Hydro-pneumatic spring simulation optimization method and system

Abstract

The invention discloses a hydro-pneumatic spring simulation optimization method and system, and the method and system achieve the precise modeling and optimization of a hydro-pneumatic spring through the joint simulation of Adams and AMESim. According to the method, the limitation of a traditional simulation method in the early-stage design stage of the automobile is overcome, various parameters of the hydro-pneumatic spring can be directly optimized, and the prediction accuracy of the controllability and comfort of the whole automobile is effectively improved. And through a systematic data processing and analysis method and a friendly human-computer interaction interface, the optimization efficiency is further improved. The method and the system are not only suitable for optimization of the hydro-pneumatic spring, but also can be popularized to development of other automobile parts needing multi-domain coupling simulation, and provide powerful tool support for automobile design and development.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile design simulation, and in particular to a method and system for simulating and optimizing an oil-gas spring. Background Art

[0002] In automobile design, the performance of gas springs, as important suspension components, directly affects the handling and comfort of the vehicle. Traditional gas spring simulation methods are mainly based on multi-body dynamics simulation software (such as MSC Adams) to build models and use force models to build springs. This method usually uses a force-displacement curve to represent the spring characteristics, where the slope represents the spring stiffness. For a constant stiffness spring (such as a coil spring), the force-displacement relationship is a straight line; for a variable stiffness spring (such as an air spring or gas spring), the force-displacement relationship is a curve.

[0003] However, this traditional approach has the following disadvantages in the early stages of automotive design:

[0004] 1. The force-displacement curve requires a set of basic data, which is usually obtained through bench testing. However, bench testing cannot be performed before the components are solidified, so the early data can only be based on empirical values.

[0005] 2. Although the required spring curve can be debugged through vehicle performance simulation, it is difficult to accurately achieve this curve target in actual oil-gas spring design.

[0006] These problems make it difficult to accurately simulate the performance of gas springs in the early stages of automobile design, affecting the accuracy of vehicle performance predictions and increasing the workload and cost of subsequent design adjustments. Summary of the invention

[0007] The purpose of the present invention is to provide a gas-oil spring simulation optimization method and system to solve the technical problems existing in the prior art, such as insufficient modeling accuracy, low optimization efficiency, difficulty in balancing vehicle performance, and insufficient forward design capabilities. Through the joint simulation of multi-body dynamics simulation software and hydraulic system simulation software, a gas-oil hydraulic system model that is closer to the actual vehicle is built to realize the forward development and design of gas-oil springs.

[0008] To achieve the above objectives, in a first aspect, the oil-gas spring simulation optimization method designed by the present invention comprises:

[0009] Establish control system template in multi-body dynamics simulation software;

[0010] In the suspension template of the multi-body dynamics simulation software, a point force is used to replace the original spring, and a signal sensor and an actuator are connected;

[0011] Integrate the control system template and the suspension template to establish a multi-body dynamics model of the whole vehicle;

[0012] Build an oil-gas spring hydraulic system in the hydraulic system simulation software and export the interactive file;

[0013] Setting parameters in the multi-body dynamics simulation software for interconnection with the hydraulic system simulation software;

[0014] Perform co-simulation, post-process the resulting data, and optimize the hydro-pneumatic spring solution to achieve vehicle goals.

[0015] In some embodiments of the present invention, the multi-body dynamics simulation software is Adams, and the hydraulic system simulation software is AMESim.

[0016] In some embodiments of the present invention, establishing a control system template in the multi-body dynamics simulation software includes: setting interactive parameters of input and output, wherein the input signal includes a left spring position signal, a left spring movement speed signal, a right spring position signal and a right spring speed signal, and the output signal includes a left spring force and a right spring force.

[0017] In some embodiments of the present invention, point forces are used to replace original springs in the suspension template of the multi-body dynamics simulation software, and signal sensors and actuators are connected, including: creating a new point force to replace the original springs; creating a new signal sensor to measure the displacement and velocity of the left and right springs; establishing a force actuator; and associating the actuator and the point force as an actuator component.

[0018] In some embodiments of the present invention, building an oil-gas spring hydraulic system in the hydraulic system simulation software includes: establishing a passively interconnected oil-gas suspension system, in which the front and rear axles are each interconnected left and right.

[0019] In some embodiments of the present invention, setting parameters in the multi-body dynamics simulation software for interconnection with the hydraulic system simulation software includes: setting parameters to be interacted, simulation step length, and simulation time.

