NVH Terms | Popular NVH Terminology | NVH Glossary

NVH Terms / NVH (Noise, Vibration and Harshness) Terminology

NVH Terms is a term for the interpretation of vehicle noise, vibration and harshness contributing to varying degrees of discomfort what the people can hear and feel as they drive along, including wind noise, road noise, suspension bumps, engine vibrations..

NVH is the research and alteration of the noise and vibration characteristics of cars and trucks in particular. While it's simple to quantify noise and vibration, but harshness is a subjective attribute and is assessed by "bench" tests, or through analytical instruments that can yield results that match human sensations.

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NVH Terms | NVH Terminology | Popular NVH Glossary List In 21st Century

Pitch

The physical quality of sound that relates to the frequency of the wave.

Pitch – Belt Squeaking creates high frequency – Pitched noise roller bearing makes low frequency

 

Camber

The wheel to the road at the vertical angle. The negative camber implies an inner tilt on top of the wheel and is often used to maximise the cornering power of tire at speed with independent suspension.

Radial Force Variation (RFV)

A measurement of the tire's uniformity, under load, in regards to the variation of the load acting towards the center of the tire; commonly referred to as the tire's sidewall variation.

NVH terms – Lateral run out – Number of disturbances – Vibration order

 

  NVH | Noise Vibration And Harshness | NVH Basics | NVH Analysis | Noise Vibration And Harshness Introduction

Radial Run out – NVH Terms

A condition where a rotating component does not rotate in a true plane. The component moves up and down on its rotational axis.

Resonance

The tendency of a system to respond increasingly to a compelling force oscillating at, or near, the natural frequency of the system. This causes a sudden and large vibration.

Vibration – Compelling force – Beat bead seating – Reliability analysis – Durability analysis

 

Road Noise

A noise that occurs while driving on gravel or roughly paved roads at all vehicle speeds, or when a vehicle is coasting.

Harshness – NVH Harshness – Lack of suspension feel

 

Shake, Lateral

A side-to-side vibration of the body, seats, and steering wheel.

Shake, Vertical

An up and down vibration of the body, seats, and steering wheel.

Vehicle Shake – Steering wheel shake – Vibration in steering wheel – Vertical shake – Lateral shake

 

Shimmy, High-Speed – NVH Terms

A vibration that causes the steering wheel to oscillate when driving on smooth roads at high speeds.

Shimmy, Low-Speed

A vibration that causes the steering wheel to oscillate when driving across a bump at low speeds.

Shimmy steering wheel to oscillate – High speed shimmy – Low speed shimmy due to roughness of road

 

Source Component

The component that is diagnosed as being the root cause of a vibration or noise concern.

Sound – NVH Terms

The result of a vibrating disturbance of an object, which produces waves that transmit out from the source.

Noise – NVH Noise – Types of noise – Unexpected sound

 

Static Balance

The method of balancing a tire and wheel assembly in a single plane. Static balancing removes only the lateral (side to side, wobble) imbalance and the tire and wheel assembly could possibly have a radial (up and down) vibration.

Torque Sensitive Vibration or Noise

A vibration or noise that is sensitive to different loads and torque, applied to the drive train of a vehicle. The vibration or noise changes when the throttle position or transmission gearing is used, during a road test, to change the torque applied to the drive train.

  What Is NVH | NVH Noise | NVH Vibration | NVH Harshness | Noise And Vibration Theory | NVH Basics

Vibration – NVH Terms

The repetitive motion of an object, back and forth or up and down, which may be felt or heard.

Automotive NVH – Brake Squeal – Vehicle NVH – Brake Squeal analysis – Finite element analysis – Vibration analysis

 

Wheel Diameter

The dimension of a wheel measured on the inside of the wheel at the bead seat area.

