Failures in the Development and Service of the Helicopter Transmission System

2011 ◽  
Vol 86 ◽  
pp. 74-81 ◽  
Author(s):  
Tong Bo Xue ◽  
Gai Qi Li
Keyword(s):  
Transmission System ◽  
Corrective Action ◽  
Mode Characteristic ◽  
Helicopter Transmission ◽  
Design And Manufacture

In this paper the failures which may occur in the development and service of the helicopter transmission system are discussed. The mode, characteristic, cause and corrective action for the failures are summarized. Besides, the measures of the design and manufacture to eliminate the failures are recommended.

Lubrication Mode and Selection of the Helicopter Transmission System Roller Bearing

2011 ◽  
Vol 86 ◽  
pp. 156-161
Author(s):  
Jun Peng Qiu ◽  
Mei Yin ◽  
Ling Song Guo
Keyword(s):  
Roller Bearing ◽  
Essential Element ◽  
Transmission System ◽  
Bearing Life ◽  
Lubrication Mode ◽  
Bearing Design ◽  
Helicopter Transmission ◽  
Design And Manufacture ◽  
Normal Work ◽  
Selection Of

The bearings will directly affect the performance of helicopter transmission system whether they are in normal work or not. Lubrication is the essential element for the normal work of bearings. Under the condition of the bearing design and manufacture technique, material technique is becoming more and more advanced, and lubricant becomes “the fifth main part”, which has been got a wide-ranged agreement. One of the most critical factors to improve bearing life is lubricant. This paper analyzes lubrication type and mode, and the failure of helicopter transmission system roller bearing caused by improper lubrication. It further explains the importance of lubrication to the bearings. And how to select lubrication mode and lubricant to improve the bearing life is also summed up.

Prediction and test of stable transmission time of spiral bevel gear during a loss-of-lubrication event in helicopter transmission system

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Yanzhong Wang ◽  
Kai Yang ◽  
Wen Tang
Keyword(s):  
Transmission System ◽  
Bevel Gear ◽  
Transmission Time ◽  
Tooth Surface ◽  
Spiral Bevel Gear ◽  
Content Type ◽  
Surface Burn ◽  
Spiral Bevel ◽  
Helicopter Transmission ◽  
Stable Transmission

Purpose This paper aims to establish a prediction model of stable transmission time of spiral bevel gear during a loss-of-lubrication event in helicopter transmission system. Design/methodology/approach To observe the temperature change of spiral bevel gear during working condition, a test rig of spiral bevel gear was developed according to the requirements of experiments and carried out verification experiments. Findings The prediction is verified by the test of detecting the temperature of oil pool. The main damage form of helicopter spiral bevel gears under starved lubrication is tooth surface burn. The stable running time under oil-free lubrication is mainly determined by the degree of tooth surface burn control. Originality/value The experimental data of the spiral bevel gear oil-free lubrication process are basically consistent with the simulation prediction results. The results lay a foundation for the working life design of spiral bevel gear in helicopter transmission system under starved lubrication.

scholarly journals A Life Estimation Method of Helicopter Transmission System Key-parts

2018 ◽  
Vol 382 ◽  
pp. 052016
Author(s):  
Qing Mei ◽  
Tiancai Guo ◽  
Tongbo Xue ◽  
Hua Wen ◽  
Zhenrong Huang
Keyword(s):  
Estimation Method ◽  
Transmission System ◽  
Life Estimation ◽  
Helicopter Transmission

Transmission System Health Management Technique

2011 ◽  
Vol 86 ◽  
pp. 487-491
Author(s):  
Xian Xin Cai ◽  
Xiao Jun Guo ◽  
Hai Yue Long
Keyword(s):  
Health Management ◽  
Transmission System ◽  
Management Technique ◽  
System Framework ◽  
Damage Prediction ◽  
Management Techniques ◽  
Improvement Scheme ◽  
Helicopter Transmission

Health management techniques used by a helicopter transmission system, THM, are presented in this paper, including outline of the system, framework of the system and the procedures of the damage prediction. The improvement scheme of the system is proposed and investigated. THM has been tested in a process of a helicopter flying test, which indicates that techniques used here are effective.

