定义一个简单振动源，由质量m和弹簧刚度为k的杆件组成。 The mass is embedded on a surface with Coulomb friction and is loaded by constant-in-time axial and transverse forces.
定义一个简单振动源，由质量m和弹簧刚度为k的杆件组成。 The mass is embedded on a surface with Coulomb friction and is loaded by constant-in-time axial and transverse forces.
