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You searched for subject:(Speed estimation methods). Showing records 1 – 2 of 2 total matches.

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University College Cork

1. Vazquez-Gutierrez, Yeny. Contributions to the modeling of the incremental optical encoder and speed estimation methods for motion control.

Degree: 2019, University College Cork

This work studies the incremental optical encoder sensor and its impact on motor motion. The small-signal model of the sensor combined with the chosen speed estimation method is derived, experimentally validated and compared with existing models. A novel experimental setup emulates the encoder behaviour. Therefore, the sensor is isolated from the rest of the system (motor and driver) that unavoidably biases the dynamic study. The small-signal model demonstrates that the phase lag of the encoder increases as the speed and the resolution decreases. This increment of the delay adversely reduces the phase margin of the motion control-loop. In addition, a simple lead compensator is proposed and implemented on a DSP to recover correct performance of the motor (smooth rotation) previously degraded by the encoder. The coefficients of the proposed lead compensator adapt to the specific commanded speed automatically. As part of this thesis an improvement of the elapsed time (ET) method, that expands the use of this method to all speed ranges, is proposed. The Improved-ET speed estimation method has a good balance between static error and dynamic behaviour. Advisors/Committee Members: Kavanagh, Richard, O'Sullivan, Dara L., Hayes, John G..

Subjects/Keywords: Small-signal modeling; Incremental optical encoder; Speed estimation methods; Motion control

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Vazquez-Gutierrez, Y. (2019). Contributions to the modeling of the incremental optical encoder and speed estimation methods for motion control. (Thesis). University College Cork. Retrieved from http://hdl.handle.net/10468/9530

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Vazquez-Gutierrez, Yeny. “Contributions to the modeling of the incremental optical encoder and speed estimation methods for motion control.” 2019. Thesis, University College Cork. Accessed September 25, 2020. http://hdl.handle.net/10468/9530.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Vazquez-Gutierrez, Yeny. “Contributions to the modeling of the incremental optical encoder and speed estimation methods for motion control.” 2019. Web. 25 Sep 2020.

Vancouver:

Vazquez-Gutierrez Y. Contributions to the modeling of the incremental optical encoder and speed estimation methods for motion control. [Internet] [Thesis]. University College Cork; 2019. [cited 2020 Sep 25]. Available from: http://hdl.handle.net/10468/9530.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Vazquez-Gutierrez Y. Contributions to the modeling of the incremental optical encoder and speed estimation methods for motion control. [Thesis]. University College Cork; 2019. Available from: http://hdl.handle.net/10468/9530

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


University of Florida

2. Modi, Vipul. Comparison of Freeway Capacity Estimation Methods.

Degree: MS, Civil Engineering - Civil and Coastal Engineering, 2009, University of Florida

The capacity of a freeway segment is a critical factor for the assessment of the traffic flow operations on freeway facilities. The Highway Capacity Manual HCM (2000) is considered to be one of the authoritative sources on capacity values for a variety of roadway types in the U.S. It provides a single set of capacity values for basic freeway segments as a function of free-flow speed. These values are considered to be reasonably representative values for freeways located throughout the U.S., but it is recognized that lower or higher values may be more appropriate in any given location. However, the HCM does not provide any guidance on how its recommended values can be adjusted to reflect significant differences in capacity due to local conditions, nor how to directly measure or estimate capacity values. The objective of this research was to investigate various methods that can be used to arrive at an estimate of freeway capacity values, and to recommend one of these methods to the FDOT for use in developing their own estimates of capacity for Florida freeways. Three methods were investigated: one that fits a mathematical function to plotted speed-flow data points, from which the apex of the function is taken as capacity; one that estimates a breakdown probability distribution based on flow rates preceding breakdown events, from which capacity can be taken to correspond to a certain percentile value of the breakdown probability distribution; and one that uses a simple average of a specified percentage of the highest flow rates observed at a site. Based on the various advantages and disadvantages of each of the methods, the following was concluded. The method based on identifying breakdown events is most suitable for the determination of capacity at a site where a detailed operational analysis is desired. For example, at sites where different operational treatments (e.g., ramp metering) are going to be tried in an effort to improve operations and an estimate of capacity that is as accurate as possible is desired. The method based on fitting a mathematical function to speed-flow data is not as suitable as the previous method for detailed evaluations of operational treatments, but is still appropriate for the determination of general capacity estimates. The average maximum flow rate capacity estimation method is most suitable for planning and preliminary engineering applications. ( en ) Advisors/Committee Members: Washburn, Scott S. (committee chair), Elefteriadou, Ageliki L. (committee member).

Subjects/Keywords: Analytical estimating; Estimation methods; Flow velocity; Free flow speeds; Freeways; Photographs; Speed; Time series models; Traffic estimation; Trucks; averaging, basic, capacity, freeway, stochastic, vam; City of Jacksonville ( local )

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Modi, V. (2009). Comparison of Freeway Capacity Estimation Methods. (Masters Thesis). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0025105

Chicago Manual of Style (16th Edition):

Modi, Vipul. “Comparison of Freeway Capacity Estimation Methods.” 2009. Masters Thesis, University of Florida. Accessed September 25, 2020. https://ufdc.ufl.edu/UFE0025105.

MLA Handbook (7th Edition):

Modi, Vipul. “Comparison of Freeway Capacity Estimation Methods.” 2009. Web. 25 Sep 2020.

Vancouver:

Modi V. Comparison of Freeway Capacity Estimation Methods. [Internet] [Masters thesis]. University of Florida; 2009. [cited 2020 Sep 25]. Available from: https://ufdc.ufl.edu/UFE0025105.

Council of Science Editors:

Modi V. Comparison of Freeway Capacity Estimation Methods. [Masters Thesis]. University of Florida; 2009. Available from: https://ufdc.ufl.edu/UFE0025105

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