters at High Strain Rate Using Polymeric Split Hopkinson Pressure Bar Test Results

10.1007/978-3-030-86446-0_3 ◽

2021 ◽

pp. 19-26

Author(s):

Shiri Seddik ◽

Halgrin Julien

Keyword(s):

Constitutive Model ◽

High Strain Rate ◽

Split Hopkinson Pressure Bar ◽

Cranial Bone ◽

Model Parameters ◽

Test Results ◽

Hopkinson Pressure Bar ◽

Split Hopkinson ◽

Bar Test ◽

Pressure Bar

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Investigation of rotary axes geometric performance of a five-axis machine tool using a double ball bar through dual axes coordinated motion

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-019-03772-5 ◽

2019 ◽

Vol 103 (9-12) ◽

pp. 3943-3952 ◽

Cited By ~ 3

Author(s):

Xiaogeng Jiang ◽

Liang Wang ◽

Chang Liu

Keyword(s):

Machine Tool ◽

Coordinated Motion ◽

Rotary Axes ◽

Double Ball Bar ◽

Ball Bar ◽

Five Axis

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A Complete, Continuous, and Minimal Product of Exponentials-Based Model for Five-Axis Machine Tools Calibration With a Single Laser Tracker, an R-Test, or a Double Ball-Bar

Journal of Manufacturing Science and Engineering ◽

10.1115/1.4042582 ◽

2019 ◽

Vol 141 (4) ◽

Cited By ~ 2

Author(s):

Peng Xu ◽

Benny C. F. Cheung ◽

Bing Li

Keyword(s):

Machine Tool ◽

Machine Tools ◽

Rigid Bodies ◽

Error Model ◽

Laser Tracker ◽

Calibration Model ◽

Transformation Matrices ◽

Double Ball Bar ◽

Ball Bar ◽

Five Axis

Calibration is an important way to improve and guarantee the accuracy of machine tools. This paper presents a systematic approach for position independent geometric errors (PIGEs) calibration of five-axis machine tools based on the product of exponentials (POE) formula. Instead of using 4 × 4 homogeneous transformation matrices (HTMs), it establishes the error model by transforming the 6 × 1 error vectors of rigid bodies between different frames resorting to 6 × 6 adjoint transformation matrices. A stable and efficient error model for the iterative identification of PIGEs should satisfy the requirements of completeness, continuity, and minimality. Since the POE-based error models for five-axis machine tools calibration are naturally complete and continuous, the key issue is to ensure the minimality by eliminating the redundant parameters. Three kinds of redundant parameters, which are caused by joint symmetry information, tool-workpiece metrology, and incomplete measuring data, are illustrated and explained in a geometrically intuitive way. Hence, a straightforward process is presented to select the complete and minimal set of PIGEs for five-axis machine tools. Based on the established unified and compact error Jacobian matrices, observability analyses which quantitatively describe the identification efficiency are conducted and compared for different kinds of tool tip deviations obtained from several commonly used measuring devices, including the laser tracker, R-test, and double ball-bar. Simulations are conducted on a five-axis machine tool to illustrate the application of the calibration model. The effectiveness of the model is also verified by experiments on a five-axis machine tool by using a double ball-bar.

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An Evaluation of Shrinkage Model Based upon Microstructure of Blended Cement Pastes

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.539.44 ◽

2013 ◽

Vol 539 ◽

pp. 44-48

Author(s):

Yi Chen ◽

Wu Yao ◽

Dan Jin

Keyword(s):

Mechanical Testing ◽

Blended Cement ◽

Test Results ◽

Absorption Method ◽

Nitrogen Absorption ◽

Cement Pastes ◽

Model Based

As shrinkage in concrete leading to the subsequent cracking and reducing durability, the study on shrinkage is quite important. Based on microstructure of pores obtained from Nitrogen absorption method and mechanical testing, a numerical shrinkage model was built. The standard shrinkage test results show consistent in the blended cement pastes with different water-to-cement ratioand admixture content to predict shrinkage values, which confirmes the shrinkage model based upon microstructure of blended cement pastes.

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