山下製作所 List of Products and Services

<Spring-type Vibration Isolation Device> Effectively isolates vibrations from structures and machinery using spring components. <Viscoelastic Damper> Viscoelastic dampers reduce vibrations during operation with high damping force. This device allows displacement in all directions of connected equipment while reducing vibrations at any position. It can be applied in all industrial fields, including structures and large machinery, with a simple installation method and high efficiency, but is particularly suitable for areas where displacement needs to be considered, such as complex piping systems. <Tuned Mass Damper (TMD)> Tuned Mass Dampers (TMD) are effective when there is insufficient space for the installation of conventional dampers. TMDs are devices that incorporate mass, springs, and damping mechanisms, functioning by being directly attached to vibrating structures or piping systems. To achieve sufficient effectiveness, TMDs need to be tuned to the natural frequency of the object being protected.

The "Spring Device" is a spring-based vibration isolation device that can be adjusted, manufactured, and delivered to address various types of vibration issues according to specific events. As a specialized manufacturer of vibration countermeasures and anti-vibration equipment, we have a partnership with the German company LISEGA (VICODA), which has a proven track record. We consistently provide solutions for various vibration problems, from vibration measurement and analysis to the supply of anti-vibration equipment. 【Features】 ■ Capable of adjustment, manufacturing, and delivery according to specific events ■ Supports the combined use of spring devices and elastic dampers ■ Reduces unnecessary movements of machinery *For more details, please refer to the PDF document or feel free to contact us.

The "viscoelastic damper" reduces motion in a system and decreases vibrations by converting kinetic energy into heat. It is used to solve various vibration problems and is designed to be effective across a wide frequency range. It is particularly suitable for damping vibrations during the operation of industrial piping systems, such as those in power plants, and for mitigating shock forces generated by large forging hammers. 【Features】 ■ Converts kinetic energy into heat ■ Solves various vibration problems ■ Designed for use across a wide frequency range ■ Can be used in conjunction with spring devices ■ Composed of a metal case filled with a high-viscosity fluid *For more details, please refer to the PDF document or feel free to contact us.

The "elastic material device" is a vibration control and isolation device suitable for preventing vibrations from external excitations in rooms or entire buildings. To achieve effective vibration isolation, the natural frequency of the vibration system defined by the elastic material device and the supporting load is designed to be significantly lower than the main excitation frequency of the vibration source. It can primarily be used for vibration isolation of emergency generators placed on the upper floors of buildings such as hospitals. 【Features】 ■ Natural frequency range from 6 to 20 Hz ■ Always possesses some internal vibration control performance ■ Suitable for vibration isolation of production equipment such as emergency generators and machine tools *For more details, please refer to the PDF materials or feel free to contact us.

The "Tuned Mass Damper" is a vibration control and damping device that is installed on vibrating systems to absorb their energy. It is designed to effectively absorb vibration energy near the natural frequency f0 of the vibrating system. It can be used for vibration control of piping systems that are vibrating due to rotating pumps in power plants and industrial plants. 【Features】 ■ Directly mounted on vibrating systems to effectively absorb energy ■ A device that incorporates mass, springs, and damping mechanisms ■ Standard connection components are available for pipe diameters from 100 to 2000 mm ■ Used in many industries from plant construction to civil engineering *For more details, please refer to the PDF document or feel free to contact us.

The "active vibration control device" is a damping and anti-vibration device that is installed on a vibrating system and operates to counteract the motion of the system. The operation is generated by an actuator based on the acceleration of the reactive mass, which acts as a counterforce to the vibrating system, thereby reducing vibrations. It is suitable for systems that need to reduce vibrations at various frequencies due to different operating conditions of the plant. 【Features】 ■ Developed for vibration control in industrial piping systems ■ Acts as a counterforce to the vibrating system, reducing vibrations ■ Can be directly mounted on piping without joints ■ Utilizes a linear actuator to accelerate the device's reactive mass ■ Control cycle that can easily adapt to changes in plant operating conditions *For more details, please refer to the PDF document or feel free to contact us.

As environmental awareness increases and it becomes clear that severe noise can harm health, effective measures are being sought. In places where traditional heavy and rigid concrete systems cannot be used, the lightweight and flexible CISILENT soundproof wall demonstrates excellent effectiveness. Even in cases with spatial and technical issues, weight restrictions, and other constraints, new possibilities open up both indoors and outdoors. CISILENT efficiently solves noise problems. It features a lightweight structure that can be installed in narrow spaces and is easy to transport. Its simple assembly allows it to be used as a temporary system. The transmission loss of the flexible soundproof wall CISILENT is Rw=25dB, meeting the requirements of the German guidelines for road noise barriers (ZTW-Lsw 88). Moreover, when comparing the weight per unit area, it is significantly lighter than traditional sound barriers. Even if bulk materials have the same mass per unit area as CISILENT, their sound insulation effect is inferior. This is because their high rigidity causes sound to hit the surface and diffuse again. In contrast, the flexible CISILENT exhibits sound insulation effects proportional to its mass.

The Absorbent Mat OIL-EX protects soil and floor surfaces from contamination by harmful substances. It is suitable for temporary or permanent installation in areas where there is a risk of oil leaks. For example, it is recommended for places where machinery maintenance, servicing, repair, and cleaning are conducted. A significant feature is that it can also be laid out in outdoor, unlevelled areas. Characteristics: - Absorption effect is not affected by weather or temperature - Short absorption time - Walkable after absorption; vehicles can pass with restrictions - Absorbed substances are not pushed out or washed away - Usable in unlevelled areas - Easy to handle (installation and cutting) - Perfect for temporary use - Shock absorption effect - Soundproofing and insulation effects