Testing Equipment Of Guide Rail
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For example, if you need the bearing's load, the power loss is 4%; the operating life exceeds 1000 hours; to complete these requirements; the percentage of life given on the table is 53% of the normal L bearing life. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
Divide the required lifespan by the percentage of corrections; this gives L:
1000/0.53=1887(h)
This result indicates that the 1000-hour life expectancy is required to obtain 96% reliability; it is valuable to introduce the dynamic bearing capacity equation to calculate the bearing scale for the bearing life of 90% reliability.
The calculation of loads and equivalent loads is used to determine the additional load of the bearing that meets the requirements; it is necessary to consider all the forces that the equipment is to accept; and the corresponding moments of each force effect on the bearing during its given period.
The various conditions or working conditions that the bearing satisfies can be tabulated. Pay attention to; where the bearing load unit is N; the speed unit is r/min; the useful time of each condition is expressed in the life of the bearing reservation. These can be simplified to the equivalent load P; then; each condition uses the appropriate equation to determine the equivalent load.
If the speed and load are constant during the entire operating cycle; the equivalent load is the accounting load:
P = P equation (A)
If it is in a long period; the speed is constant; the load changes from the minimum value P to the maximum value P; then:
If it is within a given finite period; the velocity is constant; the load change is nonlinear (either a step function or a power function; a sine function; or a combination of certain functions); at the end of the life; this nonlinear change randomly Repeat; then:
In the meantime, P; P;, ,;; P represents the effect load at the selected time t; t;, ​​,,; t; attention; P; P;,,;; one or some of the P values It is necessary to formula (A) or (B).
If both the load and the speed change; and each load change is accompanied by a corresponding speed change; then:
In the meantime, P;P;,,;;P indicates the effect load when the speed is n, n, , and n; q; q;,, and q indicate P effect on n; P effect on n;, ,; The percentage of time at n. This way; because the various speeds are now included in the equation; therefore the lifespan should be accounted for using the modified lifespan formula:
The coefficient "500" in equation (E) is the time value of 500 hours; it is based on the international standard speed of 33 / min; equivalent to the bearing life of 500 hours.
Correcting the equivalent load is subject to oscillation in many applications; the bearing stress is significantly improved. The same; many occasions including initial and permanent different axial degrees; all require significant improvement in load.
The compensation of the oscillating load is based on the corresponding oscillating force (thinking the worst case or maximum oscillating load) and is compared with the normal and stable radial load. The correction coefficient K is necessary as the coefficient in the equivalent load equation. Table 1 6 lists the coefficients under two conditions: one is K; the oscillation force P is based; P is greater than the stability load P, and the other is K; P is the basis; P is the day P.
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Source: China Bearing Network Time: 2013-06-21