Find the root cause of increased vibration and rotor overspeed.

Solution

As a subcontractor we delivered technical expertise of vibration analysis, compressor thermodynamics, working condition (polytrophic head vs. rotor speed).

The post Radial compressor technical expertise appeared first on SPR.

Facilitate analysation of a complex production system

Solution

Plant model in Simulink with 17 factors and 4 responses was created to study equilibrium states and slow changes. We used analytic approach to set up differential system of equations. We also used statistical methods to construct 2^nd order response surfaces of certain responses. Parameter estimation was in usage for final model fitting.

The post Plant model of a slurry tank appeared first on SPR.

Control theory development and yield optimization for empirical systems

Solution

Planning and performing experiments, DOE. Factor significance computing, filtering of regressors to achieve response surface. Plant model creation and validation by statistical analysis. By systematic design of experience and statistical data analyzation we managed to compute response surfaces for agricultural, paper industry, biochemical, and polymer chemical machines.

The post Design of experience appeared first on SPR.

Design of pretensioned elastomer static sealing for 500-1000 bar at elevated temperature.

Solution

We provided complete engineering and manufacturing service from conceptual work through material engineering to manufacturing. First we acomplished comprehensive FEM simulation amoungs lower pressure proven design and comceptions, latern we validated final geometry for nominal pressure and assembling loads.

The post High pressure sealings appeared first on SPR.

Check static and fatigue strength of safety relevant components and connections of a hoist.

Solution

Strength assessment of parts and heat affected zone of welded connections was performed according to FKM guideline. Seam size of welded connections size was determined in accordance with DIN, bearing lifetime and shear elements strength was checked according to industrial standards. We not just check the strength but also suggested modifications.

The post Belt hoist technical expertise appeared first on SPR.

Feasibility study about modernization of a fruit belt dryer

Solution

Our fluid and thermodynamics knowledge and CFD experience allowed us to use a complex approach even in conceptual phase of a sophisticated project. Our team as a subcontractor performed a survey focusing on geometry, product mass flow, temperature and velocity distribution, and heat flow of the machine and air distribution ducts. Thereafter we created a simple 2D CFD model that we used to test our ideas about how to ensure even air flow in each cross section of the machine. Finally, we presented the most effective and cheapest idea to our partner. This way we convinced our partner that the old machine with cheap mechanical modifications and advanced control instruments can be elevated to the 21st century technical level.

The post Fruit parching machine optimization appeared first on SPR.

Assess static and dynamic strength of components

Solution

We are experienced in determining strength of metal components. Assessment can be

• based on strain gauge measurement, FEM or analytical computation
• based on nominal, structural or effective notch stresses
• done for welded or non-welded components, moulds, cold formed or surface coated parts
• focused on static or dynamic strength

Assessed part can operate elevated or normal temperature. Load can cause proportional or synchronous stresses. If non-proportional stresses are considered FKM method provides approximation of component strength. Material of components can be steel, iron or Al-alloys.

From measured data we calculate load spectra to classify load cases.

The post Strength assessment appeared first on SPR.

Redesign critical, unreliable details of a complex machine in cooperation with the customer’s technologist engineer.

Solution

As a subcontractor we analyzed the errors revealed by the technologists, found theirs root case. We came up with solutions, compared the fatigue strength of developed parts to the failed ones and created manufacturing documentation. This complex engineering service resulted subcomponents what worked flawless and much cheaper spare parts.

The post Laser Welding Machine Improvement appeared first on SPR.

Replace a broken part with a new one that has infinite life.

Solution

As a subcontractor we assessed the fatigue strength of the existing part according to FKM guideline. Based on the results of FEM stress calculations we changed the material, heat treatment and geometry around hot zone. By the end of the optimization stress amplitude was below the fatigue limit of the new part.

The post Test bench failure appeared first on SPR.

Check the strength of a 12.4 m x 1400 mm sized trough of a vibratory conveyor. Qualitative strength assessment of similar trough from the same product family. Create a well documented dimensioning calculation that allows designer to optimise critical parameters such as suspension units, flexural leaf springs, drive motor size and location, center of gravity and weight of counter mass.

Solution

3D surface model for FEM calculation. Modal analysis to avoid resonance ad to provide design suggestions for customer at conceptual phase of the development. The same model was used to check dynamic and static strength of the structure. At the end of the project final geometry was assessed again.

MathCAD document was created to dimension and optimised the vibratory conveyor. 4 DOF plain kinematic model was used to establish Lagrange equations. Optimisation algorithms were set up to determine local minimums for parasitic motions of the system. Calculation provided information for steady state and transients also.

The post Fluidised bed dryer technical calculations appeared first on SPR.