阅读说明：本技术 一种主动式汽车低频噪音消除装置及其使用方法 (Active automobile low-frequency noise elimination device and application method thereof ) 是由 何成婕 于 2019-08-29 设计创作，主要内容包括：本发明属于汽车技术领域,尤其为一种主动式汽车低频噪音消除装置及其使用方法,包括电源,所述电源连接控制器,所述控制器分别连接噪音抵抗发生器、频谱分析模块,通过设置的一号车轮振动模块、二号车轮振动模块、三号车轮振动模块、四号车轮振动模块、发动机振动模块,可以在控制器的控制下,将单位脉冲响应通过傅里叶变换,求得频率响应,输出信号变成输入信号与系统频率特征单纯的积,这样的时间范围与频率范围的各个系统的输入输出关系和特征,并通过傅里叶变换和傅里叶逆变换进行相互变换,得到具体的消减频率,控制四个车轮与发动机的低频噪音进行振动抵消噪音,通过本检测装置及噪音抵抗发生器可进行检测车体上的噪音。(The invention belongs to the technical field of automobiles, in particular to an active automobile low-frequency noise elimination device and a using method thereof, the device comprises a power supply, the power supply is connected with a controller, the controller is respectively connected with a noise resistance generator and a frequency spectrum analysis module, and through a first wheel vibration module, a second wheel vibration module, a third wheel vibration module, a fourth wheel vibration module and an engine vibration module, the device can obtain frequency response by Fourier transform of unit pulse response under the control of the controller, output signals become simple products of input signals and system frequency characteristics, the input and output relations and characteristics of each system in a time range and a frequency range are transformed with each other through Fourier transform and inverse Fourier transform to obtain specific reduction frequency and control the low-frequency noise of four wheels and an engine to vibrate and offset noise, the noise on the vehicle body can be detected through the detection device and the noise resistance generator.)

1. An active automobile low-frequency noise elimination device and a using method thereof are characterized in that: the power supply is connected with the controller, the controller is respectively connected with the noise resistance generator and the frequency spectrum analysis module, the noise resistance generator comprises a wheel vibration module, a second wheel vibration module, a third wheel vibration module, a fourth wheel vibration module and an engine vibration module, and the frequency spectrum analysis module comprises a sound wave detection module, an acceleration detection module, a gyroscope and an engine rotating speed detection module.

2. The active automobile low-frequency noise elimination device and the use method thereof according to claim 1, characterized in that: the first wheel vibration module, the second wheel vibration module, the third wheel vibration module, the fourth wheel vibration module and the engine vibration module are all composed of a power supply, a motor, an angular velocity sensor and an eccentric wheel.

3. The active automobile low-frequency noise elimination device and the use method thereof according to claim 1, characterized in that: the eccentric wheel is a two-wheel eccentric wheel and is connected with a motor and an angular speed sensor.

4. The active automobile low-frequency noise elimination device and the use method thereof according to claim 1, characterized in that: the sound wave detection module, the acceleration detection module, the gyroscope and the engine rotating speed detection module are integrally detection devices.

5. The active automobile low-frequency noise elimination device and the use method thereof according to claim 1, characterized in that: the method comprises the following steps:

the method comprises the following steps: starting the vehicle, and turning on a switch to start the vehicle;

step two: the detection device comprises a sound wave detection module, an acceleration detection module, a gyroscope and an engine rotating speed detection module, wherein the sound wave detection module, the acceleration detection module, the gyroscope and the engine rotating speed detection module are used for detecting low-frequency noises of four tires and an engine of an automobile;

step three: the detected data controls a first wheel vibration module, a second wheel vibration module, a third wheel vibration module, a fourth wheel vibration module and an engine vibration module through a CPU (central processing unit) to offset noise;

step four: detecting the low-frequency noise in the vehicle again through the sound wave detection module;

step five: analyzing the detection result in the vehicle, and then controlling a first wheel vibration module, a second wheel vibration module, a third wheel vibration module, a fourth wheel vibration module and an engine vibration module to change the vibration frequency and intensity and optimize the noise reduction result;

step six: and repeating the fourth step and the fifth step, optimizing the work, and offsetting the low-frequency noise in the vehicle.

