Relevant bibliographies by topics / Shaft surface topography

Academic literature on the topic 'Shaft surface topography'

Author: Grafiati
Published: 10 December 2022
Last updated: 29 January 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Shaft surface topography.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Shaft surface topography"

1

Pusterhofer, Michael, Florian Summer, Michael Maier, and Florian Grün. "Assessment of Shaft Surface Structures on the Tribological Behavior of Journal Bearings by Physical and Virtual Simulation." Lubricants 8, no. 1 (January 15, 2020): 8. http://dx.doi.org/10.3390/lubricants8010008.

Full text
Abstract:
Optimizing the surface topography of cast iron crankshafts offers the opportunity to use this material as an alternative to steel in high-performance combustion engines. In the past, this was not possible due to the higher wear on bearing shells and the higher friction losses in relation to forged steel shafts. In order to find an optimized shaft micro topography, the friction and wear behavior of steel and cast iron shafts with different surface treatments were compared to each other, using a combined physical (experimental) and a virtual (computational) simulation approach. The experiments were carried out with a rotary tribometer using a journal bearing test configuration with the possibility to test real-life bearing shells and shaft specimens, manufactured from real-life crankshafts. In the experiments, a polished steel shaft with low bearing wear was effective. The optimization of cast iron crankshafts by a novel surface treatment showed a significant reduction of bearing wear in relation to the classical surface finishing procedures of cast iron shafts. A computational simulation approach, considering the real-life micro topography by using the Navier–Stokes equations for the calculation of micro hydrodynamics, supports the assessment of fluid friction. The virtual simulation shows, in accordance to the experimental results, only a minor influence of the investigated shaft topographies on the fluid friction. Further optimization of shaft surfaces for journal bearing systems seems possible only by the usage of patterned micro topographies.
APA, Harvard, Vancouver, ISO, and other styles
2

Kozuch, Emilia, Petros Nomikos, Ramin Rahmani, Nick Morris, and Homer Rahnejat. "Effect of Shaft Surface Roughness on the Performance of Radial Lip Seals." Lubricants 6, no. 4 (November 13, 2018): 99. http://dx.doi.org/10.3390/lubricants6040099.

Full text
Abstract:
Reduction of leakage from the shaft–radial lip seal conjunction is critical in ensuring enduring performance of entire lubrication system. This paper investigates leakage from three types of shaft surfaces, finished using different manufacturing processes. The measurement of surface topography is conducted in order to determine the pertinent roughness parameters which correspond to the observed sealing performance in real practical applications. It is found that the skewness of the surface topography correlates well with the anecdotal leakage failure rate. To quantify this association, a hydrodynamic model, accounting for shaft roughness in a deterministic manner is developed. The results from the numerical analyses confirm that the lubricant mass flow rate is reduced in the case of negatively skewed surface height distributions, when compared with the positively skewed profiles.
APA, Harvard, Vancouver, ISO, and other styles
3

R.S., Suja, Mini Alikunju, Aswathy Maria Oommen, Sreekumar R, Sheena Kalyani Sukumaran, Chandra Mohan Nair Kaleeluvilayil Ragbavannair, Lincy Varghese, and Swapna Thampi. "Morphology, Topography and Clinical Significance of Primary Nutrient Foramina in Tibia." Journal of Evolution of Medical and Dental Sciences 10, no. 14 (April 5, 2021): 999–1002. http://dx.doi.org/10.14260/jemds/2021/214.

Full text
Abstract:
BACKGROUND Nutrient foramina are seen in the shaft of long bones. They vary in number, size and their position on the surface of bones. It transmits the nutrient artery which is the main source of blood supply to the long bones. We intend to study the location, number, type and direction of primary nutrient foramina (PNF) on the shaft of tibia. METHODS The descriptive study was done using 120 tibiae (right-66, left-54) from Department of Anatomy, Govt. Medical College, Thiruvananthapuram. Length of each bone and distance of the nutrient foramen from the upper end of tibia was measured using osteometric board. The location of the primary nutrient foramina on the surface of tibia, the direction of the nutrient canal and the presence of secondary nutrient foramina were noted. RESULTS Single primary nutrient foramina were located on the posterior surface of 113 tibiae. 4 tibiae showed PNF and secondary nutrient foramina (SNF). No nutrient foramina were observed in 3 tibiae. CONCLUSIONS The precise knowledge and topography of PNF of tibia will help orthopaedic surgeons in minimising damage to vasculature of tibia during various surgical procedures. KEY WORDS Tibia, Nutrient Foramen, Nutrient Artery
APA, Harvard, Vancouver, ISO, and other styles
4

