Mechanical Problems in Measuring Force and Mass

ISBN-13: 9789401084642 / Angielski / Miękka / 2013 / 333 str.

H. Wieringa

Opis

Nowadays electrical force transducers, in which various electrical conversion principles are applied, are widely used. Transducers for forces from 1N till 10 MN are commercially available and used for industrial as well as research purposes. They not only serve to measure forces but also for weighing purposes. Directly converting a force into an electrical signal is not possible. This must be done step by step. For instance, in a strain gauge based transducer the conversion chain is: force - stress - strain - resistance change - bridge output. At every conversion point in this chain parasatic influences can interfere with the results and may cause a loss in accuracy. To surmount the problems related to obtaining sufficient accuracy and reliability for these transducers, much research has been done allover the world in the past 35 years. As a result, new materials, new techniques, improved constructional designs and compensation circuits have been found to overcome the parasitic influences. The object of the IMEKO Conferences on behalf of the Technical Committee on Measurement of Force and Mass (TC-3) is to exchange experiences, to discuss problems and to obtain knowledge about practical applications. In this book the papers have been collected that will be discussed at the 11th International Conference on Measurement of Force and Mass. The topic of this conference is "Mechanical Problems in Measuring Force and Mass".

Spis treści

1. Development of Multicomponent Force Transfer Standards by ONERA for French BNM.- 2. Development, Testing and Specifications of Super Precision Force Transducers for International Comparison Measurements.- 3. Measurement of Force by Means of Fiber-Optic Sensors.- 4. Fiber Optic Load Sensor as a Microcomputer Peripheral.- 5. A New Design for 6-Component Force/Torque Sensors.- 6. A Directly Weighing Suspension Balance with Frequency Variant Output.- 7. Microprocessor-Based System for Belt-Scales Dosing of Mixed Feed Components.- 8. A Contribution to the Analysis of Conveyor Belt Weighing Errors.- 9. Feeding Control of Automatic Bagging Scale.- 10. Weighing in Roadvehicles.- 11. In-Motion Weighing Scale and Some Problems of Its Metrological Evaluation.- 12. 6-Component Load Cell for Automobile Wheel.- 13. Measurement Uncertainty in the Determination of Weight and Centre of Gravity of Offshore Modules Using Strain Gauge Load Cells.- 14. The Measurement Method of Big Torque Moments in Drive Shafts.- 15. Movable Electronic Locomotive Scale with Microprocessor.- 16. Improvement of the Weighing Accuracy of a 50 KG Beam Balance.- 17. Decoding of the State of Scales Equilibrium by Microprocessor Scales Terminal.- 18. Application of a New Beam Type Loadcell to Mechanical Hand.- 19. A New Bending Test Method of Leaf Springs.- 20. A Calibration Instrument for Roller Brake Testers.- 21. Characteristic Data of Force Transducers Terms and Definitions.- 22. A Compensating Lever and Its Control System for Compensating the Force of the Frame of a Deadweight Force Standard Machine.- 23. Some Calibration and Test Facilities at VSL.- 24. A Group Verification System for Force Standard Machines Using High Precision Load Cells.- 25. Calibration and Classification of Force Transducers by Using a Traceable Set of High-Performance Facilities.- 26. About the Uncertainty of the Higher Capacity Primary Standard and the Dissimination of Force in the ASMW.- 27. High Accuracy Calibration Methods for Force Transducers.- 28. Evaluation of Parasitic Components on National Deadweight Force Standard Machines.- 29. The Effect of Time Response of Force Transducers on Their Transfer Properties in Force Comparisons.- 30. Calibration and Verification of Multicomponent Dynamometers in the Meganewton Range.- 31. Investigation of the Calibration Signal of Force Measuring Devices.- 32. Eccentric Load Sensitivity of Force Sensors.- 33. Ways for the Removal of the Main Disadvantages of Force Transducers with Semiconductor Strain Gages.- 34. Improving Creep Performance of the Strain Gage Based Load Cell.- 35. Temperature Effect and Compensation of Strain Gage Load Cell.- 36. Pilot Tests to Determine Micro-Elastic Effects in Load Cell Receptor Materials.- 37. Creep of Low-Range-Scales.