458 BELL SYSTEM TECHNICAL JOURNAL 



B A parameter of cushioning with cubic elasticity defined in equation 



(1.5.3). Also, a constant of integration. 



Bn Coefficient in the w*'' term of a series. 



6 /// in the tension spring package. 



C A constant of integration. 



Cn Coefficient of the n^^ term of a series. 



c A constant defined in equation (1.7.11) 



C\ Damping coefficient of an element of a packaged article. 



C2 Damping coefficient of linear cushioning. 



cn The elliptic cosine function. 



do Hj^Dothetical displacement that would result if initial spring rate wer^ 



maintained. 



dh Maximum possible displacement of packaged article in cushioning with 



tangent elasticity. 



dm Maximum displacement of packaged article. 



d'm Value of dm when ^o = ^o- 



dt Displacement of bi-linear cushioning at which the spring rate changes 



from ^0 to ^6. 



E Modulus of elasticity. 



e In the tension spring package the stretch of a spring when the displace- 



ment is dm- 



exp ( ) e ' \ where e is the Naperian base 2.718- • • 



F In section 2.7, a frictional force. 



Fm In the tension spring package, the maximum force on a spring. 



/ In the tension spring package, the difference between / and the distance 



between hooks of an unstretched spring. 



/i Frequency of vibration of an element of the packaged article. 



fz Frequency of vibration of the packaged article on its cushioning. 



Go Hypothetical maximum acceleration (in number of times g) that would 



result if initial spring rate were maintained. 



Ge AmGm OX AaGo, l.c. the slowly applied acceleration (in number of times g) 



that will produce the same maximum response as a transient acceleration 

 of maximum value Gm or Go. 



Gf Maximum acceleration (in number of times g) in cushioning with fric- 



tion and spring rate kp. 



Gm Absolute value of maximum acceleration of packaged article in units of 



"number of times gravitational acceleration." 



Gm' Value of Gm when ^o = K. 



