Method to determine internal leakage of aircraft's hydraulic servo

Jouko Laitinen; Kari Koskinen

doi:10.1007/978-3-319-95711-1_34

Method to determine internal leakage of aircraft's hydraulic servo

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review

Abstract

This paper addresses a method to determine possible internal hydraulic leak of airplane control servo. Internal hydraulic leakage is difficult to perceive due the leak doesn’t have any visible evidence outside the control servo. Leaking happens past the hydraulic piston or through faulty control valves. Such leaking can have serious consequences due servo’s decreased capacity and force especially situations where all the aerodynamic force of control surface is needed to maintain the ability to control the airplane. This kind of hidden failure can advance unobserved because decreased capacity of the servo can be enough to keep the airplane in control during normal flight conditions. However, in heavy flight manoeuvres such as aerobatics, the decreased rate of control surface’s angular velocity can lead to in-flight loss of control.
One relevant problem is how to find out when inner leakage is so severe, that it endangers safety of the airplane. To solve this kind of problem, a detailed quantitative model has been built. This model utilizes recorded in-flight process data and aircraft’s aerodynamical characteristics to determine condition of the control servo.

Original language	English
Title of host publication	12th World Congress on Engineering Asset Management & 13th International Conference on Vibration Engineering and Technology of Machinery
Subtitle of host publication	(WCEAM 2017) 2-4, August 2017, Brisbane, Australia.
Editors	J. Mathew, C. W. Lim, L. Ma, D. Sands, M. E. Cholette, P. Borghesani
Publisher	Springer
Pages	343-349
Number of pages	7
ISBN (Electronic)	978-3-319-95711-1
DOIs	https://doi.org/10.1007/978-3-319-95711-1_34
Publication status	Published - 2018
Publication type	A4 Article in conference proceedings
Event	World Congress on Engineering Asset Management - Duration: 1 Jan 1900 → …

Publication series

Name	Lecture Notes in Mechanical Engineering
ISSN (Electronic)	2195-4356

Conference

Conference	World Congress on Engineering Asset Management
Period	1/01/00 → …

Keywords

airplane
hydraulic control servo
hydraulic cylinder
inner leakage

Publication forum classification

Publication forum level 1

Access to Document

10.1007/978-3-319-95711-1_34

Cite this

Laitinen, J., & Koskinen, K. (2018). Method to determine internal leakage of aircraft's hydraulic servo. In J. Mathew, C. W. Lim, L. Ma, D. Sands, M. E. Cholette, & P. Borghesani (Eds.), 12th World Congress on Engineering Asset Management & 13th International Conference on Vibration Engineering and Technology of Machinery: (WCEAM 2017) 2-4, August 2017, Brisbane, Australia. (pp. 343-349). (Lecture Notes in Mechanical Engineering). Springer. https://doi.org/10.1007/978-3-319-95711-1_34

Laitinen, Jouko ; Koskinen, Kari. / Method to determine internal leakage of aircraft's hydraulic servo. 12th World Congress on Engineering Asset Management & 13th International Conference on Vibration Engineering and Technology of Machinery: (WCEAM 2017) 2-4, August 2017, Brisbane, Australia.. editor / J. Mathew ; C. W. Lim ; L. Ma ; D. Sands ; M. E. Cholette ; P. Borghesani. Springer, 2018. pp. 343-349 (Lecture Notes in Mechanical Engineering).

@inproceedings{80e2fe80df8b426fa3536762767f56b4,

title = "Method to determine internal leakage of aircraft's hydraulic servo",

abstract = "This paper addresses a method to determine possible internal hydraulic leak of airplane control servo. Internal hydraulic leakage is difficult to perceive due the leak doesn{\textquoteright}t have any visible evidence outside the control servo. Leaking happens past the hydraulic piston or through faulty control valves. Such leaking can have serious consequences due servo{\textquoteright}s decreased capacity and force especially situations where all the aerodynamic force of control surface is needed to maintain the ability to control the airplane. This kind of hidden failure can advance unobserved because decreased capacity of the servo can be enough to keep the airplane in control during normal flight conditions. However, in heavy flight manoeuvres such as aerobatics, the decreased rate of control surface{\textquoteright}s angular velocity can lead to in-flight loss of control.One relevant problem is how to find out when inner leakage is so severe, that it endangers safety of the airplane. To solve this kind of problem, a detailed quantitative model has been built. This model utilizes recorded in-flight process data and aircraft{\textquoteright}s aerodynamical characteristics to determine condition of the control servo.",

keywords = "airplane, hydraulic control servo, hydraulic cylinder, inner leakage",

author = "Jouko Laitinen and Kari Koskinen",

year = "2018",

doi = "10.1007/978-3-319-95711-1_34",

language = "English",

series = "Lecture Notes in Mechanical Engineering",

publisher = "Springer",

pages = "343--349",

editor = "J. Mathew and Lim, {C. W.} and L. Ma and D. Sands and Cholette, {M. E.} and P. Borghesani",

booktitle = "12th World Congress on Engineering Asset Management & 13th International Conference on Vibration Engineering and Technology of Machinery",

note = "World Congress on Engineering Asset Management ; Conference date: 01-01-1900",

