An active control for hydrostatic journal bearing using optimization algorithms

Abstract

Purpose The purpose of this paper is to improve static/dynamic characteristics of active-controlled hydrostatic journal bearing by using fractional order control techniques and optimizing algorithms. Design/methodology/approach Active lubrication has ability to overcome the unpredictable harsh environmental conditions which often lead to failure of capillary controlled traditional hydrostatic journal bearing. The research develops a mathematical model for a servo feedback-controlled hydrostatic journal bearing and dynamics of model is analyzed with different control techniques. The fractional-order PID control system is tuned by using particle swarm optimization and Nelder mead optimization techniques with the help of using multi-objective performance criteria. Findings The results of the current research are compared with previously published theoretical and experimental results. The proposed servo-controlled active bearing system is studied under a number of different dynamic situations and constraints of variable spindle speed, external load, temperature changes (viscosity) and variable bearing clearance (oil film thickness). The simulation results show that the proposed system has better performance in terms of controllability, faster response, stability, high stiffness and strong resistance. Originality/value This paper develops an accurate mathematical model for servo-controlled hydrostatic bearing with fractional order controller. The results are in excellent agreement with previously published literature. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2020-0272

Analytical Research on the Bearing Characteristics of Oil Film Supplied with Constant Oil Flow Hydrostatic Turntables under Fixed Eccentric Load Condition

“…3 Lubricant outlet pressure is zero. 4 Laminar flow of lubricant exists inside the bearing. 5 Ignore the force and heat deformation of lubricant and solid base boundary.…”

“…The oil film overturning moment is 5.76 × 10 4 N • m at a tilt displacement rate of 0.4 and a rotation speed of 0 r/min. The overturning moment is 5.77 × 10 4 [Nm] , 5.81 × 10 4 [Nm] , 5.88 × 10 4 [Nm] , 5.97 × 10 4 [Nm] and 6.09 × 10 4 [Nm] at 200 r/min, 400 r/min, 600 r/min, 800 r/min and 1000 r/min, which increased by 0.1%, 0.9%, 2.1%, 3.6% and 5.7%, respectively.…”

Nonlinear Control of Hydrostatic Thrust Bearing Using Multivariable Optimization

“…Mizumoto [10] proposed an active orifice to control recess pressure. Rehman [11][12][13][14] proposed a controlled servo valve to adjust recess pressure. Eberhardt [15] measured the clearance gap with the help of an eddy current sensor; hydrostatic support is activated when the clearance gap is critical.…”