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Interaction of particulate fluids and structures. Modelling and computational challenges
No full textAdditive Manufacturing: some dreams, some nightmares
Get PDFLaser-based Powder Bed Fusion of Metals (PBF-LB/M) is an additive manufacturing technology suitable for producing metal components with complex geometries and remarkable mechanical properties and performances. However, a widespread adoption of this technology in many industrial context is yet hindered due to the high stochasticity of the process. In fact, the complex process-structure-property relationships occurring in PBF-LB/M are today not yet fully understood. Therefore, suitable physical and numerical models need to be developed to shed light on these complex phenomena to boost a broader adoption of AM technologies in industrial applications. It is well known for example that the elastic behavior of lattice structures is dramatically underestimated when computed on the as-designed geometry. Furthermore, due to the inherent variability of PBF-LB/M process parameters, several sources of uncertainty hinder a full understanding of the complex process-structure-property relationships. In the presentation we will highlights some of the interesting applications open by the power of AM but also some limitations due the problems highlighted above
Jugular Vein Compression Collars for Mitigating Traumatic Brain Injuries in High-Impact Activities: A Narrative Review
No full textThe "Q-Collar" is a device designed to mitigate head injuries, particularly in scenarios such as contact sports and military operations where trauma to the head is a significant risk. It operates by exerting an external compressive force on the jugular veins, which effectively increases blood volume within the brain to counteract the "slosh" effect—that is, the movement of the brain within the skull during sudden impacts. The research documented in this literature review investigates the Q-Collar's efficacy by examining various clinical studies, as well as animal models, to understand its role and proven effects on reducing head trauma. This review includes 21 studies that were identified through a literature search using keywords related to "Jugular Vein Compression Collar" in the PUBMED database. The discussion highlights the physiological mechanism behind the Q-Collar's function: by compressing the jugular veins, it reduces the compliance of the cranial cavity, thereby stabilizing the brain and decreasing the risk of traumatic brain injury. The review finds evidence of the Q-Collar's effect in increasing intracranial and intraocular pressures, which suggests a mechanical countermeasure to the destabilizing effects of brain movement after an impact. Moreover, the findings include significant data from studies on high school athletes and special forces personnel, showing that Q-Collar users exhibited fewer microstructural brain alterations, better maintenance of cognitive functions, and fewer changes in white matter integrity than their non-collared counterparts. Preclinical small animal studies similarly present a reduction in inflammatory biomarkers associated with brain injury, indicating the collar's potential in protecting against histopathological changes. Research on the Q-Collar's use following blast exposure in military training shows additional benefits in memory function protection and auditory processing, as well as reduced auditory injury and tympanic membrane rupture, augmenting the case for the collar's protective effects. Finally, the review also touches on a potential application for patients with orthostatic hypotension, given the collar's influence on carotid baroreceptor-induced sympathetic activity. Hence, while the body of evidence under review supports the notion that the Q-Collar may be a valuable adjunct to helmets in the prevention of traumatic brain injuries, the review calls for further, longer-term studies to fully understand the extent of its benefits and potential limitations. The collective findings so far point towards a positive impact of the Q-Collar in scenarios of head trauma, with the device contributing to protective anatomical and functional changes within the brain. However, the nature of these studies—predominantly short-term and focusing on immediate or season-long effects—highlights the need for future research that extends beyond these temporal boundaries
Characterization of induction welded thermoplastic composites
No full textRib-AM project aims to contribute to the development of novel in-situ manufacturing technologies applied to large size components of primary structure of aircrafts. Framed in Clean Sky 2, the activities within Rib-AM are set out to develop a leading-edge (LE) concept based on reinforced thermoplastic materials avoiding mechanical joints between the skin and the ribs. Induction Welding (IW) process has been selected for the integration of the ribs into the leading-edge structure. The development of an appropriate IW process methodology, including the introduction of magnetic flux concentrators and new coil designs, are key to assure the quality and structural integrity of the produced joints.
