EST1015 Black Snail Horn Dual Voltage 12V / 24VCar Horn Replacement
Universal 510Hz 110DB Dia 90mm 3.7A
Brief details:
voltage: 12/24V
Current:≧3.7A
Sound Level:100-115 DB
Frequency: H:510±20 L:410±20
Dia:90mm
Prevention of resonance:
When the natural frequency of horn stents and mounting support
sheet metal close to or equal to the natural frequency of resonance
phenomenon will occur and thus affect the quality of the horn, can
cause the serious horn can't normal voice.Such as natural frequency
of a car horn stents for 25 hz, and the assembly of the sheet metal
of the installation points of vibration frequency is close to or
equal to 25 hz, horn diaphragm with stent is opposite direction
vibration, the surrounding air vibration or vibration is very
small, can lead to the horn sound or pronunciation.
The calculation of natural vibration frequency of horn bracket and
the equation of particle vibration are as follows:
Axial axial axial axial axial direction in axial direction
The first part is free vibration, because there is damping, the
attenuation is fast, generally not considered.
The second part is forced vibration caused by external forces. The
amplitude is:
B=a/ (axial n - axial direction)
B/Bn=1/[1- (axial/axial n) 2]=1/[1- (f/fn) 2] O (3)
As f/fn goes to 1, B/Bn goes to infinity, which means the amplitude
of the forced vibration increases infinitely, which means the
resonance is generated.
In general, the range of f/fn=0.8-1.2 is called the resonance
region.
Natural frequency: axial n= square root (g/ f) (4)
Where the deformation coefficient: interference f= wl3/2 * 3EJ (5)
Example: mechanical horn with basin shape
The weight of the horn W=0.25kg, the mounting hole spacing of the
shock absorber L=6.2cm, and the elastic modulus E=2 * 106kg/cm2
Section coefficient J=b * h3/12=2.8 * (0.08) 3/12=1.195 * 10-4
The above parameters are put into equations (4) and (5) to obtain:
Omega (g/g f) n =) =) (980/0.0415) = 153.7 fn = n / 2 PI omega =
24.5 Hz
After calculating the natural frequency of the horn bracket, it can
be compared with the natural frequency of the car body.When the two
frequencies are close or equal, the natural frequency of the horn
can be avoided by changing the mounting size of the bracket or the
shape of the bracket.
Precautions: CAE can simulate the amplitude, frequency and
vibration acceleration and frequency curves of the horn bracket and
sheet metal under static conditions.
Through CAE analysis, the natural frequency of the loudspeaker
bracket or the vibration frequency of the mounting point are
calculated.
Balance bracket and sheet metal should be properly selected when
they are fixed by bolts and nuts, and generally verified by CAE
analysis or vibration test.
The strength of the horn mounting bracket and body sheet metal is
determined by CAE analysis or vibration test.
To minimize the complexity of the structure or excessive bending of
the inclined bracket.
Note: at the initial stage of design, the data structure was
preliminarily determined according to the layout status of horn
bracket and sheet metal of mature and competitive models. CAE
analysis was carried out, from the theory
The matching structure of horn bracket and sheet metal is judged,
and the feasibility of the scheme is verified through the test.
Picture:
Shipment Way:
By sea or by air or by courier, seasoned service team,quick answer
and effective work,let you get satisfied purchase experience.
Contact: evershow11@evershowauto.com Marinda Zhang