[0020] In some embodiments of the present invention, performing a joint simulation, post-processing the result data, and optimizing the oil-gas spring solution to achieve the whole vehicle target include: setting simulation parameters and performing a steady-state rotation constant radius simulation test; processing the simulation data, paying attention to understeer and body roll gradient indicators; if the indicators do not meet the whole vehicle performance values, modifying the oil-gas spring cylinder diameter, air pressure, gas volume or flow valve arrangement in the hydraulic system simulation software; repeating the joint simulation and result post-processing until all indicators meet the set values.

[0021] In a second aspect, the present invention provides a joint simulation optimization system for an oil-gas spring, comprising:

[0022] Multi-body dynamics simulation module, used to establish control system templates, suspension templates and vehicle multi-body dynamics models;

[0023] Hydraulic system simulation module, used to build oil-gas spring hydraulic system;

[0024] A parameter setting module is used to set the interconnection parameters between the multi-body dynamics simulation module and the hydraulic system simulation module;

[0025] A joint simulation execution module, used for executing joint simulation;

[0026] A data processing module is used for post-processing the simulation result data;

[0027] Optimization module, used to optimize the oil-gas spring solution based on the post-processing results.

[0028] In some embodiments of the present invention, the multi-body dynamics simulation module is Adams software, and the hydraulic system simulation module is AMESim software.

[0029] In some embodiments of the present invention, the multi-body dynamics simulation module further includes: a signal sensor for measuring the displacement and velocity of the left and right springs; and a force actuator for replacing the original spring execution force.

[0030] In some embodiments of the present invention, the hydraulic system simulation module includes: a passively interconnected oil-gas suspension system model, in which the front and rear axles are each interconnected left and right.

[0031] In some embodiments of the present invention, the optimization module is further used to modify the oil-gas spring cylinder diameter, gas pressure, gas volume or flow valve arrangement in the hydraulic system simulation module.

[0032] Beneficial effects of the present invention:

[0033] 1. Through the joint simulation of multi-body dynamics simulation software and hydraulic system simulation software, the problem of accurate modeling of oil-gas suspension is solved and the accuracy of the simulation model is improved.

[0034] 2. It can directly optimize the parameters of the oil and gas spring cylinder diameter, stroke, air pressure, gas volume, flow valve arrangement, etc., to realize the positive development and design of the oil and gas spring.

[0035] 3. It helps to more accurately predict and optimize the handling and comfort of the vehicle in the early stage of automobile design, reducing the workload and cost of later design adjustments.

[0036] 4. A systematic oil-gas spring optimization method is provided to achieve vehicle performance goals quickly and efficiently.

[0037] The present invention realizes accurate modeling and optimization of oil-gas springs through joint simulation of Adams and AMESim. The method of the present invention overcomes the limitations of traditional simulation methods in the early stage of automobile design, can directly optimize various parameters of oil-gas springs, and effectively improves the prediction accuracy of vehicle handling and comfort. The optimization efficiency is further improved through systematic data processing and analysis methods, as well as a friendly human-computer interaction interface. The method and system are not only suitable for the optimization of oil-gas springs, but can also be extended to the development of other automobile components that require multi-domain coupling simulation, providing powerful tool support for automobile design and development. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments disclosed in the present invention, the drawings of the embodiments will be briefly introduced below. These drawings are only used for illustrative purposes and are not intended to limit the protection scope of the present invention.

[0039] Figure 1 It is a schematic flow diagram of the method of the present invention;

[0040] Figure 2 It is a schematic diagram of the Adams control system template of the present invention;

[0041] Figure 3 It is a schematic diagram of the AMESim oil-gas spring hydraulic system of the present invention. DETAILED DESCRIPTION

[0042] The technical solution of the present invention (including the preferred technical solution) is further described in detail below by means of the accompanying drawings and by listing some optional embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Embodiment 1:

[0044] This embodiment provides a joint simulation optimization method for an oil-gas spring, which mainly uses Adams software and AMESim software for joint simulation. The specific steps are as follows:

[0045] Step 1: Create a control system template in Adams

[0046] Open the Adams Mechatronics plug-in and create a new control system template. In this template, set the interactive parameters of input and output: 4 input signals, namely the left spring position signal, the left spring movement speed signal, the right spring position signal and the right spring speed signal; 2 output signals, namely the left spring force and the right spring force. The schematic diagram of the control system template is as follows Figure 2 As shown in the figure, by establishing this control system template, a basic framework is built for the subsequent joint simulation.

[0047] Step 2: Configure the model in the Adams suspension template

[0048] 2.1 Create a new point force to replace the original spring; the purpose of this step is to be able to replace the original simple spring model with the force calculated by AMESim in the future.

[0049] 2.2 Create a new signal sensor under the Mechatronics module to measure the displacement and velocity of the left and right springs. The specific operation is to add a displacement sensor and a velocity sensor at the spring connection point to capture the dynamic characteristics of the spring.

