Theoretical analysis and experimental verification of a new dynamic test method for solar collectors

Calculate and analyze the frequency of the simple box girder based on the unfinished Ba gong River Bridge. The frequency values which were obtained by dynamic test method and theoretical analysis method were compared in this paper. The results showed that the measured values of dynamic test method are close to the results of theoretical analysis, the error is within permissible range, so dynamic test method is suitable for measuring the frequency of simply-supported box girder.

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Research on the Ink Absorption Test Method of High Reflectivity Paper

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.262.401 ◽

2012 ◽

Vol 262 ◽

pp. 401-404

Author(s):

Qin Wen Wang ◽

Shi Yu Fu ◽

Gang Chen

Keyword(s):

Theoretical Analysis ◽

Experimental Verification ◽

Test Method ◽

Absorption Test ◽

High Reflectivity ◽

Key Characteristics

Based on the Vacuum Aluminized Paper, this thesis mainly researches the ink absorption test method of high reflectivity paper. It demonstrates the ordinary K&N method which use whiteness meter to measure the paper reflectivity is not applicable to the Vacuum Aluminized Paper, which by means of combination of theoretical analysis and experimental verification. And through analyzing its key characteristics, the K&N absorption test method has been improved and final use glossiness meter with 45°angle to measure the paper reflectivity and use K&N index to represent the ink absorption ability. This method can be used in high reflectivity paper, such as Vacuum Aluminized Paper, and the K&N index can relatively truly response the ink absorption ability. Our experiments show that the improved K&N absorption test method can accurately measuring the ink absorbency of high reflectivity paper.

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Investigation of Thermal Performance of Flat Plate and Evacuated Tubular Solar Collectors According to a New Dynamic Test Method

Energy Procedia ◽

10.1016/j.egypro.2012.11.019 ◽

2012 ◽

Vol 30 ◽

pp. 152-161 ◽

Cited By ~ 6

Author(s):

Weiqiang Kong ◽

Zhifeng Wang ◽

Jianhua Fan ◽

Bengt Perers ◽

Ziqian Chen ◽

...

Keyword(s):

Flat Plate ◽

Thermal Performance ◽

Dynamic Test ◽

Test Method ◽

Solar Collectors

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An improved dynamic test method for solar collectors

Solar Energy ◽

10.1016/j.solener.2012.03.002 ◽

2012 ◽

Vol 86 (6) ◽

pp. 1838-1848 ◽

Cited By ~ 25

Author(s):

Weiqiang Kong ◽

Zhifeng Wang ◽

Jianhua Fan ◽

Peder Bacher ◽

Bengt Perers ◽

...

Keyword(s):

Dynamic Test ◽

Test Method ◽

Solar Collectors

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Theoretical Analysis and Experimental Verification on High-Isolation Surface-Acoustic-Wave Duplexer with On-Chip Compensation Circuit

IEICE Transactions on Electronics ◽

10.1587/transele.2018ecp5075 ◽

2019 ◽

Vol E102.C (10) ◽

pp. 748-755

Author(s):

Masafumi IWAKI ◽

Masanori UEDA ◽

Yoshio SATOH

Keyword(s):

Theoretical Analysis ◽

Acoustic Wave ◽

Surface Acoustic Wave ◽

Experimental Verification ◽

Compensation Circuit ◽

High Isolation ◽

On Chip

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Concept and Realization of a Novel Test Method Using a Dynamic Test Stand for Detecting Persons by Sensor Systems on Autonomous Agricultural Robotics

Sensors ◽

10.3390/s21072315 ◽

2021 ◽

Vol 21 (7) ◽

pp. 2315

Author(s):

Christian Meltebrink ◽

Tom Ströer ◽

Benjamin Wegmann ◽

Cornelia Weltzien ◽

Arno Ruckelshausen

Keyword(s):

Environmental Conditions ◽

Dynamic Test ◽

Test Methods ◽

Test Stand ◽

Human Detection ◽

Test Method ◽

Sensor Systems ◽

Functional Safety ◽

Agricultural Robots ◽

Agricultural Robotics

As an essential part for the development of autonomous agricultural robotics, the functional safety of autonomous agricultural machines is largely based on the functionality and robustness of non-contact sensor systems for human protection. This article presents a new step in the development of autonomous agricultural machine with a concept and the realization of a novel test method using a dynamic test stand on an agricultural farm in outdoor areas. With this test method, commercially available sensor systems are tested in a long-term test around the clock for 365 days a year and 24 h a day on a dynamic test stand in continuous outdoor use. A test over a longer period of time is needed to test as much as possible all occurring environmental conditions. This test is determined by the naturally occurring environmental conditions. This fact corresponds to the reality of unpredictable/determinable environmental conditions in the field and makes the test method and test stand so unique. The focus of the developed test methods is on creating own real environment detection areas (REDAs) for each sensor system, which can be used to compare and evaluate the autonomous human detection of the sensor systems for the functional safety of autonomous agricultural robots with a humanoid test target. Sensor manufacturers from industry and the automotive sector provide their sensor systems to have their sensors tested in cooperation with the TÜV.

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A Dynamic Test of Fully Prestressed Concrete Beams

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.368-373.2483 ◽

2011 ◽

Vol 368-373 ◽

pp. 2483-2490

Author(s):

Yao Ting Zhang ◽

Yi Zheng ◽

Hong Jian Li

Keyword(s):

Experimental Data ◽

Elastic Modulus ◽

Theoretical Analysis ◽

Natural Frequency ◽

Axial Force ◽

Prestressed Concrete ◽

Concrete Beams ◽

Dynamic Test ◽

Modified Formula

A dynamic test of two unbonded fully prestressed concrete beams has been conducted. The results indicate that the natural frequency of beams increases with the prestress force, which is opposite to the analytical arguments for homogeneous and isotropic beams subject to axial force. This paper explains the change in frequencies by discussing the change in the elastic modulus. A modified formula is also proposed, and the experimental data agree well with the theoretical analysis.

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