초록 ▼

The invention relates to an unbalance dynamic load generator comprising at least one pair of eccentric rotating masses (M) which are symmetric with respect to a plane and whose motion is controlled by at least one control signal generated by a control module as a function of a preset signal (Fd(t))

The invention relates to an unbalance dynamic load generator comprising at least one pair of eccentric rotating masses (M) which are symmetric with respect to a plane and whose motion is controlled by at least one control signal generated by a control module as a function of a preset signal (Fd(t)) having a given frequency. It is characterized in that, for at least one of the masses, it comprises a reference angular position sensor (C) delivering a position signal (SP) representing the passing of the said rotating mass (M) through a reference angular position and a control circuit comprising a calculation circuit (DSP) for calculating the periodicity of the rotation of the said mass from the successive position signals delivered by the position sensor (C) and for generating the said control signal (CS) as a function of the difference between the measured periodicity and the periodicity of the preset signal.

대표청구항 ▼

The invention claimed is: 1. An unbalance dynamic load generator comprising at least one pair of eccentric rotating masses which are symmetric with respect to a plane and whose motion is controlled by at least one control signal generated by a control module as a function of a preset signal (Fc(t))

The invention claimed is: 1. An unbalance dynamic load generator comprising at least one pair of eccentric rotating masses which are symmetric with respect to a plane and whose motion is controlled by at least one control signal generated by a control module as a function of a preset signal (Fc(t)) having a given frequency, including, for at least one of the masses, a reference angular position sensor (C) delivering a match signal (SP) representing the passing of the said rotating mass (M) through a reference angular position and a control circuit comprising a calculation circuit (DSP) for calculating the periodicity of the rotation of said mass from the successive position signals delivered by the position sensor (C) and for generating said control signal (CS) as a function of the difference between the calculated periodicity and the periodicity of the preset signal, and a phase measurement circuit for measuring a time gap between the signal delivered by the position sensor (C) and a reference point of the preset signal Fc(t) and wherein said calculation circuit (DSP) comprises a corrector module for generating said control signal also as a function of the difference between said measured time gap and a preset time gap. 2. An unbalance dynamic load generator comprising at least one pair of eccentric rotating masses which are symmetric with respect to a plane and whose motion is controlled by at least one control signal generated by a control module as a function of a preset signal (Fc(t)) having a given frequency, including, for at least one of the masses, a reference angular position sensor (C) delivering a match signal (SP) representing the passing of the said rotating mass (M) through a reference angular position and a control circuit comprising a calculation circuit (DSP) for calculating the periodicity of the rotation of said mass from the successive position signals delivered by the position sensor (C) and for generating said control signal (CS) as a function of the difference between the calculated periodicity and the periodicity of the preset signal, and including a time indicator whose value is incremented by a clock and a memory for storing the value of the time indicator when the reference angular position sensor delivers said position signal (SP) and when the preset signal Fc(t) passes through a characteristic point. 3. A generator according to claim 2, wherein the calculation circuit comprises an element for calculating from the stored values of the time indicator the first time period which separates two successive position signals (SP) and the second time period which separates the passing of the preset signal Fc(t) through two successive characteristic points and wherein the calculation circuit (DSP) comprises an element for calculating the difference between said first and second time periods. 4. A generator according to claim 3, characterized in that the said difference between the said first and second time periods is formed with respect to the second time period. 5. A generator according to claim 4, wherein said measured time gap is formed with respect to the second time period. 6. A generator according to claim 3, wherein the calculation circuit (DSP) comprises an element for calculating from the stored values of the time indicator said time gap which is measured between the instant at which the reference angular position sensor delivers the position signal and the instant at which the preset signal passes through said characteristic point. 7. A generator according to claim 3, wherein the time indicator is a counter which is reinitialized periodically, for example by resetting to zero each time it reaches its maximum count. 8. A generator according to claim 2, wherein the calculation circuit (DSP) comprises an element for calculating from the stored values of the time indicator said time gap which is measured between the instant at which the reference angular position sensor delivers the position signal and the instant at which the preset signal passes through said characteristic point. 9. A generator according to claim 2, wherein at least one module exhibits at least one auxiliary angular position sensor which is angularly offset with respect to the reference sensor. 10. A generator according to claim 9, wherein the calculation circuit comprises an element for calculating from the stored values of the time indicator the first time period which separates two successive position signals and the second time period which separates the passing of the preset signal through two successive characteristic points and in that it comprises an element for calculating the difference between the first and the second time period referred to one and the same angular gap. 11. A generator according to claim 10, wherein the calculation circuit (DSP) comprises an element for calculating from the stored values of the time indicator said time gap which is measured from the difference between the instant at which an angular position sensor delivers the position sensor or signal and the instant at which the preset signal passes through said characteristic point, by taking account in respect of the auxiliary angular position sensor or sensors of their angular offset with respect to the reference angular position sensor (C). 