[0050] 2.3 Establish a force actuator under the Mechatronics module; the input of this actuator will come from the calculation results of AMESim and be used to simulate the actual force generated by the oil-gas spring.

[0051] 2.4 Associate the force actuator established in step 2.3 with the point force created in step 2.1 to make it an actual actuator. In this way, the force calculated by AMESim can act on the Adams model through this actuator.

[0052] Step 3: Establish a multi-body dynamics model of the vehicle

[0053] Integrate the control system template in step 1 and the suspension template in step 2 to build a complete multi-body dynamics model of the vehicle. This model includes all relevant components and subsystems such as the vehicle body, suspension system, and steering system.

[0054] Step 4: Build the oil-gas spring hydraulic system in AMESim

[0055] Open AMESim software and build a hydraulic system model of the oil-gas spring. Take a passively interconnected oil-gas suspension as an example. The front and rear axles are interconnected on the left and right. Figure 3 The simulation system shown in Figure 1. The system includes the following main components:

[0056] Oil-gas spring cylinder: simulates the main structure of the oil-gas spring;

[0057] Air chamber: simulates the compression characteristics of gas;

[0058] Hydraulic pipeline: connects various oil and gas springs to achieve interconnection function;

[0059] Throttle valve: controls the flow of hydraulic oil and affects the damping characteristics;

[0060] Check valve: controls the flow direction of hydraulic oil;

[0061] Sensor: measures displacement, velocity, pressure and other parameters.

[0062] After completing the system construction, set the parameters of each component, such as cylinder diameter, air chamber volume, initial air pressure, valve characteristics, etc. Then, export the model as a .dll file to prepare for joint simulation with Adams. Figure 3 shown.

[0063] Step 5: Set parameters in Adams to connect with AMESim

[0064] Set the parameters that need to be interacted, simulation step size, simulation time, etc. Specifically include:

[0065] Return to the Adams model and set the parameters required for co-simulation with AMESim. These parameters include:

[0066] Variables that need to interact: such as spring displacement, velocity (transferred from Adams to AMESim) and spring force (transferred from AMESim to Adams);

[0067] Simulation step size: Make sure the simulation step sizes of Adams and AMESim match. Usually, a smaller step size is selected to ensure calculation accuracy.

[0068] Simulation time: Set the simulation time long enough to cover all the working conditions that need to be analyzed;

[0069] AMESim model file path: Specify the .dll file path exported in step 4.

[0070] Step 6: Perform co-simulation and optimization

[0071] 6.1 Set the simulation parameters and conduct steady-state rotation constant radius simulation test according to the test requirements of Part 10 of the national standard GB / T6323;

[0072] 6.2 Process the simulation data according to Part 10 of the national standard GB / T6323. The main indicators of concern include but are not limited to:

[0073] Understeer: reflects the steering characteristics of the vehicle;

[0074] Roll gradient: reflects the roll degree of the vehicle body during steering;

[0075] Other relevant manipulative indicators.

[0076] 6.3 If any of the above indicators do not meet the vehicle performance requirements, it is necessary to adjust the parameters in the AMESim model. The parameters that can be modified include:

[0077] Oil and gas spring cylinder diameter: affects the mechanical properties of the spring;

[0078] Air pressure: affects the initial stiffness of the spring;

[0079] Gas volume: affects the nonlinear characteristics of the spring;

[0080] Flow valve arrangement: affects the damping characteristics and the interconnection effect between the left and right wheels.

[0081] 6.4 Repeat the joint simulation and result post-processing until all indicators meet the set values.

[0082] Through the above steps, accurate modeling and optimization of the gas spring can be achieved to achieve the handling goals of the entire vehicle.

[0083] Embodiment 2:

[0084] This embodiment provides a joint simulation optimization system for oil and gas springs based on the method of embodiment 1, which mainly includes the following modules:

[0085] 1. Multi-body dynamics simulation module: Adams software is used to establish control system templates, suspension templates and vehicle multi-body dynamics models. The module also includes signal sensors and force actuators, which are used to measure the displacement, velocity and execution force of the spring respectively.

[0086] 2. Hydraulic system simulation module: AMESim software is used to build a hydro-pneumatic spring hydraulic system. This module includes a passively interconnected hydro-pneumatic suspension system model, in which the front and rear axles are interconnected left and right.

[0087] 3. Parameter setting module: used to set the interconnection parameters between Adams and AMESim, including parameters that need to be interacted, simulation step size and simulation time, etc.

[0088] 4. Joint simulation execution module: responsible for executing the joint simulation of Adams and AMESim.

