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Home >> Products >> Dynamic Fatigue Testing Machines >> Electronic Type Fatigue Testing >> Excitation System and Dynamic Strain Vibration Test Platform

Excitation System and Dynamic Strain Vibration Test Platform

Model: UTESD-5; for Frequency scanning, damping coefficient, elastic modulus, viscous modulus, dynamic strain, and vibration response of materials

UTESD-5 Excitation System and Dynamic Strain/Vibration Test Platform is specialized system cooperated with dynamic testing machine for mechanical properties of materials and components. It works together with a dynamic fatigue testing machine and uses electromagnetic sinusoidal excitation along with multi-parameter synchronous acquisition technology to accurately measure key dynamic parameters like dynamic stiffness, damping coefficient, elastic modulus, viscous modulus, dynamic strain, and vibration response of materials or specimens. It's essential equipment for R&D, quality inspection, and working condition simulation of products like elastomers, rubber and plastics, composites, vibration-damping components, and seals.

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General introduction

Principle:

The whole system uses an electromagnetic exciter as the vibration source, relying on a dynamic fatigue testing machine to handle specimen clamping, static preload, and basic constraints. By applying sine sweep or fixed-frequency vibration excitation, it imposes controllable alternating displacements and forces on the specimen. Accelerometers, displacement, strain, and force sensors simultaneously collect vibration, deformation, and mechanical signals, which are processed and analyzed in real time by the data acquisition system. Finally, it calculates dynamic mechanical properties of the specimen under dynamic loads, such as dynamic stiffness, damping, elastic modulus, and viscous modulus.

Core Features of the System: It uses small-amplitude alternating vibration excitation that closely resembles real service vibration conditions of products. It distinguishes between static mechanical performance and dynamic service performance, focusing on characterizing the stiffness degradation, energy loss, and viscoelastic properties of materials/components under alternating vibrations.

Main features

Core components and functions
Dynamic Strain / Vibration Acquisition and Analysis Unit (Data Core)
Mechanical Support and Fixture Units

The system is divided into four main modules: the excitation unit, the sensor acquisition unit, the mechanical support unit, and the data analysis unit. It also works in cooperation with a dynamic fatigue testing machine, with each component having a clear role:

1), Electromagnetic Excitation System

This is the vibration source of the entire setup. It uses electromagnetic induction to generate standard sinusoidal alternating vibrations, providing stable alternating displacement and excitation force. It supports two working modes: fixed-frequency vibration and sine sweep vibration. It can precisely control vibration frequency, amplitude, and excitation force.

Suitable for: small-amplitude vibration excitation, mainly used for non-destructive testing of dynamic stiffness and damping without causing fatigue damage to the specimen.

Output characteristics: Frequency is continuously adjustable, and amplitude can be set in stages according to the material's nonlinear characteristics.

2), Power Amplifier

Used with the exciter. It amplifies the weak control signals from the acquisition device to provide high-power drive current for the exciter, ensuring stable output of excitation force and amplitude, and preventing signal distortion.

Multi-channel Data Acquisition Device

The system hub that synchronously receives signals from all sensors. It features high-speed synchronous sampling, signal filtering, and real-time computation. It can simultaneously collect multiple signals like force, displacement, acceleration, and strain. Built-in dynamic mechanical analysis algorithms allow it to directly output results such as dynamic stiffness, damping, and modulus, supporting data storage, curve plotting, and report export.

It is a specially designed LCD static strain tester for research study, each including 8, 16 or 24 measurement channels in three different configurations, each measuring channel can measure force, displacement or strain. When measuring, functions such as sampling control and data analysis can be realized through LCD screen or computer software. The system can be widely used in the static structural performance test of major universities, research institutes of various industries, engineering testing sites and product development processes.

Main specification:

1 Number of channels: 8, 16 or 24 measurement points (channels), unlimited channel expansion via Ethernet;

2 Input method: DIF_DC;

3 Strain range: ±60000με;

4 Resolution: 0.1με;

5 Strain indication error: ± (0.5% red±3με);

6 Zero drift: not more than 2με/4h; (Customizable) (input short circuit, half hour warm-up at half bridge, constant temperature, converted to input at maximum gain)

7 Bridge mode: full bridge, half bridge, three-lane 1/4 bridge and public compensation 1/4 bridge;

Accelerometer

Piezoelectric / ICP high-frequency vibration sensor, installed on the specimen or the excitation end, collects vibration acceleration signals to calculate vibration velocity and amplitude, analyze resonance characteristics and vibration transmission patterns, and assist in damping coefficient calculations.

Displacement Sensor

Commonly used laser displacement sensors or LVDT displacement sensors, contact or non-contact, accurately measure real-time dynamic deformation and peak-to-peak vibration of the specimen. They provide basic parameters for calculating strain, dynamic deformation, and dynamic stiffness. Measurement range matches test amplitude ±0.5~5 mm, with high accuracy and fast response.

Dynamic Strain Sensor / Strain Gauge

Attached to the surface of the specimen, it captures dynamic micro-strain under alternating vibration in real time, distinguishing between static strain and alternating dynamic strain. Used to analyze local deformation and elastic deformation patterns in materials, working together with modulus and elasticity coefficient calculations.

Force Sensor

Integrated into the loading end / reaction frame, it monitors the alternating dynamic force generated by the excitation in real time. The force data, combined with displacement and strain signals, serve as the core input for dynamic stiffness calculation (stiffness = force / deformation).

Reaction Frame

A highly rigid integrated frame that provides a stable reference for the shaker, sensors, and specimens, counteracts the reactive forces generated by vibration, prevents the frame’s own vibrations from affecting test results, and ensures vertical excitation and uniform load. The frame has high stiffness and low deformation characteristics, eliminating the impact of frame resonance on tests.

Specialized Fixtures

Customized according to the shape of the specimen (block, strip, ring, vibration pad, rubber sleeve, etc.), used with the dynamic fatigue testing machine to clamp and position specimens, ensuring coaxial alignment, preventing specimen sliding or uneven loading, and accommodating different sizes of elastomer samples.

Core test items, calculation logic, and test specifications

1 Definition of Main Test Parameters

Movement and rigidity

The specimen's resistance to deformation under alternating vibration loads is distinguished from static stiffness. Calculation formula: Dynamic stiffness (K_d=) Dynamic alternating force / Dynamic deformation amount.

It reflects the load-bearing and deformation resistance of the elastomer under vibration conditions, which is the core indicator of shock absorption and cushioning components.

Damping coefficient

Parameters characterizing energy loss during material vibration are calculated by vibration attenuation and phase hysteresis. The greater the damping, the better the vibration absorption, noise reduction, and shock absorption effects, and it is often used in the selection of shock-absorbing materials.

Elastic coefficient

The ratio coefficient of elastic deformation to applied force in the specimen under dynamic load reflects the material's elastic recovery ability and determines whether the material maintains linear elastic characteristics.

Viscous modulus

For key indicators of viscoelastic materials (rubber, polyurethane, foamed elastomers, etc.), characterize the viscosity energy dissipation characteristics of materials, reflecting internal friction and hysteresis loss under alternating vibration, directly related to temperature rise, aging, and shock absorption durability performance.

2, Standard test method: Sine swept frequency excitation test

Frequency range: Commonly selected is 5 Hz ~ 100 Hz, covering the typical vibration frequency range for residential and industrial equipment; It can be expanded to low frequency (<5Hz) or high frequency (>100Hz) according to industry demand.

Amplitude settings: Set according to the material's nonlinear characteristics, with a general range of ±0.5 mm ~ ±5 mm.

Small amplitude (±0.5~1 mm): Tests the linear dynamic properties of the material;

Large amplitude (±2~5 mm): Tests the nonlinear dynamic characteristics of materials and simulates large deformation vibration conditions.

Main Application Areas and Test Objects

This platform mainly focuses on various elastomers, viscoelastic materials, and shock-absorbing components. It is widely used in material R&D, component quality inspection, and vehicle/equipment vibration damping system verification. The subfields are as follows:

4.1. Rubber / Polymer Elastomer Industry

Various rubber pads, rubber seals, rubber dampers, hoses, and sealing strips. It tests dynamic stiffness, damping, and hysteresis loss to guide formulation improvement and optimize vibration damping and sealing performance.

4.2. Polyurethane / Foam Materials

Polyurethane cushions, foam shock-absorbing materials, sponge components. The focus is on testing viscous modulus and damping to evaluate cushioning, vibration absorption, and noise reduction capabilities.

4.3. Automotive Components (Core Application Area)

Vehicle suspension pads, chassis shock absorber bushings, seat dampers, body buffers, tire tread materials. Simulates vehicle vibrations at different frequencies to assess damping effectiveness, ride comfort, and dynamic durability of components.

4.4. Rail Transit and Construction Machinery

Rail shock pads, construction machinery damping supports, equipment buffer mounts. Tests wide-frequency dynamic performance under high-vibration mechanical conditions.

4.5. Home Appliances and Electronic Equipment

Shock-absorbing feet for appliances, anti-vibration mounts for precision instruments, electronic component buffers. Prevents operational vibrations from causing noise or accuracy loss.