trivia
Information and trivia about earthquakes, vibration, and sound.
Evaluation Methods for Environmental Vibration (Vertical) - A Complete Guide
Environmental vibration evaluation is performed by analyzing the acceleration data of vibration recorded by measurement and then comparing it to various evaluation criteria. There are several evaluation criteria and methods, and they are used depending on the application and object.
Fundamentals of Noise Control: Sound Absorption and Sound Insulation - A Complete Guide
The most basic methods of noise control, sound absorption and sound insulation, are explained in an easy-to-understand manner...
What do you do to prevent vibration of machinery? ~Vibration Isolation and Elimination in Factories~.
[Frequency Range Mapping of Vibration and Sound
Earthquake tremors, fitness-related vibration problems, anxious footsteps upstairs, beautiful piano music... these can be categorized by a range of "frequencies"...
Very Basic Knowledge about Vibration - The Meaning and Reference of Vibration Levels
Explains the difference between vibration acceleration levels and vibration levels. Includes a reference table comparing vibration level values to the way the shaking is felt and the conditions inside the building....
Introduction to Vibration Damping (1) - What is vibration control (seismic damping)? Where is it used? ～What is vibration control (seismic damping)?
What is vibration (seismic) control? Vibration and earthquake countermeasures using vibration control technology are used in...
Introduction to Vibration Damping (2) - Vibration Damping (Seismic Damping) is Effective in Such Cases
Life-threatening major earthquakes, uncomfortable floor shaking, noisy noise caused by vibration.... There are many vibration (shaking) problems around us, but in what cases is vibration control (seismic damping) effective?...
Introduction to Vibration Damping (3) - Vibration Damping Devices This and That
There are several types of vibration control devices. Vibration (vibration) dampers, as typified by oil dampers, mass dampers that use the reaction force of weights, and mass dampers are also classified as TMD (Tuned-Mass-Damper) and AMD (Active-Mass-Damper). What are the characteristics of each...
Three patterns of earthquake countermeasures Difference between "seismic resistance," "seismic control," and "seismic isolation
This is an illustration of seismic resistance/seismic control/seismic isolation, a technology to protect valuable items from earthquakes....
Environmental Vibration" such problems and complaints
Environmental vibration" occurs around us on a daily basis. What exactly is environmental vibration? What kind of problems does it cause? And what can we do about it? Let us explain in simple terms...
Very basic knowledge about noise - Meaning and standard of noise level
Explanation of noise levels and A characteristics. There is a reference table comparing noise level values with familiar environments and locations...
What are elastic waves? ~The transmission of sound and vibration~.
The word "elastic waves" always appears in textbooks dealing with vibration and sound. There is an illustrated explanation...
What is airborne and solid propagation sound? What is the difference between them?
I'm having trouble with the noise from the kids in the same apartment..." Is it voices? Or footsteps? The same noise can be divided into two types depending on how it is transmitted, and the countermeasures to deal with it are completely different. Here are some examples to illustrate the difference...
What kind of unit is dB (decibel)?
The dB (decibel) always comes up in vibration and sound issues. It is a unit that we often hear about but are not quite sure what it is. Here is a brief summary...
Wind shakes the building? How to achieve comfortable occupancy?
Many people think of earthquakes as a cause of building swaying, but wind can also cause swaying...
What is Vibration Isolation? Machine vibration should be addressed at the source.
There are a variety of vibration issues that result from vibrations generated by factory machinery. This section describes vibration isolation, an effective countermeasure against machine vibration....
Causes of Vibration - A Complete Guide
All around us, there are various vibrations that adversely affect the comfort and livability of our lives. What causes these vibrations and what are their characteristics?
Difference between "Horizontal Vibration" and "Vertical Vibration" of Buildings - A Complete Guide
The vibrations we feel inside a building can be divided into two main types of shaking. The horizontal (side to side) or vertical (up and down) shaking...
Fundamentals of Vibration and Noise Analysis (2)FFT Analysis - A Complete Guide
Tidbits of Knowledge In the previous article, Basics of Vibration Analysis (1), octave analysis was explained. This time, we summarized FFT analysis, another typical frequency analysis method, in an easy-to-understand manner....
Basics of Vibration and Noise Analysis (1) Octave Analysis - A Complete Guide
Octave analysis is often used to evaluate vibration and sound. What is an octave anyway? What is octave analysis? This presentation will explain in an easy-to-understand manner...
Resonance," a phenomenon that causes increased shaking - a comprehensive guide
Vibrations from walking, traffic, wind, and other factors sometimes cause floors and buildings to shake significantly. This is often caused by a phenomenon called "resonance. Here is a simple explanation of what this phenomenon is...
What kind of sound is solid-state sound (sound of solid propagation)? How does it differ from airborne sound (airborne sound)?
Have you ever heard of the term solid-state sound? It is officially called solid propagation (propagation) sound, but it may not be well known to the general public....