New Method Of Compensation Research Articles

The use of technologies for stabilizing the electrophysical characteristics of sensor structures used in the development and manufacture of measuring transducers

The object of the study is the design, manufacturing technology and methods of stabilizing the electrophysical characteristics of measuring transducers. The problem solved in the research is the creation of methods and design and technological solutions to ensure stability used in the development and manufacture of measuring transducers. As a result of the conducted research, designs and technologies for manufacturing and stabilizing the electrophysical characteristics of measuring transducers were developed. The features of the developed designs of measuring transducers are increased in comparison with the known time stability with a basic error of no more than 0.1 %/year. Technologies for stabilizing the parameters of measuring transducers, in contrast to the known ones, differ in their versatility, since most elastic elements that perceive mechanical magnitude are membranes and beams, on which thermocompensating films are easily applied. The stabilization of the parameters of the entire measuring transducer, unlike the known ones, is carried out after the removal of internal mechanical stresses of each element and part of the measuring transducer through the integrated use of current and vibration dynamic loads. Thus, the use of complex compensation due to the application of a new method of compensation of internal mechanical stresses in the structure, based on the use of multilayer film compositions formed on sensitive elements, followed by thermal and vibration stabilization of measuring transducers. In addition, reducing the measurement error and increasing the time and parametric stability of the measuring transducers is achieved through the use of specialized heat treatment modes, training resonant vibration and current loads. When developing structures and stabilization methods, previously developed engineering mathematical models were used, including constructive, informational, dimensional, technological and circuit engineering. At the same time, depending on the adopted design and the technology used, engineering models were modified by including known coefficients and dependencies. This method has significantly reduced the cost and complexity of development

Digital twin based accuracy compensation

A new method for predicting thermal displacements and dynamic characteristics of a machine tool using a digital twin to compensate for accuracy has been developed. The compensation method is based on an accuracy prediction method using model order reduction to reproduce the behavior of machine tools digitally according to their physical characteristics. Additionally, by coupling with the digital twin of dynamics, a comprehensive digital machine tool is generated. Using this model, the compensation of machining accuracy for ambient temperature conditions was validated on the actual machine. As a result, the error in the machining space was successfully compensated. Additionally, the dynamic cutting force was accurately estimated. A new method of compensation for thermal displacement and volumetric accuracy was established, which can visualize the actual machine phenomena in more detail than the conventional compensation of mathematical models by regression, machine learning, and neural networks.

Method of compensation for the mechanical response of connected adaptive cruise control vehicles

A new method of compensation for the vehicle mechanical response in a platoon of identical connected adaptive cruise control (CACC) vehicles is presented. It is assumed that each vehicle wirelessly transmits its desired acceleration to the following vehicle. The velocity of the preceding vehicle and the gap between vehicles is measured by sensors such as radar or lidar. In the absence of sensor delay and communication errors, the new method of compensation yields a transfer function identical to that for instantaneous response. String stability of the platoon is proven, and simulations demonstrate the effectiveness of the approach.

Thermal drift compensation method for microbolometer thermal cameras

We propose a new method of compensation for drifts in thermal cameras using a filter in place of a shutter. The latter method requires periodically closing the camera, thus causing the images to appear frozen frequently. Our technique of replacing the shutter with a filter eliminates this frozen image problem. In this paper we discuss the principles of the new method and present the obtained results.

Linearization of dependence of phase incursion on a distance in case of deviation of phase characteristics of retransmitter channels

There are obtained dependences of phase incursion of retransmitting meter signal, obtained in case of deviations of retransmitter phase characteristics from nominal values. New method of compensation of deviations is supposed for the case of linear law of dependence of phase shift from distance to the controlled object, when it considerably reduces an output error. Replacement of phase shift change is considered taking into account the possibility of processing algorithm modification. It is also shown the necessity of some additions for the input phase shifter circuit.

Compensating for birefringence in cylindrical active elements of solid-body lasers

We discuss a new method of compensation of thermally induced birefringence in cylindrical active elements of solid-body lasers; the method is based on the simultaneous use of two active elements with sign-opposite temperature gradients in the transverse direction. Basic features of the method are shown and schemes of its practical implementation are considered.

Compensation of Tilting and Horizontal Displacement of Upper Die, Relative to the Lower Die, at Out-of-Center Forming Load by a Closed-Loop Control System

This paper presents a new method of compensation, including a closed loop control system for the tilting and horizontal displacement of the ram. At the Institute for Metal Forming at the University of Stuttgart, a floating clamping plate, attached to the ram by hydraulic cylinders, was developed. This clamping plate can be horizontally and vertically positioned by a closed loop control system using proportional valves. By experimental research, done with a hydraulic 4000 kN single acting press, it was shown that compensation of the tilting and horizontal displacement of the upper die relative to the lower die is possible.

Compensation for ohmic drop in the measurement of the potential difference at a liquid/liquid interface by the step current method

A new method of compensation for ohmic drop of the liquid resistance is described for the study of the interface between two immiscible solutions by galvanopotentiometry with linear current scanning.

A New High Accuracy Current Transformer

This paper is presented for the purpose of describing a new method of compensation, by the use of which the ratio and phase-angle errors of current transformers are materially reduced. There are several methods by which the ratio and phase-angle errors of current transformers may be reduced. The following are those which are most commonly used: 1. By changing the number of secondary turns, which reduces ratio errors only. This method is universally used and operates satisfactorily under various conditions of burden, frequency, etc. 2. By the use of a larger number of ampere-turns, a large cross-section of core, or both. An increase in either one of these factors improves the accuracy characteristics of the transformer under the different conditions of burden, frequency, or secondary current. 3. By the use of a high-permeability low-loss steel, which improves the transformer characteristics for moderate values of secondary burdens. The errors increase rapidly under overload conditions. 4. By the use of the two-stage type transformer, which operates satisfactorily under the various conditions of burden and frequency. Slightly special equipment is required, however, for power or energy measurements. 5. By the use of compensating shunts across the primary or secondary windings of the transformer. This method operates satisfactorily only under fixed conditions of burden, frequency, etc. 6. By a new method, in which the secondary turns enclose a section of the magnetic circuit and a short-circuited band encircles the same section.

Abridgment of a new high-accuracy current transformer

This paper is presented for the purpose of describing a new method of compensation, by the use of which the ratio and phase-angle errors of current transformers are materially reduced. There are several similar methods now in use, but these methods possess some undesirable features which are not present in the one described in this paper. By the use of this new method, in which a portion of the secondary turns and an auxiliary short-circuited turn enclose a section of the magnetic circuit, the change in ratio and phase angle between light and full load is considerably reduced, resulting in more nearly approaching a constant ratio, and phase-angle characteristics for all values of load. In view of the demand for meter and transformer combinations which must operate satisfactorily over large ranges of current, this is a desirable feature. The overload characteristics of the current transformer are not injured by the use of this method of reducing the transformer errors. The usual insulation between the primary and secondary can readily be maintained, and the use of this compensating feature does not in any way impair the strength of the transformer to withstand over-current shocks. No changes in the physical dimension of the transformer are required by the application of this compensating method.