挖掘机、盾构机等大型工程机械工作过程中，由于工况复杂、环境多变，其液压系统动力元件大排量柱塞泵相较于常规柱塞泵存在更大的液压冲击，进而引起较大的流量脉动与压力脉动。为降低大排量柱塞泵在挖掘、盾构等工况下的流量、压力脉动，减小油液介质对下游元件的冲击损坏，以及为选择油液介质方法提供理论指导，文中搭建了基于温度场影响的油液动力黏度、密度与体积弹性模量数学模型，在此基础上建立固-液-温耦合作用的柱塞泵数学模型；并使用ADAMS、AMESim软件完成固-液-温耦合作用下750 mL/r柱塞泵联合仿真，得到不同温度影响下柱塞泵流量脉动与压力脉动变化规律；通过整泵试验探究油液温度对柱塞泵压力脉动的影响规律，验证了750 mL/r柱塞泵固-液-温耦合联合仿真模型的正确性。针对油液的3种特性，分别使用正交试验法与单因素分析法考量其对柱塞泵流量脉动率的影响程度和规律。结果表明：柱塞泵出口流量脉动、压力脉动随温度的升高而增大；在设定工况下，油液体积弹性模量对流量脉动率影响占比为97.19%，密度占比为2.03%，动力黏度占比为0.78%；为降低油液特性对柱塞泵出口脉动率的影响，应选择体积弹性模量较大且密度较小的液压油。

In the working process of large-scale construction machinery such as excavators and shield machines, due to the complex working conditions and changeable environment, the hydraulic system power component axial piston pump of large displacement has greater hydraulic impact than the conventional piston pump, and it causes greater flow pulsation and pressure pulsation. In order to reduce the flow and pressure pulsation of axial piston pump of large displacement under excavation, shield and other working conditions, reduce the impact damage of oil medium on downstream components, and provide theoretical guidance for selecting oil medium methods, this paper built a mathematical model of oil dynamic viscosity, density and bulk elastic modulus based on the influence of temperature field. On this basis, a mathematical model of piston pump with solid-liquid-temperature coupling was established. ADAMS and AMESim software were used to complete the joint simulation of 750 mL/r piston pump under the coupling of solid-liquid-temperature, and the variation law of flow pulsation and pressure pulsation of piston pump under different temperature was obtained. The influence of oil temperature on the pressure pulsation of the piston pump was investigated by the whole pump test, and the correctness of the solid-liquid-temperature coupling simulation model of the 750 mL/r piston pump was verified. According to the three characteristics of oil, the orthogonal test method and the single factor analysis method were used to consider their influence degree and influence law on the flow pulsation rate of the piston pump, respectively. The results show that the outlet flow pulsation and pressure pulsation of the piston pump increase with the increase of temperature. Under the set condition, the influence of oil bulk modulus on flow pulsation rate is 97.19%, the density is 2.03%, and the dynamic viscosity is 0.78%. In order to reduce the influence of oil characteristics on the pulsation rate of piston pump outlet, hydraulic oil with larger bulk modulus and smaller density should be selected.