Jin, Cheng Zhe, and Rui Fang. "Research on Surface Topography and Roughness of Micro Parts by High Speed Turn-Milling." Materials Science Forum 800-801 (July 2014): 607–12. http://dx.doi.org/10.4028/www.scientific.net/msf.800-801.607.

Full text
Abstract:
High speed turn-milling has superiority on the productivity and the quality of work pieces, and is more suitable to machine micro-shaft parts and desirable miniature parts based on the turn-milling technology. In this papers adopting orthogonal experiment method cutting experiments of orthogonal turn-milling Aluminum alloy have been done. The relation between turn-milling regimes (cutter rotate speed, axial feed, feed per tooth etc.) and machined surface roughness has been ascertained. Finally, primary and secondary order of cutting regimes impacting surface roughness has more been confirmed through orthogonal experiments variance analysis, the rotate speed of cutter (cutting speed) influence greatly on surface roughness. Through 2-dimension surface topography diagram and 3-dimension surface topography of processed surface, it can be seen that high speed turn-milling processing technology can process micro miniature component of high surface quality, and features excellent development prospect and application value.
APA, Harvard, Vancouver, ISO, and other styles
5

Jin, Cheng Zhe, and Rui Fang. "Research on Surface Topography and Tool Wear in Micro-Turn-Milling of Micro-Screw." Advanced Materials Research 500 (April 2012): 377–82. http://dx.doi.org/10.4028/www.scientific.net/amr.500.377.

Full text
Abstract:
Turn-milling technology can replace turning with milling to high speed machining rotationally body parts. So, micro-turn-milling has superiority on the productivity and the quality of workpieces, and is more suitable to machine micro-shaft parts and desirable miniature parts based on the turn-milling technology. Micro-turn-milling can be used for the machining of micro-parts in its hardened state. In this paper, the influence of cutting parameters on surface topography and tool wear is presented in micro-turn-milling of micro-screw. The interaction effect of parameters to surface topography and tool wear is investigated. The results show that micro-turn-milling technology has its peculiar advantages in realizing high-speed cutting and ensuring machining quality.
APA, Harvard, Vancouver, ISO, and other styles
6

Engelfried, Maximilian, Matthias Baumann, and Frank Bauer. "Three-dimensional structure-based approach for the analysis of macroscopic lead structures on sealing counterfaces." International Journal of Metrology and Quality Engineering 13 (2022): 2. http://dx.doi.org/10.1051/ijmqe/2022003.

Full text
Abstract:
The seal failure of an elastomer rotary shaft seal is often caused due to lead on the shaft counterface. In sealing technology, the term ‘lead’ includes all structures on sealing counterfaces that are capable of transporting fluid in axial direction through the sealing contact and thus disrupting the sealing mechanism. Lead structures are created during the manufacturing process of the shaft surface or throughout the handling. They occur in various shapes and sizes. Depending on the characteristics of the lead structures, several specialized measurement and evaluation methods exist which have to be applied in combination. However, not all types of lead can be covered with the methods known so far. State of the art are frequency-based and model-based analysis methods, which are only able to detect periodic lead structures. Aperiodic and stochastically distributed lead structures cannot be detected due to the functional principle. This article provides an approach for a structure-based evaluation of macroscopic lead structures based on optical topography measurement data. This allows to detect all known types of macroscopic lead on the shaft surface and in future to measure microscopic and macroscopic lead with a single measurement procedure.
APA, Harvard, Vancouver, ISO, and other styles
7

Labuda, Wojciech. "The Influence of Cutting Parameters on Surface Topography During Turning Marine Pump Shafts." Journal of KONES 26, no. 4 (December 1, 2019): 141–48. http://dx.doi.org/10.2478/kones-2019-0101.

