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US 4,358,959 AGranted
Method and device for measuring the parameters of a damped, spring-supported mass
AssigneeFokker-VFW B.V.
InventorsWilhelmus J. Lam, Luitzen De Vries
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AssigneeFokker-VFW B.V.
InventorsWilhelmus J. Lam, Luitzen De Vries
Estimating the term…
A method of measuring the rigidity, the damping coefficient and the inertia of a system consisting of a damped, spring-supported mass, particularly, the manually operable member of the control-system of an aircraft or a flight simulator, in which method the measurement of the rigidity takes place by determining the relationship between the force exerted on the mass and the deviation of the mass from the state of equilibrium at a speed and an acceleration of substantially zero value and storing the relationship. The method is characterized by the initial step of forming three electric signals--namely, a force signal having a value directly proportional to the force exerted on the mass, an acceleration signal having a value directly proportional to the acceleration of the mass, and a velocity signal having a value directly proportional to the speed of the mass. Thereafter, the mass is moved in a manner such that it attains an acceleration and a velocity having values differing from substantially zero and the amplitude of the acceleration signal and of the velocity signal is adjusted such that by subtracting these two signals from the force signal substantially the same relationship to the deflection is obtained as in measuring the rigidity. A device for carrying out the method is also provided.
In a method of measuring the rigidity, the damping coefficient and the inertia of a system comprising a damped, spring-supported mass of the type wherein the measurement of the rigidity takes place by determining the relationship between the force exerted on the mass and the deviation of the mass from the state of equilibrium at a speed and an acceleration of substantially zero value and storing said relationship, the improvement comprising the steps of:
In a device for measuring the rigidity, the damping coefficient and the inertia of a system including a damped, spring-supported mass of the type wherein the measurement of the rigidity takes place by determining the relationship between the force exerted on the mass and the deviation of the mass from the state of equilibrium at a speed and an acceleratiion of substantially zero value, wherein said relationship is stored, wherein three electric signals are formed--namely, a force signal having a value directly proportional to the force exerted on the mass, an acceleration signal having a value directly proportional to the acceleration of the mass, and a velocity signal having a value directly proportional to the speed of the mass, wherein the mass is moved in a manner such that it attains an acceleration and a velocity having values differing from substantially zero, and wherein the amplitudes of the acceleration signal and the velocity signal are adjusted such that by subtracting these two signals from the force signal substantially the same relationship to the deflection is obtained as in measuring the rigidity, the combination comprising:
Dependencies are inferred from the claim text.