Technical Field

The invention belongs to the technical field of automobiles, and particularly relates to an active automobile low-frequency noise elimination device and a using method thereof.

Background

The reason of the low-frequency noise of the automobile is as follows: 1. the engine car noise problem: the engine of the vehicle is a source of the noise of the vehicle, and the mechanical noise generation of the engine is different along with the difference of the rotating speed of the engine (mainly through a front vane plate, an engine cover, a fire-blocking wall and an exhaust pipe to generate the noise of the vehicle and transmit the noise into a carriage). 2. The noise problem of the road noise automobile is as follows: the road noise is generated by the automobile noise generated by wind cut-in when the automobile runs at high speed and the chassis driven by running, and is also generated by the impact of road sand and stones on the chassis, and is the main source of the road noise (mainly generated by four doors, a trunk, a front fender and a front wheel arc to transfer the automobile noise into a carriage). 3. The noise problem of the tire noise automobile: the tire noise is generated by the friction between tires and a road surface when a vehicle runs at a high speed, the tire noise is determined according to the road condition and the tire pattern, the tire noise is larger when the road condition is worse, and in addition, the tire noise generated by an asphalt road surface and a mud-mixed road surface is greatly different (mainly, the automobile noise generated by four doors, a trunk, a front fender and a front wheel arc is transmitted into a carriage). 4. Wind noise car noise problem: the wind noise is generated when the pressure of the oncoming wind enters the vehicle through the sealing resistance of the vehicle door in the process of high-speed running of the vehicle, and the higher the running speed is, the larger the wind noise is (mainly through the fact that the four-door sealing gap and the vehicle noise generated by the whole thin metal plate are transmitted into the vehicle compartment). 5. Resonance noise and other car noise problems: the vehicle body is like a box body, the sound has the properties of refraction and superposition, and when the sound is transmitted into the vehicle, if the sound is not absorbed and blocked by sound absorption and insulation materials, the noise is continuously refracted and superposed to form resonance sound (mainly generated by the fact that the noise enters the vehicle, is superposed and reflected).

The frequency is read in Hz by using Hz as a unit, and the low-frequency noise means that the frequency range of sound with frequency below 200Hz (octave) to the low-frequency noise in China is defined as 20 ~ 200Hz, wherein the frequency with obvious influence on human body is mainly the frequency range of 3-50 Hz.

In the human ear range, the frequency is 20Hz to 200Hz, the frequency is low-frequency noise, namely, irregular sound is generated by 20 to 200 times of vibration in one second, the frequency is a medium frequency at 500Hz ~ 2kHz, and the high frequency is 2kHz ~ 16 kHz.

The low-frequency noise is mainly divided into structure sound transmission, air sound transmission and standing wave according to the transmission path, and the standing wave is most harmful. The structural sound transmission means that a transformer, a water pump and a central air-conditioning host machine which are arranged in a building transmit sound waves of low-frequency vibration to each household through a girder and a load-bearing beam of a basic structure of a residential building. Airborne sound refers to low frequency noise that is transmitted directly through the air to the residential occupants of a community. The standing wave is formed by multiple reflections of low-frequency noise in the transmission process, the amplitude of the low-frequency noise in an antinode is strongest, and the low-frequency noise has the greatest harm to the health of people. Every automobile is made of metal and plastic plates, and resonance is generated in the driving process, so that a large amount of low-frequency noise is generated. The original automobile factory can also process partial vibration sound sources, but the vibration sound sources are far from enough, so that the high-grade automobiles or the medium-grade and low-grade automobiles are provided with damping materials without installation.

Compared with the prior art the problem that exists:

at present, the interior of the automobile can generate low-frequency noise during working, and the low-frequency noise can have long-term influence on human health.

Disclosure of Invention

To solve the problems set forth in the background art described above. The invention provides an active automobile low-frequency noise elimination device and a use method thereof, and the device has the characteristic of eliminating low-frequency noise.