Preload Design of Bearings in Helicopter Transmission System

2011 ◽  
Vol 86 ◽  
pp. 170-175
Author(s):  
Mei Yin ◽  
Jun Peng Qiu ◽  
Jie Gao
Keyword(s):  
Service Life ◽  
Transmission System ◽  
Adjustment Procedure ◽  
Helicopter Transmission

In order to reduce running noise and enhance the stiffness and accuracy of shaft guidance, the bearings often use preload design in some position of the helicopter transmission system. In addition, the preload design of the bearings can compensate for wear in the operation and provide long service life of the bearings. By expatiating on the effect, types, determination and adjustment procedure, it offers reference for the design of preload for bearings.

Application of Contact Analysis in Strength Analysis of Helicopter Transmission System

2011 ◽  
Vol 86 ◽  
pp. 539-542
Author(s):  
Wei Li
Keyword(s):  
Finite Element ◽  
Control System ◽  
Boundary Conditions ◽  
Transmission System ◽  
Contact Analysis ◽  
Nonlinear Finite Element ◽  
Strength Analysis ◽  
Pitch Control ◽  
Actual Load ◽  
Helicopter Transmission

Taking the strength analysis of the tail rotor transmission system for one type helicopter as an example, the implicit nonlinear finite element contact analysis was taken to the control arms and flange of the tail rotor pitch control system using MSN/NASTRAN in this paper. It was pointed out that rightly modeling the actual load and boundary conditions of components is essential in the strength analysis of the transmission system.

scholarly journals Research on Rapid Assembly Technology of Helicopter Transmissions

2020 ◽  
Vol 306 ◽  
pp. 05004
Author(s):  
Wang Haiwei ◽  
Li Lulu ◽  
Yuan Sheng
Keyword(s):  
Data Structure ◽  
Hierarchical Model ◽  
Transmission System ◽  
Geometric Constraint ◽  
Assembly Model ◽  
Design Efficiency ◽  
Constraint Graph ◽  
Assembly Technology ◽  
Helicopter Transmission ◽  
Component Database

Research and application of rapid assembly technology can widely improve the design efficiency of helicopter transmissions. An assembly model of helicopter transmissions is presented by introducing Geometric Constraint Graph (GCG) method. A hierarchical model is obtained by multi-shrink decomposition. A corresponding data structure is generated according to the hierarchical model. CATIA based a parametric component database is built up. The Assembly modelling software is implemented by using VB. Finally, a helicopter transmissions example is taken as application and the rapid assembly for helicopter transmission system is achieved.

The Research on Design and Manufacture of AC Resistor

2013 ◽  
Vol 365-366 ◽  
pp. 745-749
Author(s):  
Wen Li Chen ◽  
Xing Zhe Hou ◽  
San Qiang Wang ◽  
Dan Liu ◽  
Kai Xia Sun
Keyword(s):  
Material Science ◽  
Design Principles ◽  
Transmission System ◽  
Basic Unit ◽  
Electronic Technology ◽  
Electric Parameter ◽  
Design Effect ◽  
Technical Features ◽  
Design And Manufacture

Ohm is the basic unit of electric parameter. Its quantity transferable system is achieved by the ohm resistor. The quality of the ohm resistor is directly related to the accuracy and reliability of quantity transmission system. Ohm resistor can be divided into DC resistor and AC resistor to use. With the development of modern electronic technology, the AC resistor attracts more attention. The design and manufacture of AC resistor has always been difficult which involves cross-integration of the mechanics, electromagnetic and material science, the design effect of most products is not ideal. The technical features, design principles and factors in manufacturing are present in this paper for AC resistor manufacture and test units.

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