JPWO2021011982A5 - - Google Patents

Claims (17)

A method (100) for detecting imbalance and/or misalignment of at least one propeller shaft (5, 5a, 5b) of a drive train (3) operating on a test bench (1), comprising: A first piezoelectric force sensor (4) measures the power between the dynamometers (14a, 14b) of the test stand (1) and the drive train (3) or the prime mover (2) of the test stand (1). caused by the transmission (101) and placed in the force flow transmitted by said propeller shaft (5; 5a, 5b), using a first force sensor (4a, 4b, 4c), said A first force in a first plane (E1) intersected by the axis of rotation (D) of the propeller shaft (5; 5a, 5b) and/or perpendicular to said first plane (E1) Measurements are taken (102-1), at least one measured value curve of said first force measurement and the value of the angle of rotation determination for said propeller shaft (5; 5a, 5b) assigned to said measured value curve. is analyzed (103a) to detect imbalance and/or the measured value course of said first force measurement detects misalignment of said propeller shaft (5; 5a, 5b) The method (100) is analyzed (103b) for 2. Method according to claim 1, wherein the measured value course of the first force measurement is analyzed to detect an imbalance with respect to the axis of rotation and/or the center of gravity of the propeller shaft (5; 5a, 5b). 100). Within said force flow, by means of a second piezoelectric force sensor (11), said propeller shaft (5; 5a, 5b) of said drive train as well, although different from said first plane (El) A second force measurement is performed (102-2) in a second plane (E2) intersected by said axis of rotation (D) of said propeller shaft (5; 5a, 5b) with respect to the center of gravity of said propeller shaft The method (100) according to claim 1 or 2, wherein the imbalance of is additionally determined based on the measured value course of the second force measurement. Claims 1-3, wherein said first piezoelectric force sensor (4) and/or second piezoelectric force sensor (11) is a multi-component force sensor comprising a plurality of piezoelectric elements (4a, 4b, 4c). A method (100) according to any one of Claims 1 to 3. 5. The method (100) according to claim 4, wherein force and torque components are determined using a system of equations based on measurement signals of each of said piezoelectric elements (4a, 4b, 4c). 6. Method (100) according to claim 4 or 5, wherein the measurement signal of each piezoelectric element (4a, 4b, 4c) is decomposed into components contributing to the respective force and/or torque component to be derived. between the dynamometer (14a, 14b) and the support device (10) and/or the prime mover (2) and the support device (10) in the first force measurement and/or the second force measurement A method (100) according to any one of the preceding claims, wherein a reaction force is measured for said force flow between Method (100) according to any one of the preceding claims, wherein the mass of the propeller shaft (5; 5a, 5b) is adjusted based on detection of imbalances and/or misalignments. A computer program containing instructions which, when executed by a computer, cause a computer to perform the steps of the method according to any one of claims 1 to 8. 10. A computer readable medium storing a computer program according to claim 9. a dynamometer (14a, 14b) connectable to the drive train (3) to be tested;
positioned in the force flow with respect to said drive train (3) to be tested and intersected by the axis of rotation (D) of the propeller shafts (5; 5a, 5b) of said drive train (3) ; with the test stand operating in a first plane (E1) that is at least substantially perpendicular to said axis of rotation (D) and/or perpendicular to said first plane (E) , a first piezoelectric force sensor (4) configured to perform a first force measurement;
a relative encoder (6) set to determine the angle of rotation about said propeller shaft (5; 5a, 5b);
A signal processor (7),
- said propeller shaft (5; means (8) for detecting imbalance of 5a, 5b); and/or
- a signal processor (7) comprising means (9) for detecting misalignment of the propeller shaft (5; 5a, 5b) on the basis of the measured value course of the first force measurement;
A drive train test stand (1) having a. likewise located in the force flow with respect to the drive train (3) to be tested and different from said first plane (E1) but also said propeller shaft (5; 5a, 5b) with a second piezoelectric force sensor (11) configured to perform a second force measurement in a second plane (E2) intersected by said axis of rotation (D) of 5a, 5b) and
4. The means (8) determine the imbalance of the propeller shaft with respect to the center of gravity of the propeller shaft (5; 5a, 5b) additionally based on the measured value course of the second force measurement. 12. A drive train test stand (1) according to claim 11. a support device (10) for supporting the dynamometer (14a, 14b) and/or prime mover (2), the first piezoelectric force sensor (4) and/or the second piezoelectric force sensor; is set up to measure reaction forces between said dynamometers (14a, 14b) and said support device (10) and/or between said prime mover (2) and said support device (10) 13. A drive train test stand (1) according to claim 11 or 12, wherein the drive train test stand (1) is arranged in a . of claims 11 to 13, wherein the first piezoelectric force sensor (4) and/or the second piezoelectric force sensor (11) do not change the rotating mass of the propeller shaft (5, 5a; 5b). A drive train test stand (1) according to any one of the preceding claims. Claims 11 to 14, wherein said first piezoelectric force sensor (4) and/or said second piezoelectric force sensor (11) is a multi-component force sensor comprising a plurality of piezoelectric elements (4a, 4b, 4c). A drive train test stand (1) according to any one of the preceding claims. Said piezoelectric elements (4a, 4b, 4c) are located between a first portion (5a) of said propeller shaft and a second portion (5b) of said propeller shaft. 16. Drive train test bench according to claim 15, arranged such that a force is measurable between said first part (5a) and said second part (5b) with (1). 17. Any one of claims 11 to 16, comprising means for adjusting the mass of the propeller shaft (5, 5a, 5b) based on detected imbalances and/or misalignments. drive train test stand (1).