Results 131 to 140 of about 17,826 (249)

Extreme Rhythm Keeping in Long‐Range Slow Click Communication of Sperm Whales

Annals of the New York Academy of Sciences, Volume 1559, Issue 1, May 2026.
In this study, we show that male sperm whales produce low‐frequency slow clicks at low repetition rates with extreme source levels > 200 dB re 1 µPa (pp), making them the loudest mammalian communication signal, with an estimated active space of ∼70 km.
Simone K. A. Videsen, Teresa Raimondi, Pernille M. Sørensen, Michael B. Pedersen, Walter M. X. Zimmer, Nienke C. F. van Geel, Denise Risch, Peter Cook, Stephanie L. King, Andrea Ravignani, Peter T. Madsen   +10 more
wiley   +1 more source

Bimetallic fluid displacement apparatus [PDF]

, 1974
Stirring and heating stored gases and liquids is accomplished by using the deformation of a bimetallic structure which deforms significantly when heated.
Canning, T. N.
core   +1 more source

Automotive Stirling engine development program [PDF]

The major accomplishments were the completion of the Basic Stirling Engine (BSE) and the Stirling Engine System (SES) designs on schedule, the approval and acceptance of those designs by NASA, and the initiation of manufacture of BSE components.
Cronin, M., Ernst, W., Farrell, R., Howarth, R., Meacher, J., Richey, A., Riecke, G., Simetkosky, M., Smith, G.   +8 more
core   +4 more sources

Dynamic Modeling of Inner Processes in Piston (Axial) Pump with Fluid Flow Regulation

Механика машин, механизмов и материалов, 2008
The model mathematics for estimation design parameters of piston (axial) pump with servosystem is proposed. The possibility of estimation influence parameters of pump and servosystem on dynamic features oft hydraulic drive.
M.I. Zhilevich, V.S. Shevchenko
doaj  

The performance and application of high speed long life LH2 hybrid bearings for reusable rocket engine turbomachinery [PDF]

Data are presented for two different experimental programs which were conducted to investigate the characteristics of a hybrid (hydrostatic/ball) bearing operating in liquid hydrogen. The same bearing design was used in both programs.
Hannum, N. P., Nielson, C. E.
core   +1 more source

Condition monitoring of axial piston pumps based on machine learning-driven real-time CFD simulation

Engineering Applications of Computational Fluid Mechanics
Condition monitoring of axial piston pumps is essential for the stable and safe operation of the entire hydraulic system in various electro-hydraulic equipment.
Wentao Wang, Qun Chao, Junjie Shi, Chengliang Liu   +3 more
doaj   +1 more source

Advanced expander test bed program [PDF]

The Advanced Expander Test Bed (AETB) is a key element in NASA's Chemical Transfer Propulsion Program for development and demonstration of expander cycle oxygen/hydrogen engine technology component technology for the next space engine.
Masters, A. I., Mitchell, J. C.
core   +1 more source

Gear Pump Versus Variable Axial Piston Pump in Electro-Hydrostatic Servoactuators

Actuators
This paper presents a comparison of some different configurations of electro-hydrostatic actuators (EHA). The gear pump EHA has a simpler mechanical configuration, but the electronic power command circuits and the electric motor are in high demand due to
Alexandru Dumitrache, Liviu Dinca, Jenica-Ileana Corcau, Adriana Ionescu, Mihai Negru   +4 more
doaj   +1 more source

Lubrication, Friction and Wear Characteristics of Textured Surface Slipper Pairs in Axial Piston Pumps

Lubricants
The study investigates the impact of textured surface parameters and pump operating parameters on the friction performance of slipper pairs in axial piston pumps.
Bin Bian, Zhiqiang Zhang, Lin Li, Qun Chao, Hao Yuan, Zhiqi Liu   +5 more
doaj   +1 more source

On Cavitation of an Axial Piston Pump

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B, 1982
Atsushi YAMAGUCHI, Tetsuo TAKABE
openaire   +2 more sources