초록 ▼

Processes and apparatus for signal analysis enable "pass/fail" determinations to be made with respect to noisiness of a mechanical or electrical system under test, particularly the presence of bumps and nicks in gear train systems under test. In a process aspect, for a gear system, a torque input is

Processes and apparatus for signal analysis enable "pass/fail" determinations to be made with respect to noisiness of a mechanical or electrical system under test, particularly the presence of bumps and nicks in gear train systems under test. In a process aspect, for a gear system, a torque input is applied. A first signal responsive to the torque applied to the gear system under test is produced, which is converted to digital data responsive to a first correlation between the first signal and time. Peaks in the digital data are measured to determine whether they exceed a predetermined threshold magnitude. The peaks that exceed the predetermined threshold magnitude are subjected to harmonic analysis, the results being compared to gear tooth harmonics to determine whether the peaks constitute an anomaly. Such an anomaly is a bump or a nick on a tooth of the gear system under test. Improved anomaly detection is achieved by producing a second signal responsive to a noise produced by the gear system under test, converting same to digital data responsive to a second correlation between the second signal and time, and identifying peaks in the second digital data that are simultaneous with peaks in the torque digital data. The simultaneous peaks in the second digital data are measured to determine whether they exceed a second predetermined threshold magnitude, and those that do are subjected to harmonic analysis. A load is applied to the gear system under test, the load being controllable in response to the torque or noise signals.

대표청구항 ▼

[ What is claimed is:] [1.] A method of signal analysis for processing information from a gear system under test, the method comprising the steps of:driving the gear system under test by application of a rotatory input;producing a first signal responsive to the rotation of the gear system under test

[ What is claimed is:] [1.] A method of signal analysis for processing information from a gear system under test, the method comprising the steps of:driving the gear system under test by application of a rotatory input;producing a first signal responsive to the rotation of the gear system under test;producing a second signal responsive to a noise produced by the gear system under test in response to said step of driving;producing digital data responsive to a correlation between the first and second signals;converting the digital data into corresponding frequency components;subjecting the frequency components to analysis to determine a power spectrum density of the frequency components; andsubjecting the power spectrum density to harmonic analysis.