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HOME > BLOG

Understanding Noise In Hydraulic Systems

Author:SAIVS Time:2024-01-29 Click:

I. Introduction

Noise in hydraulic systems is a common concern, with the pump being a significant contributor to both fluid-borne and structure-borne noise.

The continuous pumping cycle generates pressure pulsations and fluid-borne noise, while mechanical linkages to components, 

like the tank lid, create structure-borne vibrations transferred to the surrounding air, resulting in air-borne noise.

Hydraulic System1.webp

II. Sources of Hydraulic System Noise

The primary sources of noise in hydraulic systems include:

Powertrain: Comprising the electric motor or engine, pump, and associated components, the powertrain is a major noise generator.

Valves: Noise can arise from valve opening and closing movements or leaks.

Pumps: Internal components, such as pistons or gears, contribute to noise during operation.

Fluid Conductors: Turbulence and vibration in pipes and hoses can lead to noise.

III. Types of Hydraulic System Noise

Mechanical Noise: Caused by vibrating or impacting mechanical components like pumps, motors, and valves.

Air Noise: Trapped air in the hydraulic system produces noise during compression or release.

Fluid Noise: Noise results from the hydraulic fluid's flow, especially under high velocities or turbulent conditions.

Structural Noise: Reservoirs or frames can amplify noise if not properly isolated or damped.

IV. Understanding Noise Parameters

Flow Ripple: Measures pump-induced flow variations during one revolution.

Blocked Acoustic Pressure: Examines pressure ripple across the first 10 harmonic frequencies, aiding in air-borne noise analysis. 

Full-frequency spectrum recording is recommended for a comprehensive assessment.


piston pump pressure ripple


V. Methods for Reducing Hydraulic System Noise

Methods for reducing Mechanical Noise

a. Use Low-Noise Components: Opt for hydraulic system components designed for reduced noise.

b. Reduce Vibration: Employ vibration-damping mounts or add weight to mitigate system vibrations.

c. Change Operating Speed: Lowering the system's operating speed helps minimize mechanical noise.

Methods for reducing Air Noise

a. Remove Air from the System: Utilize filters or separators to eliminate trapped air.

b. Adjust Flow Rate: Decrease the flow rate to reduce air-induced noise.

c. Change Fluid: Choose a less compressible fluid to minimize air noise.

Methods for reducing Fluid Noise

a. Smooth the Flow: Use baffles or restrictors to achieve smoother fluid flow.

b. Reduce Pressure Drop: Minimize pressure drop across the system to decrease fluid noise.

c. Change Fluid: Opt for a lower viscosity fluid to reduce fluid-induced noise.

Methods for reducing Structure Noise

a. Isolate the System: Use vibration-damping mounts to isolate the hydraulic system.

b. Change Design: Modify the system design to reduce structural vibrations.

By implementing these noise reduction methods, hydraulic systems can operate more quietly and efficiently, 

promoting a quieter and smoother working environment.


Hydraulic System Components

Tag: noise in hydraulic systems hydraulic systems

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