ANSI E1.26-2006 pdf download American National Standard E1.26 – 2006 Entertainment Technology Recommended Testing Methods and Values for Shock Absorption of Floors Used in Live Performance Venues
4.5 A minimum of 5 points (as defined in Appendix A) shall be tested, the values recorded, and an average value computed. The high, low, and average values shall be reported. Additional points may be tested and used to compute the average value.
4.6 Shock Absorption Test Shock absorption is determined by analyzing two measurements taken using the apparatus shown in Figure 1. These two measurements are taken at each designated test point. Each point shall be tested a minimum of five times without moving the apparatus. The recorded values shall be averaged and the average value shall be used as the value for that test point.
4.6.1 Test equipment The test apparatus shown in Figure 1 consists of a drop weight (3), which is held in place using an electromagnetic release mechanism (2). The weight is guided by two side posts (1) and shall have a transfer bolt (9) affixed to the bottom surface. The weight (3) shall drop onto a sub assembly consisting of a baffle (4), spring (5), force detector (7) and test foot (8) contained within a sleeve (6). This serves to transfer the force generated by the drop weight onto the subject test piece, as absorbed by the spring and detected by the force detector.
4.6.1.1 Technical requirements
The test apparatus shall have the fllowin technical characteristics:
a. The drop weight (3) with transfer bolt (9) shall have a total mass of 20+0.1 kg. The. transfer bolt (9) shall be of hardened steel, a minimum of 50 mm in diameter, have a length of 75 mm and have a smooth ground underside.
b. The bafle (4) shall act as an upper spring cover and shall be of hardened steel with a convex upper surface, radius 100 mm.
c. The spring (5) shall have a graphically verified elastic constant, C = 2000+60 N/mm, at any force in the range of 0 kN to 10 kN.
d. The test foot (8) shall be of hardened steel with a convex underside, radius 500 mm; 10 mm thick, edge radius 1 mm, and 70 mm diameter.
e. The sleeve (6) shall be metal with a diameter of 70 mm to match the test foot and contain the spring.
f. The total weight of the test foot (8), sleeve (6), spring (5), bafle (4), and force detector (7) shall not exceed 3 kg.
g. The axis of the stand feet supporing the apparatus shall be a minimum of 600 mm from the axis of the drop weight.
h. The trgger mechanism shall provide an adjustable drop height from 40 mm to 120 mm.
4.6.1.2 Measuring instrument
The measuring instrument shall consist of a force detector with an amplifer and recording unit.Force detectors that shall be allowed include strain gauge force transducers, and piezoelectric stress rings. These devices shall be accurate with 1% over a measurement range of OkN to 10 kN.

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