dynamometer

(redirected from Dyno)
Also found in: Dictionary, Thesaurus, Medical.

dynamometer

any of a number of instruments for measuring power or force

Dynamometer

 

a device for measuring force or moment; it consists of a force component (elastic element) and a reading device. In the force component, the force to be measured is converted to a deformation, which is transmitted to the reading device directly or through a gear mechanism. Dynamometers can measure forces ranging from several newtons (fractions of a kilogram-force) to 1 meganewton (100 tons-force). According to their principle of operation, a distinction is made among mechanical (spring or lever), hydraulic, or electrical dynamometers. Two principles of operation are sometimes used in the same dynamometer. Dynamometers are distinguished according to purpose as reference and operational (general-purpose and special) types.

Reference dynamometers are intended for testing and calibrating operational dynamometers and for monitoring the stresses of machines during the testing of the mechanical properties of various materials and products. Reference dynamometers are categorized as first-class, second-class, or third-class according to their degree of accuracy. First-class dynamometers are designed for checking second-class reference dynamometers, which in turn are used for testing and calibrating third-class dynamometers and for checking general-purpose dynamometers. Third-class dynamometers are used for checking and calibrating testing machines and devices; they are built with elastic elements in the form of locking clamps of the bending-strain type and locking clamps or bars that undergo compressive or tensile strain.

General-purpose operational dynamometers are used for measuring the tractive force of farm and truck tractors, locomotives, and oceangoing and river tugboats (drawbar dynamometers), as well as for determining the forces that develop in structures and machinery during the application of external forces. Special-purpose operational dynamometers are used for determining torque moments, the pull force of aircraft and hydraulic propellers, braking forces, and cutting and feed forces. In metal-cutting lathes and similar machines they are often not separate devices but are incorporated into a complex of testing devices (dynamometric insert, dynamometric wheel, and so on). Operational dynamometers are divided into two classes according to their accuracy: the first class has an error of ±1 percent, and the second class has an error of ±2 percent (of the limiting value of the load). Dynamometers with recording devices are called dynamographs, and dynamometers with reading or indicating devices are called gauges.

Electrical dynamometers, which consist of a transducer to convert the deformation to an electric signal and a secondary device to amplify and record the signal, are the most promising types. Resistance (tensoresistance), inductance, piezoelectric, and vibration-frequency transducers are used. The most widely used type is the resistance transducer, with an elastic element and tensoresistance grids. When a load is applied, the elastic element and the tensoresistance grids are deformed, causing an imbalance in the currents of the resistance bridge to which the grids are connected. The signal is amplified and recorded by the secondary device, which has a scale graduated in units of force.

Medical dynamometers are designed for measuring the force of various muscle groups in the human body. In some medical dynamometers the measurement of the force is based on the compression of a metal spring connected to a dial indicator. Mercury, hydraulic, electrical, and pendulum medical dynamometers are also used. The multidynamometer machine developed by A. V. Korobkov and G. I. Cherniaev, which makes it possible to isolate the action of various muscle groups and to measure their force under equal conditions, is widely used.

REFERENCES

Malikov, G. F., A. L. Shneiderman, and A. M. Shulemovich. Raschety uprugikh tenzometricheskikh elementov. Moscow, 1964.
Osokina, A. P. Tipizatsiia ispytatel’nykh mashin i vesoizmeritel’nykh priborov. Moscow, 1965.

S. I. GAUZNER

dynamometer

[‚dī·nə′mäm·əd·ər]
(engineering)
An instrument in which current, voltage, or power is measured by the force between a fixed coil and a moving coil.
A special type of electric rotating machine used to measure the output torque or driving torque of rotating machinery by the elastic deformation produced.
References in periodicals archive ?
With Dyno Nobel's BenchMark PC-based blast design software, blast designs and timing can easily be transferred from the PC to the DigiShot Plus Bench Box.
With this certification, Dyno Nobel has not only proven its commitment to continuously improving safety and health at its operations, but also marked a significant milestone.
The report covers the present scenario and the growth prospects of the Global Automotive Dyno Market for 2016-2020.
Franchise Investments Durham and Benjamin Franklin have formed a relationship over the past two years since Dyno began attending the Direct Energy Conference in America, run by the US franchise's parent company.
Designing and engineering this blast took the skilled expertise and collaboration of the mine's drill-and-blast team, DynoConsult, the Dyno Nobel Asia Pacific (DNAP) Electronics Conversion Team and DNAP Operations.
The common methods of texturing chassis dyno drums are thermal sprays and knurling.
Dean Parry, of Dyno Plumbing and Drains Franchise SJ Environmental Services Ltd South Wales, has some tips on ways to protect your home during the wetter weather.
Dyno is also one of the largest producers and marketers of holiday decorative home products in North America, Bunker Hill said.
When deployed recently with Telegenic's T18 stereoscopic 3D truck, the Grass Valley K2 Summit production client was used to feed mixer animation clips, primarily for 3D graphics sequences, into and out of replays using the K2 Dyno replay controller.
The dyno facility includes multiple custom rooftop climate control units that feed the first floor and basement level by means of reyno-bond duct enclosures, a test laboratory, dyno test cell, clean room, electric control room and pre-soak area.
DYNO the pup was still a bit ruff yesterday after being flushed down the loo.
After a night at the local vets, Dyno, named after its rescuers, was given a clean bill of health.