Full text
Abstract:
AbstractOne of the greatest problems of modern production techniques is the achievement of an appropriate quality at minimal costs and accompanied by the production efficiency increase. Therefore, while designing the production process. The technology used should have a considerable influence on the durability and reliability of machine parts to be produced. During finish treatment, the final dimensions as well as functional properties are imparted to a given element by application of proper treatment type. The engineer has a range of production techniques to choose for the proper surface layer formation. Conventional turning machines belong to the basic equipment of ships, because in sea conditions, they enable the execution of a spare part or carrying out the necessary operations in the process of their regeneration. The use of modern cutting tools makes it possible to obtain a surface with low values of surface roughness parameters. The use of new generation cutting inserts on conventional lathes can cause problems for operators. The lack of the ability to ensure proper of treatment condition and setting errors of cutting tools contribute to the damage of the cutting insert or the surface of the workpiece. The article presents the results of influence of different cutting parameters on surface topography during turning process of stainless steel. A shaft made of 304L stainless steel was used for the research. The cutting process was carried out on a universal TUM 25B x 500 centre lathes. During the turning the following machining parameters were used: cutting speed Vc [m/min], feed f [mm/rev] and depth of cut ap [mm].The turning process was conducted by a cutting tool with CCGT 09T302 UM, CCGT 09T304 UM and CCGT 09T308 UM inserts. Measurement of surface topography was carried out by T8000 profilometer.
APA, Harvard, Vancouver, ISO, and other styles
8

Wu, Quanhui, Yazhou Sun, Wanqun Chen, Qing Wang, and Guoda Chen. "Theoretical prediction and experimental verification of the unbalanced magnetic force in air bearing motor spindles." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 233, no. 12 (March 26, 2019): 2330–44. http://dx.doi.org/10.1177/0954405419838656.

Full text
Abstract:
Dynamic vibrations of air bearing motor spindles have significant influence on the surface quality in ultra-precision machining. In this article, the influence of the vibration caused by the unbalanced magnetic force on the diamond turning is investigated on the basis of the theoretical and experimental method. A permanent magnet motor model (10 poles and 12 slots) is built and then simulated to gain a periodic unbalanced magnetic force. The effects of unbalanced magnetic force on the inclination of the spindle shaft is analyzed, which would affect the surface quality of the workpiece, and the surface topography of the workpiece is predicted during an unbalanced magnetic force acting on air bearing motor spindle. The theoretical analysis and experimental turning results validate that the angle between the direction of unbalanced magnetic force and the feed direction has a certain relationship with the profile of the machined surface. Also, under different turning speeds and directions, the surface topography of the machined workpiece shows a 10-cycle-per-revolution pattern, which has good agreement with the simulations of periodic unbalanced magnetic force. This research work provides a theoretical foundation for the fault diagnosis of air bearing motor spindle caused by motor rotor eccentricity and its effect on surface generation in turning.
APA, Harvard, Vancouver, ISO, and other styles
9

Nguyen Phi, Hung, and Thang Pham Duc. "Using Topographic Advantages in Formulating a Strategy to Access Ore Bodies at Ban Phuc Nikel Mine." E3S Web of Conferences 174 (2020): 01013. http://dx.doi.org/10.1051/e3sconf/202017401013.

Full text
Abstract:
There are various types of underground mining that are categorized based on the kind of shafts used, the technique of extraction and the process used to get to a deposit. Development mining is composed of excavation almost entirely in (non-valuable) waste rock in order to gain access to the orebody. To start the mining, the first step is to make the path to go down. Development, the work of opening a mineral deposit for exploitation is performed. With it begins the actual mining of the deposit. Access to the deposit must be gained either by stripping the overburden, which is the soil and/or rock covering the deposit,to expose the near- surface ore for mining or by excavating openings from the surface to access more deeply buried deposits to prepare for underground mining. The type of underground mining technique used is typically based on the geology of the area, especially the amount of ground support needed to make mining safe. When using to exploit ore body by underground mining method, the textbook guide in universities of Vietnam had had 4 main strategies include: access by horizontal tunnel lines, access by incline shaft, vertical shaft and combination of above access method. In this study, we developed a solution outside of four above approaches, to take advantage of the topography, transport potential energy, and advantages when constructing sloped incline, backward from outside to inside.
APA, Harvard, Vancouver, ISO, and other styles
10

