DESIGN OF A LOAD CELL WITH LARGE OVERLOAD CAPACITY

2010 ◽  
Vol 34 (3-4) ◽  
pp. 449-461 ◽  
Author(s):  
Farhad Aghili
Keyword(s):  
Large Strain ◽  
Load Cell ◽  
Load Force ◽  
Strength Analysis ◽  
Special Design ◽  
Sensor Material ◽  
Overload Protection ◽  
Sensor Structure ◽  
Margin Of Safety ◽  
Overload Capacity

To increase the signal-to-noise (S/N) ratio and sensitivity of a load cell, it is desirable to design a structure that generates large strain close to maximum allowable strain of the sensor material for a given rating load force. However, accommodating the margin of safety with respect to overloading, compromises the sensitivity. This paper presents the design, analysis, and prototype testing of a load cell which can provide large overload protection capacity without compromising the sensitivity of the sensor. This is achieved by a special design of sensor structure that becomes virtually rigid after its flexures reach their maximum deflection, thereby the sensor can be protected against a large over load. The sensor dimensions, which maximizes the sensor’s sensitivity, for given values of rating load and overload are obtained through mechanical strength analysis. A load cell prototype is fabricated and then tested to measure its linearity and overload characteristics. The experimental results show an accuracy of 0.2% of full scale and overload protection of the sensor flexures.

scholarly journals Granular metal–carbon nanocomposites as piezoresistive sensor films – Part 2: Modeling longitudinal and transverse strain sensitivity

2018 ◽  
Vol 7 (1) ◽  
pp. 69-78 ◽  
Author(s):  
Silvan Schwebke ◽  
Ulf Werner ◽  
Günter Schultes
Keyword(s):  
Electron Transport ◽  
Large Strain ◽  
Local Strain ◽  
Carbon Matrix ◽  
Morphological Characterization ◽  
Transverse Strain ◽  
Strain Sensitivity ◽  
Sensor Material ◽  
Piezoresistive Sensor ◽  
Disordered Films

Abstract. Granular and columnar nickel–carbon composites may exhibit large strain sensitivity, which makes them an interesting sensor material. Based on experimental results and morphological characterization of the material, we develop a model of the electron transport in the film and use it to explain its piezoresistive effect. First we describe a model for the electron transport from particle to particle. The model is then applied in Monte Carlo simulations of the resistance and strain properties of the disordered films that give a first explanation of film properties. The simulations give insights into the origin of the transverse sensitivity and show the influence of various parameters such as particle separation and geometric disorder. An important influence towards larger strain sensitivity is local strain enhancement due to different elastic moduli of metal particles and carbon matrix.

scholarly journals Static Strength Analysis of Meat Grinder Frame

2021 ◽  
Vol 2 (6) ◽  
pp. 2179-2186
Author(s):  
Abdul Rahman Agung Ramadhan ◽  
Eko Aprianto ◽  
Abdul Muchlis
Keyword(s):  
Safety Factor ◽  
Theoretical Calculations ◽  
Essential Amino Acids ◽  
Static Strength ◽  
Load Force ◽  
Percentage Error ◽  
Strength Analysis ◽  
Grinding Machine ◽  
Von Mises ◽  
Error Percentage

Meat is one of the agricultural commodities needed to meet protein needs, because meat contains high quality protein, which is able to contribute complete essential amino acids. The purpose of this paper is to design, analyze the static strength of the frame based on theoretical calculations and simulations on solidwork 2018 software. This machine consists of a frame, reservoir, grinding shaft, transmission, and electric motor. The results of the design obtained a Meat Grinding Machine with Length: 610 mm, Width: 500 mm and Height: 750 mm. The material used is 2024-O Alloy with a modulus of elasticity of 72,400 N/mm2. The load force obtained is 576.32 N. And the value from the analysis is the displacement value of 0.174 mm and for theoretical calculations, the displacement value is 0.176 mm. So, the value of the percentage error is 1.176%. For the von Mises value of 68,970 MPa, and for calculations based on the theory, the von Mises value is 52,499 MPa. So, the value of the error percentage is 0.238%. And for the value of the safety factor obtained a value of 1,087, and for calculations based on the theory, the value of the safety factor is 1.428. So, the value of the error percentage is 0.313%.

