本SAE信息报告介绍了SAE J1574-1的背景和基本原理。机动车行业正在通过使用各种技术预测对道路和操作员输入的响应，努力更全面地了解影响车辆在道路上运动的因素。预测响应的能力是可取的，以便车辆可以设计为最佳的安全性和实用性。除了充气轮胎的力和力矩特性外，许多车辆和悬架参数也会影响车辆的响应；其中包括重量、重心位置、惯性矩、悬架平顺性和侧倾率、悬架运动学和柔顺性以及减震器特性。 为了预测车辆响应，必须对这些参数进行量化。大多数参数的测量仅限于确定其在线性范围内的值，以用于方向控制模拟。线性范围特性的限制主要反映了SAE J1574-1所针对的当前测量实践。对于质量和惯性特性，这一限制显然不适用。对于那些它确实适用的，它不被认为是一个严重的限制，因为大多数测量技术可以通过适当增加转向或悬架位移或负载扩展到线性范围之外。 在模拟中使用测量参数被认为是最频繁的使用。然而，这似乎并不局限于模拟。适用于模拟的车辆和悬架特性同样适用于车辆和悬架特性描述和比较、悬架开发和优化以及道路试验数据处理。如SAE J1574-1所述，所述车辆将仅限于乘用车、轻型卡车以及具有两个或两个以上轮轴且轮距大致相同的公路休闲和商用车辆。这不包括自行车、摩托车、三轮车和主要用于越野的车辆- 公路使用。由于SAE J1574-1的编写是为了记录当前最先进的技术，而不是为了扩展它，因此该限制在很大程度上是对历史上为行驶和方向控制模拟测量的车辆类型的认可。此外，包含这些其他车辆可能需要测量其他底盘特性，以正确模拟其动态特性。这些附加特性的测量可能得不到广泛实验实践的支持。

This SAE Information Report presents the background and rationale for SAE J1574-1.The motor vehicle industry is working toward a more complete understanding of the factors affecting the motions of vehicles on the roadway, by using a variety of techniques that predict responses to road and operator inputs. The capability to predict responses is desirable so that vehicles can be designed for optimum safety and utility. In addition to the force and moment properties of the pneumatic tires, a number of vehicle and suspension parameters affect the response of the vehicle; these include weight, center-of-gravity location, moments of inertia, suspension ride and roll rates, suspension kinematic and compliance properties, and shock absorber characteristics. These parameters must be quantified in order to predict vehicle responses.Measurement of most of these parameters will be limited to determining their values in the linear range for use in directional control simulations. The limitation to linear range characteristics primarily reflects current measurement practice, to which SAE J1574-1 is directed. In the case of mass and inertia properties, this limitation clearly does not apply. For those to which it does apply, it is not felt to be a serious limitation since most of the measurement techniques can be extended beyond the linear range through appropriate increases in steering or suspension displacement or loading. Use of the measured parameters in simulations is assumed as the most frequent use. However, this does not seem to limit their use to simulations. Vehicle and suspension characteristics appropriate for simulation can equally well be used for vehicle and suspension characterization and comparison, suspension development and optimization, and processing of road test data.As noted in SAE J1574-1, vehicles addressed will be limited to passenger cars, light trucks, and on-highway recreational and commercial vehicles with two or more axles of approximately the same wheel track. This excludes bicycles, motorcycles, tricycles, and vehicles intended primarily for off-highway use. This limitation is largely a recognition of the types of vehicles historically measured for ride and directional control simulation, since SAE J1574-1 has been written to document the current state-of-the-art rather than to expand it. Additionally, inclusion of these other vehicles might well require measurement of other chassis characteristics to properly simulate their dynamic characteristics. The measurement of these additional characteristics may not be supported by widespread experimental practice.