Useful Technical Content

There are many sources of vibration in our daily lives, such as walking, traffic, wind, equipment, earthquakes, etc. Various complaints, discomfort, and fear are caused by these vibrations. This section introduces the countermeasures and products that can be selected to deal with these vibration problems in an easy-to-understand manner for each situation.

This page explains the "features, principles, structure, installation examples, effects, etc." of Yacmo's TMDs, which can handle a wide range of vibration from small vibrations caused by walking to large shaking caused by wind and earthquakes. Read this to deepen your understanding of TMDs.

This page introduces the features and installation examples of AMDs, which solve various vibration problems with power in a space-saving manner. We summarize the key points of AMD, which can deal with a wide range of unpleasant vibrations such as walking vibration, equipment-machine vibration, and vertical vibration at live performances, etc.

Features and installation examples of horizontal TMDs that reduce lateral sway from earthquakes, strong winds, and traffic vibrations are introduced.

Features and installation examples of horizontal AMDs that reduce lateral sway from earthquakes, strong winds, traffic vibrations, etc. are introduced.

Frequently asked questions about TMD are summarized in a Q&A format. Please use it as a reference for product selection and countermeasures.

Frequently asked questions about AMD for floor sway countermeasures (for vertical vibration) are summarized here in Q&A format. Please use it as a reference for product selection and countermeasures.

From the background of the need for TMD, the features and principles of TMD are explained with key points. It introduces the Yacmo TMD lineup as well as examples of past actual introductions of TMD measures and their effects.

This technical column introduces the basics and practical examples of vibration countermeasures at workplaces. It explains the types and characteristics of anti-vibration materials and how to proceed with countermeasures, and introduces five specific examples of countermeasures, including forging machines and vibration test equipment.

This section explains the reasons for the swaying of steel-framed structures and summarizes the key points to keep in mind during the design phase to determine how to reduce vibration and ensure livability.

Buildings are required to be not only comfortable but also well designed, but they tend to have long spans, no pillars, and other structures that are prone to vibration. This section introduces measures to reduce vibration while ensuring design quality.

Seismic countermeasures alone may result in large interior shaking that may cause human casualties, or damage that may cause the building to not last long. The following is an easy-to-understand summary of common misconceptions about earthquake resistance and the advantages of combining earthquake resistance and vibration control.

The Occupant Performance Evaluation Guideline is a guideline for evaluating daily vibration in buildings from a "habitability" perspective. The contents of the first edition, the second edition, and the latest edition of the three occupant performance evaluation guidelines are explained, and how to read and use the figures and tables, and the features of each are summarized.

Wind sway can be a problem not only in skyscrapers but also in long, narrow mid-rise buildings that are built on narrow lots in urban areas. This section introduces the causes of wind sway in mid-rise buildings and examples of horizontal TMD installations that are effective as wind sway countermeasures.

In these days of growing interest in the living environment, the various sources of daily vibration that can become complaints are systematically compiled and explained in an easy-to-understand manner.

Increasingly, vibration problems are occurring later due to layout changes, changes in use, and new installation of equipment and machinery. However, the usual vibration control measures would require large-scale construction work. This section introduces the features and installation examples of Yacmo's vibration control system, which enables "after-the-fact" vibration control measures for existing buildings.

TMD is often used as an effective floor sway countermeasure, but it does not work for all types of sway. This section explains the principles of TMD and provides an easy-to-understand explanation.

Vibration of floors and other structures is often a problem due to environmental vibration from walking and production equipment machinery. Countermeasures include structural modifications, vibration isolation, and vibration damping. What are the characteristics of each countermeasure? What are the points to pay attention to? The following is an easy-to-understand explanation of the key points of these measures.

As the environment changes, vibration-related problems are more prevalent than in the past, and there is an increasing need to consider pre- and post-conditioning measures. There are a variety of countermeasures depending on where the source, propagation path, and receiver of the vibration are located. This document introduces vibration reduction technologies at the source, the propagation path, and the receiver, and summarizes the key points in an easy-to-understand manner.

Production equipment and machinery have large excitation forces, and vibration problems often occur with new installations, layout changes, and line expansions. This section provides easy-to-understand explanations of what vibration countermeasures are available for production equipment and machinery, points to keep in mind when implementing countermeasures, and examples of actual improvements.

In recent years, there has been an increase in the number of complexes and tenant buildings that house facilities for various purposes. In particular, the vertical groove vibration of dances and live performances in sports facilities, studios, halls, etc. is often a problem because the vibration is so large that it travels through the building and adversely affects other stores and other facilities. What is vertical groove vibration? What countermeasures are available? This section summarizes actual examples of improvements.

In recent years, more and more commercial facilities, universities, museums, etc. are considering and installing slim steel-frame staircases with high design quality that meet the needs of "blending into the space without feeling oppressive" and "giving a sense of lightness that makes people want to climb up". The slim shape of these staircases makes them prone to swaying and vibration problems. This document summarizes vibration countermeasures for slim steel staircases and introduces methods to reduce vibration without changing the design, along with case studies.

In many cases, vibration caused by walking and fitness, traffic, and production equipment and machinery becomes a problem after building construction is completed and requires countermeasures. This document describes floor sway and vibration control measures, and explains the points to consider in advance and the flow of countermeasures against floor sway. In addition, examples of actual floor shaking diagnosis and improvement effects using the AMD vibration control system are also introduced.

Spacious, open offices with long spans and no pillars are popular, but such long-span structures can cause the floor to sway easily when walking, which can lead to a poor working environment. In this document, we will explain why walking vibration occurs and how to prevent it. How can walking vibration be prevented? What kinds of floors have caused problems? Actual examples of long-span floor vibration countermeasures are explained and introduced in a comprehensive manner.

We sometimes receive such a request from an occupant who is concerned because the building is swaying in the wind. Not only in super high-rise buildings, but surprisingly, it is also common in mid- to high-rise buildings of around 10 floors. This document explains the phenomenon of wind-induced swaying and why it is a problem, with key points.

Vibration problems can seem difficult because they do not show up visibly. How is vibration evaluated? What is occupant performance evaluation? This presentation focuses on the key points so that you can easily gain a basic knowledge of how to evaluate vibration. We hope you will use this guide to understand the evaluation method of vibration and to acquire basic knowledge.

It is difficult to explain vibration phenomena verbally, and actual experience is the most effective way to deepen understanding. Therefore, Yacmo has developed a device that allows the user to experience vibration in vertical and horizontal directions. The device is movable, so it can be used in a variety of locations. This document describes the mechanism of the device and the types of vibration that can be experienced.

Yacmo has organized response acceleration data for 34 buildings and 42 buildings measured by actual walking and small running vibration excitation to date, and summarized the actual floor natural frequencies and walking vibration values of office buildings, the number of people exciters, and the differences in the amplification of walking and small running vibration.

The following is a list of 808 TMD mass masses for vertical vibration that Yacmo has installed to date, sorted by structure and application, for your reference when considering TMD sizes and mass masses.

This report compares the natural frequencies of floors, walkways, and cantilevered floors that Yacmo has measured to date with design values. It is useful to know how much error the calculated values have when designing and considering countermeasures. Please take a look.