Fundamentals of Machine Elements

Schmid, Steven R.; Hamrock, B. J.; Jacobson, Bo

doi:10.1201/b17120

Cited by 92 publications

(64 citation statements)

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“…Representative free stream velocity magnitude values of the carrier gas around the holder were used to estimate the Pe.F or the FEA and CFD analyses,asummary of boundary conditions, thermal properties of substances,d etails of the simulations and postprocessing of results are given in Appendix A. [18,21,22,[25][26][27][28][29][30][31][32][33][34][35]…”

Section: Pyrolysis Systemmentioning

confidence: 99%

Heat and Mass Transfer Effects in a Furnace‐Based Micropyrolyzer

2016

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Microgram‐scale reactors combined with gas chromatography (GC) coupled to mass spectrometry (MS) or flame ionization detection (FID) are used widely in pyrolysis research. Whether these devices meet the expected fast heating rates and short vapor residence times of fast pyrolysis have not been verified. In this study, experiments and simulations are used to investigate heat and mass transfer in a furnace‐based micropyrolyzer. Surprisingly, heating rates obtained from the temperature history of sample cups in the reactor were modest compared to the greater than 1000 K s−1 heating rates sometimes assumed for such reactors. The heating rate at 773 K, employed commonly in fast pyrolysis, was only 180 K s−1. The highest rate observed was 494 K s−1 at a furnace temperature of 1268 K, which is well above typical pyrolysis temperatures. The mass transfer of volatilized samples was studied using both an optically accessible furnace and computational fluid dynamics. The standard sample cups used with these micropyrolyzers impede the escape of vapors. The use of shallow perforated cups overcame this mass transfer limitation to lead to levoglucosan yields ≈10 % higher than usually reported for the pyrolysis of cellulose.

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Section: Pyrolysis Systemmentioning

confidence: 99%

Heat and Mass Transfer Effects in a Furnace‐Based Micropyrolyzer

2016

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“…In AGMA bevel standards, many authors use the actual gear teeth number on the bevel gears [1,2,3,6,30], to evaluate the Z I factor. However, some authors [31], use the virtual spur gear teeth number to evaluate the Z I factor.…”

Section: Ijret: Internationalmentioning

confidence: 99%

A Comparative Study of Contact Stress From Different Standards for Some Theoretical Straight Bevel Gear Pairs

Osakue¹

2018

IJRET

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ANSI/AGMA 2003-B97, ISO 10300 standards and a new contact stress model are used to estimate and compare contact stresses in some theoretical straight bevel gear pairs. The contact stress expressions in the different gear standards and new model are formatted to highlight the similarity and differences. The power range of 10 to 15,000 kW, backend modules of 2.5 to 25 mm and backend pitch velocities of 4.58 to 25.37 m/s are covered. The results indicate that the percentage differences between the new contact stress and AGMA models are in the range of 2.22% to 7.40%. These differences are small but can mean significant improvement in the pitting life expectancy of the gears since life and contact stress is related by a power law of approximately 9th degree. For example, a 5% decrease in contact stress could mean a pitting life increase of about 50%. The percentage differences between the new and ISO 10300 models contact stresses are in the range of-6.57% to 67.34%. These are large differences, indicating that much shorter pitting life should be expected based on the ISO model. The differences from The ISO 10300 standards may be attributed to the use of the mid facewidth cone radius in its contact stress model while the new model and AGMA standards use the backend cone radius which is larger than the mid facewidth cone radius. Another contributing factor to the differences is that the load service factor values evaluated from ISO methods are generally higher than those of the new model values which are based largely on AGMA methods. Since the ANSI/AGMA standards yield results that are considered to be conservative and the new contact stress model gives values that are marginally lower than the AGMA predictions, the new contact stress model deserves some serious considerations.

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“…The spring stiffness can be calculated according to the following equation as a function of the thread diameter, , the spring diameter, , the shear modulus, , and the number of free turns, [12]:…”

Section: Mechanicalmentioning

confidence: 99%

A Framework for Multidisciplinary Optimization of a Balancing Mechanism for an Industrial Robot

Persson

Feng

Wappling

et al. 2015

Journal of Robotics

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The paper presents a framework that can be used to design and optimize a balancing mechanism for an industrial robot. The framework has the capability to optimize three different concepts: a mechanical, a pneumatic, and a hydropneumatic. Several disciplines are included in the framework, such as dynamic and static analyses of the robot performance. Optimization is performed for each concept and the obtained optimal designs are all better than the reference design. This means that the framework can be used as a tool both to optimize the balancing mechanism and also to support concept selection.

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Fundamentals of Machine Elements

Cited by 92 publications

References 0 publications

Heat and Mass Transfer Effects in a Furnace‐Based Micropyrolyzer

Heat and Mass Transfer Effects in a Furnace‐Based Micropyrolyzer

A Comparative Study of Contact Stress From Different Standards for Some Theoretical Straight Bevel Gear Pairs

A Framework for Multidisciplinary Optimization of a Balancing Mechanism for an Industrial Robot

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