Torque measurement system

Torque measurement system is intended for periodical control and endurance testing of various moving structural elements, e.g. turbine blades, etc.

Functions

of the torque measurement system

Statical tests
Dynamic tests
Complex tests
Test system verification
Sensors calibration

Operating principles

of torque measurement system

Depending on the particular task to be solved, there are two available configurations of torque measurement system:

  • based on digital sensors of ZETSENSOR series;
  • based on strain-gauge station ZET 017-T8.

Torque measurement system

based on digital sensors of ZETSENSOR series

The sensing element of the torque measurement system is represented by a strain-gauge bridge used for the control of shaft deformation. Depending on the particular task, the torque measurement is performed by means of measurement module ZET 7110 (statical measurements) or ZET 7111 (dynamic measurements). A detailed manual on the connection of strain gauges to ZETSENSOR modules is available in the Clause “Establishing strain-gauge bridges“.

In the case of static measurements, data transfer to PC is performed by interface converter ZET 7174.

In the case of dynamic measurements, the data received from measuring module ZET 7111 is saved to the offline recorder ZET 7173 (the recorder is mounted on the rotor shaft together with the batteries used for power supply of the recorder).

Interface converter ZET 7174 is used for configuration of the instruments included into the scope of the measuring system.

Digital accelerometers ZET 7152-N or ZET 7152-E (laboratory version, plastic casing) are used for the vibration level control on the rotor shaft.

It is also possible to transfer the data by radio channel. Telemetering system ZET 7172 is used for wireless data transfer from the measuring network to the PC via interface converters ZET 7174 or ZET 7176 for further data processing. Module ZET 7172-S included into the scope of the telemetering system, has an integrated linear acceleration sensor ZET 7152-N, which allows to determine rotation frequency value without implementing any additional measuring instruments.

Module ZET 7172-S is mounted on the rotating element in such a way so that Z axis of the integrated sensor ZET 7152-N would be transverse to the rotation axis, and Y axis would be aligned with the shaft curve.

7172-S - rotation frequency - Oscilloscope

7172-S - rotation frequency

ZETSENSOR: torque measurement

The system is scalable and perfectly suits for the measurement performance in the case if the measurement points are located far from each other.

For the purpose of measurements performance, there is used a program included into the scope of SCADA ZETVIEW.

SCADA system: torque measurements
SCADA system: torque measurement_2

Torque measurement system

based on strain-gauge system ZET 017-T8

The sensing element of the torque measurement system is represented by a torque sensor. For the purpose of particular specimen testing there is used a special platform with mounting fixture for the torque sensor and the tested specimen. In the course of measurements performance, the torque sensor should be firmly attached to the platform and the rotating specimen.

Torque measurement system platform

torque measurement system_3

Torque sensor: mounting technique

torque system: mounting

The torque sensor is connected to the strain-gauge station ZET 017-T8. ZETLAB TENZO Software delivered together with the strain-gauge station enables all types of measurements, including torsiography.

Integrated strain-gauge station generator provides the power supply for the sensor. It is possible to configure the corresponding parameters in the “Signal generator” program.

In order to measure the torque with a strain-gauge sensor and a strain-gauge sensor, there is used a program “Strain-gauge meter“. It is necessary to specify the required sensitivity level and the measurement limits in the program settings. The torque value is depicted in the corresponding indicator of the program.

Multichannel oscilloscope” program allows to create a graph of torque characteristics dynamics. It is possible to select a signal to be displayed from the signals, created by the program “Strain-gauge meter“.

The tests are performed in automated mode by means of task-specific software “Torque measurement system” implemented in SCADA ZETVIEW. An example of program operation is shown in the figure below. Upon tests completion, there is produced a report with measurements results, graphs, and characteristics of the tested specimen.

torque measurement program operation

Advantages

of torque measurement system

Automation

complex tests in automated mode

Scalability*

of the measurement system depending on the task to be solved

Approved system

the system incorporates certified components

Reliability

stable characteristics throughout operational life

Remote operation*

the measuring instruments and the WKS cab be located at considerable distance from each other

Test reports

are produced automatically in accordance with the selected template

* Torque measurement system based on the transducers of ZETSENSOR series

Test system verification methodics

For the purpose of test system verification and calibration of the torque sensors, there is used a special torque measurement instrument placed on the mounting fixture and having two branches. The measurements are performed by means of strain-gauge station ZET 017-T8 and task-specific software ZETLAB TENZO. The “Strain-gauge meter” program is used for torque measurement.

Calibration of torque sensors

set-up for the test system verification

torque sensors: calibration

set-up for the test system verification - side view

The weights with certain mass are sequentially attached to one of the two branches at a certain distance, which leads to the change of the torque value. For instance, when a 100 gr weight is attached to the branch at the distance of 100 mm, the torque value will be 0,1 Nm , for the weight 50 gr the value will be 0,05 Nm, for 200gr – 0,2 Nm.

Configuration options

of the torque measurement system

Measuring system based on the transducers of ZETSENSOR series (statical tests) from 1000 USD

  • Strain-gauge sensors
  • Strain-gauge sensor  ZET 7110
  • Interface converter ZET 7174 or ZET 7176
  • Kit for strain-gauges deposition
  • Signal recorder-reproducer

Measuring system based on the transducers of ZETSENSOR series (offline automated tests) from 2 556 USD

  • Strain-gauge sensors
  • Digital strain-gauge ZET 7111
  • Digital accelerometer ZET 7152-N or ZET 7152-E in plastic casing
  • Interface converter ZET 7174 or ZET 7176
  • Offline recorder ZET 7173
  • Battery with charging device
  • Kit for strain-gauges deposition
  • Signals recorder-reproducer
  • SCADA-project “Shaft torque measurement”
  • SCADA-system ZETVIEW

Measurement system based on transducers of ZETSENSOR series (dynamic measurements in real-time mode) from 3000 USD

Measuring system based on a strain-gauge station from 7 778 USD

  • Torque sensor
  • Telemetering station ZET 017-T8
  • Off-line recorder and flash-drive option
  • SCADA-project “Shaft torque measurement”
  • SCADA-system ZETVIEW

Torque measurement system can also be used as a torsiograph for detection of critical load. It is necessary to consider specimen parameters when choosing the measuring instrument:

  • at low rotation speed it is recommended to use measuring system based on the devices of ZETSENSOR series for dynamic measurements in real-time mode;
  • at high rotation speed, it is recommended to use measuring system based on devices of ZETSENSOR series for off-line dynamic measurements.

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