Standard No.:	GB/T 43324-2023
English Name:	Foil bearings—Performance of hydrodynamic gas thrust bearings—Testing of static load capacity, bearing torque , friction coefficient and lifetime
Chinese Name:	箔片轴承 气体动压止推轴承性能 静态承载能力、摩擦力矩、摩擦因数和寿命测试
Chinese Classification:	J12    Sliding bearing
Professional Classification:	GB    National Standard
ICS Classification:	21.100.10 21.100.10    Plain bearings 21.100.10
Issued by:	SAMR; SAC
Issued on:	2023-11-27
Implemented on:	2024-6-1
Status:	valid
Language:	English
File Format:	PDF
Word Count:	10500 words
Price(USD):	315.0
Delivery:	via email in 1~3 business day

GB/T 43324-2023 Foil bearings - Performance of hydrodynamic gas thrust bearings - Testing of static load capacity, bearing torque, friction coefficient and lifetime 1 Scope This document specifies the method for comparing performance evaluation results for a foil thrust bearing that supports load with aerodynamic force generated by the rotation of a driving shaft and lubricates using air, not lubricating oil. The test procedure explained in this document measures and evaluates the static load capacity, bearing torque, friction coefficient and lifetime of the foil thrust bearing and compares the test results to those for different test conditions. The measured static load capacity can be varied depending on the capabilities of the test device used. 2 Normative references There are no normative references in this document. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 thrust runner; runner circular disc connected to the rotating shaft and facing the surface of the top foil Note: The surfaces of the thrust runner should be machined smoothly enough to form the air film between the runner and the top foil. 3.2 take-off stage aimed to secure the distance between the thrust runner (3.1) and the top foil by developing an aerodynamic pressure between them 3.3 clearance shortest distance between the thrust runner (3.1) and the top foil 3.4 bearing torque torque value developed by rotational friction between the thrust runner (3.1) and the top foil Note: The measurement of the bearing torque is as described in 7.3. 3.5 load load capacity weight that can be delivered by a bearing under steady-state conditions 3.6 initial load load (3.5) exerted on the rotating system in the beginning Note: It should be lower than the static load capacity and the load at which the lifetime of the bearing is determined, as explained in 7.4 and 9.2. 3.7 reference load load expected to be supported by a bearing Note: The calculation of the reference load is given in 7.2. 3.8 static load capacity maximum load value of a bearing in static state Note: The measurement of the static load capacity is explained in 7.4. 3.9 friction coefficient flow resistance caused by rotational friction between the thrust runner and the top foil Note: The measurement of the friction coefficient is described in Clause 8. 3.10 lifetime of bearing total number of start-stop test cycles of the foil thrust bearing at which the coating layer disappears Note: The measurement of the lifetime of bearing follows Clause 9. 4 Symbols For the purposes of this document, the following symbols apply. 4.1 Basic characters - Roman alphabet Basic characters - Roman alphabet see Table 1. 4.2 Basic characters - Greek alphabet Basic characters - Greek alphabet see Table 2. 4.3 Additional signs - Subscripts Additional signs - Subscripts see Table 3. 5 Purpose of test The primary purpose of the test is to measure and evaluate the static load capacity, bearing torque, friction coefficients and lifetime of a foil thrust bearing. These are the primary performance metrics of a foil thrust bearing as a mechanical element with specific dimensions. They are closely related to the performance of the mechanical systems in which foil thrust bearings are used. 6 Test conditions 6.1 General The static load capacity of a foil thrust bearing should be tested, after the ambient pressure, temperature and humidity of the environment in which the bearing operates have reached a state of equilibrium.