Muszyński, Zbigniew, and Marek Wyjadłowski. "Assessment of the Shear Strength of Pile-to-Soil Interfaces Based on Pile Surface Topography Using Laser Scanning." Sensors 19, no. 5 (February 27, 2019): 1012. http://dx.doi.org/10.3390/s19051012.

Full text
Abstract:
This article presents in situ research on the side surface of continuous flight auger (CFA) foundation piles using a three-dimensional (3D) laser scanner (Leica ScanStation C10) in order to evaluate the morphology assessment of pile concrete surfaces in various geotechnical layers. Terrestrial laser scanning describes the 3D geometry of the construction with high spatial resolution and accuracy. A total of six areas were selected from the acquired point cloud for which a two-step approach for removing the form was applied. In the first step, the reference surface was fitted using the least squares method, and then, cylindrical projection of the surface was performed. In the second step, an operator of removal of the multi-plane form was applied. For each sample, height parameters (Sq, Ssk, Sku, Sp, Sv, Sz, Sa) and functional volume parameters (Vmp, Vmc, Vvc, Vvv) according to the standard ISO 25178-2:2012 were determined. Significant differences in the values of surface height and functional volume parameters were observed for each geotechnical layer where piles were formed. Because the piles remain embedded in the ground, in situ tests of the side surface of piles are rarely performed and taken into account in the assessment of pile bearing capacity. The study of surface topography is a crucial stage in the assessment of the shear strength at the interface between a concrete pile and the soil layer. The obtained concrete morphology assessments are applicable during the determination of the skin friction factor in the analytical or numerical estimation of pile shaft resistance. The proposed procedure of morphology evaluation may improve the fidelity of the assumed friction factor between the concrete and soil and increase the reliability of direct shear experiments.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Shaft surface topography"

1

Soga, Diogo. "Medida de topografia de superfície usando a técnica de deslocamento de fase." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-02082013-153443/.

Full text
Abstract:
Neste trabalho, medimos o perfil 3D de superfícies (microtopografia) utilizando uma técnica de interferometria óptica: Phase-Shi,ftzng (Deslocamento de Fase). Utilizamos um interferômetro do tipo Twyman-Green para produzir fi.guras de interferência da superfície analisada. Essas imagens foram armazenadas usando-se uma câmera CCD ligada à um microcomputador. Para obter a microtopografia, calculamos o Mapa de Fase a partir das imagens digitalizadas usando um programa de microcomputador. Posteriormente um outro programa removeu a ambiguidade da função tangente (unwrapping), pela Técnica do Autômato Celular, usada no cáiculo do Mapa de Fase. Então efetuamos os cálculos para determinar a microtopografia da superfície. Depois fizemos a análise da microtopografia, levantando informações relevantes para a sua caracterização. Analisamos objetos com alta refletividade (espelhos planos e redes de Ronchi) e obtivemos bons resultados. Também comparamos alguns dos resultados obtidos com a técnica de Deslocamento de Fase com os resultados obtidos pela análise de Franjas de Igual Espessura.
In this work we measured the 3D profile of surfaces (microtopography) using a optical interferometric technique: Phase-Shifting. We used a interferometer of type Twyman-Green to produce interferograms from analyzed surface. These images was captured using a CCD camera that was linked to a microcomputer. To obtain a microtopography, we calculated the Phase Map using the digitalized images and a software of microcomputer. Then another program removed the wrapping of tangent fuction, using the Cellular-Automata Technique, that was used to calculate the Phase Map. So we calculated the microtopography of the surface. After we did the analyses of the microtopography, find out some important informations of its description. We studied objects with high reflectivity (plane mirrors and Ronchi ruting) and we obtained good results. Also we compared some results with that obtained by analyses of Fringes of Equal Thickness\'
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Shaft surface topography"

1

Zhao, Bingxi, Qi Yuan, and Pu Li. "Dynamic Analysis and Optimization on Assembly Parameters of Rod Fastening Rotor System With Manufacturing Tolerances." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90256.

