scholarly journals Forensic Engineering Analysis Of Trailer Sway Accidents

2008 ◽  
Vol 25 (1) ◽  
Author(s):  
Mark A.M. Ezra ◽  
Landiss Danel J.
Keyword(s):  
Data Reduction ◽  
Damping Ratio ◽  
Experimental System ◽  
Second Order ◽  
Coupled Systems ◽  
Order System ◽  
System Response ◽  
Statistical Validation ◽  
Response Data ◽  
Data Reduction Method

This Paper Describes A Method For The Reduction Of System Response Data For Second Order Electrical Or Mechanical Systems When That Data Is Available Only In Graphical Format. The Method Of Data Reduction Described Allows Quantitative Evaluation Of Generally Accepted Second Order System Parameters Such As: System Time Constant, Damped Natural Frequency, Damping Ratio, And Exponential Decay Time. The Discussion Includes The Application Of The Described Graphical Technique To Experimental System Response Data Of Coupled Systems, But Whose Experimental Response Approximates That Of An Isolated Second Order System. A Practical Application Of The Described Data Reduction Method Is Covered In Detail. The Described Technique Is Applied To The Analysis Of Data Obtained Experimentally For The Response Of A Tow Vehicle And Trailer System To A Standardized Steering Disturbance. Finally, The Statistical Validation For Experimental System Response Data And The Results Obtained From The Analysis Of Such Data, Using The Described Graphical Method, Is Discussed.

An approximation for the damping ratio zeta in a second-order system

1991 ◽  
Vol 34 (1) ◽  
pp. 145-146 ◽  
Author(s):  
C.L. Phillips ◽  
J.M. Parr
Keyword(s):  
Damping Ratio ◽  
Second Order ◽  
Order System

Analytical Calculation of the Position Loop Gain for Linear Motor CNC Machine Tool

2012 ◽  
Vol 186 ◽  
pp. 182-187 ◽  
Author(s):  
Zoran Pandilov ◽  
Vladimir Dukovski
Keyword(s):  
Machine Tool ◽  
Linear Motor ◽  
Second Order ◽  
Order System ◽  
System Response ◽  
Loop Gain ◽  
Cnc Machine ◽  
Servo Drive ◽  
Simple Method ◽  
Following Error

One of the most important factors which influence on the dynamical behavior of the linear motor servo drives for CNC machine tools is position loop gain or Kv factor. From the magnitude of the Kv-factor depends tracking or following error. In multi-axis contouring the following errors along the different axes may cause form deviations of the machined contours. Generally position loop gain Kv should be high for faster system response and higher accuracy, but the maximum gains allowable are limited due to undesirable oscillatory responses at high gains and low damping factor. Usually Kv factor is experimentally tuned on the already assembled machine tool. This paper presents a simple method for analytically calculation of the position loop gain Kv. A combined digital-analog model of the 4-th order of the position loop is presented. In order to ease the calculation, the 4-th order system is simplified with a second order model. With this approach it is very easy to calculate the Kv factor for necessary position loop damping. The difference of the replacement of the 4-th order system with second order system is presented with the simulation program MATLAB. Analytically calculated Kv factor is function of the nominal angular frequency  and damping D of the linear motor servo drive electrical parts (motor and regulator), as well as sampling period T. :The influence of nonlinearities was taken with the correction factor. Our investigations have proven that experimentally tuned Kv factor differs from analytically calculated Kv factor less than 10%, which is completely acceptable

Transient Responses of Second-Order System

2011 ◽  
Vol 55-57 ◽  
pp. 224-228
Author(s):  
Gao Fei Guo ◽  
Shun Xiang Wu ◽  
Da Cao
Keyword(s):  
Damping Ratio ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Frequency Domain Analysis ◽  
Second Order ◽  
Step Response ◽  
Order System ◽  
Peak Time ◽  
Root Locus ◽  
The Impact

This paper analyses the transient response of second-order system through time domain analysis, root locus and frequency domain analysis, meanwhile, studies the influence exerted to the system by the second-order system damping ratio and the coefficient ratio as well as the research and damping ratio associated with the relevant parameters, like delay time, rise time, peak time, overshoot, time regulation, basing on the unit step response, and the stability of the system is studied by root locus. Finally, graphics are built through the application of Matlab in order to have an intuitive understanding of the impact on the performance of the system.

Discuss about Fast Response Performance of under-Damped Second-Order System in Time Domain

2013 ◽  
Vol 655-657 ◽  
pp. 2202-2206
Author(s):  
Yuan Sheng Wang ◽  
Gui Ying Lu ◽  
Juan Yu ◽  
Bo Li
Keyword(s):  
Time Domain ◽  
Input Signal ◽  
Damping Ratio ◽  
Fast Response ◽  
Second Order ◽  
Order System ◽  
Peak Time ◽  
Response Performance ◽  
The Time Domain ◽  
The Relationship

Influence of the damping ratio on the response fast performance to under-damped second-order system in the time domain has been discussed. The relationship between peak time and the input signal, the adjust time, and the system type has been analyzed. The response’s fast performance indicators are relative, and it is related to the input signal, the response of the system, and the type of system and its initial states. In conclusion, the peak time and the adjust time cannot reach a minimum at the same time. The fast response issue must be discussed in relation to specific cases, and it cannot be generalized.

Frequency response of human soleus muscle

1976 ◽  
Vol 39 (4) ◽  
pp. 788-793 ◽  
Author(s):  
P. Bawa ◽  
R. B. Stein
Keyword(s):  
Frequency Response ◽  
Natural Frequency ◽  
Soleus Muscle ◽  
Damping Ratio ◽  
Low Frequency ◽  
Second Order ◽  
Order System ◽  
Pass Filter ◽  
Stimulus Pulse ◽  
Low Pass Filter

1. The properties of human soleus muscle were studied by systems analysis. Single stimulus pulses and random stimulus pulse trains were applied to a branch of the nerve to soleus muscle and the resultant tension fluctuations were recorded. 2. The frequency-response function between stimulus pulses and tension conforms to that of a second-order, low-pass filter. The parameters of the second-order system, low frequency gain, natural frequency, and damping ratio, varied systematically with the angle of the ankle. As the ankle was flexed (the length of the muscle was increased), the low frequency gain increased, the natural frequency decreased, and the damping ratio was unaffected or increased slightly. 3. These results are discussed in relation to the twitch responses of human soleus muscles and the responses previously observed in cat muscles.

Closeness of the Solutions of Approximately Decoupled Damped Linear Systems to Their Exact Solutions

1992 ◽  
Vol 114 (3) ◽  
pp. 369-374 ◽  
Author(s):  
S. M. Shahruz ◽  
G. Langari
Keyword(s):  
Exact Solution ◽  
Exact Solutions ◽  
Linear Systems ◽  
Equations Of Motion ◽  
Second Order ◽  
Order System ◽  
System Response ◽  
Damping Matrix

The simplest technique of decoupling the normalized equations of motion of a linear nonclassically damped second-order system is to neglect the off-diagonal elements of the normalized damping matrix. In this paper, the error introduced in the system response due to this decoupling technique is studied. Conditions are derived under which the solution of an approximately decoupled system is “close” to the exact solution of the system.

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