A submersible pump assembly for transference of a fluid medium with low viscosity is disclosed. In one embodiment, the submersible pump assembly includes multiple pump units co-axially aligned with a common drive shaft, a common suction chamber, and a common pressure chamber. Each of the pump units includes an active operational mode wherein the fluid medium is transferred from the common suction chamber to the common pressure chamber as well as an inactive operational mode wherein the fluid medium is circulated through the common suction chamber. Each of the pump units is individually actuatable.
F.32 International patent
COBISS.SI-ID: 46897667Fatigue strength of two different mechanical joint was experimentally determined. The mechanical joints were made from two different materials and two different joining technologies were used. A methodology for modelling and R&D evaluation of dynamically loaded mechanical joints was also developed. It enables simplified modelling of sheet-metal joints. The material properties of mechanical joints were determined by combining the static experimental results with a reverse-engineering approach, response surfaces and evolutionary algorithms. For an advanced high-strength steel CP800W a statistical comparison of step-stress and conventional fatigue-life experiments was carried out. For each type of the fatigue-life experiment the corresponding confidence intervals were estimated. A pilot research was performed to investigate a possibility of application of artificial intelligence for manufacturing process control on the basis of the current operating conditions. A concept for on-line data processing and data sampling from production line was set-up.
F.04 Increase of the technological level
COBISS.SI-ID: 16809243The aim of the project was to design and numerically evaluate the load-bearing profiles of solar panels for flat roofs. The newly developed system had to have as few components as possible with an option of an adjustable angle. Taking into account the requirements of the client, we proposed several concepts for both front and back support legs of solar panels. The main element of modularity was included with an easy assembly of two components to expand the back leg from a 10° to a 20° angle via the snap fit joint. The process of such an assembly was also simulated with a numerical model, where we could estimate and evaluate the required assembly force. The chosen concept was then also put through confirmation with the selected supplier. Next, structural numerical analysis of the chosen concepts were made. Here we controlled the plastification of load-bearing elements and additionally, their stability. Since self-tapping screws were chosen for the assembly into aluminum profiles, we experimentally measured the maximum permissible mounting torques for several types of screws. We also assembled dedicated grips for servo-hydraulic test machine, which enabled us to experimentally measure the pulling forces required to pull out the screws as well as shear forces at which slippage between the surfaces occurs. With this, we determined the load-bearing capability of the screw joints and evaluated them with respect to the required values.
F.06 Development of a new product
COBISS.SI-ID: 34962179Manufactured rotating tripod door with three bars is used for controlled access of persons to public areas such as stadiums, swimming pools, airports, etc. The construction of the load-bearing structure took place in several iterations. In this way, we improved the design through the design process and promptly eliminated mechanical deficiencies. The main change was made in the transition from V5 to V6 concept, where we unified the load-bearing profiles into L-profiles. We also changed the shape and height of the pillar, which is now smaller and slimmer. The material of the load-bearing structure is basically structural steel S355, the material of decorative and other sheets varies depending on the customer's requirements, it can be classic sheet metal or oxide sheet metal. A major change was also made in the final phase, where we adapted the basic form of construction to the Gotschlich drive, at the request of the client. For this purpose, we designed an additional support for the mechanism, we also changed the size of the opening for the bars, which changes (decreases).
F.08 Development and manufacture of a prototype
COBISS.SI-ID: 17032475During low-cycle fatigue tests, a specimen made of thin sheet metal may buckle under compressive loading. To prevent this event, a device is mounted on the test rig around the specimen, which prevents the specimen from buckling. This way, the tensile-compressive response of the material can be measured. The effect of the device onto the specimen is minimal.
F.33 Slovenian patent
COBISS.SI-ID: 16335899