Low cost split stirling cryogenic cooler for aerospace applications

2012 ◽  
Author(s):  
Alexander Veprik ◽  
Semeon Zechtzer ◽  
Nachman Pundak ◽  
Sergey Riabzev ◽  
C. Kirckconnel ◽  
...  
Keyword(s):  
Low Cost ◽  
Aerospace Applications ◽  
Cryogenic Cooler

Adaptation of the low-cost and low-power tactical split Stirling cryogenic cooler for aerospace applications

2011 ◽  
Author(s):  
A. Veprik ◽  
S. Zechtzer ◽  
N. Pundak ◽  
C. Kirkconnell ◽  
J. Freeman ◽  
...  
Keyword(s):  
Low Power ◽  
Low Cost ◽  
Aerospace Applications ◽  
Cryogenic Cooler

A Novel Low-Cost TMR-Without-Voter Based HIS-Insensitive and MNU-Tolerant Latch Design for Aerospace Applications

2020 ◽  
Vol 56 (4) ◽  
pp. 2666-2676
Author(s):  
Aibin Yan ◽  
Zhelong Xu ◽  
Kang Yang ◽  
Jie Cui ◽  
Zhengfeng Huang ◽  
...  
Keyword(s):  
Low Cost ◽  
Aerospace Applications

Low vibration microminiature split Stirling cryogenic cooler for infrared aerospace applications

2012 ◽  
Author(s):  
Alexander Veprik ◽  
Semeon Zechtzer ◽  
Nachman Pundak ◽  
Sergey Riabzev ◽  
Carl Kirckonnel ◽  
...  
Keyword(s):  
Aerospace Applications ◽  
Cryogenic Cooler

scholarly journals Experimental Study of Visual Corona under Aeronautic Pressure Conditions Using Low-Cost Imaging Sensors

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 411 ◽  
Author(s):  
Jordi-Roger Riba ◽  
Álvaro Gómez-Pau ◽  
Manuel Moreno-Eguilaz
Keyword(s):  
Experimental Study ◽  
High Voltage ◽  
Low Cost ◽  
Partial Discharge ◽  
Radio Interference ◽  
Uv Spectrum ◽  
Aerospace Applications ◽  
Low Levels ◽  
Imaging Sensors ◽  
Imaging Sensor

Visual corona tests have been broadly applied for identifying the critical corona points of diverse high-voltage devices, although other approaches based on partial discharge or radio interference voltage measurements are also widely applied to detect corona activity. Nevertheless, these two techniques must be applied in screened laboratories, which are scarce and expensive, require sophisticated instrumentation, and typically do not allow location of the discharge points. This paper describes the detection of the visual corona and location of the critical corona points of a sphere-plane gap configurations under different pressure conditions ranging from 100 to 20 kPa, covering the pressures typically found in aeronautic environments. The corona detection is made with a low-cost CMOS imaging sensor from both the visible and ultraviolet (UV) spectrum, which allows detection of the discharge points and their locations, thus significantly reducing the complexity and costs of the instrumentation required while preserving the sensitivity and accuracy of the measurements. The approach proposed in this paper can be applied in aerospace applications to prevent the arc tracking phenomenon, which can lead to catastrophic consequences since there is not a clear protection solution, due to the low levels of leakage current involved in the pre-arc phenomenon.

Demonstration of an Integrated Micro Cryogenic Cooler and Miniature Compressor for Cooling to 200 K

2011 ◽  
Author(s):  
Ryan Lewis ◽  
M.-H. Lin ◽  
Yunda Wang ◽  
Jill Cooper ◽  
Peter Bradley ◽  
...  
Keyword(s):  
Low Cost ◽  
Glass Fibers ◽  
Check Valve ◽  
Coefficient Of Performance ◽  
Hydrocarbon Mixture ◽  
Counter Flow ◽  
Valve Assembly ◽  
Glass Chip ◽  
Flow Heat ◽  
Cryogenic Cooler

Joule-Thompson (J-T) based micro cryogenic coolers (MCCs) are attractive because they can provide the cryogenic temperatures needed for small electronic devices while having a low cost and small volumetric footprint. A compressor is a major part of a cryogenic system, but so far J-T based MCCs have not used miniature or micro scale compressors. This work demonstrates a J-T based MCC coupled with a miniature compressor for cooling to 200 K, using a custom hydrocarbon mixture as refrigerant. The compressor is formed by coupling a miniature piston oscillator built for Stirling coolers with a micromachined check valve assembly. The MCC is formed by glass fibers within a capillary forming a counter flow heat exchanger, and a silicon and glass chip forming a J-T valve. Minimum temperatures of 166 K have been observed in transient, and stable temperatures of 200 ±1 K have been observed for >1 hour. Some insight is given into the unstable performance in terms of intermittent liquid accumulation. The coefficient of performance is analyzed for the system, and it is found that most of the inefficiencies arise at the compressor.

