Articles About testing
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As gear efficiency is improved in small steps, it is important to be able to distinguish actual improvements from scatter that can occur while testing. An FZG back-to-back gear test rig was used to investigate how the assembly and re-assembly of the same test setup affects the measurements. A spread in torque loss between one assembly and another of the same test setup were observed. Rig conditions also affected the spread in input torque. With knowledge of how the spread in torque loss varies due to assembly, test results could be distinguished between changes due to assembly and actual differences between tests.
OEMs can minimize the cost of ownership by using highly efficient motors and recognizing when unreliable motors are driving up the operating costs of their applications.
For design engineers and purchasing agents alike, bearings can sometimes be like family. Oh, you know - can't live with 'em, can’t live without 'em.
Following is a presentation of a gear design based upon a theoretically perfect gear technology, for which an overview is offered for consideration. What follows is a report on the design's testing and subsequent manufacture of a hypoid gear pair for a 1999 Ford Mustang.
The growth of worldwide energy consumption and emerging industrial markets demands an increase of renewable energy shares. The price pressure coming from coal, oil, nuclear and natural gas energy - combined with enormous worldwide production capacities for components of wind turbines - make wind energy a highly competitive market. The testing and validation of gearboxes within the test rig and the turbine environment attract a strong focus to the needs of the industry. The following contribution sums up the typical process requirements and provides examples for successful system and component verifications based on field measurements.
Opto 22 Embeds Snap Motion Control subsystem in production equipment to control, monitor and gather operational data.
Large hydraulic cylinders (LHCs) are integral components in the functioning of large machines in mechanically demanding, corrosive and abrasive environments, such as offshore drilling rigs. The materials utilized in these largescale hydraulic systems must deliver reliable performance throughout their expected lifecycle.
Design engineers across industries rely on pillow block bearings for a variety of tough and unconventional applications. Having access to data that backs housing strength performance claims is an integral part of choosing the right bearing to keep operations running optimally. What design considerations must be made when the application demands a pillow block installation on a non-horizontal orientation? What happens when bearing load is not applied through the base of the unit? Timken answers these questions with physical testing, advanced modeling and real-world experience to facilitate the selection of pillow block bearings for specific applications.
Until now the estimation of rolling bearing life has been based on engineering models that consider an equivalent stress, originated beneath the contact surface, that is applied to the stressed volume of the rolling contact. Through the years, fatigue surface–originated failures, resulting from reduced lubrication or contamination, have been incorporated into the estimation of the bearing life by applying a penalty to the overall equivalent stress of the rolling contact. Due to this simplification, the accounting of some specific failure modes originated directly at the surface of the rolling contact can be challenging. In the present article, this issue is addressed by developing a general approach for rolling contact life in which the surfaceoriginated damage is explicitly formulated into the basic fatigue equations of the rolling contact. This is achieved by introducing a function to describe surface-originated failures and coupling it with the traditional, subsurface-originated fatigue risk of the rolling contact. The article presents the fundamental theory of the new model and its general behavior. The ability of the present general method to provide an account for the surface–subsurface competing fatigue mechanisms taking place in rolling bearings is discussed with reference to endurance testing data.
Free vibration and dynamic operation testing of hybrid gears at NASA Glenn Spur Gear Fatigue Test Facility; hybrid gears are compared to their steel counterparts.
End users and OEMs frequently specify "lubed-for-life" mounted bearings, thinking the lubed-for-life bearings will deliver the same life — without lubrication — as bearings that currently require periodic lubrication. The truth is it depends on many factors, and only a detailed review of the application and testing will provide a more accurate answer.
For either brand-new motors or those already in service, "best practices" means that informed technicians can make use of the latest diagnostic techniques (vibration analysis, thermography, shaft-voltage testing, etc.) to prevent electrical bearing damage -- either at the very beginning or very quickly thereafter. If done correctly, the work need only be done once.
Scientists have been hard at work creating a robotic system with the capabilities to sweep and collect garbage in urban environments. This real-world Wall-E is known as the DustBot, aimed at designing, developing, testing and demonstrating a system for improving the management of urban hygiene.
Weiss North America, Inc. of Willoughby, OH has designed and produced rotary tables and other components for the automation industry for more than 45 years. When approached by Alpha Integration, Inc. of Murfreesboro, TN, a manufacturer of turnkey automated assembly, vision and testing systems, to provide a reliable turnkey solution for their 6-foot-tall automotive parts assembly machine, Weiss ‘tiered-up’ an innovative chassis and indexing table system solution.
