IS0 7626-2:2015 pdf download.Mechanical vibration and shock—Experimental determination of mechanical mobility — Part 2: Measurements using single-point translation excitation with an attached vibration exciter.
3.2
mobility
mechanical mobility
complex ratio of the velocity, taken at a point In a mechanical system. to the excitation force, taken at the same or other point in the system
Note 1 to entry: Mobility is the ratio of the complex velocity-response at point ito the complex excitation force at point) with all other measurement points on the structure allowed to respond freely without any constraints other than those constraints which represent the normal support of the structure in its intended application.
Note 2 to entry: The term point. as used here, designates both a location and a direction. The terms coordinate’ and degree•oi•freedom have also been used with the same meaning as point.
Note 3 to entry: The velocity response can be either translational or rotational, and the excitation force can be either a rectihnear force or a moment.
Note 4 to entry: lithe velocity response measured is a translational one and if the eXcitation force applied Is a rectilinear one, the units of the mobility term are m/(N . a) in the SI system.
Note S to entry: Mechanical mobility is an element of the inverse ot mechanical impedance matrix.
[SOIJRCE: Iso 2041:2009, 1.54, modified]
3.3
driving-point mobility
frequency-response function formed by the complex velocity-response at pointjtothe complex excitation force applied at the same point with all other measurement points on the structure allowed to respond freely without any constraint other than those constraints which represent the normal support of the structure In its intended application
[SOURCE: ISO 2041:2009, Note to 1.55, modified]
3.4
transfer mobility
V,j
frequency-response function formed bythe complex velocity-response at point itothe complex excitation force applied at pointj with all points on the structure, other than j. allowed to respond freely without any constraint other than those constraints which represent the normal support of the structure In its Intended application
[SOURCE: ISO 2041:2009, 1.56. modificd]
3.5
frequency range of Interest
span between the lowest frequency to the highest frequency at which mobility data are to be obtained in a given test series.
mobility
mechanical mobility
complex ratio of the velocity, taken at a point In a mechanical system. to the excitation force, taken at the same or other point in the system
Note 1 to entry: Mobility is the ratio of the complex velocity-response at point ito the complex excitation force at point) with all other measurement points on the structure allowed to respond freely without any constraints other than those constraints which represent the normal support of the structure in its intended application.
Note 2 to entry: The term point. as used here, designates both a location and a direction. The terms coordinate’ and degree•oi•freedom have also been used with the same meaning as point.
Note 3 to entry: The velocity response can be either translational or rotational, and the excitation force can be either a rectihnear force or a moment.
Note 4 to entry: lithe velocity response measured is a translational one and if the eXcitation force applied Is a rectilinear one, the units of the mobility term are m/(N . a) in the SI system.
Note S to entry: Mechanical mobility is an element of the inverse ot mechanical impedance matrix.
[SOIJRCE: Iso 2041:2009, 1.54, modified]
3.3
driving-point mobility
frequency-response function formed by the complex velocity-response at pointjtothe complex excitation force applied at the same point with all other measurement points on the structure allowed to respond freely without any constraint other than those constraints which represent the normal support of the structure In its intended application
[SOURCE: ISO 2041:2009, Note to 1.55, modified]
3.4
transfer mobility
V,j
frequency-response function formed bythe complex velocity-response at point itothe complex excitation force applied at pointj with all points on the structure, other than j. allowed to respond freely without any constraint other than those constraints which represent the normal support of the structure In its Intended application
[SOURCE: ISO 2041:2009, 1.56. modificd]
3.5
frequency range of Interest
span between the lowest frequency to the highest frequency at which mobility data are to be obtained in a given test series.
