An Efficient Approach to Ill-Posed Problem Regularization Applied to an Over-Determined Six-Degree of Freedom Load Cell

Olmi, Giorgio

doi:10.1007/s11340-015-9986-3

Cited by 4 publications

(3 citation statements)

References 34 publications

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“…The entire procedure was repeated for three times for statistical evidence reason, in order to have six readings (three for ascending and three for descending loads) for each step (except for full scale). 7 The obtained characteristic, having an excellent linearity, is shown in Fig. 12(b).…”

Section: A Load Cell For Impact Testsmentioning

confidence: 92%

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Load Cell Training for the Students of Experimental Stress Analysis

Olmi

2016

Exp Tech

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Many numerical models are nowadays available for the structural analysis of complexly shaped structures. However, a critical problem consists of the estimation of the actual loads that a structure withstands. The most proper way to determine them under service conditions consists of executing in-field tests, where load cells have an important role. This article deals with a didactic project at the University of Bologna, focused on the development of strain gage load cells, from design to calibration and use. Details are provided on the course units involved and on the levels of teaching, and three case studies are presented. Two case studies deal with the design of decoupled load cells, using simple beam geometry. Students had the opportunity to become confident with the principles of mechanics and to tackle the not trivial activities like calibration by decoupled load application and determination of the related matrices. The third one deals with the development of a load cell for impact loads, where the students had the chance to observe a practical application of the studied Wheatstone bridge connection, to participate in on-field tests, and to better understand the close relationship between experimentation and design.

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Section: A Load Cell For Impact Testsmentioning

confidence: 92%

“…Each trial was repeated three times for statistical evidence reasons. 7,22,23 Some photos of the loading trials are shown in Fig. 4.…”

Section: A Load Cell For the Simultaneous Measurement Of Three Forcesmentioning

confidence: 99%

Load Cell Training for the Students of Experimental Stress Analysis

Olmi

2016

Exp Tech

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“…Many contributions in literature proved that performing in-field tests, usually with strain gage equipment, is often the only way to reliably determine the states of stress and strain in the operation conditions. [19][20][21][22][23][24][25][26][27][28] The rotating ring has been suitably instrumented by electrical strain gages, bonded at the sections where the concentrated loads are applied. In particular, four strain gages (CEA-XX-125-UW-120, Manufacturer: Vishay, Malvern, PA, USA) have been used and aligned along the tangential direction of the ring: their collocations in the ring cross section are shown in Figure 14(a) and (b).…”

Section: Experimental Validationmentioning

confidence: 99%

A user-friendly computational algorithm for the structural analysis of wrapping machine rotating rings

Croccolo

Agostinis

Fini

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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Wrapping machines usually consist of a two-or a four-column frame, supporting a huge rotating ring, connected to a prestretch unit with film coil carrier. Stiffness is a key point of packaging machines, since it is strictly related to the accuracy of the wrapping task. It depends on the stiffness of the frame, which can be achieved by the four-column architecture, and on the ring constraint system. As a consequence, the ring structures are usually highly statically indeterminate. Nowadays, there is an increasing demand for higher rotational speeds and more reduced operation times. Therefore, an accurate structural analysis of the ring, considering its actual loading and constraints is more and more important. The structural analysis of the rotating ring is treated by many references; however, such a statically indeterminate constraining makes this problem highly complicated. The goal of this paper consists in the development of a general and original computational algorithm for the structural analysis of rotating rings. The results are collected in a user-friendly way in terms of normalized internal loads, so that they can be of a great help even for not expert users. This model has been experimentally validated and easily applied to case studies and optimization tasks.

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