Performance Test of Stirling Cooler for Ultra-Low Temperature Application

2021 ◽  
Vol 25 (6) ◽  
pp. 71-77
Author(s):  
Junseok Ko ◽  
Jiho Park ◽  
Hyobong Kim ◽  
Jongwoo Kim ◽  
Sangyoon Choo ◽  
...  
Keyword(s):  
Low Temperature ◽  
Performance Test ◽  
Temperature Application

scholarly journals Research on Performance Test System of Space Harmonic Reducer in High Vacuum and Low Temperature Environment

Machines ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 1
Author(s):  
Jing Wang ◽  
Zhihua Wan ◽  
Zhurong Dong ◽  
Zhengguo Li
Keyword(s):  
Low Temperature ◽  
High Speed ◽  
Performance Test ◽  
High Reliability ◽  
High Vacuum ◽  
Test System ◽  
Low Noise ◽  
Speed Ratio ◽  
Space Harmonic ◽  
Temperature Environment

The harmonic reducer, with its advantages of high precision, low noise, light weight, and high speed ratio, has been widely used in aerospace solar wing deployment mechanisms, antenna pointing mechanisms, robot joints, and other precision transmission fields. Accurately predicting the performance of the harmonic reducer under various application conditions is of great significance to the high reliability and long life of the harmonic reducer. In this paper, a set of automatic harmonic reducer performance test systems is designed. By using the CANOpen bus interface to control the servo motor as the drive motor, through accurately controlling the motor speed and rotation angle, collecting the angle, torque, and current in real time, the life cycle test of space harmonic reducer was carried out in high vacuum and low temperature environment on the ground. Then, the collected data were automatically analyzed and calculated. The test data of the transmission accuracy, backlash, and transmission efficiency of the space harmonic reducer were obtained. It is proven by experiments that the performance data of the harmonic reducer in space work can be more accurately obtained by using the test system mentioned in this paper, which is convenient for further research on related lubricating materials.

scholarly journals Evaluation of Properties and Micro-Characteristics of Waste Polyurethane/Styrene-Butadiene-Styrene Composite Modified Asphalt

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2249
Author(s):  
Bei Chen ◽  
Fuqiang Dong ◽  
Xin Yu ◽  
Changjiang Zheng
Keyword(s):  
Low Temperature ◽  
Performance Test ◽  
Permanent Deformation ◽  
Modified Asphalt ◽  
Basic Performance ◽  
Styrene Butadiene Styrene ◽  
Styrene Butadiene ◽  
Sbs Modified Asphalt ◽  
And Storage ◽  
Butadiene Styrene

In order to solve the problems caused by asphalt diseases and prolong the life cycle of asphalt pavement, many studies on the properties of modified asphalt have been conducted, especially polyurethane (PU) modified asphalt. This study is to replace part of the styrene-butadiene-styrene (SBS) modifier with waste polyurethane (WP), for preparing WP/SBS composite modified asphalt, as well as exploring its properties and microstructure. On this basis, this paper studied the basic performance of WP/SBS composite modified asphalt with a conventional performance test, to analyze the high- and low-temperature rheological properties, permanent deformation resistance and storage stability of WP/SBS composite modified asphalt by dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests. The microstructure of WP/SBS composite modified asphalt was also observed by fluorescence microscope (FM) and Fourier transform infrared spectroscopy (FTIR), as well as the reaction between WP and asphalt. According to the results of this study, WP can replace SBS as a modifier to prepare WP/SBS composite modified asphalt with good low-temperature resistance, whose high-temperature performance will be lower than that of SBS modified asphalt. After comprehensive consideration, 4% SBS content and 15% WPU content (4 S/15 W) are determined as the suitable types of WPU/SBS composite modified asphalt.

scholarly journals Experimental Study on Deformation Behavior and Compressive Strength of Concrete Cast in Steel Tube Arches under Low-Temperature Conditions

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Tuo Shi ◽  
Nianchun Deng ◽  
Xiao Guo ◽  
Wen Xu ◽  
Shi Wang
Keyword(s):  
Compressive Strength ◽  
Low Temperature ◽  
Performance Test ◽  
Large Diameter ◽  
Test Site ◽  
Steel Tube ◽  
Design Strength ◽  
Curing Conditions ◽  
Expansive Agent ◽  
Arch Bridges

Taking the construction of a concrete-filled steel tube (CFST) arch bridge (part of the Sichuan-Tibet Railway) in low temperatures as the test site, firstly the deformation performance test of concrete was carried out. Following this initial testing, measurement of compressive strength and shrinkage performance was conducted in large-diameter CFSTs under a variety of curing conditions. Experimental results showed that the expansion effect of Ca-Mg composite expansive agent in concrete was better than that of other expansive agents at any stage. Under low-temperature curing (0°C), the sampling strength of the large-diameter CFSTs reached 73.5% of the design strength at 28 d in the presence of a nonthermal curing system. The design strength itself was reached, when a curing system involving a thermal insulation film was applied, and use of this film also led to improvements in concrete shrinkage. The results suggested that a Ca-Mg composite expansive agent, combined with an insulation film curing system, should be the technique selected for concrete pumping construction of CFST arch bridges in Tibet.

Epoxies for Low Temperature Application Impregnating Technology

1984 ◽  
pp. 51-60 ◽  
Author(s):  
Heinz Hacker ◽  
Cord Albrecht ◽  
Heinz Laupenmühlen ◽  
Herbert Salzburger ◽  
Walter Ihlein
Keyword(s):  
Low Temperature ◽  
Temperature Application

scholarly journals On the Properties of Steels for Low Temperature Application (Si-Mn Y N D Steel)

1962 ◽  
Vol 31 (2) ◽  
pp. 136-142
Author(s):  
Tadashi Ohtake ◽  
Sadayoshi Morita ◽  
Susumu Goda ◽  
Masao Kanamori ◽  
Toshimasa Okabe ◽  
...  
Keyword(s):  
Low Temperature ◽  
Temperature Application

Calibration of the device simulation program suitable for low-temperature application

1998 ◽  
Author(s):  
Wei-Lee Lu ◽  
Jah-Hwai Ho ◽  
Kun-Fu Tseng ◽  
Ting-Hwan Chang ◽  
Jenn-Gee Lwo ◽  
...  
Keyword(s):  
Low Temperature ◽  
Device Simulation ◽  
Simulation Program ◽  
Temperature Application

Development of highly active coated monolith SCR catalyst with strong abrasion resistance for low-temperature application

2015 ◽  
Vol 9 (6) ◽  
pp. 979-987 ◽  
Author(s):  
Lina Gan ◽  
Shan Lei ◽  
Jian Yu ◽  
Hongtao Ma ◽  
Yo Yamamoto ◽  
...  
Keyword(s):  
Low Temperature ◽  
Abrasion Resistance ◽  
Scr Catalyst ◽  
Highly Active ◽  
Temperature Application

High performance solid-oxide fuel cell: Opening windows to low temperature application

2016 ◽  
Vol 41 (13) ◽  
pp. 5824-5832 ◽  
Author(s):  
Ye Zhang-Steenwinkel ◽  
Qingchun Yu ◽  
Frans P.F. van Berkel ◽  
Marc M.A. van Tuel ◽  
Bert Rietveld ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Low Temperature ◽  
Solid Oxide Fuel Cell ◽  
High Performance ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Temperature Application ◽  
Cell Opening
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