Opto Electronics | Fiber Optics Technology | Opto electronic Sensors | 6 Types Of Optoelectronics And Its Introduction: What No One Is Talking About

Opto Electronics Devices and its Applications

Optical techniques have always been used for a large number of automotive, metrological and sensing applications. Fiber- and integrated- optics technologies were primarily developed for telecommunication applications. However, the advances in the development of high quality and competitive price opto electronic components and fibers have largely contributed to the expansion of guided wave technology for sensing as well.

Types of Opto Electronic Devices

This post addresses the fundamentals of opto-electronics, with a short photon presentation. In addition various opto electronics instruments, including lamps, LEDs, photodiodes, resistors and laser diodes, will be addressed.

The word optoelectronics is a modern electronics specialization which focuses on light-emitting or light-detecting equipment.

The electromagnetic radiation (i.e., lighting) can be produced by light emitters using voltage and current. These light emitters are also used for lighting purposes or as indicator lights.

Opto Electronics Devices and its electronics applications – Lamps – LED – Photo resistors – Solar cells

In comparison, electromagnetic energy obtained by light detectors is transformed in electric current or voltage, for example by photo transistors. For light sensing and communication, light sensor instruments may be used. Examples include the switches and remote controls that are triggered by the darkness. Lighting detectors are typically used to trigger binding electrons onto the semiconductor material by using photons.

What is Opto Electronics?

Opto electronics – Optics Technology – Opto Electronics Tech systems sensor technology

It is the branch of electronics dealing with devices that generate, transform, transmit, or sense optical, infrared or ultraviolet radiation, as solar cells and lasers.

Opto electronic devices are used to activate or deactivate an electronic circuit based on the intensity of light. Besides this general purpose, opto electronics devices are used in telecommunication, surveillance systems, capturing solar energy etc. Solid state opto electronic components are used as sensors for detecting visible light, Laser Infrared rays, Ultraviolet rays etc.

  Rain Sensors | Light Sensors | Optoelectronic Sensors | Passive Light Sensor

What is Opto Electronic Sensors?

Laser technology – Fiber Optics – Fiber Optics technology – Opto electronics and advanced materials

An opto electronic sensors is a device that is capable of producing an electrical signal that is proportional to the amount of light incident on the active area of the device.

Integrated opto electronic sensors are designed to recognize fundamental stimuli such as patterns, images, motion and intensity and colour.

Opto Electronics materials

Optoelectronics is based on semi-conductive materials in large part. Indirect band gaps like silicone and germanium are normally sufficient, such as in a photodetector, to exploit absorption processes, but are usually less suitable for light emitting. This is a major problem for silicone photonics, but different forms of solutions have been identified.

Nevertheless, emissions devices such as laser diodes are largely based on materials from direct band gaps, particularly III-V form – gallium arsenide and indium phosphide, for example.

Types of Opto electronic Sensors:

Opto electronic Sensor Type	Description
Light to voltage converters	Convert linear output voltage proportional to light intensity
Light to frequency converters	Convert light intensity to digital format for direct connection to microcontroller or Digital signal processor
Ambient light sensors	Measure what the human eye sees
Linear sensor arrays	Measure spatial relationships and light intensity
Colour sensors	RGB filtered sensors for colour discrimination, determination and measurement
Reflective light sensors	Convert reflective light intensity to voltage output

Opto electronic Devices with Applications

Opto-electronics is a connectivity between optics and electronics, involving the research, design and manufacturing of a hardware system that transforms electrical energy into light and light through semiconductors into energy. It consists of solid crystalline materials lighter than metals and heavier than isolation system.

Opto-electronics device is primarily a light-related electronic device. In many opto-electronic applications such as military, telecommunications, automated access control, and medical devices, the system can be identified.

The area of studies encompasses a broad variety of instruments, including LEDs and components, image collectors, displays of information, optical communications systems, optical storages and remote sensing systems, etc. E.g., telecommunication laser, blue laser, optical fibre, LED lamps, photodiodes and solar cells are the examples of optoelectronic equipment.

  Why Is Everyone Talking About Optoelectronics? | 5 Awesome Things You Can Learn From Semiconductor Materials and Semiconductor Devices