Slip and wear in multilayer azimuth track systems

Kan, Frank W.; Antebi, Joseph

doi:10.1117/12.556576

Cited by 6 publications

(8 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A comparison between the results for the original mitered track joint with those for the retrofitted track joint (see [1]) showed that the contact stresses at the joint are about 30% less for the retrofitted joint. Fig.…”

Section: Results Of Original Mitered Track Joint and Comparison With mentioning

confidence: 95%

“…As discussed in the previous paper [1], the bolts failed in fatigue due to cyclic stresses resulting from pretension in the bolts and bending of the bolts. Bolt bending is caused by (1) migration of the wear plate relative to the base plate in the longitudinal direction, and (2) transverse rotation of the wear plate as the wheel passes by.…”

Section: IImentioning

confidence: 95%

“…• Apply the vertical wheel load as a load patch, and The details of this model were presented in the previous paper [1]. This model incorporates the weld in the top 3 in.…”

Section: Three Dimensional Models Of Original Mitered Track Joint Andmentioning

confidence: 99%

“…As discussed in the previous paper [1], the behavior of multi-layer azimuth track is largely governed by two phenomena: Hertzian wheel/track contact and compound beam-on-elastic-foundation action. Although analytical solutions are available for Hertzian contact stresses [2] and for beam-on-elastic-foundation [3], non-linear finite element analyses are needed to incorporate the effects of friction and slip at contact surfaces, opening and closing of gaps, actual three dimensional geometry, fasteners, and complexities of track joints…”

Section: Introductionmentioning

confidence: 98%

“…The previous paper [1] described the use of 2D and 3D finite element models of the wheel, track, and foundation capable of representing friction and slip, and the opening and closing of gaps at the interfaces between the wheel, wear plate, * fwkan@sgh.com; phone 1 781 907-9233; fax 1 781 907-9009; http://www.sgh.com base plate, and grout. These models can capture the behavior of the components as the wheel rolls forward.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Update on slip and wear in multi-layer azimuth track systems

2006

Self Cite

View full text Add to dashboard Cite

Many antennas, such as the 100-m Green Bank Telescope, use a wheel-on-track systems in which the track segments consist of wear plates mounted on base plates. The wear plates are typically 2 to 3 inches thick and are case hardened or through hardened. The base plates are usually 3 to 4 times thicker than the wear plates and are not hardened. The wear plates are typically connected to the base plates using bolts. The base plates are supported on grout and anchored to the underlying concrete foundation. For some antennas, slip has been observed between the wear plate and base plate, and between the base plate and the grout, with the migration in the wheel rolling direction. In addition, there has been wear at the wear plate/base plate interface. This paper is an update on the evaluation of GBT track retrofit. The paper describes the use of three-dimensional non-linear finite element analyses to understand and evaluate the behavior of (1) the existing GBT wheel-on-track system with mitered joints, and (2) the various proposed modifications. The modifications include welding of the base plate joints, staggering of the wear plate joints from the base plate joints, changing thickness of the wear plate, and increasing bolt diameter and length. Parameters included in the evaluation were contact pressure, relative slip, wear at the wear plate/base plate interface, and bolt shears and moments.

show abstract

Section: Results Of Original Mitered Track Joint and Comparison With mentioning

confidence: 95%

Section: IImentioning

confidence: 95%

“…• Apply the vertical wheel load as a load patch, and The details of this model were presented in the previous paper [1]. This model incorporates the weld in the top 3 in.…”

Section: Three Dimensional Models Of Original Mitered Track Joint Andmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Update on slip and wear in multi-layer azimuth track systems

2006

Self Cite

View full text Add to dashboard Cite

show abstract

A Method for Damage Detecting of Large Reflector Antennas Wheel-Rail Based on Electromagnetic Ultrasonic Technology

Jin,

Ban,

Feng

2024

IEEE Access

View full text Add to dashboard Cite

The azimuth wheel-rail of large reflector antennas is one of the key components, it not only supports the whole weight of the antenna, but also directly affects the antennas' pointing performance by its surface accuracy. Usually, the whole weight of the large reflector antenna is thousands of tons, its azimuth frame rollers have great contact stress with the wheel-rail surface, repeated rolling can cause rolling contact fatigue on the wheel-rail surface, resulting in wear, cracks and other damage to the wheel-rail, and even lead to failure or fracture of the wheel-rail in serious cases, so it is very important to monitor the damage of the antenna wheel-rail. Current studies are based on Hertzian theory for stress analysis of rollers and wheel-rails, it cannot visually determine the damage. In order to visually detect the usage of antenna wheel-rail surfaces, this paper, for the first time, proposed the method using electromagnetic ultrasonic detection to detect the damage of antenna wheel-rail surface. Based on the principle of electromagnetic ultrasonic nondestructive testing, the simplified wheel-rail model containing wear, corrosion and crack damages are simulated. The results show that this method can effectively detect the surface damage of the antenna wheel-rail surface, and it can provide an important reference for the research of wheel-rail damage detection of large reflector antennas.

show abstract

Research and Analysis of Antenna Wheel-Rail Surface Defect Detection Based on Electromagnetic Ultrasonic Method

Jin

Ban

2022

2022 IEEE 10th Asia-Pacific Conference on Antennas and Propagation (APCAP)

View full text Add to dashboard Cite

Slip and wear in multilayer azimuth track systems

Cited by 6 publications

References 4 publications

Update on slip and wear in multi-layer azimuth track systems

Update on slip and wear in multi-layer azimuth track systems

A Method for Damage Detecting of Large Reflector Antennas Wheel-Rail Based on Electromagnetic Ultrasonic Technology

Research and Analysis of Antenna Wheel-Rail Surface Defect Detection Based on Electromagnetic Ultrasonic Method

Contact Info

Product

Resources

About