System technology of ultrasound (consulting) through sound pressure data analysis.

<The Reality of Cleaning> 1: Managing cleaning equipment and cleaning solutions is difficult. In the case of cleaning devices that utilize vibrational phenomena as a physical action, the low-frequency vibrational phenomena caused by the installation of the device, along with the device's inherent vibrational phenomena, and the vibrational phenomena of the objects being cleaned and tools interact with each other, resulting in a complex change in the vibrational state. In many cases where cleaning effects are observed, nonlinear vibrational phenomena occur. To confirm nonlinearity and manage it, logical learning and an understanding of vibration measurement are necessary. As for the chemical action of cleaning solutions, in devices that utilize cleaning effects, managing the concentration of detergents is important, but measuring the concentration distribution within the tank is a challenging situation. Various distributions change due to interactions with the environment, such as liquid temperature, humidity, air temperature, and atmospheric pressure. In particular, the distribution of dissolved gas concentration has a significant impact on chemical reactions, but no methods are known to achieve uniform dissolved gas concentration. (Using the diffusivity of fine bubbles is one method.) If detergents are added but only increase the variability of the concentration distribution, it will result in greater variability in cleaning results. ....

<<Analysis and Evaluation of Ultrasonic Sound Pressure Data>> 1) Regarding time series data, we will analyze and evaluate the statistical properties of the measurement data (stability and changes of ultrasonic waves) through feedback analysis using a multivariate autoregressive model. 2) The effects of the oscillation part due to ultrasonic oscillation will be analyzed and evaluated in terms of the response characteristics of ultrasonic vibration phenomena concerning the surface condition of the target object through impulse response characteristics and autocorrelation analysis. 3) The interaction between the oscillation and the target object (cleaning items, cleaning solutions, water tanks, etc.) will be evaluated through the analysis of power contribution rates. 4) Regarding the use of ultrasonic waves (cleaning, processing, stirring, etc.), we will analyze and evaluate the dynamic characteristics of ultrasonic waves based on the nonlinear phenomena (results of bispectral analysis) of the target object (propagation of surface elastic waves) or the ultrasonic waves propagating in the target liquid, which are the main factors of the ultrasonic effect. This analysis method is realized based on previous experience and achievements by adapting the dynamic characteristics of complex ultrasonic vibrations to the analysis methods of time series data. The following tool will be used for the analysis: "R," a free statistical processing language and environment.

The Ultrasonic System Research Institute has developed a new component inspection technology using ultrasonic probes, based on its track record of analyzing ultrasonic data that propagates along the surface of target objects. This method applies measurement and analysis techniques for "sound pressure and vibration" based on the ultrasonic characteristics of the ultrasonic probe. We provide consulting and evaluation technology explanations tailored to the development of ultrasonic probes suited to the purpose (vibration modes propagating along the surface of the target object). This is an application of measurement, analysis, and evaluation techniques related to new ultrasonic propagation states. By utilizing the nonlinear phenomena of weak ultrasonic waves propagating along the surface of the target object, in accordance with the acoustic characteristics of the ultrasonic probe, it is possible to detect new features related to the surface condition. In particular, by utilizing multiple combinations regarding the sampling time for sound pressure measurement and the range of analysis frequencies, clear features can be detected. Based on experience and achievements in measuring, analyzing, and evaluating the dynamic characteristics of ultrasonic waves related to surface elastic wave propagation phenomena, we have enabled effective use tailored to the purpose (evaluation) by constructing and modifying logical models through examination.

The Ultrasonic System Research Institute conducts consulting related to the use of ultrasound by applying feedback analysis technology based on multivariate autoregressive models, utilizing a technique for measuring, analyzing, and evaluating the propagation state of ultrasound. By organizing the measurements, analyses, and results obtained using ultrasonic testers in chronological order, we establish and confirm new evaluation criteria (parameters) that indicate the appropriate state of ultrasound for specific purposes. Note: Nonlinear characteristics (dynamic characteristics of acoustic flow), response characteristics, fluctuation characteristics, effects due to interactions, etc. By developing original measurement and analysis methods that consider the acoustic properties of the target object and surface elastic waves, we deepen our understanding of the relationships between various detailed effects related to vibrational phenomena, referencing statistical mathematical concepts. As a result, there is an increasing number of cases demonstrating the effectiveness of new nonlinear parameters related to the propagation state of ultrasound and the surface of the target object, such as changes in bispectrum and changes in autocorrelation. In particular, evaluation cases related to cleaning, processing, and surface treatment effects lead to successful control and improvement based on good confirmations.