Many of us have been there; the bearings had the correct preload. You know it, you were there, and you personally saw the measurements. Now, the testing is done and the preload is gone. Not a little gone, not sort of gone - gone, gone. Finger pointing ensues. Suppliers are dragged in by their wrinkly Polo collars. You know the drill. Losing preload in a tapered roller bearing (TRB) system over the life of your application can be a troublesome problem, particularly for gear sets that are prone to noise or severe applications that rely on a very rigid and stable system.
This paper presents an evaluation of measurements being taken on a 750 kW wind turbine gearbox being tested by the National Renewable Energy Laboratory (NREL). High-speed stage gears and bearings have been identified as critical components of the gearbox; during gearbox testing, these components were instrumented and tests were developed to evaluate loads on high-speed tapered roller bearings (TRBs). In this paper an advanced finite element-based contact modeling procedure has been applied to model the high-speed stage with the bearings fully modeled in order to evaluate strain levels. A major conclusion is that the strains of the slotted grooves are at such a level that they have acceptable signal-to-noise levels. This was verified by the results of the initial experiments presented here.
SKF Product Investigation Center Troubleshoots Critical Rotating Equipment Applications with Analysis, Research and Testing Procedures.
News Items About testing
1 MP Tool Chuck Test Stand Provides Automated Durability Testing While Replicating Real-World Scenarios (November 19, 2015)
MP Tool & Engineering’s new chuck test stand with touchscreen monitor provides automated durability and functionality testing w...
2 Newage Testings Microhardness System Contains Multi-Specimen Fixture and Positioning Tables (February 14, 2007)
Newage Testing Instruments' introduced the new model CAMS-MSO multi-specimen microhardness testing system. The system can handle...
3 Napoleon Engineering Services Announces Rolling-Contact Fatigue and Wear Testing (October 10, 2017)
The largest independent bearing testing and inspection facility in the United States, Napoleon Engineering Services (NES) has announced t...
4 Innovative Drivetrain Testing for Wind Turbines Nears Completion (April 11, 2016)
Wind energy researchers have entered the final phase of testing a next-generation drivetrain—made up of the components of a wind tu...
5 Sulzer Doubles High Voltage Testing to Improve Repair Times (January 15, 2018)
Performance testing of high voltage motors and generators is usually carried out to determine benchmark data following a major repair. Ho...
6 2010 Metal Powder Testing and Bearings Standards Released (January 5, 2010)
The 2010 editions of Standard Test Methods for Metal Powders and Powder Metallurgy (PM) Products, and Standard 35, Materials Standards fo...
7 KISSsoft 03/2018 Beta Version is Available for Testing (January 18, 2018)
The KISSsoft 03/2018 Beta Version has now been released for a test run. The final release will be available from April 23rd, 2018 - just ...
8 PCBs Triaxial Force Sensors Designed for Aerospace Vibration Testing (April 18, 2006)
The 261A Series Triaxial Force Link Sensors from the Force/Torque Division of PCB Piezotronics Inc. simultaneously measures dynamic and q...
9 Garland Begins Testing Fleet's First Hydraulic Hybrid Vehicle (October 4, 2010)
The City of Garland, Texas, Environmental Water Services Department, recently began a long-term field test evaluation of the Bosch Rexrot...
10 KISSsoft 03/2017 Beta Version is Available for Testing (February 15, 2017)
The KISSsoft 03/2017 Beta Version has now been released for a test run. The final release will be available April 24th, 2017 - just in ti...
11 HBM Data Recorder Provides Fast Results in Interactive Vehicle Testing (February 12, 2018)
HBM, Inc. recently announced its new SomatXR CX22B-R data recorder, for acquiring and storing measured data in mobile applications such a...
12 Lenze and Digitaltest Collaborate on Motion Controller Testing (March 8, 2016)
Lenze Americas, Uxbridge, MA and Digitaltest, Inc., Concord, CA announced that they have completed a project to provide enhanced automate...
13 Cortec EcoShield 386 Water Based Coating Achieves 1,000 Hours of Salt Spray Testing (July 26, 2016)
Through the Nano VpCI coatings chemistry of Cortec Laboratories, the first water based coating has been created to withstand a minimum 1,...