Progress in dynamic force measurement

DR series force transducers with two integrated acceleration sensors

DR series force transducers with two integrated acceleration sensors

Transfer behavior Type I sensor

Transfer behavior Type I sensor

Transfer behavior Type II sensor

Transfer behavior Type II sensor

GTM has expanded its range of products to include another force measurement series for dynamic applications. The DR series is equipped with acceleration sensors to compensate for undesired inertia forces, as standard equipment.

The problem in every dynamic application, due to design reasons, is that the component or specimen to be tested cannot be connected directly and without additional mass to the force transducer. As a result of the inertia force of the additional mass, the applied dynamics always result in a measuring error, because the measured force does not correspond to the force on the component or specimen. Only in rare cases the error can be tolerated and therefore must normally be compensated by measuring the acceleration.

Another challenge is that in many tests the dynamic parameters cannot be randomly varied. Existing mechanical adaptations define the masses in the test setup; existing controllers, measuring technology and drive power define the frequency range and the achievable accelerations.

This is where the DR series shows a definite advantage: every force transducer features two different acceleration sensors for compensation, as standard equipment. One acceleration sensor (Type I) with a rated acceleration of 37 g for use at low frequencies and a second one (Type II) with acceleration of 70 g for higher frequencies into the kHz range.

The measurement of the acceleration takes place directly at the related moving mass of the force transducer. This design creates optimal conditions for compensation of the inertia forces that occur. The use of two different acceleration sensors gives the user full flexibility, as well as compatibility for future testing tasks.