Full text
Abstract:
Abstract Rod fastening rotor (RFR), as a typical rotor structure of gas turbine which is different from the integral rotor, is comprised of a set of discs clamped together by a central tie rod or several tie rods on the pitch circle diameters. In process of machining, tolerances of the disc are inevitable, of which the parallelism error and mass imbalance are focused on in this paper. Firstly, the complex bending of RFR by accumulation of parallelism errors of discs is derived through the coordinate transmission. Then the static analysis of RFR is performed to obtain the additional pressure by the effect of unbalanced forces, which is related to the assembly angles and rotating speed, on contact surfaces using a linear hypothesis, based on which the distribution of contact pressure considering the original pre-tightening force is obtained. Then the Bifractal-Regular theory is adopted to acquire the micro-topography of the contact interface and derive the contact stiffness related to normal contact pressure, fractal upper length limit and regular shape of the contact interfaces. After that, the zero thickness element is introduced to obtain the equivalent stiffness matrices of the contact surface. In addition, the circumferential uniformly distributed rods are modeled as a spring element which provides additional bending stiffness for the RFR. Based on the analysis above, the dynamic model of the RFR-bearing system containing 10 discs is established using the Timoshenko beam element where the continuous part of the shaft is modeled by Timoshenko beam element considering shear effect. Finally, the multi-optimization is carried out on the vibration response by the coupled effects of both initial bending and mass imbalance of the RFR-bearing system through which the optimal assembly angles are obtained. The results show a good performance in decreasing vibration as well as bending of the RFR system.
APA, Harvard, Vancouver, ISO, and other styles
2

Khadka, Nishan, Yucheng Yang, John Haug, Milan Palei, Matthew Rosenberger, Anthony Hoffman, and Edward Kinzel. "Ultrafast Laser Texturing of Metal Surfaces: Effects of Process Parameters on Surface Reflectance and Possibility of Hierarchical Structuring." In ASME 2022 17th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/msec2022-85663.

Full text
Abstract:
Abstract Ultrafast laser processing has been widely studied for surface texturing. The complex interaction between the laser energy, plasma, and surface chemistry produces complex morphologies including Laser-Induced Periodic Surface Structures and random higher aspect ratio geometries. Laser texturing allows engineering of metallic surface’s wettability as well as the reflectance on either broadband or narrowband basis. This paper experimentally maps the laser process parameters to the surface morphology and diffuse reflectance for stainless steel, aluminum, and copper substrates. All experiments are conducted with a 1030 nm wavelength, 230 fs pulse length laser in an ambient environment. The results show how the common morphological regimes shift with material and how the reflectance varies with morphology. To further decrease the reflectance, hierarchical structures are generated by first locally micromachining the surface to form a lattice of trenches using the focused laser beam, before texturing the surface with a rastered, defocused laser beam. The micromachined features interact with laser texturing and increase light trapping on the surface. This is a function of the depth and periodicity of the hierarchical structures as well as the surface topography. This approach provides the ability to lower the surface reflectance and add an extra level of control for directing deep micro-cavities along the surface.
APA, Harvard, Vancouver, ISO, and other styles
3

Lino, A. C. L., I. M. Dal Fabbro, A. M. Enes, Niklaus Ursus Wetter, and Jaime Frejlich. "Aplication of Phase Shift Projection Moire Technique in Solid Surfaces Topographic Survey." In RIAO∕OPTILAS 2007: 6th Ibero-American Conference on Optics (RIAO); 9th Latin-American Meeting on Optics, Lasers and Applications (OPTILAS). AIP, 2008. http://dx.doi.org/10.1063/1.2926783.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Jumpertz, R., D. Muigg, R. Oberhuber, W. Ploss, T. Chatterjee, and J. Trogolo. "Voltage Regulator Output Shifts Due to Systematic Oxide Non-Uniformities: Failure Analysis, Layout and Process Solutions." In ISTFA 2004. ASM International, 2004. http://dx.doi.org/10.31399/asm.cp.istfa2004p0512.

