Computational Surface and Roundness Metrology

Muralikrishnan, Balasubramanian; Raja, J.

doi:10.1007/978-1-84800-297-5

Cited by 114 publications

(28 citation statements)

References 51 publications

(56 reference statements)

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“…Figure 5 presents the evaluation results concerning the cylindricality errors of the shafts, which were evaluated by using a Gaussian filter with a cut-off of 150 UPR (undulations per revolution). 39 The evaluation results of cylindricity errors on the journal bearing working surface of the six shafts were 1.50, 0.91, 1.39, 1.38, 2.76, and 2.28 μm, respectively. It can be observed that the cylindricity error values of shafts 1-4 are relatively small, all within 1.50 μm, while the cylindricity error values of shafts 5 and 6 range between 2 and 3 μm.…”

Section: Data Acquisition and Processing Of Numerical Analysismentioning

confidence: 93%

Influence of shape errors and inertia effects on the error motion of the aerostatic spindle

Zhang,

Zheng,

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this study, an extended Reynolds equation incorporating the shape errors and the inertia effects of compressible fluid was formulated. The pressure-solving equation for the gas film was constructed using a second-order finite difference method. By combining the measurement data from the cylindricity of multiple shafts obtained from a cylindricity measuring instrument, the variation of the aerostatic bearing load capacity with the rotation of the shaft was calculated, both with and without considering the inertia effect. An experimental rig was also constructed to measure the error motion data of the corresponding shaft. The results of numerical analysis and experimental validation demonstrated that shafts with larger cylindricity error values exhibit greater deviations in the calculated bearing load capacity, which correspondingly leads to larger radial error motion values measured in the experiment. When the roundness error value of the shaft is small or the shaft speed is low, the influence of inertial effects on the calculation results of the load capacity deviation is minimal and can generally be disregarded.

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Section: Data Acquisition and Processing Of Numerical Analysismentioning

confidence: 93%

Influence of shape errors and inertia effects on the error motion of the aerostatic spindle

Zhang,

Zheng,

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…As many of these parameters were shown to be correlated with one another, only a few independent parameters were analyzed more in depth. 21 , 31 , 32 , 33 These were the average surface roughness

and surface waviness

, the surface polarity skewness

and

, and the waviness peak to valley height,

. These parameters are explained in more detail in the Appendix A .…”

Section: Methodsmentioning

confidence: 99%

Surface texture analysis of different focal knee resurfacing implants after 6 and 12 months in vivo in a goat model

Aşık

Damen

Hugten

et al. 2022

Journal Orthopaedic Research

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The clinical success of osteochondral implants depends significantly on their surface properties. In vivo, an implant may roughen over time which can decrease its performance. The present study investigates whether changes in the surface texture of metal and two types of polycarbonate urethane (PCU) focal knee resurfacing implants (FKRIs) occurred after 6 and 12 months of in vivo articulation with native goat cartilage. PCU implants which differed in stem stiffness were compared to investigate whether the stem fixating the implant in the bone influences surface topography. Using optical profilometry, 19 surface texture parameters were evaluated, including spatial distribution and functional parameters obtained from the material ratio curve. For metal implants, wear during in vivo articulation occurred mainly via material removal, as shown by the significant decrease of the core‐valley transition from 91.5% in unused implants to 90% and 89.6% after 6 and 12 months, respectively. Conversely, for PCU implants, the wear mechanism consisted in either filling of the valleys or flattening of the surface by dulling of sharp peaks. This was illustrated in the change in roughness skewness from negative to positive values over 12 months of in vivo articulation. Implants with a softer stem experienced the most deformation, shown by the largest change in material ratio curve parameters. We therefore showed, using a detailed surface profilometry analysis, that the surface texture of metal and two different PCU FKRIs changes in a different way after articulation against cartilage, revealing distinct wear mechanisms of different implant materials.

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“…Then, roughness measurement parameters were calculated for the height data along each segment as characterization measures. The amplitude roughness parameters can be defined in terms of the probability distribution of the heights throughout the surface [29,30]. The standard deviation of heights (STD) was assessed by using the following equation:…”

Section: Physical and Chemical Characterization Of The Membranesmentioning

confidence: 99%

ZnO nanoparticles-modified polycaprolactone-gelatin membranes for guided/bone tissue regeneration, antibacterial and osteogenic differentiation properties

Prado-Prone

Silva-Bermúdez

Rodil

et al. 2023

Biomed. Phys. Eng. Express

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Periodontitis is a highly prevalent infectious disease that causes the progressive destruction of the periodontal supporting tissues. If left untreated, it can lead to tooth loss impairing oral function, aesthetics, and the patient’s overall quality of life. Guided and Bone Tissue Regeneration (GTR/BTR) are surgical therapies based on the placement of a membrane that prevents epithelial growth into the defect, allowing the periodontal/bone cells (including stem cells) to regenerate or restore the affected tissues. The success of these therapies is commonly affected by the local bacterial colonization of the membrane area and its fast biodegradation, causing postoperative infections and a premature rupture of the membrane limiting the regeneration process. This study presents the antibacterial and osteogenic differentiation properties of polycaprolactone-gelatin (PCL-G) electrospun membranes modified with ZnO nanoparticles (ZnO-NPs). The membranes´ chemical composition, surface roughness, biodegradation, water wettability, and mechanical properties under simulated physiological conditions, were analyzed by the close relationship with their biological properties. The PCL-G membranes modified with 1, 3, and 6 wt.% of ZnO-NPs showed a significant reduction in the planktonic and biofilm formation of four clinically relevant bacteria; A. actinomycetemcomitans serotype b, P. gingivalis, E. coli, and S. epidermidis. Additionally, the membranes presented appropriate mechanical properties and biodegradation rates to be potentially used in clinical treatments. Notably, the membranes modified with the lowest concentration of ZnO-NPs (1 wt.%) stimulated the production of osteoblast markers and calcium deposits in human bone marrow-derived mesenchymal stem cells (BM-MSC) and were biocompatible to human osteoblasts cells (hFOB). These results suggest that the PCL-G membranes with 1 wt.% of ZnO-NPs are high-potential candidates for GTR/BTR treatments, as they were the most effective in terms of better antibacterial effectiveness at a lower NPs-concentration while creating a favorable cellular microenvironment for bone growth.

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Computational Surface and Roundness Metrology

Cited by 114 publications

References 51 publications

Influence of shape errors and inertia effects on the error motion of the aerostatic spindle

Influence of shape errors and inertia effects on the error motion of the aerostatic spindle

Surface texture analysis of different focal knee resurfacing implants after 6 and 12 months in vivo in a goat model

ZnO nanoparticles-modified polycaprolactone-gelatin membranes for guided/bone tissue regeneration, antibacterial and osteogenic differentiation properties

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