Designing of sound intensity measuring simulator for bearing tasks

Work is devoted to problems of simulation devices and methods of acoustic measurements. The problem of measuring the sound intensity as one of the most important characteristics of the sound field by using only pressure recievers. According to the algorithm determining the intensity measurement device simulation performed based additive and multiplicative operations. With instrumental laboratory Lab View software model received intensy-metr simulator software and mobile device detection air or underwater noice-radiation objects.

The main reason for using Lab View is that this tool-graphic package, oriented to object programming, essentially provides the construction of an algorithm for the desired procedure for the device to be implemented. At the same time, the user interface is simple and accessible, it is possible to use a wide range of input data and a variety of indicator and recording devices. In this case, the program body in the LabVIEW<sup®environment is created in the form of a graphical diagram reflecting the sequence of mathematical operations that determine the operating principle of the device. Thus, the chain: "mathematical expression - block diagram - program" is practically realized by objects of the program algorithm.

A simulator has been developed that allows not only to measure the intensity of acoustic perturbation of the working medium in true and relative units, but also to ensure the operation of the device for detecting a useful signal against the background of isotropic sound noise represented by white noise. Simulation of the receiving acoustic device was carried out on the basis of a model combining the capabilities of pressure receivers and receivers of oscillation  speed. In this case, the number of pressure receptacles can vary - from two to three. In the topic  there is a variant of the receiving device, consisting of three pressure receptacles.

The resulting software algorithm, formally, contains four groups of device-tools, namely:

• devices for simulating input signals;
• devices for the formation of signals of difference, sum and phase shift;
• filtering devices that provide the formation of a working frequency band and filtering devices that realize the principle of the parity-type spectrum analyzer;
• group of indicators.

The obtained results are proposed to be considered as the initial ones for the creation of simulators of air and underwater sound-direction findinging on the basis of combined receivers.

Ref. 9, fig. 4.