DYNAMICS OF PACKAGE CUSHIONING 459 



Gn In section 1.15, the maximum acceleration (in number of times g) ex- 



perienced by the suspended mass when dropped from a height hn- In 

 Part IV, the maximum acceleration (in number of times g) of the n**" 

 mode of vibration. 



Gr Maximum acceleration (in number of times g) after rebound. 



Gt Safe value of Ge. 



g Gravitational acceleration. 



h Height of drop. 



hn In Section 1.15, the height of fall that will cause the cushioning to dis- 



place an amount (3:2) n. 



K In the tension spring package, the initial spring rate of the suspension. 



In Section 2.8, the complete elliptic integral of the first kind. 



Ki, K2, A'3 The initial spring rates in the three mutually perpendicular directions 

 normal to the faces of the package frame. 



k In the tension spring package, the spring rate of a spring. In Section 



2.8, the modulus of an elliptic integral. 



k, k' In Section 4.3, 0, 1, 2, 3, • • • . 



^0 Initial spring rate of non-linear cushioning. 



k'a Optimum value of initial spring rate ka. 



ki Spring rate of lumped elasticity of element of packaged article. 



jfej Spring rate of linear cushioning. 



kb Spring rate of bilinear cushioning after bottoming. 



kp Spring rate defined in equation (2.7.7). 



L Constant defined in equation (1.8.2). 



/ In the tension spring, the projection of h on a horizontal plane. In 



Section 4.2, length of cushioning. In Section 4.3, length of element of 

 packaged article. 



li In the tension spring package, the distance between the two support 



points of a spring when the suspended article is in the equihbrium 

 position. 



M Constant defined in equation (1.8.4), equal to Gm/Go. 



m Reduced mass defined in equation (2.4.5). 



m, m' In Section 4.3, 0, 1, 2, 3, • • • . 



m\ Lumped mass of element of packaged article. 



mi Lumped mass of packaged article. 



m-i Lumped mass of outer container. 



vfii Mass of cushioning. 



N M^. 