In order to achieve the purpose, the invention provides the following technical scheme: the active automobile low-frequency noise elimination device comprises a power supply, wherein the power supply is connected with a controller, the controller is respectively connected with a noise resistance generator and a frequency spectrum analysis module, the noise resistance generator comprises a first wheel vibration module, a second wheel vibration module, a third wheel vibration module, a fourth wheel vibration module and an engine vibration module, and the frequency spectrum analysis module comprises a sound wave detection module, an acceleration detection module, a gyroscope and an engine rotation speed detection module.

Preferably, the first wheel vibration module, the second wheel vibration module, the third wheel vibration module, the fourth wheel vibration module and the engine vibration module are all composed of a power supply, a motor, an angular velocity sensor and an eccentric wheel, through the arrangement of a first wheel vibration module, a second wheel vibration module, a third wheel vibration module, a fourth wheel vibration module and an engine vibration module, under the control of the controller, the unit impulse response is processed by Fourier transform to obtain frequency response, the output signal becomes the simple product of the input signal and the system frequency characteristic, the input-output relation and characteristic of each system of the time range and the frequency range, and mutual transformation is carried out through Fourier transformation and Fourier inverse transformation to obtain specific reduction frequency, and low-frequency noise of the four wheels and the engine is controlled to carry out vibration cancellation noise.

Preferably, the eccentric wheel is a two-wheel eccentric wheel and is connected with a motor and an angular velocity sensor, the eccentric wheel drives the eccentric wheel to rotate by turning on a power switch, vibration is generated to offset the sound and vibration energy, and the rotational speed of the eccentric wheel can be measured by the angular velocity sensor, so that the vibration frequency and the vibration intensity can be controlled conveniently.

Preferably, the sound wave detection module, the acceleration detection module, the gyroscope and the engine speed detection module are integrally detection devices, and noise on the vehicle body can be detected through the detection devices and the noise resistance generator.

Preferably, the method comprises the following steps:

the method comprises the following steps: starting the vehicle, and turning on a switch to start the vehicle;

step two: the detection device comprises a sound wave detection module, an acceleration detection module, a gyroscope and an engine rotating speed detection module, wherein the sound wave detection module, the acceleration detection module, the gyroscope and the engine rotating speed detection module are used for detecting low-frequency noises of four tires and an engine of an automobile;

step three: the detected data controls a first wheel vibration module, a second wheel vibration module, a third wheel vibration module, a fourth wheel vibration module and an engine vibration module through a CPU (central processing unit) to offset noise;

step four: detecting the low-frequency noise in the vehicle again through the sound wave detection module;

step five: analyzing the detection result in the vehicle, and then controlling a first wheel vibration module, a second wheel vibration module, a third wheel vibration module, a fourth wheel vibration module and an engine vibration module to change the vibration frequency and intensity and optimize the noise reduction result;

step six: and repeating the fourth step and the fifth step, optimizing the work, and offsetting the low-frequency noise in the vehicle.

Compared with the prior art, the invention has the beneficial effects that: through the first wheel vibration module, the second wheel vibration module, the third wheel vibration module, the fourth wheel vibration module and the engine vibration module, the unit impulse response can be subjected to Fourier transform under the control of the controller to obtain frequency response, the output signal becomes the simple product of the input signal and the system frequency characteristic, the input-output relation and the characteristic of each system in the time range and the frequency range are transformed mutually through Fourier transform and inverse Fourier transform to obtain specific reduction frequency, the four wheels and the low-frequency noise of the engine are controlled to carry out vibration cancellation noise, and the noise on the vehicle body can be detected through the detection device and the noise resistance generator.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of a module structure according to the present invention;

FIG. 2 is a schematic diagram of the flow structure of the present invention;

FIG. 3 is a schematic structural diagram of a noise vibration canceling module according to the present invention;

FIG. 4 is a schematic top view of the eccentric wheel of the present invention;

FIG. 5 is a schematic diagram illustrating the cancellation of the vibration curve of the low frequency noise and vibration module according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.