Shock Absorber Dual-Action Fatigue Testing Machine

Special dynamic fatigue test equipment for shock absorbers, adopting dual excitation structure to simulate real road vibration conditions for durability assessment

Product Overview

This shock absorber dual-action fatigue testing machine adopts independent upper and lower servo excitation units. It can apply vibration of different frequencies and amplitudes at both ends of the shock absorber simultaneously, simulating the actual working condition that the vehicle body vibrates at low frequency and large amplitude while the wheel vibrates at high frequency and small amplitude on the road. The machine is used for cyclic fatigue and durability testing of automotive, motorcycle and engineering shock absorbers. It supports superimposed waveform loading, lateral force auxiliary loading, cycle counting, real-time damping curve recording and performance change monitoring during long-cycle test. Multi-station clamping can be configured to test multiple samples at the same time. The supporting test software can set test cycles, stop conditions and alarm thresholds automatically, and record force, displacement, frequency and cycle data continuously. It is widely used for shock absorber product development, batch quality inspection and durability verification in auto parts factories and third-party testing institutions.

Applicable International Standards

The system is designed to comply with the following recognized testing standards:

ISO 13802 — Railway applications — Suspension components — Test methods for hydraulic dampers
SAE J2440 — Performance and Durability Testing of Automotive Shock Absorbers
ASTM E3077 — Standard Practice for Fatigue Testing of Components
ISO 7500-1 — Metallic materials — Calibration of static uniaxial testing machines

Note: Specific compliance depends on model configuration, force sensor selection and customized fixture design. Customized fixtures and test schemes for extra testing standards are available upon request.

Key Features

Dual independent excitation system — Upper and lower actuators work separately with adjustable frequency and amplitude, realizing superimposed vibration loading.
Optional force range — Multiple force range options from small force to large force, and can be configured according to customer test requirements, replaceable sensors for different shock absorber types.
Flexible waveform setting — Support sine wave, trapezoidal wave, random road spectrum waveform and combined dual-action excitation.
Optional lateral force loading module — Simulate lateral load during vehicle running to match real test conditions.
Multi-station optional structure — 2-station, 4-station or more stations for simultaneous testing to improve test efficiency.
Full-process data recording — Collect force and displacement in real time, draw damping hysteresis curve and track performance attenuation.
Intelligent cycle control — Auto stop after reaching preset cycles, with over-force, over-displacement and abnormal damping alarm.
Professional test software — Automatically save test records, export reports and support data review.
Complete safety protection — Overload, over-travel, emergency stop and abnormal vibration protection.

Technical Specifications

Parameter	Specification
Test Mode	Dual-action superimposed fatigue test, single excitation durability test, lateral force assisted loading test
Force Range	0.1 ~ 50 kN, multiple sensor options, customized according to test requirements
Force Accuracy	±0.5% of indicated value
Stroke Range	0 ~ ±100 mm (Customizable)
Frequency Range	0.1 ~ 20 Hz, upper and lower channels controlled independently
Displacement Resolution	0.001 mm
Specimen Type	Automotive shock absorber, motorcycle shock absorber, hydraulic damper, industrial vibration damper
Station Quantity	2 / 4 stations (Optional, customized)
Output Data	Force, displacement, frequency, test cycles, hysteresis curve, damping performance data
Power Supply	AC 380 V / 50 Hz (depends on configuration)

Specifications vary by model configuration, force sensor selection and customized fixture. Special stroke, frequency and multi-station layout can be customized for shock absorber testing requirements.

Typical Applications

Automotive shock absorber industry — Dual-action durability test of passenger car, commercial vehicle and SUV hydraulic shock absorbers.
Motorcycle & electric vehicle industry — Fatigue life verification of motorcycle and two-wheeler front and rear dampers.
Engineering machinery sector — Durability assessment of vibration dampers for construction machinery and agricultural vehicles.
Parts R&D laboratory — Evaluate damping attenuation and structural failure under long-term superimposed vibration.
Third-party testing institutions — Standard dual-action fatigue test and certification of shock absorber products.