Results 91 to 100 of about 891,158 (301)

Reduction of torque pulsation in ultralight helicopter transmission

Acta Polytechnica
Usually, 1–2 seats helicopters use piston engines. One of their disadvantages is a significant torque pulsation on the engine shaft. The main reason for such fluctuations is the change in parameters during the engine’s operating cycle.
Vitaly Dudnik
doaj   +1 more source

Helicopters as a Theme in a Machine Design Course [PDF]

, 2014
Helicopters as a Theme in Teaching Machine Design A machine design course is required in most undergraduate mechanical engineering curricula.This course generally covers an introduction to mechanical engineering design, a review of materials engineering,
Nagurka, Mark L., Turner, Devin
core   +1 more source

Engine/airframe interface dynamics experience [PDF]

Problems of engine/drive system torsional stability, engine and output shaft critical speeds, and engine vibration at helicopter rotor order frequencies are discussed, and test data and analyses presented.
Fredrickson, C.
core   +1 more source

Kesediaan pelajar dari aspek kemahiran teknikal terhadap pembentukan kebolehkerjaan di Kolej Vokasional Wilayah Selatan [PDF]

, 2015
Graduan yang menganggur terus menjadi masalah yang semakin meruncing di Malaysia. Terdapat majikan yang menganggap kompetensi akademik sahaja tidak mencukupi dan mula meminta institusi pendidikan tinggi untuk menghasilkan graduan yang dilengkapi ...
Hanafi., Suhaili
core  

Thermo-mechanical stress analysis of the turbine of helicopter engine

, 2016
In this paper the results of the numerical stress analysis of the power turbine of helicopter engine were presented. In order to solve the problem, the nonlinear finite element method was used.
L. Witek, F. Stachowicz
semanticscholar   +1 more source

Effects of parachute science on local research capacity 降落伞科学对当地研究能力的影响

Conservation Biology, EarlyView.
Abstract Strengthening research capacity is essential to address the global biodiversity crisis. Yet, parachute science often undermines this goal, and its prevalence, costs, and benefits are unclear. We analyzed 13,502 publications on primate research that we extracted from Scopus (1960–2022) to evaluate the effects of parachute science on local ...
Li Yang, Tao Chen, Colin A. Chapman, Paul A. Garber, Yu Xuan Fan, Tien Ming Lee, Michael Huffman, Juan Carlos Serio Silva, Carlos Peres, Onja H. Razafindratsima, Lwin Ngwe, Peng Fei Fan   +11 more
wiley   +1 more source

HELICOPTER PROPULSION SYSTEM

Journal of Industrial Design and Engineering Graphics, 2012
The objective of this paper is to understand how a helicopter jet engine works, which are their main characteristics and how they can be improved.
IONESCU Cristian Andrei
doaj  

Method for Helicopter Turboshaft Engines Controlling Energy Characteristics Through Regulating Free Turbine Rotor Speed and Fuel Consumption Based on Neural Networks

Energies
This research is devoted to the development of a method for helicopter turboshaft engine energy characteristics control by regulating the free turbine rotor speed and fuel consumption using neural network technologies.
Serhii Vladov, Maryna Bulakh, Jan Czyżewski, Oleksii Lytvynov, Victoria Vysotska, Victor Vasylenko   +5 more
doaj   +1 more source

Results of the flight noise measurement program using a standard and modified SH-3A helicopter [PDF]

A field noise measurement program has been conducted using both a standard SH-3A helicopter and an SH-3A helicopter modified to reduce external noise levels.
Henderson, H. R., Hilton, D. A., Pegg, R. J.   +2 more
core   +1 more source

NASA helicopter transmission system technology program [PDF]

, 1983
The purpose of the NASA Helicopter Transmission System Technology Program is to improve specific mechanical components and the technology for combining these into advanced drive systems to make helicopters more viable and cost competitive for commerical ...
Zaretsky, E. V.
core   +1 more source