High-Tech – that serves our customers' needs
Impeller stress
We use the Finite-Element-Method (FEM) to determine material stress. As load set we use centrifugal forces and if necessary and possible also fluid forces. We carry out these calculations both for internal purposes and also as a service for our customers.
Stress measurements with strain gauges
We carry out strain gauge measurements to determine stress on components - typically at our impellers and casings. Thus, we verify our FEM computations, which are calculated in advance, upon request.
Modal analysis
The vibration characteristics of impellers
are determined by the values of natural frequencies. The values mentioned are calculated before manufacturing and constantly checked during production.
Mathematical Modal Analysis via FEM
Computational modal analysis accompany the design process via FEM with special consideration concerning the change of the natural frequencies caused by rotation.
Typical vibration with 2 nodal lines.
Typical vibration with sign change at every blade.
Experimental Modal Analysis
To verify our FEM-calculations we carry out experimental modal analysis. With measuring amplitude and phase in a bode plot we receive the values of the natural frequencies. The exact allocation of frequency to mode is done by using a high number of measurements at different points and examining the phase.
Casing calculations
The casings of our blowers and compressors are designed as pressure vessels if necessary and approved by the TÜV.
Casing of a vapour condenser with stiffening.
Test pressure 5 bar.
Designed in accordance with AD2000-S2.
Casing of a high pressure blower.
Test pressure 134 bar.
Designed in accordance with AD2000-S2.
TÜV-approved FEM calculation.
Software development as a tool for sales department
The knowledge transfer to the sales depart- ment is frequently done via PC programs. Thus, they have direct and easy access to results which can be used without any delay.
- Performance Tests and Optimization
- Stress calculations
- Impeller stress calculations and measurements with strain gauges
- Modal analysis - Calculation and measurement of natural frequencies at impellers
- Casing calculations
- Design of base frames with consideration of vibration problems
- Computational Fluid Dynamics (CFD) -
- Optimization of impellers and casings
- Flowtechnical power measurements at customer's facilities
- Sound measurements
- Software development as a tool for
- sales departments
- Active member of the Forschungsgemeinschaft für Luft- und Trocknungstechnik (FLT) (Study group for air- and drying technique)
Impeller stress
We use the Finite-Element-Method (FEM) to determine material stress. As load set we use centrifugal forces and if necessary and possible also fluid forces. We carry out these calculations both for internal purposes and also as a service for our customers.
Stress measurements with strain gauges
We carry out strain gauge measurements to determine stress on components - typically at our impellers and casings. Thus, we verify our FEM computations, which are calculated in advance, upon request.
Modal analysis
The vibration characteristics of impellers
are determined by the values of natural frequencies. The values mentioned are calculated before manufacturing and constantly checked during production.
Mathematical Modal Analysis via FEM
Computational modal analysis accompany the design process via FEM with special consideration concerning the change of the natural frequencies caused by rotation.
Typical vibration with 2 nodal lines.
Typical vibration with sign change at every blade.
Experimental Modal Analysis
To verify our FEM-calculations we carry out experimental modal analysis. With measuring amplitude and phase in a bode plot we receive the values of the natural frequencies. The exact allocation of frequency to mode is done by using a high number of measurements at different points and examining the phase.
Casing calculations
The casings of our blowers and compressors are designed as pressure vessels if necessary and approved by the TÜV.
Casing of a vapour condenser with stiffening.
Test pressure 5 bar.
Designed in accordance with AD2000-S2.
Casing of a high pressure blower.
Test pressure 134 bar.
Designed in accordance with AD2000-S2.
TÜV-approved FEM calculation.
Software development as a tool for sales department
The knowledge transfer to the sales depart- ment is frequently done via PC programs. Thus, they have direct and easy access to results which can be used without any delay.
Stress calculation of an axial impeller
Load set
- Centrifugal forces at 3 600 rpm
- Rotational acceleration at start-up
- Fluid forces at 30 bar suction pressure
Material: Aluminium, completely milled
Stress calculation of a wet chlorine compressor
Load set
- Centrifugal forces at 16 025 rpm
Material: Titan, palladium stabilized, welded impeller
Stress calculation of a vapour
condenser
Load set
• Centrifugal forces at 20 000 rpm,
circumferential speed of 370 m/s
• Rotational acceleration at startup
Material: Stainless steel, welded impeller
Computational Fluid Dynamics
We use CFD to optimise our impeller and casing geometry.
Total enthalpy in a compressor impeller at overload.
Pressure in a radial compressor, calculated and displayed with conformal mapping of impeller blades.
Calculation of the maximum flow rate which is limited by the speed of sound of the fluid at the inlet. The figure below shows conformal mapping of radial impeller blades.
Performance tests
We have a closed loop test arrangement to carry out performance tests of our machines.
Test arrangement data:
• Impeller speed up to 25 000 rpm
• Suction pressure 50 mbar(abs) to 3 000 mbar
• Possible test gas is ambient air, CO2 und SF6
Power range up to 200 kW
Due to our very flexible test arrangement concerning gas type and speed our sales department has very detailed characteristic curves. For this reason, we are able to take different influences on the dimensionless characteristic curve into consideration when working on a project, such as tip speed mach number, gas type and nominal size.
It goes without saying that we carry out field tests at our customer's facilities.
Sound measurement
We carry out complex in-house measurements to determine and optimize the sound radiation of our machines. Based on the measures mentioned our planning engineers are able to provide sound forecasts for the projected machines.
Upon customer's request we carry out sound intensity measurements in the implemented plant. Due to the used measuring technique the sound of other machines is eliminated and our customer can continue working completely undisturbed by our measurements.
