Recent Evolution of Smart Force Transducers

2020 ◽  
pp. 189-202
Author(s):  
Dan Mihai Ştefănescu
Keyword(s):  
Force Transducers

scholarly journals Calibration of Transducers and of a Coil Compression Spring Constant on the Testing Equipment Simulating the Process of a Pallet Positioning in a Rack Cell

2019 ◽  
Vol 9 (1) ◽  
pp. 631-640 ◽  
Author(s):  
Leopold Hrabovský ◽  
David Dluhoš
Keyword(s):  
Control System ◽  
Strain Gauge ◽  
Testing Equipment ◽  
Pressure Force ◽  
The Third ◽  
Force Transducers ◽  
Compression Spring ◽  
Computer Controlled ◽  
Automated Process ◽  
Principal Design

AbstractIn a parking house with KOMA TOWER computer-controlled automated parking system it happens that a control system is locked out of service after a pallet has failed to reach the required position during the shifting of pallets, loaded with cars, into rack cells.In this paper is described testing equipment designed by the Institute of Transport, Faculty of Mechanical Engineering, VŠB Technical University of Ostrava for the purpose of simulating the process of pallets shifting into the rack cells in order that the frequency of error messages from the control system during the automated process of cars positioning in rack cells in the parking house may be limited.The paper details two completed parts of the designed testing equipment which provide for the calibration of strain-gauge force transducers and for the detection of coil compressive spring compression in relation to acting pressure force.The description of the third, principal design part will be provided in the next paper, together with the experimentally measured acting forces which generate, in both horizontal and vertical directions, as a pallet brake pulley rolls along a brake haunch length.

Abstract 241: Endothelial Function is Preserved with Endoscopic Vein Harvest for Lower Extremity Bypass

2015 ◽  
Vol 35 (suppl_1) ◽  
Author(s):  
Adam R Wheeler ◽  
Daniel E Kendrick ◽  
Matthew T Allemang ◽  
Andre F Gosling ◽  
Anil Nagavalli ◽  
...  
Keyword(s):  
Minimally Invasive ◽  
Lower Extremity ◽  
Endothelial Function ◽  
Endothelial Damage ◽  
Krebs Solution ◽  
Force Transducers ◽  
Submaximal Contraction ◽  
Harvesting Techniques ◽  
Harvest Techniques ◽  
Bypass Technique

Objective: Endoscopic vein harvest for lower extremity arterial bypass technique has been questioned due to concern for endothelial damage during procurement. We sought to compare NO mediated endothelial dependent relaxation (EDR) in vein segments harvested with open surgical (OH) versus endoscopic (EH) techniques. Methods: Saphenous vein segments were harvested for lower extremity bypass. 3-4mm vein rings were mounted on force transducers. Segments were mounted in 37° oxygenated Krebs solution and maximally contracted using KCl. NE was used to achieve submaximal contraction. EDR was determined using increasing concentrations of bradykinin (BDK). Endothelial independent relaxation was confirmed using sodium nitroprusside. Two-way ANOVA was used to analyze differences between harvest techniques across BDK concentration. Student t-test was used to examine nitrite levels in each cohort. Results: Vein segments harvested from patients (n=13) led to 28 rings (11 rings; 5 patients EH v. 17;8 OH). Both cohorts achieved moderate relaxation to maximal BDK concentration, [10 -6 M]; (49.5% EH vs. 40.55%, OH, P = .270). Analysis by two way ANOVA for mean % relaxation for BDK concentration [10 -11 - 10 -6 M] showed improved EDR in EH samples compared to OH (P =.029). Mean nitrite tissue bath concentration measurements post-BDK were 279 nM (EH) v. 194 nM (OH) (P = .264). Histology and IHC confirmed intact endothelium by morphometric analysis and CD31 staining. Conclusion: Endothelial function is preserved when utilizing endoscopic harvesting techniques. The advantages of minimally invasive vein procurement for lower extremity bypass can be obtained without concern for damaging venous endothelium.

Pharmacological Characterization of Postjunctional α-Adrenoceptors in Human Nasal Mucosa

2005 ◽  
Vol 19 (5) ◽  
pp. 495-502 ◽  
Author(s):  
Michel R. Corboz ◽  
Maria A. Rivelli ◽  
Lori Varty ◽  
Jennifer Mutter ◽  
Mark Cartwright ◽  
...  
Keyword(s):  
Nasal Mucosa ◽  
Isometric Force ◽  
Ringer Solution ◽  
Predominant Role ◽  
Pharmacological Characterization ◽  
Human Nasal Mucosa ◽  
Force Transducers ◽  
Arteries And Veins

Background Functional α1- and α2-adrenoreceptor subtype pharmacology was characterized in an in vitro human nasal mucosa contractile bioassay. Methods Nasal mucosa was obtained from 49 donor patients and mucosal strips were placed in chambers filled with Krebs–Ringer solution and attached to isometric force transducers. Results Nonselective α-adrenoreceptor agonists epinephrine, norepinephrine, and oxymetazoline produced concentration-dependent contractions of isolated human nasal mucosa (pD2= 5.2, 4.9, and 6.5, respectively). The α2-adrenoreceptor agonist BHT-920 (10 μM)–induced contractions were blocked by yohimbine (0.01–1 μM) and prazosin (0.01–1 μM) inhibited the contractile response to the α1-adrenoreceptor agonist phenylephrine (10 μM). Histological analysis showed that phenylephrine and BHT-920 differentially contracted the arteries and veins of human nasal mucosa, respectively. Conclusion Our results indicate that functional α1- and α2-adrenoceptors are present and functional in human nasal mucosa. The a 2-adrenoceptors display a predominant role in contracting the veins and the α1-adrenoceptors appear to preferentially constrict the human nasal arteries.

scholarly journals Transient load simulation of forwarder rear frame

2017 ◽  
Vol 50 (2) ◽  
pp. 77-96
Author(s):  
Juho Sormunen
Keyword(s):  
Time Integration ◽  
Strain Gauges ◽  
Test Machine ◽  
Reasonable Accuracy ◽  
Physical Test ◽  
Explicit Time Integration ◽  
Transient Load ◽  
Force Transducers ◽  
Load Simulation ◽  
Linear Nature

One difficulty in the design of the load bearing components of mobile machines is the transient and non-linear nature of the loads acting on them. A common method for tracking these loads is to use strain gauges and force transducers on a physical test machine. An alternative method for determining the transient loads by means of a mathematical model that intends to describe the response of a John Deere 1010E forwarder as it crosses a test track is utilized in this study. The model is based on finite element method and it is solved using explicit time integration and LS-DYNA® software. As a result of this study a model capable of replicating the real world with a reasonable accuracy was obtained. The forces acting on tires, which can be considered the most important results of this work, can be used as boundary conditions in consequent analyses, such as fatigue simulation.

scholarly journals Self-Assembling Biological Springs Force Transducers on the Micron Nanoscale

2016 ◽  
Author(s):  
George Benedek ◽  
Alfred H. Casparay
Keyword(s):  
Self Assembling ◽  
Force Transducers
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