scholarly journals A DIRECT SYNTHESIS CONTROL STRATEGY FOR SINGLE-INPUT, SINGLE-OUTPUT NONLINEAR SYSTEM

2020 ◽  
Author(s):  
Ademola Stanford OLUFEMI
Keyword(s):  
Nonlinear System ◽  
Control Strategy ◽  
Direct Synthesis ◽  
Single Input Single Output ◽  
Single Output ◽  
Single Input

Comparison of single-input single-output and multi-input multi-output control strategies for performing sequential single-axis random vibration control test

2020 ◽  
Vol 26 (21-22) ◽  
pp. 1988-2000
Author(s):  
Giacomo D’Elia ◽  
Emiliano Mucchi
Keyword(s):  
Vibration Control ◽  
Control Strategy ◽  
Control Strategies ◽  
Test Validity ◽  
Output Control ◽  
Single Input Single Output ◽  
Single Output ◽  
Single Input ◽  
Cross Axis ◽  
High Level

This study investigates the use of single-input single-output and multi-input multi-output control strategies for performing single-axis vibration control tests. In particular, the work addresses the problem of high-level cross-axis responses during those tests. To compare the two control strategies, the study presents a test campaign carried out on an automotive component by exploiting two different test facilities: a single-axis shaker and a three-degree-of-freedom shaker table. The analysis points out the limitations of the single-input single-output control strategy. The coupling between the excitation system and the test specimen causes cross-axis excitations that compromise the test validity. In some cases, the cross-axis vibration level even exceeds the acceptable threshold of 14 dB. The multi-input multi-output control strategy instead, besides the feedback control of the main axis, allows the simultaneous vibration control along the two cross axes, thus, improving the quality of the single-axis test. Moreover, the work provides a detailed study followed by practical examples on how to better exploit the evident potential of the multi-input multi-output control strategy for definitely avoiding cross-axis vibration control problems.

Comparative analysis of SISO and wavelength diversity-based FSO systems at different transmitter power levels

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Varun Srivastava ◽  
Abhilash Mandloi ◽  
Dhiraj Kumar Patel
Keyword(s):  
Optical Signal ◽  
Free Space Optical ◽  
Optical Source ◽  
Transmit Power ◽  
Single Input Single Output ◽  
Transmitter Power ◽  
Single Output ◽  
Communication Links ◽  
Single Input ◽  
Matching Performance

AbstractFree space optical (FSO) communication refers to a line of sight technology, which comprises optical source and detector to create a link without the use of physical connections. Similar to other wireless communication links, these are severely affected by losses that emerged due to atmospheric turbulence and lead to deteriorated intensity of the optical signal at the receiver. This impairment can be compensated easily by enhancing the transmitter power. However, increasing the transmitter power has some limitations as per radiation regulations. The requirement of high transmit power can be reduced by employing diversity methods. This paper presents, a wavelength-based diversity method with equal gain combining receiver, an effective technique to provide matching performance to single input single output at a comparatively low transmit power.

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