[0089] 5. Data processing module: post-processes the simulation result data, focusing on indicators such as understeer and body roll gradient.

[0090] 6. Optimization module: Based on the data processing results, modify parameters such as the oil and gas spring cylinder diameter, air pressure, gas volume or flow valve arrangement in AMESim to achieve the vehicle performance target.

[0091] The workflow of the system is as follows:

[0092] 1. The user builds a vehicle model in the multi-body dynamics simulation module;

[0093] 2. Build an oil-gas spring hydraulic system in the hydraulic system simulation module;

[0094] 3. Configure the interconnection parameters of the two simulation software through the parameter setting module;

[0095] 4. The joint simulation execution module starts the simulation;

[0096] 5. The data processing module analyzes the simulation results;

[0097] 6. The optimization module adjusts the parameters of the oil and gas spring according to the analysis results;

[0098] 7. Repeat steps 4-6 until the vehicle performance target is achieved.

[0099] Those skilled in the art will readily appreciate that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, replacements, improvements, etc. made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A simulation optimization method for an oil-gas spring, characterized in that: include: Establish control system template in multi-body dynamics simulation software; In the suspension template of the multi-body dynamics simulation software, a point force is used to replace the original spring, and a signal sensor and an actuator are connected; Integrate the control system template and the suspension template to establish a multi-body dynamics model of the whole vehicle; Build an oil-gas spring hydraulic system in the hydraulic system simulation software and export the interactive file; Setting parameters in the multi-body dynamics simulation software for interconnection with the hydraulic system simulation software; Perform co-simulation, post-process the resulting data, and optimize the hydro-pneumatic spring solution to achieve vehicle goals.

2. The oil-gas spring simulation optimization method according to claim 1, characterized in that: Establishing a control system template in the multi-body dynamics simulation software includes: The interactive parameters of input and output are set, wherein the input signals include the left spring position signal, the left spring movement speed signal, the right spring position signal and the right spring speed signal, and the output signals include the left spring force and the right spring force.

3. The oil-gas spring simulation optimization method according to claim 1, characterized in that: In the suspension template of the multi-body dynamics simulation software, point force is used to replace the original spring, and the signal sensor and actuator are connected, including: Create a new point force to replace the original spring; New signal sensors are used to measure the displacement and speed of the left and right springs; Establish force actuators; The actuator and the point force are associated with each other as an actuator.

4. The oil-gas spring simulation optimization method according to claim 1, characterized in that: Building an oil-gas spring hydraulic system in the hydraulic system simulation software includes: A passively interconnected oil-gas suspension system is established, in which the front and rear axles are interconnected left and right.

5. The oil-gas spring simulation optimization method according to claim 1, characterized in that: Setting parameters in the multi-body dynamics simulation software for interconnection with the hydraulic system simulation software includes: setting parameters to be interacted, simulation step length and simulation time.

6. The oil-gas spring simulation optimization method according to claim 1, characterized in that: Perform joint simulation, post-process the result data, and optimize the hydro-pneumatic spring solution to achieve the vehicle objectives including: Set simulation parameters and conduct steady-state rotation constant radius simulation test; Process the simulation data, focusing on understeer and body roll gradient indicators; If the index does not meet the vehicle performance value, modify the oil and gas spring cylinder diameter, gas pressure, gas volume or flow valve arrangement in the hydraulic system simulation software; Repeat the joint simulation and result post-processing until all indicators meet the set values.

7. A joint simulation optimization system for oil and gas springs, characterized in that: include: Multi-body dynamics simulation module, used to establish control system templates, suspension templates and vehicle multi-body dynamics models; Hydraulic system simulation module, used to build oil-gas spring hydraulic system; A parameter setting module is used to set the interconnection parameters between the multi-body dynamics simulation module and the hydraulic system simulation module; A joint simulation execution module, used for executing joint simulation; A data processing module is used for post-processing the simulation result data; Optimization module, used to optimize the oil-gas spring solution based on the post-processing results.

8. The joint simulation optimization system of oil and gas spring according to claim 7 is characterized in that: The multi-body dynamics simulation module also includes: Signal sensor, used to measure the displacement and speed of the left and right springs; Force actuator, used to replace the original spring actuator force.

9. The joint simulation optimization system of oil and gas spring according to claim 7, characterized in that: The hydraulic system simulation module comprises: Model of a passively interconnected hydro-pneumatic suspension system, where the front and rear axles are interconnected left and right.

10. The joint simulation optimization system of oil and gas spring according to claim 7, characterized in that: The optimization module is also used to: Modify the oil and gas spring cylinder diameter, gas pressure, gas volume or flow valve arrangement in the hydraulic system simulation module.

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