12. A generator according to claim 2, wherein the time indicator is a counter which is reinitialized periodically, for example by resetting to zero each time it reaches its maximum count. 13. A generator according to claim 12, comprising a logic element for adding to the stored value of the time indicator a value equal to the reinitialization of the count of the counter in respect of the first position signal after each so-called reinitialization and in respect of the first passing through the said characteristic point of the preset signal after each so-called reinitialization. 14. A generator according to claim 2, having two pairs of rotating masses, and wherein the preset signal exhibits an amplitude representing the modulus of a sinusoidal force to be produced by the conjugate action of two pairs of rotating masses by adjusting a phase 100 , one of the pairs of rotating masses exhibiting a lead in phase 100 with respect to the preset signal and the other pair of rotating masses a lag in phase φ, with respect to the preset signal, the calculation circuit generating on the one hand a first control signal (P1 speed) for adjusting the frequency of rotation of the rotating masses and on the other hand a second control signal for adjusting the said phase φ. 15. An unbalance dynamic load generator comprising two pairs of eccentric rotating masses which are symmetric with respect to a plane and whose motion is controlled by at least pg,20 one control signal generated by a control module as a function of a preset signal (Fc(t)) having a given frequency, including, for at least one of the masses, a reference angular position point sensor (C) delivering a match signal (SP) representing the instant at which the said rotating mass (M) passes through a reference angular position and a control circuit comprising a calculation circuit (DSP) for calculating the periodicity of the rotation of said mass from the successive position signals delivered by the position sensor (C) and for generating said control signal (CS) as a function of the difference between the calculated periodicity and the periodicity of the preset signal, and wherein the preset signal Fc(t) exhibits an amplitude representing the modulus of a sinusoidal force to be produced by the conjugate action of two pairs of rotating masses by adjusting a phase φ, one of the pairs of rotating masses exhibiting a lead in phase φ with respect to the preset signal and the other pair of rotating masses a lag in phase (0, with respect to the preset signal Fc(t), the calculation circuit generating on the one hand a first control signal (P1 speed) for adjusting the frequency of rotation of the rotating masses and on the other hand a second control signal for adjusting the said phase φ. 16. An unbalance dynamic load generator comprising two pairs of eccentric rotating masses which are symmetric with respect to a plane and whose motion is controlled by at least one control signal generated by a control module as a function of a preset signal (Fc(t)) having a pg, 21 given freciuency, including, for at least one of the masses, a reference angular position point sensor (C) delivering a match signal (SP) representing the instant at which the said rotating mass (M) passes through a reference angular position and a control circuit comprising a calculation circuit (DSP) for calculating the periodicity of the rotation of said mass from the successive position signals delivered by the position sensor (C) and for generating said control signal (CS) as a function of the difference between the calculated periodicity and the periodicity of the preset signal, wherein the masses (M) of said pair are mechanically coupled together and the generator has a single so-called reference angular position sensor (C) associated with one of the two masses (M) of said pair, and wherein the preset signal exhibits an amplitude representing the modulus of a sinusoidal force to be produced by the conjugate action of two pairs of rotating masses by adjusting a phase φ, one of the pairs of rotating masses exhibiting a lead in phase φwith respect to the preset signal and the other pair of rotating masses a lag in phase φ, with respect to the preset signal, the calculation circuit generating on the one hand a first control signal (P1 speed) for adjusting the frequency of rotation of the rotating masses and on the other hand a second control signal for adjusting the said phase φ. 17. An unbalance dynamic load generator comprising two pairs of eccentric rotating masses which are symmetric with respect to a plane and whose motion is controlled by at least one control signal generated by a control module as a function of a preset signal (Fc(t)) having a given frequency, including, for at least one of the masses, a reference angular position point sensor (C) delivering a match signal (SP) representing the instant at which the said rotating mass (M) passes through a reference angular position and a control circuit comprising a calculation circuit (DSP) for calculating the periodicity of the rotation of said mass from the successive position signals delivered by the position sensor (C) and for generating said control signal (CS) as a function of the difference between the calculated periodicity and the periodicity of the preset signal, wherein the masses of said pair are mechanically independent and the generator has a reference angular position sensor (C) for each of the two masses (M) of said pair, and wherein the preset signal exhibits an amplitude representing the modulus of a sinusoidal force to be pg,22 produced by the conjugate action of two pairs of rotating masses by adjusting a phase φ one of the pairs of rotating masses exhibiting a lead in phase p with respect to the preset signal and the other pair of rotating masses a lag in phase φ with respect to the preset signal, the calculation circuit generating on the one hand a first control signal (P1 speed) for adjusting the frequency of rotation of the rotating masses and on the other hand a second control signal for adjusting the said phase φ.