System and method of simulating engine energization

Abstract

The invention discloses a system and a method for simulating engine excitation. A master control computer controls a signal generator to output a cylinder pressure signal when a real engine runs, and a power amplifier drives an engine excitation source generating device to simulate the excitation of the real engine. The engine excitation source generating device receives the cylinder pressure signal and generates excitation force to simulate vibration and sound excited by the engine. A 'source-path-response 'model is established, a force vibration transfer function and a force sound transfer function corresponding to the structure are acquired, and an engine transfer path analysis test is performed. On the premise of guaranteeing stable output of excitation source signals required by a test, the structure is greatly simplified, the requirement that the excitation source is convenient to disassemble and assemble is met, excitation simulation of the engine under different working conditions can be achieved, and excitation simulation of other multi-cylinder engines or single-cylinder engines can also be achieved. And partial NVH tests related to the engine can be carried out in a laboratory range.

Description

technical field [0001] The invention relates to the technical field of engine NVH tests, and more particularly, to a system and method for simulating engine excitation. Background technique [0002] The NVH problem of the vehicle mainly comes from the vibration of various structural components of the vehicle. These vibration and noise mainly come from two sources, namely the vehicle excitation source (engine or motor) and system path characteristics. In the process of automotive product development and design, in order to optimize the NVH performance of the whole vehicle, engineers often start from the whole and link the excitation source to reasonably optimize the characteristics of each path. [0003] Taking the engine transfer path analysis test as an example, the most important step is to establish a "source-path-response" model to obtain the corresponding mechanical-vibration transfer function or mechanical-acoustic transfer function, that is, it is necessary to obtain ...

AI Technical Summary

Problems solved by technology

For the laboratory research stage, if the real engine is used as the research object from the beginning, the test cost is high, there are certain requirements for the test site, and the operation process is extremely cumbersome

If it is necessary to disassemble the excitation source, it will not only consume time and energy, but also easily cause damage to the engine components

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