The following words and terms, when used in this chapter, shall have the following meanings, unless the context clearly indicates otherwise.
The maximum displacement of the earth from the normal rest position. Amplitude is usually reported as inches or mils.
The American National Standard Institute Guide to the Evaluation of Human Exposure to Vibration in Buildings.
All uses of property other than a residential use shall be considered a commercial/industrial source, including quasi-commercial uses.
Property used for human habitation. "Residential property" shall not include properties where the only human habitation is comprised or supervisors, janitors, maintenance personnel, groundkeepers or guards who are residing on a premises for the convenience of the property owner or as a condition of employment.
A ground-transmitted vibration stemming from a source where specific pulses do not exceed 60 per minute (or one per second).
The number of times that a displacement completely repeats itself in one second of time. Frequency may be designated in cycles per second (cps) or hertz (Hz).
Vibration of a duration or intensity such that it causes secondary or sympathetic vibrations on an adjoining property. Evidence of such gross vibration shall include the audible or visible results of objects in motion, such as the travel of objects, movement of wall hangings or waves in standing water and/or the clanging of dishes, glasses, bottles or utensils or windows vibrating in their frames.
An earthborne vibration generally produced by two or more objects striking each other so as to cause separate and distinct pulses.
Any distinct parcel of land used for commercial/industrial or quasi-commercial on one part and residential on another part. The commercial/industrial or quasi-commercial use shall act as a source, and the residential use shall act as a receptor.
A characteristic of vibration that depends on both displacement and frequency. If not directly measured, it can be computed by multiplying the frequency by the amplitude times the factor 6.28. The particle velocity will be in inches per second when the frequency is expressed in cycles per second and the amplitude in inches.
Especially on commercial/residential properties, boilers, utility provisions, water-pressure pumps, incinerators, elevators, laundry rooms, garage door closers, health and recreation facilities and other similar activities.
The residential building exterior either at the ground or at any residential floor or, if so designed, the exterior line of any balcony or terrace. For intrabuilding use, it shall be the interior of the room affected by the commercial or quasi-commercial activity. Rooms shall not include halls or closets.
The setting in motion of common objects on the receptor property by the original source vibration. Such items include, but are not limited to, dishes, glasses, utensils, window frames, wall hangings, television antennas and standing water.
The level that differentiates the presence of the vibration phenomenon from the background level. The background level is assumed to be no vibration unless a three-hundred-sixty-degree inspection of the receptor premises and the source premises indicates otherwise.
A vibration which is continuous, as from a fan, compressor or motor.
A reciprocating movement transmitted through the earth, both in horizontal and vertical planes.
The minimum ground- or structure-borne vibration motion necessary to cause a person to be aware of the vibration by such direct means as, but not limited to, sensation by touch or visual observation of moving objects.
