Systems and methods for designing MEMS scanning mirrors involving finite element analysis model

Patent metadata

Field	Value
Publication number	US-11263357-B2
Application number	US-202016907655-A
Country	US
Kind code	B2
Filing date	Jun 22, 2020
Priority date	Jun 22, 2020
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

Embodiments of the disclosure provide a design method for a LiDAR scanning mirror. The design method may include receiving, by a communication interface, design parameters of the LiDAR scanning mirror. The design method may further include setting, by at least one processor, an initial value and a step size for each design parameter. The design method may also include adjusting the design parameters according to the respective step sizes. The design method may additionally include computing one or more mirror performance indexes, by the at least one processor, by applying a Finite Element Analysis (FEA) model to the adjusted design parameters. The design method may further include determining that the mirror performance indexes meet a predetermined target performance. The design method may also include providing, by the at least one processor, the adjusted design parameters and the mirror performance indexes for making the LiDAR scanning mirror.

First claim

The invention claimed is:

1. A design method for a LiDAR scanning mirror, comprising:
receiving, by a communication interface, design parameters of the LiDAR scanning mirror;
setting, by at least one processor, an initial value and a step size for each design parameter;
adjusting the design parameters according to the respective step sizes;
computing one or more mirror performance indexes, by the at least one processor, by applying a Finite Element Analysis (FEA) model to the adjusted design parameters;
determining that the mirror performance indexes meet a predetermined target performance; and
providing, by the at least one processor, the adjusted design parameters and the mirror performance indexes for making the LiDAR scanning mirror.

2. The method of claim 1 , wherein computing the mirror performance indexes further comprises:
computing the mirror performance indexes of a baseline design of the LiDAR scanning mirror according to the initial values of the design parameters, using the FEA model.

3. The method of claim 1 , wherein computing the mirror performance indexes further comprises:
approximating the mirror performance indexes using a Taylor series including a plurality of partial derivatives with respect to the design parameters; and
computing the partial derivatives using the FEA model.

4. The method of claim 1 , wherein computing the mirror performance indexes further comprises:
computing a weighted sum of the mirror performance indexes each weighted by a predetermined weight.

5. The method of claim 1 , wherein the initial value is an empiric value provided by a user input through the communication interface.

6. The method of claim 1 , wherein the LiDAR scanning mirror is a MEMS micro-mirror array comprising a plurality of mirrors, link springs configured to link mirrors and anchors, and coupling springs configured to couple mirrors and link springs.

7. The method of claim 1 , wherein the mirror performance indexes comprise at least one of a rotational moment of inertia of the LiDAR scanning mirror, a natural frequency of the mirror, a mirror bow, a maximum stress of the LiDAR scanning mirror, or a mechanical nonlinearity of springs.

8. The method of claim 1 , wherein the design parameters comprise at least one of a thickness of the LiDAR scanning mirror, a dimension of LiDAR scanning mirror, a dimension of the link spring, or a dimension of the coupling spring.

9. The method of claim 1 , further comprising:
providing the mirror performance indexes graphically on a display.

10. A design system for a LiDAR scanning mirror, comprising:
a communication interface configured to receive design parameters of the LiDAR scanning mirror;
at least one processor, configured to:
set an initial value and a step size for each design parameter;
compute one or more mirror performance indexes by applying a Finite Element Analysis (FEA) model to the adjusted design parameters; and
provide the adjusted design parameters and the mirror performance indexes for making the LiDAR scanning mirror.

11. The system of claim 10 , wherein to compute the mirror performance indexes, the at least one processor is further configured to:
compute the mirror performance indexes of a baseline design of the LiDAR scanning mirror according to the initial values of the design parameters, using the FEA model.

12. The system of claim 10 , wherein to compute the mirror performance indexes, the at least one processor is further configured to:
approximate the mirror performance indexes using a Taylor series including a plurality of partial derivatives with respect to the design parameters; and
compute the partial derivatives using the FEA model.

13. The system of claim 10 , wherein to compute the mirror performance indexes, the at least one processor is further configured to:
compute a weighted sum of the mirror performance indexes each weighted by a predetermined weight.

14. The system of claim 10 , wherein the communication interface is further configured to receive an empiric value provided by a user input as the initial value.

15. The system of claim 10 , wherein the LiDAR scanning mirror is a MEMS micro-mirror array comprising a plurality of mirrors, link springs configured to link mirrors and anchors, and coupling springs configured to couple mirrors and link springs.

16. The system of claim 10 , wherein the mirror performance indexes comprise at least one of a rotational moment of inertia of the LiDAR scanning mirror, a natural frequency of the mirror, a mirror bow, a maximum stress of the LiDAR scanning mirror, or a mechanical nonlinearity of springs.

17. The system of claim 10 , wherein the design parameters comprise at least one of a thickness of the LiDAR scanning mirror, a dimension of LiDAR scanning mirror, a dimension of the link spring, or a dimension of the coupling spring.

18. The system of claim 10 , further comprising a display configured to provide the mirror performance indexes graphically.

19. A non-transitory computer-readable medium having stored thereon computer instructions, when executed by at least one processor, configured to perform a design method for a LiDAR scanning mirror, the method comprises:
receiving design parameters of the LiDAR scanning mirror;
setting an initial value and a step size for each design parameter;
computing one or more mirror performance indexes by applying a Finite Element Analysis (FEA) model to the adjusted design parameters; and
providing the adjusted design parameters and the mirror performance indexes for making the LiDAR scanning mirror.

20. The non-transitory computer-readable medium of claim 19 , wherein computing the mirror performance indexes further comprises:
approximating the mirror performance indexes using a Taylor series including a plurality of partial derivatives with respect to the design parameters; and
computing the partial derivatives using the FEA model.

Assignees

• Beijing Voyager Tech Co Ltd
• Beijing Voyoager Tech Co Ltd

Inventors

• Wang Youmin
• Zhou Qin
• Li Gary

Classifications

• G01S7/4817

  relating to scanning · CPC title

• G02B26/105

  with one or more pivoting mirrors or galvano-mirrors (G02B26/101 takes precedence) · CPC title

• G06F30/17

  Mechanical parametric or variational design · CPC title

• G06F30/23 Primary

  using finite element methods [FEM] or finite difference methods [FDM] · CPC title

• G06T17/20

  Finite element generation, e.g. wire-frame surface description, {tesselation} · CPC title