Gear Stage Cyclic Durability

The ability of the pump to accept the cyclic duty imposed by modern engines without distress has been an accurate predictor of the pump's capability of meeting its service life requirement. The test is based upon the real-time pressure, temperature, and speed transients for engine operating conditions such as starting, ground idle, takeoff and climb, cruise, descent, and thrust reverse.

PREDICTED GEAR STAGE PERFORMANCE (1.530 CU IN DISP)

PREDICTED GEAR STAGE PERFORMANCE (1.530 CU IN DISP)

0.00 10.00 20.00 30.00 40.00 50.00

Input Horsepower

FIGURE 18 Gear stage performance (m3/h = 0.227 X gpm; kW = 0.7457 X hp; bar = 0.06895 X psi; liter = 0.0164 X in3; °C = (°F - 32) X 0.556)

The worst cases for the sequencing of the transients are selected to achieve the highest levels of stress in the gear and bearing system. The real transient times are halved and the steady state operating times minimized to accelerate the test. The number of test cycles and overall test time are based upon the expected service life of the pump.

Survival Treasure

Survival Treasure

This is a collection of 3 guides all about survival. Within this collection you find the following titles: Outdoor Survival Skills, Survival Basics and The Wilderness Survival Guide.

Get My Free Ebook


Post a comment