SLAAEP2 January   2026 ULC1001

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Acronyms
  5. 2Introduction
  6. 3Simulation Environment
  7. 4Simulation of Lens
  8. 5Simulation of Piezo Transducer
  9. 6Simulation of Lens Cover System (LCS)
    1. 6.1 Physics and Boundary Conditions
      1. 6.1.1 Glue
      2. 6.1.2 Thin Film
      3. 6.1.3 Housing
    2. 6.2 Results
  10. 7Resources

4 Simulation of Lens

Table 5-4 lists the dimensions of lens.

Table 4-1 Lens Dimensions
Parameters

Unit

Value

Diameter

mm

21

Thickness

mm

1

TI uses CDGM HK9LGT® as the lens material in the LCS-FL-RNG15. The material properties can be found in the Table 5-4.

Table 4-2 Mechanical Properties of Lens

Parameter

Unit

Value

Young’s Modulus

GPa

79.2
Densitykg/m32520
Poisson’s Ratio

1

0.211

Figure 4-1 shows the lens geometry in a 2D axisymmetric view.

Lens GeometryFigure 4-1 Lens Geometry

To simulate a lens, the boundary condition is set as Free. The eigenfrequencies are obtained by running the eigenfrequency study. The result is shown in Table 5-4.

Table 4-3 Eigenfrequencies of Lens

Mode

(0 1)

(0 2)(0 3)(0 4)(0 5)

Frequency (kHz)

20.7

86.7

187.7

312.2

453.9

Figure 4-2 shows the mode shapes of the lens. Red signifies high acceleration while blue indicates low acceleration. In the design, modes (0, 1) and (0, 2) are utilized for effective cleaning since they have fewer nodal circles or dead spots. Also, the modes have lower resonant frequencies and therefore require smaller critical acceleration.

Mode Shapes of LensFigure 4-2 Mode Shapes of Lens