Full text
Abstract:
Abstract High volume productions of analog devices require usually more than one production facility. These facilities could be part of the company or in a foundry organization. A smart technology transfer is a key requirement to success. Nevertheless, small deviations of parametric key indices can lead to substantial differences in analog device performance. This paper describes an instructive case study to isolate the root cause of a parametric shift of a low drop output (LDO) voltage regulator. This shift caused a significant yield loss in one of the production facilities. The LDO shift was traced back to a current mirror mismatch. Physical failure analysis shows small differences in the gate oxide thickness which consequently vise versa led to threshold voltage mismatch. Further process analysis identified an unwanted topography in the silicon surface as the root cause of the non-uniform gate oxide growth.
APA, Harvard, Vancouver, ISO, and other styles
5

Loychik, Neil, Mathieu Barraja, Afzal Khan, R. Ryan Vallance, Eric R. Marsh, and Dave A. Arneson. "Mechanical Design of a Precision Instrument for Measuring the Roundness Profiles of Micro Shafts." In ASME 2006 International Manufacturing Science and Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/msec2006-21101.

Full text
Abstract:
This paper presents a new instrument for measuring roundness profiles of axially symmetric micro shafts with diameters below 250 micrometers. The instrument will measure form error in cutting tools used for micro machining, small-hole metrology probes, and other high aspect ratio micro structures. This instrument operates on the same physical principle as scanning tunneling microscopes, which measure surface topography using fluctuations in tunneling of electrons between probe and sample. The instrument will measure roundness profiles using a fixed-sensitive-direction arrangement of the detector, similar to macro scale metrology instruments. Challenges resulting from dimensional scaling necessitate an entirely new instrument compared to conventional instruments. We describe the need for this instrument, its working principle, architecture, the design of the traction drive mechanism, and the design of the nano positioning stages.
APA, Harvard, Vancouver, ISO, and other styles
6

Chang, Shih-Hsiang, Thomas N. Farris, and Srinivasan Chandrasekar. "Contact Mechanics of Superfinishing." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-1027.

Full text
Abstract:
Abstract Superfinishing is an abrasive finishing process in which a smooth work surface is produced by simultaneously loading a bonded abrasive stone against a rotating workpiece surface and oscillating (reciprocating) the stone at high frequencies. The surface topography of a 600 grit aluminum oxide stone used for superfinishing is quantitatively described using scanning phase-shift interferometry. A bounded three-parameter lognormal distribution is found to provide a more accurate representation of cutting edge height distribution than a bounded normal distribution, especially in fitting the upper tail end of data. Moreover, the stone surface characteristics are nearly constant throughout stone life suggesting that superfinishing is a self-dressing process. This stone surface geometry is used to develop a contact mechanics model of the superfinishing process. The model estimates the number of cutting edges involved in material removal, the load distribution on these edges, and the resulting surface roughness of the super-finished surface. The effect of contact pressure on these estimated values has been studied. Only a very small percentage (less than 0.16%) of the cutting edges, which are comprised of the large cutting edges occurring in the tail end of distribution, are actively engaged in material removal. Further, the arithmetic average surface roughness, Ra, is found to be related to the average depth of penetration while the peak-to-valley surface roughness, Rt or Rtm, is related to the maximum depth of penetration. The prediction of surface roughness of this model is found to agree very well with experimental results for superfinishing of hardened steel surfaces.
APA, Harvard, Vancouver, ISO, and other styles
7

Salehi-Khojin, Amin, and Nader Jalili. "An Analytical Modeling Framework for Piezoelectric-Based Microcantilever Actuator/Sensor With Thermal Effects Consideration." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42528.