Novel phthalonitrile-based composites with excellent processing, thermal, and mechanical properties

2017 ◽  
Vol 30 (6) ◽  
pp. 720-730 ◽  
Author(s):  
Zuoqiang Wu ◽  
Shijie Wang ◽  
Lishuai Zong ◽  
Nan Li ◽  
Jinyan Wang ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Bending Strength ◽  
Low Cost ◽  
Nitrogen Atmosphere ◽  
Gravimetric Analysis ◽  
Fiber Reinforced ◽  
Aryl Ether ◽  
Scanning Calorimetry ◽  
Aerospace Applications ◽  
Interlaminar Shear

Phthalonitrile resins exhibit excellent thermostability and mechanical strength after curing. However, poor processability made them difficult to fabricate fiber-reinforced composites with desirable integrated performance. In this article, a novel mixed phthalonitrile resin was developed to be used as the matrix for glass fiber–reinforced laminates. Poly (aryl ether nitrile phthalazinone) oligomer end-capped by phthalonitrile units (PPEN-PN) was firstly designed and blended with bisphenol-based phthalonitrile monomers (BP-PN) (Figure 1), which were obtained according to the literature procedure. A novel mixed curing agent (zinc chloride and 4,4-diamine-diphenylsulfone) was also exploited to accelerate curing rate of the resins. Solubility tests, differential scanning calorimetry and rheological studies revealed that the mixed resins exhibited good processability with low processing viscosity. Thermal gravimetric analysis indicated that the cured resins were stable below 530 to approximately 570 °C in nitrogen atmosphere after low-cost curing procedure. In air, char yields of the resins were between 30 to approximately 40% when heated to 800 °C. The laminates reinforced by E-glass fiber cloth possessed a bending strength of 668 MPa with interlaminar shear strength of 84.6 MPa at room temperature. 50% of the strength and modulus was maintained when heated to 400 °C. Consequently, this type of laminates may be potential candidates for aerospace applications.

scholarly journals Economics and Design Approaches for Small Commercial Turbogenerators

1997 ◽  
Author(s):  
Phillip F. Myers
Keyword(s):  
Material Selection ◽  
Low Cost ◽  
High Volume ◽  
Integrated Approach ◽  
Organizational Setting ◽  
Successful Development ◽  
Aerospace Applications ◽  
High Volume Production ◽  
Volume Production ◽  
Almost All

The successful development of small commercial turbogenerators for automotive and other applications presents a major economic challenge. Current aerospace turbogenerators in the 60 kilowatt power range sell for around $500 per kilowatt. Volume automotive turbogenerators prices must be $30 per kilowatt, or less — a 94% reduction. Turbogenerators for aerospace applications have drastically different requirements on almost all important criteria from automotive turbogenerators. The production of commercial turbogenerators requires a radically different organizational setting, mindset, and overhead structure from that necessary for the aerospace industry. Ground up designs which take an integrated approach to material selection, method of operation, fabrication techniques, supplier base, assembly methods, and low cost overheads will be necessary for commercial success. Significant innovation and simplification, and the natural effects of high volume production are also required. Success will likely require lean, agile, innovative, and specialized organizations.

Construction of a plastomer for the analysis of polypropylene fluidity under different temperatures and use of additives

2020 ◽  
Vol 2 (7) ◽  
pp. 1-7
Author(s):  
Juliano Frizzo
Keyword(s):  
Free Volume ◽  
Low Cost ◽  
Raw Material ◽  
Daily Lives ◽  
Melt Index ◽  
Aerospace Applications ◽  
Plastic Materials ◽  
Different Temperatures ◽  
Industrial Use

A low-cost plastomer was built and analyzed the main factors that can improve its fluidity, such as the use of different specifications and additives. Thermoplastics are materials currently used everywhere, from simple applications such as making toys to aerospace applications. Among the usual thermoplastics in our daily lives we have polypropylene, widely used as raw material for the manufacture of various plastic materials. One of the factors that most interferes with the quality of PP in industrial use is its fluidityindex, measured by the use of plastomer, an extremely expensive equipment. From the analysis of various temperatures and percentages of additives it was possible to identify factors that improve its fluidity, improving industrial applicability. It is concluded that there is a direct relationship between the increase in the melt index (fluidity index) of the melt and the increase in temperature and additives by up to 1%, emphasizing that with 2% worse results can be obtained from the IF. This increase in the bottom IF can be explained by the theory of free volume, where the higher the temperature, the greater the free volume between the molecules and the lower their viscosity, that is, the easier their flow will be. 

scholarly journals Design and Implementation of a 3-Dimensional Attitudes Estimator Device using Low Cost Accelerometer & Gyroscope with Microcontroller IDE

2020 ◽  
Vol 12 (2) ◽  
pp. 151-161
Author(s):  
M. RAJA ◽  
Ugur GUVEN ◽  
Kartikay SINGH
Keyword(s):  
Dimensional Space ◽  
Low Cost ◽  
Three Dimensional ◽  
3 Dimensional ◽  
Aerospace Applications ◽  
Vector Quantity ◽  
Measurement Units ◽  
Fixed Axis ◽  
The Stability ◽  
Three Dimensional Space

Navigation and guidance systems for most automobile as well as aerospace applications require a coupled chip setup known as Inertial Measurement Units (IMU) which, depending on the degree of freedoms, contains a Gyroscope (for maintaining orientation and angular velocity), Accelerometers (to determine acceleration in the respective direction) and a Magnetometer (to determine the respective magnetic fields). In the three-dimensional space, any required rotation analysis is limited to the coordinate systems and all subtended angles in either direction must be defined by a fixed axis to effectively estimate the stability and to define all the attitude estimates needed to compile different rotations and orientations. The Quaternions are mathematical notations used for defining rotations and orientation in three-dimensional space. The simplest terms Quaternions are impossible to visualize in a three-dimensional space; the first three terms will be identical to the coordinate system, but through Quaternions another vector quantity is added into the equations, which may in fact underline how we can account for all rotational quantities. The fundamental analysis of these components different applications for various fields is proposed.

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