This part of ISO 7626 specifies procedures for measuring linear mechanical mobility and other frequency-response functions of structures, such as buildings, machines and vehicles, using a single-point translational vibration exciter attached to the structure under test for the duration of the measurement.<\/p>\n
It is applicable to measurements of mobility, accelerance, or dynamic compliance, either as a driving-point measurement or as a transfer measurement. It also applies to the determination of the arithmetic reciprocals of those ratios, such as free effective mass. Although excitation is applied at a single point, there is no limit on the number of points at which simultaneous measurements of the motion response may be made. Multiple-response measurements are required, for example, for modal analyses.<\/p>\n
| PDF Pages<\/th>\n | PDF Title<\/th>\n<\/tr>\n | ||||||
|---|---|---|---|---|---|---|---|
| 7<\/td>\n | Foreword <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | Introduction <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | 1\tScope 2\tNormative references 3\tTerms and definitions <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | 4\tOverall configuration of the measurement system <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 5\tSupport of the structure under test 5.1\tGeneral 5.2\tGrounded measurements 5.3\tUngrounded measurements <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | 6\tExcitation 6.1\tGeneral 6.2\tExcitation waveforms 6.2.1\tGeneral 6.2.2\tDiscretely dwelled sinusoidal excitation <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | 6.2.3\tSlowly swept sinusoidal excitation 6.2.4\tStationary random excitation 6.2.5\tOther excitation waveforms 6.3\tVibration exciters <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | 6.4\tAvoidance of spurious forces and moments 6.4.1\tGeneral 6.4.2\tTransducer mass loading 6.4.3\tTransducer rotational inertia loading 6.4.4\tExciter attachment restraints <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | 7\tMeasurement of the exciting force and resulting motion response 7.1\tGeneral 7.2\tAttachment of transducers <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | 7.3\tMass loading and mass cancellation 7.4\tSignal amplifiers <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | 7.5\tCalibrations 7.5.1\tGeneral 7.5.2\tOperational calibration <\/td>\n<\/tr>\n | ||||||
| 24<\/td>\n | 8\tProcessing of the transducer signals 8.1\tDetermination of the frequency-response function 8.1.1\tGeneral 8.1.2\tSinusoidal excitation 8.1.3\tRandom excitation 8.2\tFiltering 8.2.1\tSinusoidal excitation 8.2.2\tRandom excitation <\/td>\n<\/tr>\n | ||||||
| 25<\/td>\n | 8.3\tAvoidance of saturation 8.4\tFrequency resolution 8.4.1\tGeneral 8.4.2\tSinusoidal excitation 8.4.3\tRandom excitation 8.4.4\tPeriodic excitation <\/td>\n<\/tr>\n | ||||||
| 26<\/td>\n | 9\tControl of the excitation 9.1\tGeneral 9.2\tTime required for sinusoidal excitation 9.2.1\tGeneral 9.2.2\tDiscretely dwelled sinusoidal excitation <\/td>\n<\/tr>\n | ||||||
| 27<\/td>\n | 9.2.3\tSlowly swept sinusoidal excitation 9.3\tTime required for random excitation <\/td>\n<\/tr>\n | ||||||
| 28<\/td>\n | 9.4\tDynamic range 9.4.1\tGeneral 9.4.2\tSinusoidal excitation 9.4.3\tRandom excitation 10\tTests for valid data <\/td>\n<\/tr>\n | ||||||
| 29<\/td>\n | 11\tModal parameter identification <\/td>\n<\/tr>\n | ||||||
| 30<\/td>\n | Annex\u00a0A (normative) Tests for validity of measurement results <\/td>\n<\/tr>\n | ||||||
| 33<\/td>\n | Annex\u00a0B (normative) Requirements for excitation frequency increments and duration <\/td>\n<\/tr>\n | ||||||
| 35<\/td>\n | Annex\u00a0C (informative) Modal parameter identification <\/td>\n<\/tr>\n | ||||||
| 36<\/td>\n | Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Mechanical vibration and shock. Experimental determination of mechanical mobility – Measurements using single-point translation excitation with an attached vibration exciter<\/b><\/p>\n |