Full text
Abstract:
In many surface science applications, piezoelctrically-actuated based micro-machines offer outstanding opportunity to detect topography of substrate in the scale of nano-meter. As the tip scan the surface of the sample, the laser beam deflected from the end of cantilever provide information related to nanoscale surface texture. However, application of laser beam to detect deflection of microcantilever beam will raise the local temperature of cantilever. This results in the resonance frequency shift due to the change in the effective stiffness of micro-beam. Therefore, studying the thermal effects on the microbeam is crucial when designing and employing microcantilever. In this study, a new modeling framework is presented for piezoelectrically driven atomic force microscopy (AFM). The piezoelectric layers are used as actuator and sensor attached on the top and bottom side of the cantilever. In our model, the local thermal effect due to laser beam has been also taken into account. The Hamilton’s principle is used to derive the governing equations.
APA, Harvard, Vancouver, ISO, and other styles
8

Chawla, Gaurav, and Santiago D. Solares. "Trimodal Tapping-Mode Atomic Force Microscopy: A Possible Method for Simultaneous Measurement of Conservative and Dissipative Interactions." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47668.

Full text
Abstract:
Multifrequency Atomic Force Microscopy (AFM) techniques, where the cantilever oscillation is measured and sometimes driven at multiple frequencies, have become an active research topic in recent years. This is in part because these methods can provide increased compositional contrast during surface characterization. Since 2004 bimodal AFM imaging has been used extensively to complement the information that can be obtained using the standard single-frequency tapping-mode operation. More recently we have implemented a trimodal tapping-mode scheme, in which we have incorporated a frequency-modulated third eigenmode into bimodal tapping-mode operation in order to acquire topography, phase and frequency shift information simultaneously. We have also studied numerically the effect of different levels of sample stiffness, tip-sample dissipative forces, oscillation amplitudes for each of the eigenmodes and cantilever rest positions above the sample on the frequency response of the higher eigenmodes in bimodal and trimodal operations. Here we explore the ability to separate conservative and dissipative effects using the different channels available in trimodal operation.
APA, Harvard, Vancouver, ISO, and other styles
9

Sanmiquel, Lluís, Marc Bascompta, Josep Ma Rossell, and Hernán Anticoi. "Transmission of the topographic system and orientation from the surface to an underground mine using 2 vertical shafts. Comparison between the classical and gyroscope method." In 6th World Congress on Mechanical, Chemical, and Material Engineering. Avestia Publishing, 2020. http://dx.doi.org/10.11159/mmme20.125.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Hosseini, Mahmoud Reza, and Nader Jalili. "A New Nanomechanical Cantilever Sensing Paradigm Using Piezoelectric Boron Nitride Nanotube-Based Actuation." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35425.

Full text
Abstract:
Nanomechanical Cantilever Sensors (NMCS) have recently attracted a widespread attention for use in different nano- and micro-size applications such as studying the nanoscale surface topography by scanning probe microscopy and atomic force microscopy (AFM). In newer AFM systems, a sharp probe is placed at the tip of the microcantilever and a piezoelectric patch actuator deposited on the cantilever surface produces the movements of the probe above the examined surface. Similar system can be also utilized for mass sensing purposes by adding an unknown mass to the tip and measuring the beam deflection and the amount of shift in the resonance frequency that is caused by the addition of the tip mass. This sensing paradigm finds many applications in medical and biological fields such as DNA strand and bacteria weight measurement. However, one of the major issues in all piezoelectrically-actuated microcantilevers is the low actuation energy of the piezoelectric patch. Most of the current and widely used piezoelectric materials possess low mechanical characteristics such as low Young’s modulus of elasticity, low yield strength and most importantly incompatibility with most biological species and environment. It has been shown that both carbon and boron nitride nanotubes (CNT and BNNT) possess outstanding mechanical, chemical and electrical properties with acceptable piezoelectricity which make them suitable for microcantilever actuation applications. In this paper, a multi-physics multi-scale model is proposed in which the actuation of microcantilevers is produced by two sets of nanotube layers. Through extensive simulations, BNNTs were chosen to be used as the actuators because of their enhanced piezoelectric characteristics compared to CNTs. The modeling framework proposed here is used to investigate the effects of deposited tip mass with different weights on frequency response and resonance frequency of the microcantilever beam. These microbeams are made of aluminum or titanium materials and the results are compared with each other.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Shaft surface topography' for particular source types:
Journal articles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography