Resonant test machines
Resonant test machines are ideal where a large number of cycles is required, with typical test frequencies in the range 80 – 300Hz.The main application is HCF (high cycle fatigue) in the following areas
Si-Plan can upgrade customers' test machines to the latest standards.
Si-Plan usually has second-hand refurbished machines available with new digital controller or second-hand analogue controller. These machines can be delivered, installed and calibrated to UKAS and ASTM standards.
Mechanical and electrical spare parts can also be supplied for most machines.
Si-Plan also offers new resonant testing machines of our own design and manufacture. Typical sizes are 20kN, 100kN, 200kN, 400kN and 600kN frames. The 400kN machine illustrated below is configured for testing rebar. The frame dimensions are 1259mm x 2500mm x 5000mm tall.
Grip and collet systems for rebar, bolt and materials tests are offered as accessories and specific fixtures enable torsion and bending tests. Furnace and environmental chambers further widen the testing scope of the resonant machine.Top
Si-Plan Electronics Research's digital Vibrophore controller and data
acquisition facility offers a computer interface control for resonant machines, both new frames and
The 32 bit servo controller, based on a 400MHz XScale™
Intel processor, has 16 bit analogue inputs for data acquisition.
replicates the options for setting parameters available on Si-Plan's solid state
control and measurement electronics.
The real-time rolling screen display (below) gives a graphical presentation of the test.
Load control, single DPM version QT1000
Si-Plan Electronics Research Ltd has been building and fitting control electronics to update Amsler Vibrophore frames® for over 25 years. The present systems offer solid state computer compatible control and measurement electronics with load signal conditioning and single DPM display.
Static load (tension or compression; automatic or manual control)
Number of fatigue cycles (from 100 to 100 million)
A free-standing 19" cabinet houses the main system elements:
The instrumentation rack consists of 8 modules:
Power Supply Module
The power supply is 55W ±14volt and 5 volt output for the instrumentation electronics.
Select the number of fatigue cycles to which the specimen is to be subjected. Any number of cycles from 100 to 100 million may be pre-set by means of the push buttons on the front of the counter and the decade switches below.
Crosshead Motor Control Module
Controls the static load applied to the test specimen by either manual or automatic control. In manual mode the operator depresses either the UP or DOWN button and observes the static load being applied to the test piece as indicated on the DPM module. In the automatic mode the operator sets the required load on the control marked SET LOAD, selects either TENSION or COMPRESSION using the selector switch next to the SET LOAD control and then depresses the AUTO ON button. The AUTO ON, UP and DOWN buttons are illuminated when that parameter is being used. In the case of auto operation the UP and DOWN lights will illuminate only when the motor is being used so that when the set point is achieved both will be extinguished. A remote manual control is also supplied, connected to the control electronics via a 4m cable.
A 4.5 (19999 fsr) digital panel meter (DPM) to indicate the load and test frequency applied to the test specimen. Select the parameter to be displayed on the DPM by depressing the appropriate buttons.
Used to set the level of dynamic load -peak to peak load - at which the operator requires the specimen to be tested.. The dynamic load is set independently of the static load
Auto Zero Module
Stores the machine settings at start up (immediately the RUN button is released) so that the trip module is automatically referenced to the required static and dynamic loads.
Compares the current dynamic and static load with the initial values stored by the autozero module. Stops the machine if the current values vary from the set value by more the the amount set with the TRIP ZONE control.
Load Cell Amplifier Module with multiple channel auto select
This module contains the strain gauge amplifier, bridge supply and associated range selection to scale the output voltage of a range of load cells to the correct level required by the control system. The load cells will be typically 20-200KN. This module also contains precision shunt calibration resistors. The control cabinet also houses:
Twin 400W Power Amplifier
This amplifier is connected to a matching transformer which is in turn connected to the AC excitation coil of the electromagnet in the load frame. The two 400W amplifiers are precisely matched and are working in parallel to provide 1400W peak power in the exciter coil when large or power absorbing specimens are being tested.
Crosshead Motor Amplifier
The high current drive amplifier for the crosshead motor, providing precise control of the static load applied to the specimen when the auto button is depressed.
This unit contains DC power supplies for the control coil of the electromagnet in the load frame and the power amplifier matching transformer.
Since the early 1970s Si-Plan has manufactured replacement controllers for Vibrophore Resonant Test Machines. The first systems replaced the original valve-based controllers supplied with the Vibrophores. They provided solid state analogue control, bringing better control of test loads and much improved reliability and ease of use. Many of the early Si-Plan Vibrophore controllers are still in daily operation.
The analogue controller was continually developed until 2004, when it was superseded by the digital controller, with computer user interface and data logger. The user screen is illustrated below. Where required, customer specific software and user interface can be offered.
Resonant machines come in a number of forms and common names are Si-Plan®, Amsler®, RUMUL®, Zwick® and Instron®.
Resonant test machines are ideal where a large number of cycles is required, with typical test frequencies in the range 80 – 300Hz.
Resonant machines are also very energy efficient with power requirements on a test of 10kN – 100kN at 120Hz, for example, in the order of 600 watts. Contrast this with a servo hydraulic machine which would test at around 30Hz and require in excess of 20 kilowatts.
The main application is HCF (high cycle fatigue) in the following areas
Updated 6 July 2012
Si-Plan Electronics Research Ltd, Avenue Farm Industrial Estate,
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