Overload Protection Mechanisms for Force Detecting Beam in a Force Sensor

2008 ◽  
Vol 20 (2) ◽  
pp. 316-321
Author(s):  
Koyu Abe ◽  
◽  
Masaru Uchiyama
Keyword(s):  
Force Sensor ◽  
Force Sensors ◽  
Parallel Beam ◽  
Protection Mechanism ◽  
Overload Protection ◽  
Sensor Structure ◽  
Protection Mechanisms ◽  
External Impact

Overload prevention is important in force sensors to avoid fatal damage due to unexpected external impact. Until now, some mechanisms using screws or straight pins have been proposed for preventing damage to the sensor. However, nothing has been reported regarding the utility of this mechanism. The unidirectional force sensor based on an H-slit type parallel beam we proposed in previous work. This sensor structure alone can be realized for overload prevention without any other parts and can be embedded as overload protection mechanism in the structure. In this paper, we verify the utility of conventional type's mechanisms and evaluate the usefulness of the slit type one which we have developed.

LTCC Post Load Cell

2006 ◽  
Vol 3 (4) ◽  
pp. 169-176
Author(s):  
Mário R. Gongora-Rubio ◽  
M. Roberti ◽  
Z M. da Rocha ◽  
L Fraigi
Keyword(s):  
Low Temperature ◽  
Thick Film ◽  
Strain Gage ◽  
Mechanical Load ◽  
Cell Structure ◽  
Compressive Load ◽  
Compressive Force ◽  
Load Cell ◽  
Strain Level ◽  
Load Force

This paper presents the development of a force post compressive load cell, fabricated using Low Temperature Cofired Ceramics (LTCC) technology. It was implemented as an LTCC mechanical load cell structure with a z-axis thick film strain gage using two different approaches. Fabrication methods and materials are explored in this work and fabricated devices are presented. This paper will also present the results of initial electromechanical sensitivity to load force and temperature tests. Compressive force behavior is consistent, in a strain level up to 1.500 micro-strain.

A Discrete Algorithm for Overload Protection Principle

2014 ◽  
Vol 543-547 ◽  
pp. 1219-1222 ◽  
Author(s):  
Chun You Zhang ◽  
Wei Yan
Keyword(s):  
Real Time ◽  
Intelligent Control ◽  
Temperature Rise ◽  
Recursive Algorithm ◽  
Internal Temperature ◽  
Model Based ◽  
Overload Protection ◽  
Heat Effects ◽  
Overload Capacity ◽  
Winding Insulation

Research thermal overload protection not only to protect the motor winding insulation damage due to temperature is too high, also can give full play to the overload capacity of the motor. This paper proposed overload protection model based on heat effects, and deduces the motor internal discrete recursive algorithm of temperature-rise calculation. Based on this algorithm, we constructed the motor internal temperature-rise model, which can calculate temperature-rise of the motor in real-time, and realized the intelligent control of the motor.

What Is Right? A Character-Strength Analysis

2009 ◽  
Author(s):  
Linda L. Moore ◽  
Daniel J. Van Ingen
Keyword(s):  
Strength Analysis ◽  
Character Strength

Investigations of the polyaniline and nafion bilayer sensor structure in SAW system

2006 ◽  
Vol 137 ◽  
pp. 99-102 ◽  
Author(s):  
W. P. Jakubik ◽  
M. Urbańczyk ◽  
E. Maciak
Keyword(s):  
Sensor Structure

Validation of Numerical Models Used for Designing the Composite Blade for ILX-27 Rotorcraft

2019 ◽  
Vol 2019 (4) ◽  
pp. 23-31
Author(s):  
Jakub Wilk ◽  
Radosław Guzikowski
Keyword(s):  
Epoxy Composite ◽  
Numerical Models ◽  
Experimental Studies ◽  
Strength Analysis ◽  
Laminate Glass ◽  
Composite Blade ◽  
Real Objects ◽  
Validation Procedure ◽  
Research Objects ◽  
Comparison Of The Results

Abstract The paper presents the validation procedure of the model used in the analysis of the composite blade for the rotor of the ILX-27 rotorcraft, designed and manufactured in the Institute of Aviation, by means of numerical analyses and tests of composite elements. Numerical analysis using finite element method and experimental studies of three research objects made of basic materials comprising the blade structure – carbon-epoxy laminate, glass-epoxy composite made of roving and foam filler – were carried out. The elements were in the form of four-point bent beams, and for comparison of the results the deflection arrow values in the middle of the beam and axial deformations on the upper and lower surfaces were selected. The procedure allowed to adjust the discrete model to real objects and to verify and correct the material data used in the strength analysis of the designed blade.

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