scholarly journals Application of light weight metal material on high speed car vehicles

2021 ◽  
Vol 71 (6) ◽  
pp. 258-263
Author(s):  
Hisashi Mori ◽  
Tadashi Minoda ◽  
Mai Takaya ◽  
Satoshi Miyazaki ◽  
Koji Ichitani ◽  
...  
Keyword(s):  
High Speed ◽  
Light Weight ◽  
Metal Material

scholarly journals A High-Speed, Light-Weight Scalar Magnetometer Bird for km Scale UAV Magnetic Surveying: On Sensor Choice, Bird Design, and Quality of Output Data

2021 ◽  
Vol 13 (4) ◽  
pp. 649
Author(s):  
Arne Døssing ◽  
Eduardo Lima Simoes da Silva ◽  
Guillaume Martelet ◽  
Thorkild Maack Rasmussen ◽  
Eric Gloaguen ◽  
...  
Keyword(s):  
High Speed ◽  
Large Scale ◽  
Signal To Noise Ratio ◽  
Regional Scale ◽  
Weather Conditions ◽  
Light Weight ◽  
Output Data ◽  
Efficient Manner ◽  
Flexible System ◽  
Scalar Data

Magnetic surveying is a widely used and cost-efficient remote sensing method for the detection of subsurface structures at all scales. Traditionally, magnetic surveying has been conducted as ground or airborne surveys, which are cheap and provide large-scale consistent data coverage, respectively. However, ground surveys are often incomplete and slow, whereas airborne surveys suffer from being inflexible, expensive and characterized by a reduced signal-to-noise ratio, due to increased sensor-to-source distance. With the rise of reliable and affordable survey-grade Unmanned Aerial Vehicles (UAVs), and the developments of light-weight magnetometers, the shortcomings of traditional magnetic surveying systems may be bypassed by a carefully designed UAV-borne magnetometer system. Here, we present a study on the development and testing of a light-weight scalar field UAV-integrated magnetometer bird system (the CMAGTRES-S100). The idea behind the CMAGTRES-S100 is the need for a high-speed and flexible system that is easily transported in the field without a car, deployable in most terrain and weather conditions, and provides high-quality scalar data in an operationally efficient manner and at ranges comparable to sub-regional scale helicopter-borne magnetic surveys. We discuss various steps in the development, including (i) choice of sensor based on sensor specifications and sensor stability tests, (ii) design considerations of the bird, (iii) operational efficiency and flexibility and (iv) output data quality. The current CMAGTRES-S100 system weighs ∼5.9 kg (including the UAV) and has an optimal surveying speed of 50 km/h. The system was tested along a complex coastal setting in Brittany, France, targeting mafic dykes and fault contacts with magnetite infill and magnetite nuggets (skarns). A 2.0 × 0.3 km area was mapped with a 10 m line-spacing by four sub-surveys (due to regulatory restrictions). The sub-surveys were completed in 3.5 h, including >2 h for remobilisation and the safety clearance of the area. A noise-level of ±0.02 nT was obtained and several of the key geological structures were mapped by the system.

Suppression of Internal Damping-Induced Instability Using Adaptive Techniques

2007 ◽  
Author(s):  
Andra´s Simon ◽  
George Flowers
Keyword(s):  
Composite Materials ◽  
Simulation Modeling ◽  
High Speed ◽  
High Strength ◽  
Light Weight ◽  
Internal Damping ◽  
Modeling And Analysis ◽  
Rotor Systems ◽  
Rotor Spinning ◽  
High Speeds

Advanced rotor systems, for such applications as high-speed flywheel systems, consist (in a basic fashion) of a lightweight rotor spinning at relatively high speeds and supported by magnetic bearings. Composite materials are an extremely attractive choice for such rotor designs, offering high strength with light-weight. However, there are a number of issues that must be addressed for such efforts to be successful. Specific issues include imbalance control and active techniques to suppress internal damping-induced instability. A detailed description of the problem being considered and a strategy for solving it are presented. Simulation modeling and analysis results are presented and discussed to illustrate the method and demonstrate its effectiveness.

