THEORETICAL INVESTIGATION OF A PULSE-WIDTH MODULATED ELECTRO-HYDRAULIC SERVO SYSTEM

Yıl 2000, Cilt: 15 Sayı: 1, 49 - 69, 01.03.2013

Ömer Keleş Yücel Ercan

Öz

In this study, the open loop and closed loop behaviours of a pulse-width modulated
electro-hydraulic system are investigated theoretically. First a mathematical model is
formulated for the system and methods for obtaining system responses to pulsewidth modulated inputs are developed. Using these methods, the responses of the
open loop and closed loop hydraulic systems to pulse-width modulated step,
periodic and aperiodic inputs are calculated. Effect of pulse frequency on the system
response is investigated. 

Anahtar Kelimeler

Pulse-width-modulation, electro-hydraulic system, electro-hydraulic servo valve, hydraulic position control

Puls Genişliği Modülasyonlu Elektrohidrolik Bir Servo Sisteminin Teorik İncelenmesi

Öz

Bu çalışmada, puls genişliği modülasyonlu elektrohidrolik bir servo sisteminin açık ve kapalı çevrim davranışları teorik olarak incelenmiştir. İlk olarak sistemin matematiksel modeli kurulmuştur. Daha sonra sistemin puls genişliği modülasyonlu
girişlere cevabını bulmak için metotlar geliştirilmiştir. Bu metotlar kullanılarak, puls genişliği modülasyonlu basamak, periyodik ve periyodik olmayan girişler için açık ve kapalı çevrim sistemlerin cevapları bulunmuştur. Puls frekansının sistem cevabı
üzerindeki etkisi incelenmiştir.

Anahtar Kelimeler

Puls genişliği modülasyonu, elektrohidrolik sistem, elektrohidrolik servovalf, hidrolik konum kontrolu

Kaynakça

• Suematu, Y., Yamada, H., Muto, T., “Digital control of hydraulic actuator
• system by the method of differential pulse-width modulation”, Nippon Kikai
• Gakkai Robunshu, C Hen/Transactions of the JSME Part C, Cilt 55, 2053-
• , 1989.
• Muto, T., Yamada, H., Suematsu, Y., “Digital control of hydraulic actuator
• system operated by differential pulse-width modulation”, JSME Int. Journal
• Series 3, Cilt 33, 641, 1990.
• Suematsu, Y., Yamada, H., Tsukamoto, T., “Digital control of electro-hydraulic
• servo system operated by differential pulse-width modulation”, JSME Int.
• Journal Series 3, 36, Cilt 61-68, 1993.
• Sakai, T., Tanaka, H., Sato, Y., “Switching-valve operated servomechanism for
• articulated construction-manipulator (inertia-load control by PWM energized
• fluid-pulse flow)”, Nippon Kikai Gakkai Robunshu, C Hen/Transactions of
• the JSME Part C, Cilt 61, 1078-1083, 1995.
• Muto, T., Kato, H., Sakamoto, K., “Digital control of hydrostatic transmission
• system driven by differential pulse-width modulation”, Nippon Kikai Gakkai
• Robunshu, C Hen/Transactions of the JSME Part C, Cilt 61, 3983-3990,
• -
• Jeronymo, C.E., Yamada, H., Muto, T., “Application of unified predictive control
• to on/off control of hydraulic system driven by fast-switching solenoid valves”,
• JSME International Journal Series C-Dynamics Control Robotics Design
• and Manufacturing, Cilt 39, 515-521, 1996.
• Keleş, Ö., Puls genişliği modülasyonu ile hidrolik konum kontrounun teorik ve
• deneysel incelenmesi, Doktora Tezi, Gazi Üniversitesi, Fen Bilimleri Enstitüsü,
• -
• Reeves, A.H., French Patent, No 852183, 1938.
• Reeves, A.H., British Patent, No 535860, 1939.
• Reeves, A.H., U.S.A. Patent, No 2272070, 1942.
• Jackson, K.R., U.S.A. Patent No 2655940, 1950.
• Murtaugh, S.A., “An introduction to the time modulated acceleration switching
• electro-hydraulic servomechanism”, Transaction of the ASME Journal of
• Basic Engineering, June, 263-271, 1959.
• Ikebe, Y., Nakada, T., “On a piezoelectric flapper type servo valve operated by a
• pulse-width-modulated signal”, Transaction of the ASME Journal of Dynamic
• Systems, Measurement and Control, March, 88-94, 1974.
• Mansfeld, G., “Fast switching ball valve as digital control elements for an
• electro-hydraulic servo actuator”, Sixth International Fluid Power
• Symposium, Cambridge, UK, 335-348, 1981.