}

Laitinen, J & Koskinen, K 2018, Method to determine internal leakage of aircraft's hydraulic servo. in J Mathew, CW Lim, L Ma, D Sands, ME Cholette & P Borghesani (eds), 12th World Congress on Engineering Asset Management & 13th International Conference on Vibration Engineering and Technology of Machinery: (WCEAM 2017) 2-4, August 2017, Brisbane, Australia.. Lecture Notes in Mechanical Engineering, Springer, pp. 343-349, World Congress on Engineering Asset Management, 1/01/00. https://doi.org/10.1007/978-3-319-95711-1_34

Method to determine internal leakage of aircraft's hydraulic servo. / Laitinen, Jouko ; Koskinen, Kari.
12th World Congress on Engineering Asset Management & 13th International Conference on Vibration Engineering and Technology of Machinery: (WCEAM 2017) 2-4, August 2017, Brisbane, Australia.. ed. / J. Mathew; C. W. Lim; L. Ma; D. Sands; M. E. Cholette; P. Borghesani. Springer, 2018. p. 343-349 (Lecture Notes in Mechanical Engineering).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review

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T1 - Method to determine internal leakage of aircraft's hydraulic servo

AU - Laitinen, Jouko

AU - Koskinen, Kari

PY - 2018

Y1 - 2018

N2 - This paper addresses a method to determine possible internal hydraulic leak of airplane control servo. Internal hydraulic leakage is difficult to perceive due the leak doesn’t have any visible evidence outside the control servo. Leaking happens past the hydraulic piston or through faulty control valves. Such leaking can have serious consequences due servo’s decreased capacity and force especially situations where all the aerodynamic force of control surface is needed to maintain the ability to control the airplane. This kind of hidden failure can advance unobserved because decreased capacity of the servo can be enough to keep the airplane in control during normal flight conditions. However, in heavy flight manoeuvres such as aerobatics, the decreased rate of control surface’s angular velocity can lead to in-flight loss of control.One relevant problem is how to find out when inner leakage is so severe, that it endangers safety of the airplane. To solve this kind of problem, a detailed quantitative model has been built. This model utilizes recorded in-flight process data and aircraft’s aerodynamical characteristics to determine condition of the control servo.

AB - This paper addresses a method to determine possible internal hydraulic leak of airplane control servo. Internal hydraulic leakage is difficult to perceive due the leak doesn’t have any visible evidence outside the control servo. Leaking happens past the hydraulic piston or through faulty control valves. Such leaking can have serious consequences due servo’s decreased capacity and force especially situations where all the aerodynamic force of control surface is needed to maintain the ability to control the airplane. This kind of hidden failure can advance unobserved because decreased capacity of the servo can be enough to keep the airplane in control during normal flight conditions. However, in heavy flight manoeuvres such as aerobatics, the decreased rate of control surface’s angular velocity can lead to in-flight loss of control.One relevant problem is how to find out when inner leakage is so severe, that it endangers safety of the airplane. To solve this kind of problem, a detailed quantitative model has been built. This model utilizes recorded in-flight process data and aircraft’s aerodynamical characteristics to determine condition of the control servo.

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KW - hydraulic control servo

KW - hydraulic cylinder

KW - inner leakage

U2 - 10.1007/978-3-319-95711-1_34

DO - 10.1007/978-3-319-95711-1_34

M3 - Conference contribution

T3 - Lecture Notes in Mechanical Engineering

SP - 343

EP - 349

BT - 12th World Congress on Engineering Asset Management & 13th International Conference on Vibration Engineering and Technology of Machinery

A2 - Mathew, J.

A2 - Lim, C. W.

A2 - Ma, L.

A2 - Sands, D.

A2 - Cholette, M. E.

A2 - Borghesani, P.

PB - Springer

T2 - World Congress on Engineering Asset Management

Y2 - 1 January 1900

ER -

Laitinen J , Koskinen K. Method to determine internal leakage of aircraft's hydraulic servo. In Mathew J, Lim CW, Ma L, Sands D, Cholette ME, Borghesani P, editors, 12th World Congress on Engineering Asset Management & 13th International Conference on Vibration Engineering and Technology of Machinery: (WCEAM 2017) 2-4, August 2017, Brisbane, Australia.. Springer. 2018. p. 343-349. (Lecture Notes in Mechanical Engineering). doi: 10.1007/978-3-319-95711-1_34

Method to determine internal leakage of aircraft's hydraulic servo

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