Novel Integrated Active and Passive Control of Fluid-Borne Noise in Hydraulic Systems

Abstract

Fluid-borne noise (FBN) is a major contributor to structure-borne noise (SBN) and air-borne noise (ABN) in hydraulic fluid power systems and could lead to increased fatigue in system components. FBN is caused by the unsteady flow generated by pumps and motors and propagates through the system resulting in SBN and ABN. New hydraulic technologies such as digital switched hydraulic converters also generate unavoidable FBN. This article reports on a novel integrated FBN attenuation approach, which employs a hybrid control system by integrating an active feed forward noise attenuator with passive tuned flexible hoses. The active system which consists of adaptive notch filters using a variable step-size filtered-X Least Mean Squares algorithm is used to control a newly designed high-force high-bandwidth piezoelectric actuator in order to attenuate the dominant narrowband pressure ripples. The passive hose is tuned in the frequency domain and used to cancel the high-frequency pressure ripples. A time-domain hose model considering coupling of longitudinal wall and fluid waves was used to model the flexible hose in the integrated control system. Very good FBN cancellation was achieved by using the integrated control approach in simulation and experiments. It is an effective, cost-efficient and practical solution for FBN attenuation. The problem of high noise levels generated by hydraulically powered machines has risen significantly in awareness within industry and amongst the general public, and this work constitutes an important contribution to the sustainable development of low noise hydraulic fluid power machines.

Parametric modeling of flow characteristics in reciprocating pump-pipe interaction system

“…Reciprocating pump is a key equipment of hydraulic power system and fluid delivery system. 1,3,12,18,28,36,37 The interaction effects between a reciprocating pump and a pipeline are noticeably important to the system performance. To validate the proposed model and analytical solutions, an experimental reciprocating pump-pipe system is established and the experimental tests under different working conditions are conducted in this section.…”

“…As a result, much research effort has been devoted to the attenuation of pressure pulsations. [3][4][5] However, the pressure pulsations could be utilized in some cases. Several previous studies purposely used pressure pulsations to transmit information 6 or diagnose sensor dynamics.…”

Hydraulic Pressure Ripple Energy Harvesting: Structures, Materials, and Applications

“…These passive FBN attenuation devices can be highly effective in reducing the FBN, with a typical reduction of 20 to 40 dB. [ 8 ] Active FBN control techniques with advanced control algorithms have also been developed for FBN attenuation in conventional and digital hydraulic systems, [ 17–22 ] but they are still in their infancy. The high energy of structure‐borne noise as a result of FBN can lead to failures in aircraft hydraulic systems due to the excitation of high‐density fluid fluctuations and the nature of the vibrational environment of the airframe.…”

Active Pressure Ripple Reduction of a Self-Supplied Variable Displacement Pump with Notch Least Mean Square Filter

“…As shown in Figure 3 , the swash plate angle of the variable displacement pump is decided by the control moments, which are generated by the pumping piston and control mechanism. The dynamics of the swash plate can be expressed as [ 20 ]: where J sw is the rotational inertia of the swash plate around X-axis, c sw is the damping coefficient of the swash plate, M p , M ap , and M cp are the moments generated by the nine pistons, an actuator piston, and a counter piston, respectively.…”

“…Zhai et al [ 18 ] utilized the active constrained layer damping treatment to achieve the vibration control. Pan et al [ 19 ] applied adaptive notch filters for pressure pulsation attention in a switched inertance hydraulic system, and a hybrid control system was also tried to reduce fluid-borne noise by integrating an active attenuator with passive flexible hoses [ 20 ]. Although the pressure pulsation reduces, additional control valves or actuators are necessary, which increases the complexity of the system.…”