Table 1 Initial numerical data and the main results of calculating the stability of suspension arrangements with a normal, narrow and wide position of the primary pivots

From: Effect of the distance between primary pivots on the stability of two-chain cargo suspension arrangement

Value Term and unit of value Type of suspension arrangement
Normal Narrow Wide
1 Weight of load Pc, kN 1600 1600 1600
2 Wright of spreader p, kN 300 300 300
3 Half of length of spreader (distance between secondary slings or points A and B ) l, m 4 4 4
4 Height of the primary suspension v, m 4.44 4.44 4.44
5 Normal primary suspension angle \(\varphi , {\text{deg}}\) 42 42 42
6 Narrow primary suspension angle \(\varphi^{nr} , {\text{deg}}\) 18
7 Wide primary suspension angle \(\varphi^{w} , {\text{deg}}\) 64
8 Maximum tilting angle at which the arrangement is still stable \(\propto_{m} , \propto_{m}^{nr} , \propto_{m}^{w} ,{\text{ deg}}\) 37.2 18 37.2
9 Length of the ST base \(2y, 2y_{m}^{nr} , 2y_{m}^{w} , {\text{m}}\) 8 3.43 8
10 Height of the ST \(z_{m} , z_{m}^{nr} , z_{m}^{w} , {\text{m}}\) 5.27 5.27 5.27
11 Minimal narrow primary suspension angle (at which the stability of the arrangement is the same as for the normal one) \(\varphi_{min}^{nr} , {\text{deg}}\) 37.2
12 The minimal distance between primary slings (at which the stability of the arrangement will be the same as for the normal \(2l_{min}^{nr}\), m 6.74