Technical
35 items
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How vibration and noise travel
Sound may travel through air, or be re-radiated by equipment connections, structure and panel vibration. Record the two paths separately first, then decide where to treat.
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Material, component and whole-unit evidence are separate
Material figures, component samples and results for complete machines or entire vessels sit at different levels. Each belongs to its own substrate, temperature and test method, and they do not substitute for one another.
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Compare like for like
Before/after comparison must keep equipment status, load, measurement points and method identical, and record environment and background sound; state any change in conditions.
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How water-based damping coatings work
A water-based damping coating relies on a viscoelastic polymer layer that turns vibration energy into heat, and it also absorbs and blocks some sound.
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Composite loss factor: a measure of damping capacity
The composite loss factor describes how well a material dissipates energy during vibration. A higher value generally means better damping, but it has to be read together with temperature and frequency. This article covers principles and how to read a value only; it contains no calculation procedure and no company data.
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How to evaluate a water-based damping coating
A water-based damping coating can be judged on five points together: damping performance, environmental profile, durability, workability and cost-effectiveness.
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Fire standards and regulations for rail vehicle materials
Damping coatings for rail vehicles are usually assessed against several fire and environmental standards. This article explains what each standard addresses, how editions differ, and what to check once you hold a report; whether a given product complies is stated in that model's technical data and test reports.
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Applying water-based damping coatings by airless spraying
Airless spraying atomises the coating by mechanical pressure alone, with no atomising air added. It suits water-based damping coatings that must be applied over large areas in an even layer. This article covers the principle, pre-spray checks, film control, a troubleshooting path and safe clean-down; equipment settings always follow the product's technical data sheet and the equipment maker's manual.
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Drying requirements of water-based damping coatings and what affects them
Drying is not just a matter of waiting: thickness, temperature, humidity and ventilation together set the drying time of a water-based damping coating and also affect the quality of the final film.
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Ageing evaluation of water-based damping coatings
Ageing tests check whether a coating keeps its adhesion, flexibility and appearance in long service. The usual four are damp heat, hot–cold shock, salt spray and ultraviolet, and each answers a different question.
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Green-design evaluation and water-based damping coatings
T/CNCIA02001-2017 is a technical specification for evaluating the environmental friendliness of water-based architectural coatings. This article explains what it looks at and how to use it when selecting a product.
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How water-based damping coatings reduce vibration and noise: the basics for buildings
A water-based damping coating uses water as its diluent. Once applied it forms a soft, elastic film that absorbs vibration energy through viscoelasticity and also weakens the transmission of sound to some degree.
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Water-based damping coatings on household drain pipes
The rushing and knocking sounds of a drain pipe come from wall vibration caused by the water. A damping layer on the pipe wall absorbs part of that vibration energy and weakens the noise reaching the room.
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Water-based damping coatings on steel industrial platforms: an application note
Steel industrial platforms often face equipment noise, vibration transmission and corrosion at the same time. A water-based damping coating is one option for reducing vibration and noise; its protective effect must be confirmed against the working conditions and test results.
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Improving the lift ride through application-driven refinement
Vibration and noise in a lift car mostly come from the vibration of its metal structure in motion. A water-based damping layer on the inner metal surfaces is one way to make the ride quieter.
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Making lifts more comfortable and quieter
Vibration and noise while a lift runs reduce ride comfort. A uniform damping layer on the side walls is one way to address this.
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Reducing vibration and noise on lift car floors
The car floor passes vibration straight to passengers' feet, and footsteps are made here too, so the floor is part of the ride.
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A quieter, more comfortable lift car: choosing a water-based damping coating
A water-based damping coating consists of water-based resin, fillers and a damping agent. Used inside a lift car it handles noise, vibration and surface protection together.
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Reducing vibration and noise in high-speed train cars with water-based damping coatings
Noise and vibration in a high-speed car come from the drive system, wheel–rail interaction and airflow. A water-based damping coating can go on floors, wall panels, ceilings and similar places to cut vibration transmission and noise.
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Why high-speed rail wants water-based damping coatings
The structural parts of high-speed rail vehicles often use damping coatings to reduce vibration and noise. Environmental and operating requirements are pushing material choice from solvent-based to water-based.
