DESIGN AND VIBRATIONS IN THE ROTARY HAMMER

10.6036/10297 ◽  
2021 ◽  
Vol DYNA-ACELERADO (0) ◽  
pp. [ 5 pp]-[ 5 pp]
Author(s):  
BEATRIZ IVORRA ZARAGOZA ◽  
SILVIA NUERE MENÉNDEZ-PIDAL ◽  
SARA GOMEZ MARTIN ◽  
JUAN DAVID CANO MORENO ◽  
MIGUEL BERZAL RUBIO
Keyword(s):  
Occupational Diseases ◽  
Construction Sector ◽  
New Materials ◽  
Pneumatic Hammer ◽  
Vibration Syndrome ◽  
A Value ◽  
Materials Used ◽  
Damping Of Vibrations ◽  
Better Than

The vibrations generated by manual machines can cause occupational diseases with both vascular and osteoarticular affectations, also known as hand-arm vibration syndrome. The pneumatic rotary hammer is one of these machines, widely used in the construction sector. In the bibliography consulted, it is found that the transmission of vibrations from the handle to the hand-arm system depends on both the composition of the material and the design of the handle. Although there are already improvements in this damping of vibrations received through the handles, there is a great field for its optimization, redesign and the search for new materials not yet used in the handles of pneumatic hammers. This article presents a methodology for the study of new materials used in the grip, including the analysis of the design, real tests for the characterization of the materials and their simulation by finite elements. The results obtained show that the design is a decisive factor for both vibration damping and weight. The redesigned grip that generates more damping at 33 seconds with a weight of 0.51kg is the "R1" with a value of 0.6346% better than the original grip, "Segeda original", with a weight of 0.55kg and with a damping value of 0.605%. Keywords: industrial design, pneumatic hammer, handle, elastomers, vibrations

scholarly journals Enhanced Material-Driven Design Methodology: Luffa Cylindrica’s Case

2021 ◽  
pp. 182-187
Author(s):  
Alejandro Plumed ◽  
David Ranz ◽  
Ramón Miralbes ◽  
Gustavo Vargas
Keyword(s):  
Design Methodology ◽  
Environmentally Friendly ◽  
New Materials ◽  
Luffa Cylindrica ◽  
New Concepts ◽  
Physical Prototype ◽  
Better Than

AbstractAs society and regulations demand more ecological materials, we must focus on finding new properties in potential candidates that make them really feasible and open up new possibilities. A new methodology is established to reach that goal, based on already existing ones, but with a broader vision; more focused on the use, and not solely on the product. To put it into practice, it’s been applied on Luffa Cylindrica, a plant with interesting properties. A volumetric, mechanical and perceptual characterization of it has been carried out, so that we can create new concepts specially linked to that. One of these paths has been fully developed to the point of getting a physical prototype, while more complex ones have been suggested. The stated methodology may be used as a flexible guide to find new materials not only more environmentally-friendly, but better than what’s stablished.

scholarly journals Insulating Building Components Made from a Mixture of Waste and Vegetal Materials: Thermal Characterization of Nine New Products

2021 ◽  
Vol 13 (24) ◽  
pp. 13820
Author(s):  
Maria La Gennusa ◽  
Concettina Marino ◽  
Antonino Nucara ◽  
Maria Francesca Panzera ◽  
Matilde Pietrafesa
Keyword(s):  
New Technologies ◽  
Thermal Characterization ◽  
Primary Energy ◽  
Construction Sector ◽  
New Materials ◽  
Agriculture Sector ◽  
Construction Techniques ◽  
Building Components ◽  
High Level

Nowadays, energy efficiency and sustainability are the fulcra of building policies. These policies promote the use of new technologies and materials that can reduce the primary energy involved and the environmental costs of construction, guarantying at the same time a high level of comfort for the building’s occupants. Synergy between previous construction techniques and the use of new materials should be pursued by employing materials with a low environmental impact and optimal thermal insulation properties. Within this framework, new materials derived from the agriculture sector, and waste or recycling products from the industrial/agricultural sectors have been studied. The aim of this paper is to contribute to this field by analysing the insulation properties of new environmentally friendly materials composited from waste or vegetal products for their applications within the construction sector. Measurements of the thermal conductivity of nine different samples are carried out, obtaining promising results suggesting that these products can be used as feasible alternatives to the materials traditionally used for construction and insulation. However, further analyses are certainly recommended, to assess the samples’ structural properties and the influence of pre-treatments on the samples.

scholarly journals CARACTERIZAÇÃO ESTRUTURAL DO COMPÓSITO PANI-MAGNETITA COM POTENCIAL APLICABILIDADE EM SENSOR ELETROQUÍMICO

Química Nova ◽  
2021 ◽  
Author(s):  
Caroline Zanotto ◽  
Patrícia Marques ◽  
Eryza Castro
Keyword(s):  
Synthetic Route ◽  
Waste Generation ◽  
New Materials ◽  
Electrochemical Tests ◽  
A Value ◽  
Potential Applicability ◽  
Oxide Particles ◽  
Stable Material

STRUCTURAL CHARACTERIZATION OF THE PANI-MAGNETITE COMPOSITE WITH POTENTIAL APPLICABILITY IN ELECTROCHEMICAL SESNOR. This study presents the production of a composite formed between polyaniline and magnetite (Pani-Mag) through an easy and more economical synthetic route, which satisfactorily contemplates the principles of green chemistry. The production of new materials for technological application also needs to be focused on less waste generation, and greater sustainability. FTIR and DRX analyzes confirm that the interactions between the polymeric phases and the oxide particles occurred in a synergistic way. Saturation magnetization has a value of 33.5 emu g-1, being compatible with reference values in the literature for Pani-Mag composites. The electrochemical tests indicate an electrochemically stable material with the potential to be applied as an electrochemical sensor in the determination of ascorbic acid in solution.

Characterization of Rh/Si multilayer structure by HREM and HAADF

1992 ◽  
Vol 50 (1) ◽  
pp. 122-123
Author(s):  
Y. Cheng ◽  
J. Liu ◽  
M.B. Stearns ◽  
D.G. Steams
Keyword(s):  
Normal Incidence ◽  
High Resolution Electron Microscopy ◽  
X Rays ◽  
Beam Direction ◽  
Cross Sectional ◽  
Optical Elements ◽  
Resolution Electron ◽  
Point To Point ◽  
Better Than

The Rh/Si multilayer (ML) thin films are promising optical elements for soft x-rays since they have a calculated normal incidence reflectivity of ∼60% at a x-ray wavelength of ∼13 nm. However, a reflectivity of only 28% has been attained to date for ML fabricated by dc magnetron sputtering. In order to determine the cause of this degraded reflectivity the microstructure of this ML was examined on cross-sectional specimens with two high-resolution electron microscopy (HREM and HAADF) techniques.Cross-sectional specimens were made from an as-prepared ML sample and from the same ML annealed at 298 °C for 1 and 100 hours. The specimens were imaged using a JEM-4000EX TEM operating at 400 kV with a point-to-point resolution of better than 0.17 nm. The specimens were viewed along Si [110] projection of the substrate, with the (001) Si surface plane parallel to the beam direction.

Emerging Techniques for the Characterization of Nano-Mechanical Properties of Integrated Circuit Components

2008 ◽  
Author(s):  
Nicholas Randall ◽  
Rahul Premachandran Nair
Keyword(s):  
Mechanical Properties ◽  
Quality Control ◽  
Integrated Circuits ◽  
Integrated Circuit ◽  
Manufacturing Process ◽  
Solder Bumps ◽  
Initial Work ◽  
Circuit Components ◽  
Materials Used

Abstract With the growing complexity of integrated circuits (IC) comes the issue of quality control during the manufacturing process. In order to avoid late realization of design flaws which could be very expensive, the characterization of the mechanical properties of the IC components needs to be carried out in a more efficient and standardized manner. The effects of changes in the manufacturing process and materials used on the functioning and reliability of the final device also need to be addressed. Initial work on accurately determining several key mechanical properties of bonding pads, solder bumps and coatings using a combination of different methods and equipment has been summarized.

SCALING ANALYSIS OF THE A-PHASE DYNAMICS DURING SLEEP

Fractals ◽  
2020 ◽  
Vol 28 (02) ◽  
pp. 2050050
Author(s):  
V. E. ARCE-GUEVARA ◽  
M. O. MENDEZ ◽  
J. S. MURGUÍA ◽  
A. ALBA ◽  
H. GONZÁLEZ-AGUILAR ◽  
...  
Keyword(s):  
Binary Sequence ◽  
Fluctuation Analysis ◽  
Scaling Analysis ◽  
Scaling Exponent ◽  
Sleep State ◽  
Phase Dynamics ◽  
A Value ◽  
Sleep Condition ◽  
Detrended Fluctuation

In this work, the scaling behavior of the sleep process is evaluated by using detrended fluctuation analysis based on wavelets. The analysis is carried out from arrivals of short and recurrent cortical events called A-phases, which in turn build up the Cyclic Alternating Pattern phenomenon, and are classified in three types: A1, A2 and A3. In this study, 61 sleep recordings corresponding to healthy, nocturnal frontal lobe epilepsy patients and sleep-state misperception subjects, were analyzed. From the A-phase annotations, the onsets were extracted and a binary sequence with one second resolution was generated. An item in the sequence has a value of one if an A-phase onset occurs in the corresponding window, and a value of zero otherwise. In addition, we consider other different temporal resolutions from 2[Formula: see text]s to 256[Formula: see text]s. Furthermore, the same analysis was carried out for sequences obtained from the different types of A-phases and their combinations. The results of the numerical analysis showed a relationship between the time resolutions and the scaling exponents; specifically, for higher time resolutions a white noise behavior is observed, whereas for lower time resolutions a behavior towards to [Formula: see text]-noise is exhibited. Statistical differences among groups were observed by applying various wavelet functions from the Daubechies family and choosing the appropriate sequence of A-phase onsets. This scaling analysis allows the characterization of the free-scale dynamic of the sleep process that is specific for each sleep condition. The scaling exponent could be useful as a diagnosis parameter in clinics when sleep macrostructure does not offer enough information.

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