1,720,974 research outputs found
Dispositivo sensorizzato di fissaggio di presa per arrampicata sportiva dotato di sensore di forza triassiale
No full textThe present invention relates generally to the field of sports equipment, and more specifically to the field of climbing.
The present invention has the object to provide a device for fastening climbing holds for sport climbing provided with a triaxial load cell. Among other possible areas of application of the present invention, in addition to training and competitions of sport climbing, there are functional recovery and psychomotricity
3D Printed Low Noise Nozzle: Design and Experimental Tests
No full textThe present paper focuses on the design of a nozzle needed for generating
impulsive air shots with the aim of moving objects. These objects are caps,
moving from a rotating cylinder to the bottle’s neck, inserted on an automatic
machine for bottle secondary sealing. The aim is the reduction of the noise generated
by the air shots, with the creation of an innovative nozzle which keeps the
same main dimension of the currently used one, but changes the inner geometry.
The new shape is obtained by a wide investigation on some existing design, found
in literature, on patents and theoretical studies. The 3D model has been created
on the software Autocad Inventor and then a first prototype has been 3D printed.
Moreover the new nozzle and a commercial one have been tested, comparing their
sound pressure in different conditions. In the end, the new nozzle is proved to be
less noisy then the actual one, given the same flow rate
A new pneumatic pad controlled by means of an integrated proportional valve
Full text linkAerostatic air bearings have the advantages of supporting loads with no friction and wear and for this feature they are extensively adopted in metrology as they allow very precise motion. The possibility of integrating an active component increases the performance of the aerostatic pads, which can be designed in order to obtain an infinite stiffness or to improve stability. In [1, 2] the authors developed a prototype of active pad controlled by means of digital valves and Arduino board. A shortcoming of this prototype was a small amplitude oscillation of the pad supply pressure due to the opening and closing of the digital valve. In order to overcome this problem a new prototype was designed making use of a proportional valve. This paper shows the first experimental tests together with the numerical model
Preliminary design of eddy current brake to improve sustainable mobility
Full text linkIn recent years, the need to reduce CO2 emissions has developed a change in the transport sector. E-mobility is emerging as a zero-emissions way of travel, but not only the combustion engine produces emission. In fact, a significant part of the vehicle's total pollution is produced by tires and conventional brakes. The eddy current brake is a possible alternative to the well-known mechanical brake to obtain zero-emissions braking with low maintenance. This type of brake converts the vehicle's kinetic energy into thermal energy through the magnetic generation of the eddy currents, which generate Lorentz braking forces. This paper proposes a preliminary design of a zero-emission eddy current brake with a first geometry variation to increase the brake performance, that has been evaluated with an analytical approach and EMS by EMWorks, a 3D finite element method magnetic software able to calculate brake torque and electromagnetic effects
Design of a new pressure regulator with electronic control: Friction forces analysis
No full textThe paper investigates the friction forces developed between the sliding members of a proportional pressure regulator with a power stage consisting of a poppet-type pressure reducer driven by a piston, and a pilot stage with two MATRIX high frequency digital monostable 2-way valves controlled by the PWM technique. Carried out using a specially developed test bench, the investigation identified lubricants and seal geometries that minimize friction forces. Effects of different greases and seal geometries were evaluated and different solutions were compared
Innovative force sensor for indoor climbing holds – real-time measurements and data processing, design and validation
Full text linkIn this article, a system to measure the evolution of load in time and space during indoor climbing is described. The system is based on a set of dedicated multiaxial load cells, which measure the load on each hold of an indoor climbing wall. When the climber hangs on a hold, the load signal is read and sent to a digital acquisition and processing system. Sensor design allows for measurement of the force components applied to the climbing holds, regardless of the application point of the force on the hold. Local deformations were measured through strain gauges. Based on the electrical configuration of the strain gauges, the values of the applied forces can be computed, making the contributions to the deformation due to bending moments and torsion negligible. The sensor was designed, assuming a maximum applicable load of 200 kg without plastic deformation. The design process was based on both analytical and finite element method analyses. An experimental calibration and testing campaign was performed to validate the sensor design
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Similarities on the permissive role of tissue oxygenation on compression- and contraction-induced hyperaemia
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