Technologies for filtering mechanical resonance with intelligent servo drives

Control machine resonance—the “white noise” generated by machine motion—in servo-driven printing and converting machines. Bosch Rexroth intelligent servo drives provide advanced programming tools, diagnostic features, and integrated filtering capabilities to combat mechanical resonance.

07/19/2012


Figure 2 - White noise test identifies resonant frequency. Using Rexroth’s Drive-Integrated Command Value Generator, apply a noise signal to the torque command input of the motor. Courtesy: Bosch RexrothWith Rexroth IndraDrive intelligent servo drives, the effects of resonance can be overcome without compromising performance or investing additional resources. To illustrate the implementation and benefits of this solution, the Rexroth IndraDrive converter drive can be used to control a synchronous ac motor.

The first step is to identify the resonant frequency by doing a “white noise” test. Using Rexroth’s Drive-Integrated Command Value Generator (Figure 2), a noise signal can be applied to the torque command input of the motor.

While the motor is vibrating, capture one second’s worth of data and upload results to the oscilloscope window in Rexroth’s IndraWorks engineering suite and displayed as a function of time.

In addition to a smoothing time constant (low-pass filter), the IndraDrive offers a host of additional filtering options.

For more about this tutorial, and for Figures 1, 3, 4, 6 and 7, see: Use intelligent servo drives to filter mechanical resonance - linked at the bottom of this article.

Figure 5 - Based on the results from the white noise test, apply the filter with a center frequency of 1075 Hz and a bandwidth of 100 Hz. The default value of 100 Hz usually works well. As soon as the filter is activated, the audible humming is greatly re- Brian Schmidt is senior applications engineer, food, packaging and printing industry sector, Bosch Rexroth Corp. Edited by Mark T. Hoske, content manager CFE Media, Control Engineering and Plant Engineering mhoske@cfemedia.com.

ONLINE

http://www.boschrexroth-us.com 

http://www.youtube.com/BoschRexrothUS  



No comments
The Top Plant program honors outstanding manufacturing facilities in North America. View the 2015 Top Plant.
The Product of the Year program recognizes products newly released in the manufacturing industries.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
Your leaks start here: Take a disciplined approach with your hydraulic system; U.S. presence at Hannover Messe a rousing success
Hannover Messe 2016: Taking hold of the future - Partner Country status spotlights U.S. manufacturing; Honoring manufacturing excellence: The 2015 Product of the Year Winners
Inside IIoT: How technology, strategy can improve your operation; Dry media or web scrubber?; Six steps to design a PM program
Getting to the bottom of subsea repairs: Older pipelines need more attention, and operators need a repair strategy; OTC preview; Offshore production difficult - and crucial
Digital oilfields: Integrated HMI/SCADA systems enable smarter data acquisition; Real-world impact of simulation; Electric actuator technology prospers in production fields
Special report: U.S. natural gas; LNG transport technologies evolve to meet market demand; Understanding new methane regulations; Predictive maintenance for gas pipeline compressors
Warehouse winter comfort: The HTHV solution; Cooling with natural gas; Plastics industry booming
Managing automation upgrades, retrofits; Making technical, business sense; Ensuring network cyber security
Designing generator systems; Using online commissioning tools; Selective coordination best practices

Annual Salary Survey

Before the calendar turned, 2016 already had the makings of a pivotal year for manufacturing, and for the world.

There were the big events for the year, including the United States as Partner Country at Hannover Messe in April and the 2016 International Manufacturing Technology Show in Chicago in September. There's also the matter of the U.S. presidential elections in November, which promise to shape policy in manufacturing for years to come.

But the year started with global economic turmoil, as a slowdown in Chinese manufacturing triggered a worldwide stock hiccup that sent values plummeting. The continued plunge in world oil prices has resulted in a slowdown in exploration and, by extension, the manufacture of exploration equipment.

Read more: 2015 Salary Survey

Maintenance and reliability tips and best practices from the maintenance and reliability coaches at Allied Reliability Group.
The One Voice for Manufacturing blog reports on federal public policy issues impacting the manufacturing sector. One Voice is a joint effort by the National Tooling and Machining...
The Society for Maintenance and Reliability Professionals an organization devoted...
Join this ongoing discussion of machine guarding topics, including solutions assessments, regulatory compliance, gap analysis...
IMS Research, recently acquired by IHS Inc., is a leading independent supplier of market research and consultancy to the global electronics industry.
Maintenance is not optional in manufacturing. It’s a profit center, driving productivity and uptime while reducing overall repair costs.
The Lachance on CMMS blog is about current maintenance topics. Blogger Paul Lachance is president and chief technology officer for Smartware Group.
This article collection contains several articles on the vital role that compressed air plays in manufacturing plants.
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.
This article collection contains several articles on strategic maintenance and understanding all the parts of your plant.
click me