Table 3 Explanation of symbols in Fig. 2.
From: Dynamical Behavior of Coal Shearer Traction-swing Coupling under Corrected Loads
Symbol | Explanation |
|---|---|
m1, m11 | The masses of the front and rear drums |
m2, m10 | The masses of the front and rear ranging arms |
m3, m7 | The masses of the front and rear haulage unit |
m4, m9 | The masses of the front and rear walking units |
m5, m8 | The masses of the front and rear supporting units |
m6 | The mass of the shearer body |
x3, x7 | The vibration displacements of the front and rear haulage unit in the traction direction |
x4, x9 | The vibration displacements of the front and rear walking units in the traction direction |
x5, x8 | The vibration displacements of the front and rear supporting units in the traction direction |
x6 | The vibration displacement of the shearer body in the traction direction |
λ | The pitch angle of the shearer |
ηz3, ηz7 | The vibration swings of the front and rear haulage unit in plane xoz |
β1, β11 | The vibration swings of the front and rear drums in plane xoy |
γ2, γ10 | The vibration swings of the front and rear ranging arms in plane xoy |
α1, α11 | the lift angles of the front and rear ranging arms for performing lifting operations |
Rx1, Ry1, Rx11, Ry11 | the cutting loads on the front and rear drums in the horizontal and vertical directions |
kx2, kx10 | the rigidities of the front and rear arms in plane xoy |
kqtx, cqtx, khtx, chtx | the equivalent rigidities and dampers of the front and rear lift cylinders |
kzx4, czx4, kzx9, czx9 | the equivalent rigidities and resistances of the coupling between the front/rear walking unit and front/rear haulage unit in the traction direction |
kqdx, cqdx, khdx, chdx | the rigidities and resistances of the contact between the front/rear driving wheel and front/rear pin rail in the traction direction |
kzx5, czx5, kzx8, czx8 | the equivalent rigidities and resistances of the coupling between the rear/front supporting unit and rear/front haulage unit in the traction direction |
kqpx, cqpx, khpx, chpx | the rigidities and resistances of the contact between the front/rear sliding shoes and the middle trough in the traction direction |
kcms, ccms, kcmx, ccmx | the equivalent rigidities and resistances of the upper and lower hydraulic rods on the coalface side |
kcks, ccks, kckx, cckx | the equivalent rigidities and resistances of the upper and lower hydraulic rods on the goaf side |
e | the radius of gyration of the gravity center of the ranging arm |
p | the distance between the gravity centers of the drum and ranging arm |
j | the width of the traction unit |
b | the distance between the hinging point of the lift cylinder and ranging arm and the ranging arm rotary pin |