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Aiming at 450 km/h trains: where damping coatings are heading
Higher speed makes vehicle vibration and noise more pronounced and puts higher demands on damping coatings. What follows is the direction the industry expects of the next generation of material, not an existing figure of any one product.
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Noise sources and control inside a high-speed train car
Noise in the car comes from four kinds of source: wheel–rail contact, aerodynamics, onboard equipment and passenger activity. Knowing which is which decides whether to control at the source or to block transmission.
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Why metro vehicles use water-based damping coatings
Damping coatings go on metro vehicles to reduce vibration and noise, raise passenger comfort and protect the vehicle structure.
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Choosing a water-based damping coating for light rail vehicles
Light rail runs flexibly and has a smaller noise and vibration impact, but noise reduction and environmental demands still apply. Damping coatings are used to lower vibration and noise, raise comfort and protect mechanical structures.
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Water-based damping coatings in conventional passenger coaches
Noise and vibration while a coach runs affect passenger comfort, and the cabin is an enclosed space, so harmful-substance content matters too.
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Metro car body noise: main sources and countermeasures
Noise in urban rail vehicles comes from five areas: track vibration, braking, motors, structure-borne transmission and aerodynamics. Noise control is a systems job and has to be considered item by item.
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Track vibration noise of urban rail vehicles: frequency distribution and control
Track vibration noise comes mainly from vibration at the wheel–rail contact and is broadband noise. The frequency distribution has to be understood before it can be treated properly.
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Braking noise of urban rail vehicles: frequency distribution and control
Braking noise comes mainly from contact and friction between wheel and brake when the braking system works, and it is concentrated in the mid-to-high band.
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Motor noise of urban rail vehicles: sources, frequency distribution and control
Motor noise comes mainly from three areas: electromagnetic vibration, bearings and the cooling fan, and its frequency spread is wide.
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Structure-borne noise of urban rail vehicles: sources, frequency distribution and control
Structure-borne noise is vibration that travels through the car-body structure and is then radiated as noise; it is a key part of urban rail vehicle noise.
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Aerodynamic noise of urban rail vehicles: sources, frequency distribution and control
Aerodynamic noise is produced by the interaction of airflow and structure. It is an important part of urban rail vehicle noise and grows with speed.
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Water-based damping coatings in vehicle structure-borne noise control
Noise management bears on ride comfort. A water-based damping coating uses the elastomer formed on drying to dissipate vibration energy and turn structure-borne noise into heat, which reduces airborne noise in the cabin.
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Liquid-applied damping (LASD) and robotic application in the automotive industry
Liquid Applied Sound Deadener (LASD) is a sound-damping product based on water-based coating. Robotic application lets it be placed precisely at each vibration point.
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LASD and robotic application: an efficient route to vehicle noise reduction
Liquid Applied Sound Deadener (LASD) is a liquid sound-damping material designed to remove structure-borne noise. Combined with robotic spraying it can be applied precisely and flexibly.
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Low-frequency structural vibration at 60–100 Hz: limits and verification of damping layers
How 60–100 Hz structural vibration travels, how damping differs from isolation, why an added layer may only move a mode, and how to choose where to treat and verify before and after.
Frequently asked questions
Start from the noise path, material data and verification conditions to learn about samples and technical enquiries.
Which noises should be told apart before choosing a coating?
Sound may travel through the air, or be re-radiated by the vibration of equipment connections, structures and panels. Record the two paths separately first, then decide where to treat.
Can material data stand in for component or whole-machine results?
No. Material data, component samples and whole-machine or whole-vessel results belong to different levels, each tied to its own substrate, temperature and test method, and none can replace another.
How do I compare the effect before and after coating?
Keep the equipment state, load, measuring points and measurement method the same before and after, record the environment and background noise, and state any change in conditions.
Can customers in China request a sample?
Customers in China can request a free 1 kg sample, freight collect, within China only.
Who do I contact for technical questions and for sales questions?
For sales enquiries, email Sales@griwecolor.com.cn; for technical enquiries, email Tech@griwecolor.com.cn.