De anodiseerautomaat (Beschrijving en bediening)

Aerospace Engineerin

De potentiostaat van het laboratorium voor vormgeving en fabricage

Aerospace Engineerin

Het gebruik en het ijken van gevoelige drukmeters

Aerospace Engineerin

Metingen van fluctuaties in het toerental van de schroefmotor van de lage-turbulentiewindtunnel

Aerospace Engineerin

Automatic crack length measurements by the electrical potential drop method with computer control

Aerospace Engineerin

Plan of approach SBW wind modelling

This report presents the joint KNMI and Deltares Plan of Approach for the wind modelling activities for the coming years, with the goal to determine time and spatially varying extreme wind fields. These are required as input for the 2017 safety assessment of the primary water defences. The objectives of the project have been defined as follows: 1 Assessment of how well high-resolution atmospheric models can represent storm wind fields, and how can high-resolution models be used to represent the space-time structure of extreme storms. 2 Production of a long-term (of the order of 30 years) storm dataset that can be used for deriving the extreme wind statistics needed for the determination of HBC. 3 Extreme value analysis of the surface wind / stress fields, including a proper time and space dependence. The study will be divided into three work packages, each corresponding with one of the three above mentioned project objectives. Given that for time and space varying extreme wind fields above the Dutch water systems to be used in the 2017 assessment they need to be determined and accepted before the end of 2015, that is also the final deadline of the project.SB

Meting van de scheurlengte in metaalplaat m.b.v. een electrische potentiaal methode

Aerospace Engineerin

Man-made Islands in the Mackenzie river: Numerical modelling of ice jam development and release

Man-made islands in the Mackenzie river (Canada) for oil exploitation may obstruct the free flow of ice during spring break up. These ice dams may cause considerable rise of the water level in the rivers, resulting in floods. A numerical model is presented to simulate ice dam formation an river floods.Hydraulic EngineeringCivil Engineering and Geoscience

Bollard loads on new port infrastructure, port of Rotterdam authority policy

Mooring of vessels is very important for safe and efficient cargo handling of ships in ports, just as safe infrastructure is important. Civil Engineers and Mariners used to have a different approach for the same problem: what should be the safe working load (SWL) of a bollard. Mariners use the Minimum Breaking Load (MBL) of their mooring lines to determine the desired Safe Working Load (SWL) of the bollard, civil engineers commonly use design tables from international standards or guidelines with a relation between displacement of the vessel and bollard loads. There is a big gap between these two approaches, especially concerning the mooring of large container vessels. Both disciplines meet each other in dynamic mooring analysis (DMA); a computer calculation that calculates the vessel motions and resulting maximum loads on the mooring point resulting from wind, wave (sea, swell), current and passing vessel forces acting on the moored vessel. As a DMA is a rather complex calculation, a DMA is not carried out for every project and usually not in a preliminary design stage. This position paper describes a design approach for bollard loads that is understandable and acceptable for all involved disciplines and that is used by the Port of Rotterdam Authority for new builds.Rivers, Ports, Waterways and Dredging Engineerin

Smart sensor tights: Movement tracking of the lower limbs in football

This article presents a novel smart sensor garment with integrated miniaturized inertial measurements units (IMUs) that can be used to monitor lower body kinematics during daily training activities, without the need of extensive technical assistance throughout the measurements. The smart sensor tights enclose five ultra-light sensor modules that measure linear accelerations, angular velocities, and the earth magnetic field in three directions. The modules are located at the pelvis, thighs, and shanks. The garment enables continuous measurement in the field at high sample rates (250 Hz) and the sensors have a large measurement range (32 g, 4,000°/s). They are read out by a central processing unit through an SPI bus, and connected to a centralized battery in the waistband. A fully functioning prototype was built to perform validation studies in a lab setting and in a field setting. In the lab validation study, the IMU data (converted to limb orientation data) were compared with the kinematic data of an optoelectronic measurement system and good validity (CMCs >0.8) was shown. In the field tests, participants experienced the tights as comfortable to wear and they did not feel restricted in their movements. These results show the potential of using the smart sensor tights on a regular base to derive lower limb kinematics in the field.Electronic InstrumentationBio-ElectronicsEmerging Material