In this research, the mechanical strength of induction welded thermoplastic composites have been evaluated at sample level. Characterization specimens have been obtained by welding: (i) short carbon fiber reinforced polyether ether ketone (SCFR/PEEK), with 10 % carbon content, processed by additive manufacturing – fused deposition modeling; and (ii) multidirectional carbon fiber reinforced polyether ether ketone (CFR/PEEK) laminates processed by oven consolidation. The mechanical characterization of the strength has been carried out by means of the block shear test method. In addition, light optical microscopy has been performed to analyse the SCFR/PEEK - CFR/PEEK interface. Infrared thermography (IRT) has been considered for the non-destructive characterization of the welded joints to evaluate the feasibility of being applied as an inspection method for induction welded structures. IRT results have been validated by X-ray computed tomography
Detecting Deviating Cells (DDC): An Outlier Filtering Approach for Unsupervised Damage Detection in Wind Turbines
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Research on seismic performance of corrugated web rigid structures
No full textCorrugated web H-beam refers to a steel beam with a wavy shape along its length, which is extensively utilized in various parts of building structures such as beams, columns, and walls. It serves the purpose of connection and support, while the corrugated or folded design enhances the shear resistance and out-of-plane stiffness of the web to some extent. However, despite their advantages including high strength, stiffness, and lightweight construction, relevant regulations stipulate that these members can only be used in lower-intensity applications or higher-intensity scenarios if specific conditions are met. One crucial condition is that the ratio between the design value of axial force subjected to seismic action and the product of the member's flange section area and steel's tensile strength should not exceed 0.4. In this study, we aim to further investigate the seismic characteristics and applicable intensity of corrugated steel structures under earthquakes through large-scale finite element ABAQUS simulations. We will observe dynamic characteristics and failure modes of corrugated rigid frame structures using elastic-plastic time-history analysis methods as well as examine plastic deformation features of steel beam members under low cyclic loads via hysteretic analysis methods. The findings demonstrate that when properly designed with reasonable beam spans, corrugated web rigid frame structures can still be employed in high-intensity areas above 7 degrees even when subjected to an axial compression ratio up to 0.5
Ecoclean India - Industrial Parts Cleaning
No full textIndustrial components cleaning is provided by Ecoclean India. Innovative, economical component cleaning system that uses both water and solvent-based technology.
A global market and technology leader in industrial cleaning technology. Have successfully partnered customers for Industrial and automotive cleaning requirements for a decade in India and installed over 100 'Made in India' machines globally.
With an extensive sales and service network, Ecoclean’s expertise spans all aspects of industrial parts cleaning delivering a rapid after-sales service on a global scale whilst, at the same time, remaining close to its customers.
Read More: https://ecoclean-india.com/blogs/
Company develops and markets products, systems and service solutions for industrial cleaning technology and water-based surface treatment. Our technology and service are trusted by our customers from the automotive industry and their suppliers as well as customers from the broad industrial market – from manufacturers of parts and components for medical and optical technology to the aircraft industry.
Ecoclean India with Head Office, Factory and Technology Centre in Pune has its sales and service network spread all over India to cater the customers’ parts cleaning needs. A strong workforce, with a backbone of the German Centres of Competence, helps provide optimum cleaning solutions which include spray cleaning, aqueous-based cleaning, solvent-based cleaning, ultrasonic cleaning, single chamber multi-process and customized machines.
With the corporate spirit of Ecoclean, inspired by technology and driven by innovation, we add value to the customer’s business.
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Strategy in Modern Firms: A Leadership Approach
Get PDFIn this Document, the situation of a Company, fictitiously named “Hydrogen” and operating in the
hydroelectric production sector, is represented.
The following paragraphs describe the strategic peculiarities in terms of company needs and of an
employee, representing his development situation in the context of insertion and with reference to
the inter and intra company strategies undertaken.
Paragraph 5.1 represents the organizational and strategic situation of the identified company,
identifying the objectives and needs of the people involved in the formulation of the corporate
strategy, using an analytical model for evaluating the priorities of each function or unit of the company
itself.
Paragraph 5.2 ,then, analyzes the development plan of a sample employee taking as a reference for
the advancement of skills in terms of emotional intelligence in reaching the executive level.
In Paragraph 5.3, a review of the development plan is carried out based on the strategic needs of
the identified company, also taking into account the achievement of part of the objectives and the
introduction of other reference parameters.
Finally, in Paragraph 5.4, the methods for developing company resources are identified using intercompany
collaboration tools that promote horizontal and vertical development of the resources and
processes themselves, as well as adequate professional development of the resources involved