scholarly journals Performance and Internal Flow of a Dental Air Turbine Handpiece

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Yasuyuki Nishi ◽  
Hikaru Fushimi ◽  
Kazuo Shimomura ◽  
Takeshi Hasegawa
Keyword(s):  
Driving Force ◽  
High Speed ◽  
Performance Test ◽  
Internal Flow ◽  
Light Weight ◽  
Air Turbine ◽  
High Speed Rotation ◽  
Speed Rotation ◽  
Close Distance ◽  
Turbine Output

An air turbine handpiece is a dental abrasive device that rotates at high speed and uses compressed air as the driving force. It is characterized by its small size, light weight, and painless abrading due to its high-speed rotation, but its torque is small and noise level is high. Thus, to improve the performance of the air turbine handpiece, we conducted a performance test of an actual handpiece and a numerical analysis that modeled the whole handpiece; we also analyzed the internal flow of the handpiece. Results show that experimental and calculated values were consistent for a constant speed load method with the descending speed of 1 mm/min for torque and turbine output. When the tip of the blade was at the center of the nozzle, the torque was at its highest. This is likely because the jet from the nozzle entered the tip of the blade from a close distance that would not reduce the speed and exited along the blade.

High Speed Machining Method of Large-Size Precision Freeform Mirror

2014 ◽  
Vol 1017 ◽  
pp. 340-343 ◽  
Author(s):  
Okiharu Kirino ◽  
Hiroyuki Nakagawa ◽  
Shigeru Kirino ◽  
Hirokazu Kataza
Keyword(s):  
High Speed ◽  
Outer Space ◽  
Space Use ◽  
Diamond Turning ◽  
High Speed Machining ◽  
Light Weight ◽  
Large Size ◽  
Rotationally Symmetric ◽  
Key Factor ◽  
Ultra Precision

This study describes the non-rotationally symmetric diamond turning (XZC turning) for producing large-size precision freeform mirror. This is a high speed machining method as compared with the traditional XYZ diamond milling or fly-cutting. Moreover, the application of this method is a key factor in the development of the ultra-precision light-weight freeform mirror for outer space use. This report introduces these cutting-edge approaches.

SiR Insulation for Outdoor Insulator

2017 ◽  
pp. 57-113
Keyword(s):  
Discharge Current ◽  
High Speed ◽  
Laboratory Tests ◽  
Electrical Strength ◽  
Surface Discharge ◽  
Contact Method ◽  
Light Weight ◽  
Hydrophobic Properties ◽  
Acoustic Characteristics ◽  
Accurate Evaluation

Silicone rubber (SiR) insulators were employed in power system due to its light weight, high electrical strength and excellent contamination performance. Much attention has been paid on the accurate evaluation of the insulator hydrophobicity. In this chapter, the acoustic characteristics of surface discharge were investigated to evaluate the hydrophobic properties of SiR insulator at different ageing degrees. The obtained results indicate that the acoustic characteristic of discharge is sensitive to the hydrophobic properties in the laboratory tests, which can be applied as a non-contact method for hydrophobicity evaluation of SiR insulator. Besides, the surface charge behaviors considering the hydrophobic properties of SiR insulator were discussed. The droplet experiment was carried out to investigate the maximum value, cumulative charge and energy eigenvector of discharge current. Finally, considering the strong airflow for SiR insulators employed in high-speed railway, the hydrophobic properties and corona discharge properties were investigated in this chapter.

A Survey of Light-Weight Protocols for High-Speed Networks

1994 ◽  
pp. 3-28 ◽  
Author(s):  
W. A. Doeringer ◽  
H. D. Dykeman ◽  
M. Kaiserswerth ◽  
B. W. Meister ◽  
H. Rudin ◽  
...  
Keyword(s):  
High Speed ◽  
Light Weight ◽  
High Speed Networks
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