New Dimensions in the Analysis of Stick-Slip, Friction and Wear
The jerky transition from static to dynamic friction known as stick-slip effect creates structure-borne noise in the material and is the cause of unpleasant squeaking and creaking noises. In addition, stick-slip leads to increased wear and material fatigue and is undesirable in most technical applications.
Conventional stick-slip test systems only allow a one-dimensional movement of the two materials or surfaces to each other. For the first time, our new 3D stick-slip test stand enables the simulation of real, highly dynamic relative movements and excitation states in three axes and provides important new insights into the origin and targeted avoidance of stick-slip.
The frictionless and noiseless movement of the three axes and the direct measurement on the two material samples enable high-precision and high-resolution measurements of the occurring friction forces. If required, the optional automatic mode controls a climatic chamber and carries out freely configurable, fully automated test sequences. New dimensions in the analysis of stick-slip and friction forces: Simultaneous excitation in three axes, precise, high-resolution and efficient!
- Highly dynamic simulation of real accelerations, forces and relative motions in 3 axes
- Simultaneous excitation in 3-axes or targeted excitation of individual axes
- Simulation of recorded time signal data and excitation with parameterizable standard signals such as sine, square, sawtooth, etc.
- Excitation with freely definable motion profiles (position-controlled)
- Max. Excitation force: 150N resp. 300N
- Max. Travel: 25mm pk-pk (standard), 50mm pk-pk available as onb option
- Max. Speed: 1m/s
- Frequency range: DC-500Hz, usable up to 1000Hz
- Acquisition of acceleration, force and displacement or position in all 3 axes
- Recording of temperature and humidity directly in the surrounding of the material samples
- Recording & analysis of airborne and structure-borne noise signals for analysis and evaluation of stick slip
- Measurement of friction forces and calculation of friction coefficients
- Measurement of spring forces and force-displacement diagrams
- Quiet electrodynamic actuators, no interference of the measurement data by crosstalk of vibrations and noises of the actuators to the measurement data
- Frictionless guidance of all moving elements without breakaway torques enables precise measurement of static and dynamic friction
- Direct inline force measurement enables high-resolution measurement of interface forces from 0.02N
- No influence on stick-slip and force measurement by position-dependent spring forces of external spring elements (e.g. by leaf springs for indirect force measurement)
- Integrated automatic mode allows fully automatic execution of predefined test cycles including control of a suitable climatic chamber
- Integrated temperature monitoring for all shakers
- Integrated displacement sensor and monitoring of the max. permissible vibration displacement for all vibration exciters
- suitable for use within a climatic chamber in the temperature range from -40°C to +85°C
- extremely robust design, low maintenance, reliable and durable
| x-axis | y-axis | z-axis | |
| Max. displacement | 25mm pk-pk, optional 50mm pk-pk | 25mm pk-pk, optional 50mm pk-pk | 25mm pk-pk, optional 50mm pk-pk |
| Locking of individual axes | Yes, software controlled | Yes, software controlled | Yes, software controlled |
| Adjustable overpressing / position | Yes, position controlled or locked | Yes, position controlled or locked | Yes, position controlled or locked |
| Max. velocity | 1m/s | 1m/s | 1m/s |
| Max. static preload force | 200N | 100N | 200N |
| Adjustable preload force | Yes, force controlled | Yes, force controlled | Yes, force controlled |
| Max. dynamic excitation force | |||
Sine | 300N peak | 150N peak | 300N peak |
Random | 200N rms | 100N rms | 200N rms |
| Frequency range | DC-500Hz, useable up to 1000Hz | DC-500Hz, useable up to 1000Hz | DC-500Hz, useable up to 1000Hz |
| Types of excitation | Sine, Random & Time History | Sine, Random & Time History | Sine, Random & Time History |
| Controlled variables | Position or acceleration, Force control available as an option | Position or acceleration, Force control available as an option | Position or acceleration, Force control available as an option |
| Typical operating noise | |||
Noise Rating Curve (NR) | NR18 | NR18 | NR18 |
Sound Pressure Level | <25dB(A) | <25dB(A) | <25dB(A) |
Time Varying Loudness | <0,2Sone | <0,2Sone | <0,2Sone |
| Overtravel protection | Yes | Yes | Yes |
| Overtemp protection | Yes | Yes | Yes |
| Measured quantities | Displacement/Position, Acceleration, Force, Temperature & Humidity | Displacement/Position, Acceleration, Force | Displacement/Position, Acceleration, Force |
| Acoustic analyses | Sound Pressure Level, Time Varying Loudness | ||
| Dimensions (W*H*D) | 955mm*630mm*763mm | ||
| Weight | 200kg | ||
| Use in climatic chamber | Yes, -40°C bis +85°C |
- Analysis and evaluation of the stick-slip risk of various material pairings and surfaces
- Measurement of friction forces and calculation of friction coefficients
- Aging, abrasion and wear testing
- Highly dynamic simulation of real accelerations, forces and relative motions in 3 axes
- Simultaneous excitation in 3-axes or targeted excitation of individual axes
- Simulation of recorded time signal data and excitation with parameterizable standard signals such as sine, square, sawtooth, etc.
- Excitation with freely definable motion profiles (position-controlled)
- Max. Excitation force: 150N resp. 300N
- Max. Travel: 25mm pk-pk (standard), 50mm pk-pk available as onb option
- Max. Speed: 1m/s
- Frequency range: DC-500Hz, usable up to 1000Hz
- Acquisition of acceleration, force and displacement or position in all 3 axes
- Recording of temperature and humidity directly in the surrounding of the material samples
- Recording & analysis of airborne and structure-borne noise signals for analysis and evaluation of stick slip
- Measurement of friction forces and calculation of friction coefficients
- Measurement of spring forces and force-displacement diagrams
- Quiet electrodynamic actuators, no interference of the measurement data by crosstalk of vibrations and noises of the actuators to the measurement data
- Frictionless guidance of all moving elements without breakaway torques enables precise measurement of static and dynamic friction
- Direct inline force measurement enables high-resolution measurement of interface forces from 0.02N
- No influence on stick-slip and force measurement by position-dependent spring forces of external spring elements (e.g. by leaf springs for indirect force measurement)
- Integrated automatic mode allows fully automatic execution of predefined test cycles including control of a suitable climatic chamber
- Integrated temperature monitoring for all shakers
- Integrated displacement sensor and monitoring of the max. permissible vibration displacement for all vibration exciters
- suitable for use within a climatic chamber in the temperature range from -40°C to +85°C
- extremely robust design, low maintenance, reliable and durable
- Analysis and evaluation of the stick-slip risk of various material pairings and surfaces
- Measurement of friction forces and calculation of friction coefficients
- Aging, abrasion and wear testing